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Final Electrical Specifications
LTC1992-2 Gain of 2 Fully Differential Input/Output Amplifier/Driver
July 2003
FEATURES
s s s
DESCRIPTIO
s s s
s s s s s s
Differential Inputs Differential Outputs Fixed Gain of 2 0.3% (Max) Gain Error from -40C to 85C CLOAD Stable from 0 to 10,000pF Adjustable Output Common Mode Voltage Output Common Mode Level Independent of Input Common Mode Level Low Supply Current 1mA(Max) High Output Current 10mA (Min) Rail-to-Rail Output Swing Specified on a Single 2.7V to 5V Supply DC Offset Voltage <2.5mV (Max) 8-Lead MSOP Package
The LTC(R)1992-2 is a fully differential amplifier with a fixed gain of 2. The LTC1992-2 has a separate internal common mode feedback path for better common mode noise rejection, outstanding output gain and phase balancing and reduced second order harmonics. The VOCM pin sets the output common mode level independent of the input common mode level. This feature makes level shifting of signals easy. The integrated precision gain setting resistors ensure high gain accuracy without external components. The differential inputs operate with signals ranging from rail-to-rail with a common mode level from the negative supply up to 1.3V from the positive supply. The differential input DC offset is typically 250V. The rail-to-rail outputs sink and source 10mA. The LTC1992-2 is stable for all capacitive loads up to 10,000pF. The LTC1992-2 can be used in single-supply applications with supply voltages as low as 2.7V. It can also be used with dual supplies up to 5V. The LTC1992-2 is available in an 8-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s
Differential Driver/Receiver Differential Amplification Single-Ended to Differential Conversion Level Shifting
TYPICAL APPLICATIO
Single-Supply Single-Ended to Differential Conversion
5V 3 LTC1992-2 2.5V VIN 0V 8 30k 60k VMID 7 2 0.01F -VS 6
1992 TA01a
+VS 60k 2.5V 0V 5 5V 2.5V
VIN
1
30k VOCM
- +
4
+ -
OUT -
OUT + IN + = 0V
1992-2 TA01b
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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19922ia
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1
LTC1992-2
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW -IN 1 VOCM 2 +VS 3 +OUT 4 8 7 6 5 +IN VMID -VS -OUT
Total Supply Voltage (+V S to -V S) .......................... 12V Maximum Voltage on any Pin ........................... (-VS - 0.3V) VPIN (+VS + 0.3V) Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 5) LTC1992-2CMS8 .................................-40C to 85C LTC1992-2IMS8 ..................................-40C to 85C LTC1992-2HMS8 ...............................-40C to 125C Specified Temperature Range (Note 6) LTC1992-2CMS8 .................................-40C to 85C LTC1992-2IMS8 ..................................-40C to 85C LTC1992-2HMS8 ...............................-40C to 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
- +-
+
LTC1992-2CMS8 LTC1992-2IMS8 LTC1992-2HMS8 MS8 PART MARKING LTYV LTZD LTAGA
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 250C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. +VS = 5V, -VS = 0V, VINCM = VOUTCM = VOCM = 2.5V, unless otherwise noted. VOCM is the voltage on the VOCM pin. VOUTCM is defined as (V+OUT + V- OUT)/2. VINCM is defined as (V+IN + V-IN)/2. VINDIFF is defined as (V+IN - V- IN). VOUTDIFF is defined as (V+OUT - V-OUT). Typical values are at TA = 25C.
