AD7888 Analog Devices Data Sheet Manual

2.7 V to 5.25 V, Micropower, 8-Channel, 125 k SPS, 12-Bit ADC in 16-Lead TSSOP

AD7888

FEATURES FUNCTIONAL BLOCK DIAGRAM

Specified for VDD of 2.7 V to 5.25

Flexible Power/Throughput Rate Management

AD7888

Shutdown Mode: 1
A Max AIN1

Eight Single-Ended Inputs MUX T/H

Serial Interface: SPI™/QSPI™/MICROWIRE™/DSP Compatible

16-Lead Narrow SOIC and TSSOP Packages REF

APPLICATIONS

REF IN/REF OUT BUF

Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications)

CHARGE

Instrumentation and Control Systems

REDISTRIBUTION High-Speed Modems DAC

SAR + ADC CONTROL LOGIC

AGND AGND

GENERAL DESCRIPTION

The AD7888 is a high speed, low power, 12-bit ADC that oper- SPORT

ates from a single 2.7 V to 5.25 V power supply. The AD7888 is capable of a 125 k SPS throughput rate. The input track-and-

CS SCLKDOUTDIN

hold acquires a signal in 500 ns and features a single-ended sampling scheme. The AD7888 contains eight single-ended analog inputs, AIN1 through AIN8. The analog input on each

PRODUCT HIGHLIGHTS

of these channels is from 0 to VREF. The part is capable of con- www.BDTIC.com/ DI

1. Smallest 12-bit 8-channel ADC; 16-lead TSSOP is the same

verting full power signals up to 2.5 MHz. area as an 8-lead SOIC and less than half the height. The AD7888 features an on-chip 2.5 V reference that can be 2. Lowest Power 12-bit 8-channel ADC. used as the reference source for the A/D converter. The REF

3. Flexible power management options including automatic

IN/REF OUT pin allows the user access to this reference. Alter-

power-down after conversion.

natively, this pin can be overdriven to provide an external refer-

ence voltage for the AD7888. The voltage range for this external 4. Analog input range from 0 V to VREF (VDD).

reference is from 1.2 V to VDD.

5. Versatile serial I/O port (SPI/QSPI/MICROWIRE/DSP CMOS construction ensures low power dissipation of typically Compatible).

2 m W for normal operation and 3 µW in power-down mode. The part is available in a 16-lead narrow body small outline (SOIC) and a 16-lead thin shrink small outline (TSSOP) package.

SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corporation.

REV. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com

under any patent or patent rights of Analog Devices. Fax: 781/326-8703 © Analog Devices, Inc., 2001