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APPLICATION NOTES AVAILABLE
AN99 * AN115 * AN120 * AN124 * AN133 * AN134 * AN135
Low Noise/Low Power/2-Wire Bus
X9428
Single Digitally Controlled Potentiometer (XDCPTM)
FEATURES * Solid state potentiometer * 2-wire serial interface * Register oriented format --Direct Read/Write/Transfer Wiper Position --Store as many as Four Positions per Potentiometer * Power supplies --VCC = 2.7V to 5.5V --V+ = 2.7V to 5.5V --V- = -2.7V to -5.5V * Low power CMOS --Standby current < 1A --Ideal for Battery Operated Applications * High reliability --Endurance-100,000 Data Changes per Bit per Register --Register Data Retention-100 years * 4-bytes of nonvolatile memory * 10K Ohm resistor array * Resolution: 64 taps each potentiometer * SOIC and TSSOP packages DESCRIPTION The X9428 integrates a digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated microcircuit. The digitally controlled potentiometer is implemented using 63 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user through the 2-wire bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 nonvolatile Data Registers (DR0:DR3) that can be directly written to and read by the user. The contents of the WCR controls the position of the wiper on the resistor array through the switches. Power up recalls the contents of DR0 to the WCR. The XDCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.
BLOCK DIAGRAM
VCC VSS V+ V- R0 R1 Interface and Control Circuitry Data WP VH/RH
SCL SDA A0 A2 A3
8
R2 R3
Wiper Counter Register (WCR)
VL/RL VW/RW
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PIN DESCRIPTIONS Host Interface Pins Serial Clock (SCL) The SCL input is used to clock data into and out of the X9428. Serial Data (SDA) SDA is a bidirectional pin used to transfer data into and out of the device. It is an open drain output and may be wire-ORed with any number of open drain or open collector outputs. An open drain output requires the use of a pull-up resistor. For selecting typical values, refer to the guidelines for calculating typical values on the bus pull-up resistors graph. Device Address (A0, A2, A3) The Address inputs are used to set the least significant 3 bits of the 8-bit slave address. A match in the slave address serial data stream must be made with the Address input in order to initiate communication with the X9428. A maximum of 8 devices may occupy the 2-wire serial bus. Potentiometer Pins RH/VH, RL/VL The RH/VH and RL/VL inputs are equivalent to the terminal connections on either end of a mechanical potentiometer. RW/VW The wiper outputs are equivalent to the wiper output of a mechanical potentiometer. Hardware Write Protect Input WP The WP pin when low prevents nonvolatile writes to the Data Registers. Analog Supply V+, VThe Analog Supply V+, V- are the supply voltages for the XDCP analog section. PIN NAMES Symbol
SCL SDA A0, A2, A3 RH/VH, VL/RH RW/VW WP V+,VVCC VSS NC Serial clock Serial data Device address Potentiometer Pins (terminal equivalent) Potentiometer Pin (wiper equivalent) Hardware write protection Analog and voltage follower System supply voltage System ground No connection
VCC A2 RL/VL RH/VH RW/VW SDA WP VSS 1 2 3 4 5 6 7 8 X9428
PIN CONFIGURATION
DIP/SOIC 16 15 14 13 12 11 10 9 V+ NC A0 NC A3 SCL NC V-
TSSOP A2 RL RH RW SDA WP VSS 1 2 3 4 5 6 7 X9428 14 13 12 11 10 9 8 VCC V+ A0 NC A3 SCL V-
Description
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PRINCIPLES OF OPERATION The X9428 is a highly integrated microcircuit incorporating a resistor array and its associated registers and counters and the serial interface logic providing direct communication between the host and the XDCP potentiometers. Serial Interface The X9428 supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter and the receiving device as the receiver. The device controlling the transfer is a master and the device being controlled is the slave. The master will always initiate data transfers and provide the clock for both transmit and receive operations. Therefore, the X9428 will be considered a slave device in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW periods (tLOW). SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. Start Condition All commands to the X9428 are preceded by the start condition, which is a HIGH to LOW transition of SDA while SCL is HIGH (tHIGH). The X9428 continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition is met. Stop Condition All communications must be terminated by a stop condition, which is