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19-2601; Rev 0; 10/02
IF Digitally Controlled Variable-Gain Amplifier
General Description
The MAX2027 high-performance, digitally controlled variable-gain amplifier is designed for use from 50MHz to 400MHz. The device integrates a digitally controlled attenuator and a high-linearity IF amplifier in one package. Targeted for IF signal chains to adjust gain either dynamically or as a one-time channel gain setting, the MAX2027 is ideal for applications requiring high performance. The attenuator provides 23dB of attenuation range with 0.2dB accuracy. The MAX2027 is available in a thermally enhanced 20pin TSSOP-EP package and operates over the -40C to +85C temperature range. o 50MHz to 400MHz Frequency Range o Variable Gain: -8dB to +15dB o Output IP3: 40dBm (at All Gain Settings and 50MHz) o Noise Figure: 4.7dB at Maximum Gain o Digitally Controlled Gain with 1dB Resolution and 0.2dB Accuracy
Features
MAX2027
Ordering Information
PART MAX2027EUP-T TEMP RANGE -40C to +85C PIN-PACKAGE 20 TSSOP-EP*
*EP = exposed pad.
Applications
Cellular Base Stations Receiver Gain Control Transmitter Gain Control Broadband Systems Automatic Test Equipment Terrestrial Links
VCC RF_IN GND GND B4 B3 B2 B1 2 3 4 5 6 7 8 9 VCC 1
Pin Configuration/ Functional Diagram
20 GND
MAX2027
19 GND 18 ATTNOUT 17 GND 16 GND 15 AMPIN
ATTENUATION LOGIC CONTROL
AMP BIAS
14 IBIAS 13 ISET 12 RF_OUT 11 VCC
B0 10
________________________________________________________________ Maxim Integrated Products
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IF Digitally Controlled Variable-Gain Amplifier MAX2027
ABSOLUTE MAXIMUM RATINGS
All Pins (except B0-B4) to GND................................................................-0.3V to +5.5V Input Voltage Levels (B0-B4).....................-0.3V to (VCC + 0.5V) RF Input Signal .................................................................20dBm Continuous Power Dissipation (TA = +70C) 20-Pin TSSOP-EP (derate 21.7mW/C above +70C) ..................................1.7W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +165C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(Typical application circuit, VCC = +4.75V to +5.25V, GND = 0V. No RF signals applied, and RF input and output ports are terminated with 50. R1 = 825, TA = -40C to +85C. Typical values are at VCC = +5V and TA = +25C, unless otherwise noted.) (Notes 1, 2)
PARAMETER SUPPLY Supply Voltage Supply Current ISET Current CONTROL INPUTS/OUTPUTS Control Bits Input Logic High Input Logic Low Input Leakage Current -2 Parallel (Note 3) VCC - 0.5 0.5 +2 5 Bits V V A VCC ICC ISET 4.75 5 60 0.9 5.25 70 V mA mA SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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IF Digitally Controlled Variable-Gain Amplifier
AC ELECTRICAL CHARACTERISTICS
(Typical application circuit without matching, VCC = +4.75V to +5.25V, GND = 0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), R1 = 825, POUT = 5dBm, fIN = 50MHz, 50 RF system impedance. Typical values are at VCC = +5V and TA = +25C, unless otherwise noted.) (Notes 1, 2)
PARAMETER Frequency Range Gain Noise Figure Minimum Reverse Isolation Output 1dB Compression Point 2nd-Order Output Intercept Point 3rd-Order Output Intercept Point 2nd Harmonic 3rd Harmonic RF Gain-Control Range Gain-Control Resolution Attenuation Absolute Accuracy Attenuation Relative Accuracy Gain Drift Over Temperature Gain Flatness Over 50MHz BW Attenuator Switching Time Input Return Loss Output Return Loss Compared to the ideal expected attenuation Between adjacent states TA = -40C to +85C Peak-to-peak for all settings 50% control to 90% RF fR = 50MHz to 150MHz, all gain conditions fR = 50MHz to 150MHz, all gain conditions P1dB OIP2 OIP3 2fIN 3fIN SYMBOL fR G NF Max gain Max gain Max gain Max gain f1 + f2, f1 = 50MHz, f2 = 51MHz, 5dBm/tone at RF_OUT All gain conditions, 5dBm/tone at RF_OUT All gain conditions All gain conditions CONDITIONS MIN 50 15.3 4.7 22 20.6 42 40 -42 -68 23 1 0.2 0.2 0.1 0.3 40 15 15 TYP MAX 400 UNITS MHz dB dB dB dBm dBm dBm dBc dBc dB dB dB dB dB dB ns dB dB
MAX2027
Note 1: Guaranteed by design and characterization. Note 2: All limits reflect losses of external components. Output measurements are taken at RF OUT using the typical application circuit. Note 3: Device draws current in excess of the specified supply current when a digital input is driven with a voltage of VIN < VCC - 0.5V or VIN > 0.5V. This is due to the CMOS input stage crowbar current. Part may be damaged if operated in this condition for an extended period of time.
