Ultralow Distortion

Differential ADC Driver

Data Sheet

ADA4937-1/ADA4937-2

Rev. F

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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.

FUNCTIONAL BLOCK DIAGRAMS

12

11

10

1

3

4

9

2

ADA4937-1

–FB

+IN

–IN

+FB

PD

–OUT

+OUT

Figure 1. ADA4937-1

2

1

3

4

5

6

18

17

16

15

14

13

+IN2

–FB2

+FB1

–IN1

–OUT2

PD2

+OUT1

ADA4937-2

Figure 2. ADA4937-2

–55

–60

–65

–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.