a LOW to HIGH transition of SDA while SCL is HIGH. Acknowledge Acknowledge is a software convention used to provide a positive handshake between the master and slave devices on the bus to indicate the successful receipt of data. The transmitting device, either the master or the slave, will release the SDA bus after transmitting eight bits. The master generates a ninth clock cycle and during this period the receiver pulls the SDA line LOW to acknowledge that it successfully received the eight bits of data. The X9428 will respond with an acknowledge after recognition of a start condition and its slave address and once again after successful receipt of the command byte. If the command is followed by a data byte the X9428 will respond with a final acknowledge. Array Description The X9428 is comprised of a resistor array. The array contains 63 discrete resistive segments that are connected in series. The physical ends of the array are equivalent to the fixed terminals of a mechanical potentiometer (VH/RH and VL/RL inputs). At both ends of the array and between each resistor segment is a CMOS switch connected to the wiper (VW/RW) output. Within each individual array only one switch may be turned on at a time. These switches are controlled by the Wiper Counter Register (WCR). The six bits of the WCR are decoded to select, and enable, one of sixty-four switches. The WCR may be written directly, or it can be changed by transferring the contents of one of four associated Data Registers into the WCR. These Data Registers and the WCR can be read and written by the host system. Device Addressing Following a start condition the master must output the address of the slave it is accessing. The most significant four bits of the slave address are the device type identifier (refer to Figure 1 below). For the X9428 this is fixed as 0101[B]. Figure 1. Slave Address
Device Type Identifier
0
1
0
1
A3
A2
0
A0
Device Address
The next four bits of the slave address are the device address. The physical device address is defined by the state of the A0, A2, A3 inputs. The X9428 compares the serial data stream with the address input state; a successful compare of all four address bits is required for the X9428 to respond with an acknowledge. The A0, A2, A3 inputs can be actively driven by CMOS input signals or tied to VCC or VSS.
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Acknowledge Polling The disabling of the inputs, during the internal nonvolatile write operation, can be used to take advantage of the typical 5ms EEPROM write cycle time. Once the stop condition is issued to indicate the end of the nonvolatile write command the X9428 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the device slave address. If the X9428 is still busy with the write operation no ACK will be returned. If the X9428 has completed the write operation an ACK will be returned, and the master can then proceed with the next operation. Flow 1. ACK Polling Sequence
Nonvolatile Write Command Completed Enter ACK Polling
Figure 2. Instruction Byte Format
Register Select
I3
I2
I1
I0
R1
R0
0
0
Instructions
The four high order bits define the instruction. The next two bits (R1 and R0) select one of the four registers that is to be acted upon when a register oriented instruction is issued. Bits 0 and 1 are defined to be 0. Four of the seven instructions end with the transmission of the instruction byte. The basic sequence is illustrated in Figure 3. These two-byte instructions exchange data between the Wiper Counter Register and one of the Data Registers. A transfer from a Data Register to a Wiper Counter Register is essentially a write to a static RAM. The response of the wiper to this action will be delayed tWRL. A transfer from the Wiper Counter Register (current wiper position), to a Data Register is a write to nonvolatile memory and takes a minimum of tWR to complete. Four instructions require a three-byte sequence to complete. These instructions transfer data between the host and the X9428; either between the host and one of the Data Registers or directly between the host and the Wiper Counter Register. These instructions are: Read Wiper Counter Register (read the current wiper position of the selected pot), write Wiper Counter Register (change current wiper position of the selected pot), read Data Register (read the contents of the selected nonvolatile register) and write Data Register (write a new value to the selected Data Register). The sequence of operations is shown in Figure 4.
