Ultra-Low Distortion

Differential ADC Driver

Preliminary Technical Data

ADA4937-1

Rev. PrA

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FEATURES

Extremely low harmonic distortion

−100 dBc SFDR @ 10 MHz

−81 dBc SFDR @ 70 MHz

−72 dBc SFDR @ 100 MHz

Low input voltage noise: 2.2 nV/√Hz

High speed

−3 dB bandwidth of 1.6 GHz, G = 1

Slew rate: 5000 V/μs

0.1 dB gain flatness to 125 MHz

Fast settling to 0.01% in 8 ns

Fast overdrive recovery of 4 ns

1 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

Pb-free 3 mm x 3 mm LFCSP package

APPLICATIONS

ADC drivers

Single-ended-to-differential converters

IF and baseband gain blocks

Differential buffers

Line drivers

FUNCTIONAL BLOCK DIAGRAM

+

–

Figure 1.

GENERAL DESCRIPTION

The ADA4937-1 is a low noise, ultra-low distortion, high speed

differential amplifier. It is 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 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.

Full differential and single-ended to differential gain

configurations are easily realized with the ADA4937-1. A

simple external feedback network of four resistors determines

the amplifier’s closed-loop gain.

The ADA4937-1 is fabricated using ADI’s proprietary third

generation XFCB process, enabling it to achieve very low levels

of distortion with input voltage noise of only 2.2 nV/√Hz. The

low dc offset and excellent dynamic performance of the

ADA4937-1 make it well suited for a wide variety of data

acquisition and signal processing and applications.

The ADA4937-1 is available in a Pb-free, 3 mm x 3mm lead

frame chip scale package (LFCSP). It is specified to operate

over the temperature range of −40°C to +105°C.