Datasheet ADA4932-1/ADA4932-2 (Analog Devices)

Low Power, Differential ADC Driver Data Sheet ADA4932-1 /ADA4932-2 FEATURES FUNCTIONAL BLOCK DIAGRAM High performance at low power ADA4932-1 High speed S S S S –V –V –V –V −3 dB bandwidth of 560 MHz, G = 1 61 51 41 31 0.1 dB gain flatness to 300 MHz Slew rate: 2800 V/μs, 25% to 75% –FB 1 12 PD +IN 2 11 Fast 0.1% settling time of 9 ns –OUT –IN 3 10 +OUT Low power: 9.6 mA per amplifier +FB 4 9 V Low harmonic distortion OCM 100 dB SFDR at 10 MHz
1
5 6 7 8
-00
90 dB SFDR at 20 MHz S S S S V V V V
752 7
+ + + +
0
Low input voltage noise: 3.6 nV/√Hz
Figure 1. ADA4932-1
±0.5 mV typical input offset voltage ADA4932-2 Externally adjustable gain 1 1 T 1 1 1 Can be used with gains less than 1 B S S 1 U NI F V V D + – – – P O– Differential-to-differential or single-ended-to-differential 4 3 2 1 0 2 2 2 2 9 2 1 operation –IN1 1 18 +OUT1 Adjustable output common-mode voltage +FB1 2 17 VOCM1 Input common-mode range shifted down by 1 VBE +V 3 16 S1 –VS2 Wide supply range: +3 V to ±5 V +V 4 15 S1 –VS2 –FB2 5 Available in 16-lead and 24-lead LFCSP packages 14 PD2 +IN2 6 13 –OUT2 APPLICATIONS 7 8 9 0 1 1 1 21 ADC drivers 2 2 2 2 2 2 N B S S M T
002
I V V Single-ended-to-differential converters – F + + C U
52-
+ OV O+
077
IF and baseband gain blocks
Figure 2. ADA4932-2
Differential buffers Line drivers GENERAL DESCRIPTION
The ADA4932-1/ADA4932-2 are the next generation AD8132 The ADA4932-1/ADA4932-2 were fabricated using the with higher performance and lower noise and power consumption. Analog Devices, Inc., proprietary silicon-germanium (SiGe) They are an ideal choice for driving high performance ADCs as complementary bipolar process, enabling it to achieve low levels a single-ended-to-differential or differential-to-differential of distortion and noise at low power consumption. amplifier. The output common-mode voltage is user adjustable The low offset and excellent dynamic performance of the by means of an internal common-mode feedback loop, allowing ADA4932-1/ADA4932-2 make them well suited for a wide the ADA4932-1/ADA4932-2 output to match the input of the variety of data acquisition and signal processing applications. ADC. The internal feedback loop also provides exceptional output balance as well as suppression of even-order harmonic The ADA4932-1 is available in a 16-lead LFCSP, and the distortion products. ADA4932-2 is available in a 24-lead LFCSP. The pinouts are optimized to facilitate the printed circuit board (PCB) layout With the ADA4932-1/ADA4932-2, differential gain configurations and minimize distortion. The ADA4932-1/ADA4932-2 are are easily realized with a simple external four-resistor feedback specified to operate over the −40°C to +105°C temperature network that determines the closed-loop gain of the amplifier. range; both operate on supplies between +3 V and ±5 V.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ±5 V OPERATION ±DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance 5 V OPERATION ±DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS TERMINOLOGY THEORY OF OPERATION APPLICATIONS INFORMATION ANALYZING AN APPLICATION CIRCUIT SETTING THE CLOSED-LOOP GAIN ESTIMATING THE OUTPUT NOISE VOLTAGE IMPACT OF MISMATCHES IN THE FEEDBACK NETWORKS CALCULATING THE INPUT IMPEDANCE FOR AN APPLICATION CIRCUIT Terminating a Single-Ended Input INPUT COMMON-MODE VOLTAGE RANGE INPUT AND OUTPUT CAPACITIVE AC COUPLING SETTING THE OUTPUT COMMON-MODE VOLTAGE HIGH PERFORMANCE PRECISION ADC DRIVER HIGH PERFORMANCE ADC DRIVING LAYOUT, GROUNDING, AND BYPASSING OUTLINE DIMENSIONS ORDERING GUIDE