Issue START
Issue Slave Address
Issue STOP
ACK Returned? YES
NO
Further Operation? YES Issue Instruction
NO
Issue STOP
Proceed
Proceed
Instruction Structure The next byte sent to the X9428 contains the instruction and register pointer information. The four most significant bits are the instruction. The next four bits point to one of four associated registers. The format is shown below in Figure 2.
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Figure 3. Two-Byte Instruction Sequence
SCL
SDA S T A R T 0 1 0 1 A3 A2 0 A0 A C K I3 I2 I1 I0 R1 R0 0 0 A C K S T O P
The Increment/Decrement command is different from the other commands. Once the command is issued and the X9428 has responded with an acknowledge, the master can clock the selected wiper up and/or down in one segment steps; thereby, providing a fine tuning capability to the host. For each SCL clock pulse (tHIGH) while SDA is HIGH, the selected wiper will Table 1. Instruction Set Instruction
Read Wiper Counter Register Write Wiper Counter Register Read Data Register Write Data Register XFR Data Register to Wiper Counter Register XFR Wiper Counter Register to Data Register Increment/Decrement Wiper Counter Register
Note:
move one resistor segment towards the VH/RH terminal. Similarly, for each SCL clock pulse while SDA is LOW, the selected wiper will move one resistor segment towards the VL/RL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figures 5 and 6 respectively.
I3
1 1 1 1 1 1 0
I2
0 0 0 1 1 1 0
Instruction Set I1 I0 R1 R0
0 1 1 0 0 1 1 1 0 1 0 1 0 0 0 0 0 0
X1
0 0 0 0 0 0 0
X0
0 0 0
Operation
Read the contents of the Wiper Counter Register Write new value to the Wiper Counter Register
1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 0 0
Read the contents of the Data Register pointed to by R1-R0 0 Write new value to the Data Register pointed to by R1-R0 0 Transfer the contents of the Data Register pointed to by R1-R0 to its Wiper Counter Register 0 Transfer the contents of the Wiper Counter Register to the Data Register pointed to by R1-R0 1/0 Enable Increment/decrement of the Wiper Counter Register
(7) 1/0 = data is one or zero
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X9428
Figure 4. Three-Byte Instruction Sequence
SCL SDA S T A R T 0 1 0 1 A3 A2 0 A0 A C K I3 I2 I1 I0 R1 R0 0 0 A C K 0 0 D5 D4 D3 D2 D1 D0 A C K S T O P
Figure 5. Increment/Decrement Instruction Sequence
SCL
SDA S T A R T 0 1 0 1 A3 A2 0 A0 A C K I3 I2 I1 I0
X
X 0 0 A C K I N C 1 I N C 2 I N C n D E C 1 D E C n S T O P
R1 R0
Figure 6. Increment/Decrement Timing Limits
INC/DEC CMD Issued SCL
tWRID
SDA
VW/RW
Voltage Out
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Figure 7. Acknowledge Response from Receiver
SCL from Master
1
8
9
Data Output from Transmitter
Data Output from Receiver START Acknowledge
Figure 8. Detailed Potentiometer Block Diagram
Serial Data Path From Interface Circuitry Register 0 8 Register 1 6
Serial Bus Input C o u n t e r D e c o d e
VH/RH
Parallel Bus Input Wiper Counter Register (WCR)
Register 2
Register 3
If WCR = 00[H] then VW/RW = VL/RL If WCR = 3F[H] then VW/RW = VH/RH
INC/DEC Logic UP/DN Modified SCL UP/DN CLK VL/RL
VW/RW
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X9428
