AD7921ARMZ

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1. DESCRIPTION

The AD7921ARMZ 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. The channel to be converted is selected through the DIN pin, and the mode of operation is controlled by CS. The serial data stream from the DOUT pin has a channel identifier bit, which provides information about the converted channel. The AD7921ARMZ use advanced design techniques to achieve very low power dissipation at high throughput rates. The reference for the part is taken internally from VDD, thereby allowing the widest dynamic input range to the ADC. The analog input range for the part, therefore, is 0 to VDD. The conversion rate is determined by the SCLK signal.

2. FEATURES

    1. Fast throughput rate: 250 kSPS

    2. Specified for VDD of 2.35 V to 5.25 V

    3. Low power:

        - 4 mW typ at 250 kSPS with 3 V supplies

        - 13.5 mW typ at 250 kSPS with 5 V supplies

    4. Wide input bandwidth:

        - 71 dB minimum SNR at 100 kHz input frequency

    5. Flexible power/serial clock speed management

    6. No pipeline delays

    7. High speed serial interface:

        - SPI®/QSPI™/MICROWIRE™/DSP compatible

    8. Standby mode: 1 μA maximum

    9. 8-lead TSOT package

  10. 8-lead MSOP package

3. APPLICATIONS

    1. Battery-powered systems:

    2. Personal digital assistants

    3. Medical instruments

    4. Mobile communications

    5. Instrumentation and control systems

    6. Data acquisition systems

    7. High speed modems

    8. Optical sensors