ADA4937-1_16 Datasheet, PDF (1/28 Pages) Analog Devices – Ultralow Distortion Differential ADC Driver

Data Sheet
FEATURES
Extremely low harmonic distortion (HD)
−112 dBc HD2 at 10 MHz
−84 dBc HD2 at 70 MHz
−77 dBc HD2 at 100 MHz
−102 dBc HD3 at 10 MHz
−91 dBc HD3 at 70 MHz
−84 dBc HD3 at 100 MHz
Low input voltage noise: 2.2 nV/√Hz
High speed
−3 dB bandwidth of 1.9 GHz, G = 1
Slew rate: 6000 V/μs, 25% to 75%
Fast overdrive recovery of 1 ns
0.5 mV typical offset voltage
Externally adjustable gain
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Single-supply operation: 3.3 V to 5 V
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The ADA4937-1/ADA4937-2 are low noise, ultralow distortion,
high speed differential amplifiers. They are an ideal choice for
driving high performance ADCs with resolutions up to 16 bits
from dc to 100 MHz. The adjustable level of the output common
mode allows the ADA4937-1/ADA4937-2 to match the input
of the ADC. The internal common-mode feedback loop also
provides exceptional output balance as well as suppression of
even-order harmonic distortion products.
With the ADA4937-1/ADA4937-2, differential gain configurations
are easily realized with a simple external feedback network of
four resistors that determine the closed-loop gain of the amplifier.
The ADA4937-1/ADA4937-2 are fabricated using Analog Devices,
Inc., proprietary silicon-germanium (SiGe), complementary
bipolar process, enabling them to achieve very low levels of
distortion with an input voltage noise of only 2.2 nV/√Hz.
The low dc offset and excellent dynamic performance of the
ADA4937-1/ADA4937-2 make them well-suited for a wide
variety of data acquisition and signal processing applications.
Rev. F
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Ultralow Distortion
Differential ADC Driver
ADA4937-1/ADA4937-2
FUNCTIONAL BLOCK DIAGRAMS
ADA4937-1
–FB 1
+IN 2
–IN 3
+FB 4
12 PD
11 –OUT
10 +OUT
9 V_OCM
Figure 1. ADA4937-1
ADA4937-2
–IN1 1
+FB1 2
+V_S1 3
+V_S1 4
–FB2 5
+IN2 6
18 +OUT1
17 V_OCM1
16 –V_S2
15 –V_S2
14 PD2
13 –OUT2
Figure 2. ADA4937-2
–55
HD2, V_S = 5.0V
–60
HD3, V_S = 5.0V
–65
HD2, V_S = 3.3V
HD3, V_S = 3.3V
–70
–75
–80
–85
–90
–95
–100
–105
–110
–115
1
10
100
FREQUENCY (MHz)
Figure 3. Harmonic Distortion vs. Frequency
The ADA4937-1/ADA4937-2 are available in a Pb-free, 3 mm ×
3 mm, 16-lead LFCSP (ADA4937-1, single) or a Pb-free, 4 mm ×
4 mm, 24-lead LFCSP (ADA4937-2, dual). The pinout has been
optimized to facilitate PCB layout and minimize distortion.
The ADA4937-1/ADA4937-2 are specified to operate over the
automotive (−40°C to +105°C) temperature range and between
3.3 V and 5 V supplies.
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