LTC1992-2CMS8 LTC1992-2IMS8 MIN TYP MAX
q q
ELECTRICAL CHARACTERISTICS
SYMBOL GDIFF
PARAMETER Differential Gain Differential Gain Error Differential Gain Nonlinearity Differential Gain Temperature Coefficient Differential Offset Voltage (Amplifier Input Referred)(Note 7)
CONDITIONS
LTC1992-2HMS8 MIN TYP MAX 2 0.1 50 35 0.25 0.25 0.25 10 10 10 45 0.35
UNITS % ppm ppm/C mV mV mV V/C V/C V/C nV/Hz
2 0.1 50 35 0.25 0.25 0.25 10 10 10 45 22.5 55 75 30 60 80 1 0.1 -85 0.5 1 2 10 10 10
0.3
VOSDIFF
VS = 2.7V VS = 5V VS = 5V VS = 2.7V VS = 5V VS = 5V f = 1kHz
q q q q q q
2.5 2.5 2.5
4 4 4
VOSDIFF/T Differential Offset Voltage Drift (Amplifier Input Referred)(Note 7) en RIN VINCMR CMRR PSRR GCM Input Referred Noise Voltage Density Input Resistance, Single-Ended +IN, -IN Pins Input Signal Common Mode Range Common Mode Rejection Ratio (Amplifier Input Referred)(Note 7) Power Supply Rejection Ratio (Amplifier Input Referred)(Note 7) Common Mode Gain(VOUTCM /VOCM) Common Mode Gain Error Output Balance Error(VOUTCM /(VOUTDIFF) Common Mode Offset Voltage (VOUTCM - VOCM)
q
37.5
22 55 72
30 -0.1V to 4.3V 60 80 1 0.1 -85 0.5 1 2 10 10 10
38
VS = 5V VINCM = -0.1V to 3.7V q VS = 2.7V to 5V
q
-0.1V to 4.3V
VOUTDIFF = -2V to +2V VS = 2.7V VS = 5V VS = 5V VS = 2.7V VS = 5V VS = 5V
q q q q q q q q
0.3 -60 12 15 18
0.35 -60 15 17 20
VOSCM
VOSCM /T Common Mode Offset Voltage Drift
V/C V/C V/C
19922ia
2
U
k V dB dB % dB mV mV mV
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LTC1992-2
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. +VS = 5V, -VS = 0V, VINCM = VOUTCM = VOCM = 2.5V, unless otherwise noted. VOCM is the voltage on the VOCM pin. VOUTCM is defined as (V+OUT + V-OUT)/2. VINCM is defined as (V+IN + V-IN)/2. VINDIFF is defined as (V+IN - V-IN). VOUTDIFF is defined as (V+OUT - V-OUT). Typical values are at TA = 25C.
LTC1992-2HMS8 MIN TYP MAX q (-VS)+ 0.5V (+VS) - 1.3V (-VS)+ 0.5V (+VS) - 1.3V 500 VS = 2.7V to 5V
q
SYMBOL VOUTCMR RINVOCM IBVOCM VMID VOUT
PARAMETER Output Signal Common Mode Range (Voltage Range for the VOCM Pin) Input Resistance, VOCM Pin Input Bias Current, VOCM Pin Voltage at the VMID Pin Output Voltage, High (Note 2) Output Voltage, Low (Note 2) Output Voltage, High (Note 2) Output Voltage, Low (Note 2) Output Voltage, High (Note 2) Output Voltage, Low (Note 2)
CONDITIONS
LTC1992-2CMS8 LTC1992-2IMS8 MIN TYP MAX
UNITS V M pA
500 2 2.56 2.43 2.60 2.50 2.29 0.10 0.25 0.35 4.90 4.80 4.70 0.10 0.25 0.35 4.85 4.80 4.60 -4.90 -4.75 -4.65 20 20 20 13 13 13 0.35 11 2.7 0.65 0.8 0.7 0.9 2.50 2.69 2.61 2.52 0.02 0.10 0.20 4.99 4.90 4.81 0.02 0.10 0.20 4.99 4.89 4.80 4.98 4.90 4.80 30 30 30 30 30 30 1.0 4 11 1 1.5 1.2 1.8 1.0 1.2 1.2 1.5 -4.85 -4.75 -4.55 0.10 0.30 0.42 0.10 0.25 0.41 2.57
2 2.44 2.60 2.50 2.29 2.50 2.69 2.61 2.52 0.02 0.10 0.20 4.90 4.85 4.75 4.99 4.90 4.81 0.02 0.10 0.20 4.90 4.85 4.65 4.99 4.89 4.80 - 4.98 - 4.90 - 4.80 20 20 20 13 13 13 0.35 2.7 0.65 0.75 0.70 0.80 30 30 30 30 30 30 1.0 4
q q q q q q q q q q q q q q q q q q q q q q q q q q
V V V V V V V V V V V V V V V V V V V mA mA mA mA mA mA V/s MHz V mA mA mA mA
VS = 2.7V, Load = 10k VS = 2.7V, Load = 5mA VS = 2.7V,Load = 10mA VS = 2.7V, Load = 10k VS = 2.7V, Load = 5mA VS = 2.7V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 2.7V, VOUT = 1.35V VS = 5V, VOUT = 2.5V VS = 5V, VOUT = 0V VS = 2.7V, VOUT =1.35V VS = 5V, VOUT = 2.5V VS = 5V, VOUT = 0V fTEST = 180kHz VS = 2.7V to 5V VS = 5V
ISC
Output Short-Circuit Current Sourcing (Notes 2,3) Output Short-Circuit Current Sinking (Notes 2,3)
SR GBW VS IS
Slew Rate (Note 4) Gain-Bandwidth Product Supply Voltage Range Supply Current
q q
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Output load is connected to the midpoint of the +VS and -VS potentials. Measurement is taken single-ended, one output loaded at a time. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum when the output is shorted indefinitely. Note 4: Slew Rate is measured single-ended. The numbers listed are also single-ended and the differential slew rate would double the listed numbers. Note 5: The LTC1992-2CMS8, LTC1992-2IMS8 and LTC1992-2HMS8 are guaranteed functional over the extended operating temperature range of -40C to 125C.