DETAILED OPERATION The potentiometer has a Wiper Counter Register and four Data Registers. A detailed discussion of the register organization and array operation follows. Wiper Counter Register The X9428 contains a Wiper Counter Register. The Wiper Counter Register can be envisioned as a 6-bit parallel and serial load counter with its outputs decoded to select one of sixty-four switches along its resistor array. The contents of the WCR can be altered in four ways: it may be written directly by the host via the write Wiper Counter Register instruction (serial load); it may be written indirectly by transferring the contents of one of four associated Data Registers via the XFR Data Register instruction (parallel load); it can be modified one step at a time by the Increment/ Decrement instruction. Finally, it is loaded with the contents of its Data Register zero (DR0) upon powerup. The WCR is a volatile register; that is, its contents are lost when the X9428 is powered-down. Although the register is automatically loaded with the value in DR0 upon power-up, it should be noted this may be different from the value present at power-down. Data Registers The potentiometer has four nonvolatile Data Registers. These can be read or written directly by the host and data can be transferred between any of the four Data Registers and the Wiper Counter Register. It should be noted all operations changing data in one of these registers is a nonvolatile operation and will take a maximum of 10ms. If the application does not require storage of multiple settings for the potentiometer, these registers can be used as regular memory locations that could possibly store system parameters or user preference data. Register Descriptions Data Registers, (6-Bit), Nonvolatile
D5 NV (MSB) D4 NV D3 NV D2 NV D1 NV D0 NV (LSB)
Four 6-bit Data Registers for each XDCP. (eight 6-bit registers in total). - {D5~D0}: These bits are for general purpose not volatile data storage or for storage of up to four different wiper values. The contents of Data Register 0 are automatically moved to the Wiper Counter Register on power-up. Wiper Counter Register, (6-Bit), Volatile
WP5 V (MSB) WP4 V WP3 V WP2 V WP1 V WP0 V (LSB)
One 6-bit wiper counter register for each XDCP. (Four 6-bit registers in total.) - {D5~D0}: These bits specify the wiper position of the respective XDCP. The Wiper Counter Register is loaded on power-up by the value in Data Register 0. The contents of the WCR can be loaded from any of the other Data Register or directly. The contents of the WCR can be saved in a DR.
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Instruction Format
Notes: (1) (2) (3) (4) (5) "MACK"/"SACK": stands for the acknowledge sent by the master/slave. "A3 ~ A0": stands for the device addresses sent by the master. "X": indicates that it is a "0" for testing purpose but physically it is a "don't care" condition. "I": stands for the increment operation, SDA held high during active SCL phase (high). "D": stands for the decrement operation, SDA held low during active SCL phase (high).
Read Wiper Counter Register (WCR)
S device type device T identifier addresses A R0101AA0A 32 0 T instruction wiper position S S opcode (sent by slave on SDA) A A WWWWWW C C K10010000K00PPPPPP 543210 M A C K S T O P
Write Wiper Counter Register (WCR)
S device type device T identifier addresses A R0101AA0A 32 0 T instruction wiper position S S opcode (sent by master on SDA) A A WWWWWW C C 10100000K00PPPPPP K 543210 S A C K S T O P
Read Data Register (DR)
S device type device T identifier addresses A R0101AA0A 32 0 T instruction register S opcode addresses A C RR K10111000 wiper position/data S (sent by slave on SDA) A WWWWWW C 00PPPPPP K 543210 M A C K S T O P
Write Data Register (DR)
S device type device instruction register S T identifier addresses opcode addresses A A C RR R0101AA0A 1100 00 32 0K 10 T wiper position/data S (sent by master on SDA) A WWWWWW C 00PPPPPP K 543210 S A C K S T HIGH-VOLTAGE O WRITE CYCLE P
XFR Data Register (DR) to Wiper Counter Register (WCR)
S device type device instruction register S T identifier addresses opcode addresses A A AA AC RR R0101 0 1101 00 32 0K 10 T S A C K S T O P
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X9428