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IF Digitally Controlled Variable-Gain Amplifier MAX2027
Typical Operating Characteristics
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825, TA = +25C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
INPUT RETURN LOSS vs. RF FREQUENCY WITHOUT MATCHING (ALL STATES)
MAX2027 toc01 MAX2027 toc02
SUPPLY CURRENT vs. TEMPERATURE
68 66 SUPPLY CURRENT (mA) 64 62 60 58 56 54 52 -40 -25 -10 5 20 35 50 65 80 TEMPERATURE (C) VCC = 4.75V VCC = 5.25V VCC = 5.0V 5 10 INPUT RETURN LOSS (dB) 15 20 25 30 35
OUTPUT RETURN LOSS vs. RF FREQUENCY WITHOUT MATCHING (ALL STATES)
MAX2027 toc03
0 5 OUTPUT RETURN LOSS (dB) 10 15 20 25 30 35
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FREQUENCY (MHz)
FREQUENCY (MHz)
GAIN vs. RF FREQUENCY WITHOUT MATCHING (ALL STATES)
MAX2027 toc04
REVERSE ISOLATION vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc05
INPUT RETURN LOSS vs. RF FREQUENCY WITH MATCHING (ALL STATES)
5 INPUT RETURN LOSS (dB) 10 15 20 25 30 35 40
MAX2027 toc06
20 15 10 GAIN (dB) 5 0 -5 -10 -15 50 100 150 200 250 300 350
35 30 REVERSE ISOLATION (dB) 25 20 15 10 5
0
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250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
OUTPUT RETURN LOSS vs. RF FREQUENCY WITH MATCHING (ALL STATES)
5 OUTPUT RETURN LOSS (dB) 10 GAIN (dB) 15 20 25 30 35 40 250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz) -5 -10 -15
MAX2027 toc07
GAIN vs. RF FREQUENCY WITH MATCHING (ALL STATES)
MAX2027 toc08
REVERSE ISOLATION vs. FREQUENCY WITH MATCHING
MAX2027 toc09
0
20 15 10 5 0
35 30 REVERSE ISOLATION (dB) 25 20 15 10 5
250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
4
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IF Digitally Controlled Variable-Gain Amplifier
Typical Operating Characteristics (continued)
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825, TA = +25C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
GAIN vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc10
MAX2027
GAIN vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc11
GAIN vs. FREQUENCY WITH MATCHING
17 16 GAIN (dB) 15 14 13 12 11 10 250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz) TA = +85C TA = -40C TA = +25C
MAX2027 toc12
18 17 16 GAIN (dB) TA = +25C, +85C
18 17 16 GAIN (dB) 15 14 13 VCC = 5.25V VCC = 4.75V VCC = 5.0V
18
15 14 13 12 11 10 50 100 150 200 TA = -40C
12 11 10
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FREQUENCY (MHz)
FREQUENCY (MHz)
ATTENUATION ABSOLUTE ACCURACY WITHOUT MATCHING (ALL STATES)
MAX2027 toc13a
ATTENUATION ABSOLUTE ACCURACY WITH MATCHING (ALL STATES)
MAX2027 toc13b
ATTENUATION RELATIVE ACCURACY WITHOUT MATCHING (ALL STATES)
0.4 RELATIVE ACCURACY (dB) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
MAX2027 toc14a
1.0 0.8 ABSOLUTE ACCURACY (dB) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 50 100 150 200 250 300 350
2.0 1.5 ABSOLUTE ACCURACY (dB) 1.0 0.5 0 -0.5 -1.0
0.6
400
250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
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FREQUENCY (MHz)
FREQUENCY (MHz)
ATTENUATION RELATIVE ACCURACY WITH MATCHING (ALL STATES)
