4-Channel, 1 MSPS, 8-/10-/12-Bit ADCs

with Sequencer in 16-Lead TSSOP

Data Sheet

AD7904/AD7914/AD7924

Rev. C

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FEATURES

Fast throughput rate: 1 MSPS

Low power:

6 mW maximum at 1 MSPS with 3 V supplies

13.5 mW maximum at 1 MSPS with 5 V supplies

4 single-ended inputs with sequencer

Wide input bandwidth

AD7924, 70 dB SNR at 50 kHz input frequency

Flexible power/serial clock speed management

No pipeline delays

High speed serial interface: SPI/QSPI™/

MICROWIRE™/DSP compatible

Shutdown mode: 0.5 µA maximum

16-lead TSSOP package

Qualified for automotive applications

FUNCTIONAL BLOCK DIAGRAM

AGND

SCLK

DOUT

DIN

CS

CONTROL LOGIC

8-/10-/12-BIT

SUCCESSIVE

APPROXIMATION

ADC

T/H

I/P

MUX

AD7904/AD7914/AD7924

SEQUENCER

Figure 1.

GENERAL DESCRIPTION

The AD7904/AD7914/AD7924 are, respectively, 8-bit, 10-bit, and

12-bit, high speed, low power, 4-channel successive approxi-

mation 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

parts contain a low noise, wide bandwidth track-and-hold

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 inter-

face 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 AD7904/AD7914/AD7924 use advanced design techniques

to achieve very low power dissipation at maximum throughput

rates. At maximum throughput rates, the AD7904/AD7914/

AD7924 consume 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

coding. The AD7904/AD7914/AD7924 each feature four single-

ended analog inputs with a channel sequencer to allow a pre-

programmed selection of channels to be converted sequentially.

The conversion time for the AD7904/AD7914/AD7924 is

determined by the SCLK frequency, which is also used as the

master clock to control the conversion.

PRODUCT HIGHLIGHTS

1. High Throughput with Low Power Consumption.

The AD7904/AD7914/AD7924 offer throughput rates

up to 1 MSPS. At the maximum throughput rate with 3 V

supplies, the AD7904/AD7914/AD7924 dissipate 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.

The AD7904/AD7914/AD7924 operate from a single 2.7 V

face to connect directly to 3 V or 5 V processor systems,

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 parts also feature 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 parts feature a standard successive approximation

ADC with accurate control of the sampling instant via

the CS input and once-off conversion control.