深圳市中立信电子科技有限公司

AD7921ARMZ

模数转换器 - ADC 2CH 2.35-5.25V 250 kSPS 12-Bit

2-Channel, 2.35 V to 5.25 V  250 kSPS, 10-/12-Bit ADCs

GENERAL DESCRIPTION AD7921ARMZ

The AD7911/AD79211  are 10-bit and 12-bit, high speed, low power, 2-channel successive approximation ADCs, respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates of up to 250 kSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier, which can handle input frequencies in excess of 6 MHz. The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS, and the conversion is also initiated at this point. There are no pipeline delays associated with the part.

FEATURES AD7921ARMZ

Fast throughput rate: 250 kSPS

Specified for VDD of 2.35 V to 5.25 V

Low power:

4 mW typ at 250 kSPS with 3 V supplies

13.5 mW typ at 250 kSPS with 5 V supplies

Wide input bandwidth:

71 dB minimum SNR at 100 kHz input frequency

Flexible power/serial clock speed management

No pipeline delays

High speed serial interface:

SPI®/QSPI™/MICROWIRE™/DSP compatible

Standby mode: 1 μA maximum

8-lead TSOT package

8-lead MSOP package

APPLICATIONS AD7921ARMZ

Battery-powered systems:

Personal digital assistants

Medical instruments

Mobile communications

Instrumentation and control systems

Data acquisition systems

High speed modems

Optical sensors