MAX2027 toc14b
NOISE FIGURE vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc15
NOISE FIGURE vs. FREQUENCY WITH MATCHING
6.5 6.0 NOISE FIGURE (dB) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 TA = +85C TA = +25C TA = -40C
MAX2027 toc16
0.5 0.4 RELATIVE ACCURACY (dB) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5
7.0 6.5 6.0 NOISE FIGURE (dB) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 TA = -40C TA = +25C TA = +85C
7.0
250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
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250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
FREQUENCY (MHz)
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IF Digitally Controlled Variable-Gain Amplifier MAX2027
Typical Operating Characteristics (continued)
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825, TA = +25C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
OUTPUT P1dB vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc17
OUTPUT P1dB vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc18
OUTPUT P1dB vs. FREQUENCY WITH MATCHING
MAX2027 toc19
23 22 OUTPUT P1dB (dBm) 21 20 19 18 17 50 100 150 200 250 300 350 TA = -40C TA = +25C TA = +85C
23 22 OUTPUT P1dB (dBm) 21 20 19 18 17 VCC = +4.75V VCC = +5V VCC = +5.25V
23 22 OUTPUT P1dB (dBm) 21 20 19 18 17 TA = -40C TA = +25C
TA = +85C
400
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250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
OUTPUT IP3 vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc20
OUTPUT IP3 vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc21
OUTPUT IP3 vs. FREQUENCY WITH MATCHING
PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz
MAX2027 toc22
44 42 OUTPUT IP3 (dBm) 40
PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz
44 42 OUTPUT IP3 (dBm) 40
PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz
42 40 OUTPUT IP3 (dBm) 38 36 34 32 30 28
TA = +25C 38 36 34 32 30 50 100 150 200 250 300 350 400 FREQUENCY (MHz) TA = -40C TA = +85C
VCC = +5.25V 38 36 34 32 30 50 100 150 200 250 300 350 400 FREQUENCY (MHz) VCC = +4.75V
TA = +25C
VCC = +5V
TA = -40C
TA = +85C
250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
INPUT IP3 vs. ATTENUATION STATE WITHOUT MATCHING
MAX2027 toc23
INPUT IP3 vs. ATTENUATION STATE WITH MATCHING
MAX2027 toc24
2ND HARMONIC vs. FREQUENCY WITHOUT MATCHING
-25 -30 HARMONIC (dBc) -35 -40 -45 -50 -55 -60 TA = +85C TA = -40C TA = +25C
MAX2027 toc25
55 50 45 INPUT IP3 (dBm) 40 35 30 25 20 15 0 4 8 12 16 20 fIN = 200MHz fIN = 400MHz PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz
55 50 45 INPUT IP3 (dBm)
PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz
-20
fIN = 50MHz
40 35 30 25 20 15
fIN = 50MHz fIN = 200MHz fIN = 400MHz
-65 -70 0 4 8 12 16 20 24 50 100 150 200 250 300 350 400 ATTENUATION STATE FREQUENCY (MHz)
24
ATTENUATION STATE
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IF Digitally Controlled Variable-Gain Amplifier
Typical Operating Characteristics (continued)
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825, TA = +25C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
