ADA4938-1ACPZ-R7 LFCSP Circuit Board Chips Integrated circuit Chip IC Electronics

ADA4938-1ACPZ-R7

Ultra-Low Distortion Differential ADC Driver

FEATURES

Extremely low harmonic distortion

−112 dBc HD2 @ 10 MHz

−79 dBc HD2 @ 50 MHz

−102 dBc HD3 @ 10 MHz

−81 dBc HD3 @ 50 MHz

Low input voltage noise: 2.2 nV/√Hz High speed

−3 dB bandwidth of 1.5 GHz, G = 1 Slew rate: 4700 V/μs 0.1 dB gain flatness to 125 MHz

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 Wide Supply

Voltage Range: +5 V & ± 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

GENERAL DESCRIPTION

The ADA4938-1 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 70 MHz. The output common mode voltage is adjustable over a wide range, allowing the ADA4938-1 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 ADA4938-1. A simple external feedback network of four resistors determines the amplifier’s closed-loop gain. The ADA4938-1 is fabricated using ADI’s proprietary third generation high-voltage 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 ADA4938-1 make it well suited for a wide variety of data acquisition and signal processing and applications. The ADA4938-1 is available in a Pb-free, 3 mm x 3mm lead frame chip scale package (LFCSP). Pinout has been optimized to facilitate layout and minimize distortion. The part is specified to operate over the extended industrial temperature range of −40°C to +85°C.

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