XFR Wiper Counter Register (WCR) to Data Register (DR)
S device type device T identifier addresses A R0101AA0A 32 0 T instruction register S opcode addresses A C RR K11101000 S A C K S T O P
HIGH-VOLTAGE WRITE CYCLE
Increment/Decrement Wiper Counter Register (WCR)
S device type device T identifier addresses A R0101AA0A 32 0 T increment/decrement instruction S S opcode (sent by master on SDA) A A C C I/ I/ I/ I/ K00100000KDD. . . .DD S T O P
SYMBOL TABLE
Guidelines for Calculating Typical Values of Bus Pull-Up Resistors
INPUTS Must be steady May change from Low to High May change from High to Low Don't Care: Changes Allowed N/A OUTPUTS Will be steady Will change from Low to High Will change from High to Low Changing: State Not Known Center Line is High Impedance 120 100 Resistance (K) 80 60 40 20 Min. Resistance 0 0 20 40 60 V RMIN = CC MAX =1.8K IOL MIN RMAX = tR CBUS
WAVEFORM
Max. Resistance
80 100 120
Bus Capacitance (pF)
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ABSOLUTE MAXIMUM RATINGS Temperature under bias ....................-65C to +135C Storage temperature .........................-65C to +150C Voltage on SDA, SCL or any address input with respect to VSS .........................-1V to +7V Voltage on V+ (referenced to VSS)......................... 10V Voltage on V- (referenced to VSS)......................... -10V (V+) - (V-).............................................................. 12V Any VH/RH ............................................................... V+ Any VL/RL ................................................................. VLead temperature (soldering, 10 seconds)........ 300C IW (10 seconds)................................................ 12mA
COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS Temperature
Commercial Industrial
Min.
0C -40C
Max.
+70C +85C
Device
X9428 X9428-2.7
Supply Voltage (VCC) Limits
5V 10% 2.7V to 5.5V
ANALOG CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.) Limits Symbol
Power rating IW RW V+ VVTERM Wiper current Wiper resistance Voltage on V+ pin Voltage on V- pin X9428 X9428-2.7 X9428 X9428-2.7 Voltage on any VH/RH or VL/RL pin Noise Resolution (4) Absolute linearity (1) Relative linearity (2) 300 20 10/10/25 Temperature Coefficient of RTOTAL Ratiometric Temperature Coefficient CH/CL/CW Potentiometer Capacitances +4.5 +2.7 -5.5 -5.5 V-140 1.6 1 0.2 150 40
Parameter
End to end resistance tolerance
Min.
Typ.
Max.
20 50 6 250 100 +5.5 +5.5 -4.5 -2.7 V+
Unit
% mW mA V V V dBV % MI(3) MI(3) ppm/C ppm/C pF
Test Conditions
25C, each pot Wiper current = 1mA, VCC = 3V Wiper current = 1mA, VCC = 5V
Ref: 1kHz Vw(n)(actual)--Vw(n)(expected) Vw(n + 1)--[Vw(n) + MI]
See Circuit #3, Spice Macromodel
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D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) Limits Symbol
ICC1 ICC2 ISB ILI ILO VIH VIL VOL
Parameter
VCC supply current (nonvolatile write) VCC supply current (move wiper, write, read) VCC current (standby) Input leakage current Output leakage current Input HIGH voltage Input LOW voltage Output LOW voltage
Min.
Typ.
Max.
1 100 1 10 10
Unit
mA A A A A V V V
Test Conditions
fSCL = 400kHz, SDA = Open, Other Inputs = VSS fSCL = 400kHz, SDA = Open, Other Inputs = VSS SCL = SDA = VCC, Addr. = VSS VIN = VSS to VCC VOUT = VSS to VCC
VCC x 0.7 -0.5
VCC x 0.5 VCC x 0.1 0.4
IOL = 3mA
Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a potentiometer. (2) Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiometer. It is a measure of the error in step size. (3) MI = RTOT/63 or (RH--RL)/63, single pot (4) Max. = all four arrays cascaded together, Typical = individual array resolutions.
ENDURANCE AND DATA RETENTION Parameter
Minimum endurance Data retention
Min.