2ND HARMONIC vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc26
MAX2027
2ND HARMONIC vs. FREQUENCY WITH MATCHING
MAX2027 toc27
OUTPUT IP2 vs. FREQUENCY WITHOUT MATCHING (f1 + f2)
49 47 OUTPUT IP2 (dBm) 45 43 41 39 37 35 TA = -40C TA = +85C TA = +25C PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz
MAX2027 toc28
-30 -35 VCC = +5V HARMONIC (dBc) -40 -45 -50 -55 -60 50 100 150 200 250 300 350 VCC = +4.75V VCC = +5.25V
-20 -25 -30 HARMONIC (dBc) -35 -40 -45 -50 -55 -60 -65 -70 TA = +85C TA = -40C TA = +25C
400
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FREQUENCY (MHz)
OUTPUT IP2 vs. FREQUENCY WITHOUT MATCHING (f1 + f2)
MAX2027 toc29
OUTPUT IP2 vs. FREQUENCY WITH MATCHING (f1 + f2)
MAX2027 toc30
3RD HARMONIC vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc31
49 47 OUTPUT IP2 (dBm) 45 43 41 39 37 35 50
PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz VCC = +5V
49 47 OUTPUT IP2 (dBm) 45 43 41 39 37 35
PRF1 = PRF2 = 5dBm AT OUTPUT, f = 1MHz TA = +25C
-55 -60 HARMONIC (dBc) -65 -70 TA = -40C -75 -80 -85 TA = +85C TA = +25C
VCC = +5.25V
VCC = +4.75V
TA = +85C
TA = -40C
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FREQUENCY (MHz)
FREQUENCY (MHz)
3RD HARMONIC vs. FREQUENCY WITHOUT MATCHING
MAX2027 toc32
3RD HARMONIC vs. FREQUENCY WITH MATCHING
MAX2027 toc33
-55 -60 VCC = +4.75V HARMONIC (dBc) -65 -70 VCC = +5V -75 -80 -85 50 100 150 200 250 300 350 VCC = +5.25V
-55 -60 TA = +25C HARMONIC (dBc) -65 -70 -75 -80 -85
TA = -40C
TA = +85C
400
250 260 270 280 290 300 310 320 330 340 350 FREQUENCY (MHz)
FREQUENCY (MHz)
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7
IF Digitally Controlled Variable-Gain Amplifier MAX2027
Pin Description
PIN 1, 2, 11 3 4, 5, 16, 17, 19, 20, EP 6-10 12 13 14 15 18 NAME VCC RF_IN GND B4-B0 RF_OUT ISET IBIAS AMPIN ATTNOUT FUNCTION Power Supply. Bypass to GND with capacitors as close to the pin as possible as shown in the typical application circuit (Figure 1). Signal Input. See the typical application circuit for recommended component values. Requires an external DC-blocking capacitor. Ground. Use low-inductance layout techniques on PC board. Solder the exposed pad evenly to the board ground plane. Gain-Control Bits. See Table 3 for gain setting. Signal Output. Requires an external pullup choke inductor (52mA typical current) to VCC along with a DC-blocking capacitor (Figure 1). Connect an 825 resistor from ISET to GND. Amplifier Bias. Connect to AMPIN (pin 15) through a choke inductor (0.3mA typ). Amplifier Input. Requires a DC-coupling capacitor to allow biasing. Attenuator Output. Requires an external DC-blocking capacitor.
Detailed Description
The MAX2027 is a high-performance, digitally controlled variable-gain amplifier for use in applications from 50MHz to 400MHz. The MAX2027 incorporates a digital attenuator with a 23dB selectable attenuation range followed by a fixedgain, high-linearity amplifier. The attenuator is digitally controlled through five logic lines: B0-B4. This on-chip attenuator provides up to 23dB of attenuation with 0.2dB accuracy. The fixed-gain amplifier utilizes negative feedback to achieve high stability, gain, linearity, and wide bandwidth.
