High Voltage, Differential 18-Bit ADC Driver

The ADA4922-1 is a differential driver for 16-bit to 18-bit analog-to-digital converters (ADCs) that have differential input ranges up to ±20 V. Configured as an easy-to-use, single-ended-to-differential amplifier, the ADA4922-1 requires no external components to drive ADCs. The ADA4922-1 provides essential benefits such as low distortion and high SNR that are required for driving ADCs with resolutions up to 18 bits.

With a wide supply voltage range (5 V to 26 V), high input impedance, and fixed differential gain of 2, the ADA4922-1 is designed to drive ADCs found to in a variety of applications, including industrial instrumentation.

The ADA4922-1 is manufactured on Analog Devices, Inc., proprietary, second-generation XFCB process that enables the amplifier to achieve excellent noise and distortion performance on high supply voltages.

The ADA4922-1 is available in an 8-lead 3 mm × 3 mm LFCSP as well as an 8-lead SOIC package. Both packages are equipped with an exposed paddle for more efficient heat transfer. The ADA4922-1 is rated to work over the extended industrial temperature range, −40°C to +85°C.

Applications

* High voltage data acquisition systems

* Industrial instrumentation

* Spectrum analysis

* ATE

* Medical instruments

* Single-ended-to-differential conversion

* Low distortion (VO, dm = 40 V p-p)

* −99 dBc HD at 100 kHz

* Low differential output referred noise: 12 nV/√Hz

* High input impedance: 11 MΩ

* Fixed gain of 2

* No external gain components required

* Low output-referred offset voltage: 1.1 mV maximum

* Low input bias current: 3.5 μA maximum

* Wide supply range

* 5 V to 26 V

* Can produce differential output signals in excess of 40 V p-p

* High speed

* 38 MHz, −3 dB bandwidth at 0.2 V p-p differential output

* Fast settling time

* 200 ns to 0.01% for 12 V step on ±5 V supplies

* Disable feature

* Available in space-saving, thermally enhanced packages

* 8-lead, 3 mm × 3 mm LFCSP

* 8-lead SOIC

* Low supply current: IS = 10 mA on ±12 V supplies