100,000 100
Unit
Data changes per bit per register Years
CAPACITANCE Symbol
CI/O CIN
(5) (5)
Test
Input/output capacitance (SDA) Input capacitance (A0, A1, A2, A3, and SCL)
Max.
8 6
Unit
pF pF
Test Conditions
VI/O = 0V VIN = 0V
POWER-UP TIMING Symbol
tPUR
(6) (6)
Parameter
Power-up to initiation of read operation Power-up to initiation of write operation VCC Power up ramp rate
Min.
Typ.
Max.
1 5
Unit
ms ms V/msec
tPUW
tRVCC(7)
0.2
50
POWER-UP AND POWER-DOWN There are no restrictions on the power-up or power-down sequencing of the bias supplies VCC, V+, and V- provided that all three supplies reach their final values within 1msec of each other. However, at all times, the voltages on the potentiometer pins must be less than V+ and more than V-. The recall of the wiper position from nonvolatile memory is not in effect until all supplies reach their final value.
Notes: (5) This parameter is periodically sampled and not 100% tested (6) tPUR and tPUW are the delays required from the time the third (last) power supply (VCC, V+ or V-) is stable until the specific instruction can be issued. These parameters are periodically sampled and not 100% tested. (7) Sample tested only. REV 1.1.5 7/8/03
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A.C. TEST CONDITIONS Input pulse levels
Input rise and fall times Input and output timing level VCC x 0.1 to VCC x 0.9 10ns VCC x 0.5
RTOTAL RH CH CW 25pF RW CL 10pF RL
Circuit #3 SPICE Macro Model
EQUIVALENT A.C. LOAD CIRCUIT
10pF 5V 1533 SDA Output 100pF 100pF 2.7V
AC TIMING (over recommended operating conditions) Symbol
fSCL tCYC tHIGH tLOW tSU:STA tHD:STA tSU:STO tSU:DAT tHD:DAT tR tF tAA tDH TI tBUF tSU:WPA tHD:WPA Clock frequency Clock cycle time Clock high time Clock low time Start setup time Start hold time Stop setup time SDA data input setup time SDA data input hold time SCL and SDA rise time SCL and SDA fall time SCL low to SDA data output valid time SDA data output hold time Noise suppression time constant at SCL and SDA inputs Bus free time (prior to any transmission) WP, A0, A1, A2 and A3 setup time WP, A0, A1, A2 and A3 hold time 50 50 1300 0 0
Parameter
Min.
100 2500 600 1300 600 600 600 100 30
Max.
400
Unit
kHz ns ns ns ns ns ns ns ns
300 300 900
ns ns ns ns ns ns ns ns
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HIGH-VOLTAGE WRITE CYCLE TIMING Symbol
tWR
Parameter
High-voltage write cycle time (store instructions)
Typ.
5
Max.
10
Unit
ms
XDCP TIMING Symbol
tWRPO tWRL tWRID
Note:
Parameter
Wiper response time after the third (last) power supply is stable Wiper response time after instruction issued (all load instructions) Wiper response time from an active SCL/SCK edge (increment/decrement instruction)
Min.
Max.
10 10 10
Unit
s s s
(8) A device must internally provide a hold time of at least 300ns for the SDA signal in order to bridge the undefined region of the falling edge of SCL.
TIMING DIAGRAMS START and STOP Timing
(START) tR SCL tSU:STA tHD:STA tR SDA tF tSU:STO tF (STOP)
Input Timing
tCYC SCL tLOW SDA tSU:DAT tHD:DAT tBUF tHIGH
Output Timing
SCL
SDA tAA tDH
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X9428
XDCP Timing (for All Load Instructions)
(STOP) SCL
SDA
LSB tWRL
VW/RW
XDCP Timing (for Increment/Decrement Instruction)
SCL
SDA
Wiper Register Address
Inc/Dec tWRID
Inc/Dec
VW/RW
Write Protect and Device Address Pins Timing
(START) SCL (STOP)
...