Note 6: The LTC1992-2CMS8 is guaranteed to meet the specified performance limits over the 0C to 70C temperature range and designed, characterized and expected to meet the specified performance from -40C to 85C but is not tested or QA sampled at these temperatures. LTC19922IMS8 is guaranteed to meet specified performance limits over the -40C to 85C temperature range. The LTC1992-2HMS8 is guaranteed to meet the specified performance limits over the -40C to 125C temperature range. Note 7: Differential Offset Voltage, Differential Offset Voltage Drift, CMRR and PSRR are referred to the internal amplifier's input to allow for direct comparison with discrete amplifiers. The LTC1992-2 is an inverting topology with a gain of two. The output referred offset is three times the amplifiers input offset.
19922ia
3
LTC1992-2
PI FU CTIO S
-IN, +IN (Pins 1,8): Inverting and Noninverting Inputs of the Amplifier. These pins are connected to on-chip gain setting resistors. The input resistors are nominally 30k. VOCM (Pin 2): Output Common Mode Voltage Set Pin. The voltage on this pin sets the output signal's common voltage level. The output common mode level is set independent of the input common mode level. This is a high impedance input and must be connected to a known and controlled voltage. It must never be left floating. +VS, -VS (Pins 3, 6): The +VS and -VS power supply pins should be bypassed with 0.1F capacitors to an adequate analog ground or ground plane. The bypass capacitors should be located as closely as possible to the supply pins. +OUT, -OUT (Pins 4,5): The Positive and Negative Outputs of the Amplifier. These rail-to-rail outputs are designed to drive capacitive loads up to 10,000 pF. VMID (Pin 7): Mid-Supply Reference. This pin is connected to an on-chip resistive voltage divider (two 200k 25% resistors) to provide a mid-supply reference. This provides a convenient way to set the output common mode voltage level at half-supply. If used for this purpose, the pin should be bypassed with a 0.1F capacitor to ground and connected to VOCM (Pin 2). If this reference voltage is not used, leave the pin floating.
BLOCK DIAGRA
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PART NUMBER LTC1565-31 LTC1566-1 LT1567 LT6600-2.5 LT6600-10 LT6600-20 DESCRIPTION 650kHz Continuous Time, Linear Phase Lowpass Filter Low Noise 2.3MHz Continuous Time Lowpass Filter 1.4nV/Hz, 175MHz Op Amp and Inverter/Filter Building Block Very Low Noise, Differential Amplifier and 2.5MHz Lowpass Filter Very Low Noise, Differential Amplifier and 10MHz Lowpass Filter Very Low Noise, Differential Amplifier and 20MHz Lowpass Filter COMMENTS 7th Order Lowpass Filter, Differential Inputs/Output 7th Order Lowpass Filter, Differential Inputs/Output 2nd Order Filter with up to 5MHz Cutoff, Single-Ended to Differential Conversion Fully Differential Amplifier with 4th Order Lowpass Filter Fully Differential Amplifier with 4th Order Lowpass Filter Fully Differential Amplifier with 4th Order Lowpass Filter
19922ia
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
W
U
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+VS 3 +VS
-IN
30k 1 200k -VS
60k
- +
30k
+ -
60k
4
+OUT
VMID
7 +VS 200k 5 -OUT
+IN
8
-VS 6 -VS 2 VOCM
1992 BD
LT/TP 0703 1K REV A * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003

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