Table 1. Suggested Components of Typical Application Circuit
COMPONENT C1, C3, C4, C6, C7, C10 C2, C5 R1 R2-R6 L1 L2 VALUE 1000pF 100pF 825 1% 47k 330nH 680nH SIZE 0603 0603 0603 0603 0805 1008
Applications Information
Input and Output Matching
The MAX2027 incorporates on-chip input and output matching for operation below 150MHz. Use a DC-blocking capacitor value of 1000pF for pins 3, 12, and 18 (see Figure 1). For operation above 150MHz, external matching improves performance. Table 1 and Table 2 provide recommended components for device operation.
Table 2. Suggested Matching Components
FREQUENCY 200MHz 250MHz 300MHz 400MHz COMPONENT L3, L4 C8, C9 L3, L4 C8, C9 L3, L4 C8, C9 L3, L4 C8, C9 VALUE 18nH 8pF 15nH 8pF 11nH 7pF 10nH 5pF SIZE 0603 0603 0603 0603 0603 0603 0603 0603
Digitally Controlled Attenuator
The digital attenuator is controlled through five logic lines: B0, B1, B2, B3, and B4. Table 3 lists the attenuation settings. The input and output of this attenuator require external DC-blocking capacitors. This attenuator insertion loss is 2dB when the attenuator is set to 0dB (B0 = B1 = B2 = B3 = B4 = 0).
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IF Digitally Controlled Variable-Gain Amplifier MAX2027
VCC C7 C1 RF IN C8* VCC R6 R5 R4 R3 R2 L3* C2
1 2 3 4 5 B4 B3 6 7 8 9 10 ATTENUATION LOGIC CONTROL AMP BIAS
20
MAX2027
19 L4* 18 17 16 L1 15 14 13 12 11 L2 AMPIN IBIAS ISET R1 ATTNOUT C3
C9*
CONTROL INPUTS
C10 RF OUT C4
B2 B1 B0
VCC *FOR EXTERNAL MATCHING C5 C6
Figure 1. Typical Application Circuit
Fixed-Gain Amplifier
The MAX2027 integrates a fixed-gain amplifier in a negative feedback topology. This fixed-gain amplifier is optimized for a frequency range of operation from 50MHz to 400MHz with a high-output third-order intercept point (OIP3). The bias current is chosen to optimize the IP3 of the amplifier. When R1 is 825, the current consumption is 60mA while exhibiting a typical 40dBm output IP3 at 50MHz.
tance. For the best performance, route the ground pin traces directly to the exposed pad under the package. Solder the exposed pad on the bottom of the device package evenly to the board ground plane to provide a heat transfer path along with RF grounding.
Power-Supply Bypassing
Proper voltage-supply bypassing is essential for highfrequency circuit stability. Bypass each VCC pin with a 1000pF and 100pF capacitor. Connect the 100pF capacitor as close to VCC pins as possible.
Choke Inductor
The fixed-gain amplifier output port requires an external pullup choke inductor to VCC. At the input, connect a bias inductor of 330nH from AMPIN (pin 15) to IBIAS (pin 14). At the output, connect a 680nH choke inductor from RF_OUT (pin 12) to VCC (pin 11) to provide bias current to the amplifier.
Exposed Pad RF/Thermal Considerations
The exposed paddle (EP) of the MAX2027's 20-pin TSSOP-EP package provides a low thermal-resistance path to the die. It is important that the PC board on which the MAX2027 is mounted be designed to conduct heat from the EP. In addition, provide the EP with a low-inductance path to electrical ground. The EP should be soldered to a ground plane on the PC board, either directly or through an array of plated via holes.
Layout Considerations
A properly designed PC board is an essential part of any RF/microwave circuit. Keep RF signal lines as short as possible to reduce losses, radiation, and induc-
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9
IF Digitally Controlled Variable-Gain Amplifier MAX2027
Table 3. Attenuation Setting vs. GainControl Bits
ATTENUATION 2dB MINIMUM INSERTION LOSS 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 B4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 B3* 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 X X X X X X X X B2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 B1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 B0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Chip Information
TRANSISTOR COUNT: 325
*Enabling B4 disables B3, and the minimum attenuation is 16dB.
10
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IF Digitally Controlled Variable-Gain Amplifier
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
TSSOP, 4.0,EXP PADS.EPS
MAX2027
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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