(Any Instruction)
...
SDA tSU:WPA WP A0, A2, A3
...
tHD:WPA
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X9428
APPLICATIONS INFORMATION Basic Configurations of Electronic Potentiometers
VR +VR
VW/RW
I Three terminal Potentiometer; Variable voltage divider
Two terminal Variable Resistor; Variable current
Application Circuits
Noninverting Amplifier VS + - VO VIN 317 R1 R2 R1 VO (REG) Voltage Regulator
Iadj R2
VO = (1+R2/R1)VS
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
Offset Voltage Adjustment
Comparator with Hysteresis
R1 VS 100K - +
R2
VS
- + VO
VO
}
}
TL072 10K 10K +12V 10K -12V
R1
R2
VUL = {R1/(R1+R2)} VO(max) VLL = {R1/(R1+R2)} VO(min)
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Application Circuits (continued)
Attenuator C VS R1 - VS R3 R4 All RS = 10k + VO R2 R
Filter
+ - VO
R2 R1
VO = G VS -1/2 G +1/2
GO = 1 + R2/R1 fc = 1/(2pRC)
Inverting Amplifier R1 R2
Equivalent L-R Circuit
}
VS
}
- + VO
C1 VS
R2 + -
VO = G VS G = - R2/R1
ZIN
R1 R3
ZIN = R2 + s R2 (R1 + R3) C1 = R2 + s Leq (R1 + R3) >> R2
Function Generator C
- +
R2
R1 - +
} RA } RB
frequency R1, R2, C amplitude RA, RB
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PACKAGING INFORMATION 14-Lead Plastic, TSSOP, Package Type V
.025 (.65) BSC
.169 (4.3) .252 (6.4) BSC .177 (4.5)
.193 (4.9) .200 (5.1)
.047 (1.20) .0075 (.19) .0118 (.30) .002 (.05) .006 (.15)
.010 (.25) Gage Plane 0 - 8 .019 (.50) .029 (.75) Detail A (20X) Seating Plane
.031 (.80) .041 (1.05) See Detail "A"
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
REV 1.1.5 7/8/03
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Characteristics subject to change without notice.
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X9428
PACKAGING INFORMATION 16-Lead Plastic SOIC (300 Mil Body) Package Type S
0.290 (7.37) 0.299 (7.60)
0.393 (10.00) 0.420 (10.65)
PIN 1 INDEX
PIN 1
0.014 (0.35) 0.020 (0.51) 0.403 (10.2 ) 0.413 ( 10.5)
(4X) 7
0.092 (2.35) 0.105 (2.65)
0.050 (1.27)
0.003 (0.10) 0.012 (0.30)
0.010 (0.25) 0.020 (0.50) X 45
0.050" Typical
0 - 8 0.0075 (0.19) 0.010 (0.25) 0.015 (0.40) 0.050 (1.27) 0.420" 0.050" Typical
FOOTPRINT
0.030" Typical 16 Places
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice.
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X9428
Ordering Information X9428 Device Y P T V VCC Limits Blank = 5V 10% -2.7 = 2.7 to 5.5V Temperature Range Blank = Commercial = 0C to +70C I = Industrial = -40C to +85C Package P = 16-Lead Plastic DIP* S = 16-Lead SOIC V = 14-Lead TSSOP Potentiometer Organization Y= 2K W= 10K
*Note: P package only available as X9428WP16I-2.7 for prototyping. Other resistor values not available in package.
LIMITED WARRANTY
(c)Xicor, Inc. 2000 Patents Pending
Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices at any time and without notice. Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, or licenses are implied. TRADEMARK DISCLAIMER: Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All others belong to their respective owners. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending. LIFE RELATED POLICY In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and correction, redundancy and back-up features to prevent such an occurrence. Xicor's products are not authorized for use in critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice.
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