Datasheet ADA4937-1/ADA4937-2 (Analog Devices)

Ultralow Distortion Differential ADC Driver Data Sheet ADA4937-1 /ADA4937-2 FEATURES FUNCTIONAL BLOCK DIAGRAMS ADA4937-1 Extremely low harmonic distortion (HD) S S S S −112 dBc HD2 at 10 MHz –V –V –V –V 6 5 4 3 −84 dBc HD2 at 70 MHz 1 1 1 1 −77 dBc HD2 at 100 MHz –FB 1 12 PD −102 dBc HD3 at 10 MHz +IN 2 11 –OUT −91 dBc HD3 at 70 MHz –IN 3 10 +OUT −84 dBc HD3 at 100 MHz +FB 4 9 VOCM Low input voltage noise: 2.2 nV/√Hz High speed 5 6 7 8
001 1-
S S S S −3 dB bandwidth of 1.9 GHz, G = 1 +V +V +V +V
0659
Slew rate: 6000 V/μs, 25% to 75%
Figure 1. ADA4937-1
Fast overdrive recovery of 1 ns ADA4937-2 1 0.5 mV typical offset voltage 1 T 1 1 1 B S S 1 U NI F V V D O Externally adjustable gain + – – – P – 4 3 2 1 0 2 2 2 2 9 2 1 Differential-to-differential or single-ended-to-differential operation –IN1 1 18 +OUT1 +FB1 2 17 V Adjustable output common-mode voltage OCM1 +V 3 16 S1 –VS2 Single-supply operation: 3.3 V to 5 V +V 4 15 S1 –VS2 –FB2 5 14 APPLICATIONS PD2 +IN2 6 13 –OUT2 ADC drivers 7 8 9 0 1 2 1 1 1 Single-ended-to-differential converters 2 2 2 2
2
2 2 N B S S M T
-00
I V V C IF and baseband gain blocks F U –
91
+ + + O O
65
V +
0
Differential buffers
Figure 2. ADA4937-2
Line drivers –55 HD2, VS = 5.0V –60 GENERAL DESCRIPTION HD3, VS = 5.0V HD2, V –65 S = 3.3V HD3, V
The ADA4937-1/ADA4937-2 are low noise, ultralow distortion,
S = 3.3V –70
high speed differential amplifiers. They are an ideal choice for
) c –75 B
driving high performance ADCs with resolutions up to 16 bits
d –80 N (
from dc to 100 MHz. The adjustable level of the output common
IO –85
mode allows the ADA4937-1/ADA4937-2 to match the input
RT O –90 T
of the ADC. The internal common-mode feedback loop also
S DI –95
provides exceptional output balance as well as suppression of
–100
even-order harmonic distortion products.
–105
With the ADA4937-1/ADA4937-2, differential gain configurations
–110
are easily realized with a simple external feedback network of
–115
3
1 10 100
0 0 1- four resistors that determine the closed-loop gain of the amplifier.
FREQUENCY (MHz)
59 06 The ADA4937-1/ADA4937-2 are fabricated using Analog Devices, Figure 3. Harmonic Distortion vs. Frequency Inc., proprietary silicon-germanium (SiGe), complementary The ADA4937-1/ADA4937-2 are available in a Pb-free, 3 mm × bipolar process, enabling them to achieve very low levels of 3 mm, 16-lead LFCSP (ADA4937-1, single) or a Pb-free, 4 mm × distortion with an input voltage noise of only 2.2 nV/√Hz. 4 mm, 24-lead LFCSP (ADA4937-2, dual). The pinout has been The low dc offset and excellent dynamic performance of the optimized to facilitate PCB layout and minimize distortion. ADA4937-1/ADA4937-2 make them well-suited for a wide The ADA4937-1/ADA4937-2 are specified to operate over the variety of data acquisition and signal processing applications. automotive (−40°C to +105°C) temperature range and between 3.3 V and 5 V supplies.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS REVISION HISTORY SPECIFICATIONS 5 V OPERATION ±DIN to ±OUT Performance VOCM to ±OUT Performance 3.3 V OPERATION ±DIN to ±OUT Performance VOCM to ±OUT 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 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 IN SINGLE-SUPPLY APPLICATIONS SETTING THE OUTPUT COMMON-MODE VOLTAGE POWER-DOWN OPERATION LAYOUT, GROUNDING, AND BYPASSING HIGH PERFORMANCE ADC DRIVING 3.3 V OPERATION OUTLINE DIMENSIONS ORDERING GUIDE