AD7924BRUZ-REEL7

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1. DESCRIPTION

The AD7924BRUZ-REEL7 is a 12-bit, high speed, low power, 4-channel successive approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. The part contains a low noise, wide bandwidth track-andhold amplifier that can handle input frequencies in excess of 8 MHz. The conversion process and data acquisition are controlled using CS and the serial clock signal, allowing the device to easily interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and conversion is initiated at this point. There are no pipeline delays associated with the part. The AD7924BRUZ REEL7 uses advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, the AD7924BRUZ-REEL7 consumes 2 mA maximum with 3 V supplies; with 5 V supplies, the current consumption is 2.7 mA maximum. Through the configuration of the control register, the analog input range for the part can be selected as 0 V to REFIN or 0 V to 2 × REFIN, with either straight binary or twos complement output coding. The AD7924BRUZ-REEL7 features four single-ended analog inputs with a channel sequencer to allow a preprogrammed selection of channels to be converted sequentially. The conversion time for the AD7924BRUZ-REEL7 is determined by the SCLK frequency, which is also used as the master clock to control the conversion. 

2. FEATURES

    1. Fast throughput rate: 1 MSPS

    2. Specified for AVDD of 2.7 V to 5.25 V

    3. Low power

        - 6 mW maximum at 1 MSPS with 3 V supplies

        - 13.5 mW maximum at 1 MSPS with 5 V supplies

    4. 4 single-ended inputs with sequencer

    5. Wide input bandwidth: 70 dB SNR at 50 kHz input frequency

    6. Flexible power/serial clock speed management

    7. No pipeline delays

    8. High speed serial interface: SPI/QSPI™/MICROWIRE™/DSP compatible

    9. Shutdown mode: 0.5 µA maximum

  10. 16-lead TSSOP package

  11. Qualified for automotive applications

3. PRODUCT HIGHLIGHTS

    1. High Throughput with Low Power Consumption. 

        The AD7924-KGD offers throughput rates up to 1 MSPS. At the maximum throughput rate with 3 V supplies, the AD7924-KGD dissipates only 6 mW of power maximum.

    2. Four Single-Ended Inputs with Channel Sequencer.

        A consecutive sequence of channels can be selected, through which the ADC will cycle and convert on.

    3. Single-Supply Operation with VDRIVE Function.

        The AD7924-KGD operates from a single 2.7 V to 5.25 V supply. The VDRIVE function allows the serial interface to connect directly to 3 V or 5 V processor systems, independent of VDD.

    4. Flexible Power/Serial Clock Speed Management.

        The conversion rate is determined by the serial clock, allowing the conversion time to be reduced by increasing the serial clock speed. The part also features two shutdown modes to maximize power efficiency at lower throughput rates. Current consumption is 0.5 µA maximum when in full shutdown.

    5. No Pipeline Delay.

        The part features a standard successive approximation ADC with accurate control of the sampling instant via the CS input and once-off conversion control.