250 SPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC

The AD7656A contains six 16-bit, fast, low power, successive approximation analog-to-digital converters (ADCs) all in the one package that is designed on the iCMOS® process (industrial CMOS). iCMOS is a process combining high voltage silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high performance analog ICs, capable of 33 V operation in a footprint that no previous generation of high voltage devices could achieve. Unlike analog ICs using conventional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, which dramatically reduces power consumption and package size.

The AD7656A features throughput rates of up to 250 kSPS. It contains wide bandwidth (12 MHz), track-and-hold amplifiers that can handle input frequencies up to 12 MHz.

The conversion process and data acquisition are controlled using CONVST x signals and an internal oscillator. Three CONVST x pins (CONVST A, CONVST B, and CONVST C) allow independent, simultaneous sampling of the three ADC pairs. The AD7656A has a high speed parallel and serial interface, allowing the device to interface with microprocessors or digital signal processors (DSPs). In serial interface mode, the AD7656A has a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656A can accommodate true bipolar input signals in the ±4 × VREF range and ±2 × VREF range. The AD7656A also contains an on-chip 2.5 V reference.

Multifunction pin names may be referenced by their relevant function only.

Please visit next generation product AD7606. For reduced decoupling requirements visit the AD7656A-1 product page.

PRODUCT HIGHLIGHTS

* Six 16-bit, 250 kSPS ADCs on board.

* Six true bipolar, high impedance analog inputs.

* Parallel and high speed serial interfaces.

APPLICATIONS

* Power line monitoring systems

* Instrumentation and control systems

* Multi-axis positioning systems

* 6 independent analog-to-digital converters (ADCs)

* True bipolar analog inputs

* Pin-/software-selectable ranges: ±10 V or ±5 V

* Fast throughput rate: 250 kSPS

* iCMOS® process technology

* Low power: 140 mW at 250 kSPS with 5 V supplies

* Wide input bandwidth:

86.5 dB SNR at 50 kHz input frequency