AD7888_10 Datasheet, PDF (1/17 Pages) Analog Devices – 2.7 V to 5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP

a 2.7 V to 5.25 V, Micropower, 8-Channel,
125 kSPS, 12-Bit ADC in 16-Lead TSSOP
AD7888
FEATURES
Specified for V_DD of 2.7 V to 5.25 V
Flexible Power/Throughput Rate Management
Shutdown Mode: 1 ␮A Max
Eight Single-Ended Inputs
Serial Interface: SPI™/QSPI™/MICROWIRE™/DSP
Compatible
16-Lead Narrow SOIC and TSSOP Packages
APPLICATIONS
Battery-Powered Systems (Personal Digital Assistants,
Medical Instruments, Mobile Communications)
Instrumentation and Control Systems
High-Speed Modems
FUNCTIONAL BLOCK DIAGRAM
AIN1
AIN8
I/P
MUX
T/H
AD7888
V_DD
2.5V
REF
COMP
REF IN/REF OUT
BUF
CHARGE
REDISTRIBUTION
DAC
GENERAL DESCRIPTION
The AD7888 is a high speed, low power, 12-bit ADC that oper-
ates from a single 2.7 V to 5.25 V power supply. The AD7888 is
capable of a 125 kSPS throughput rate. The input track-and-
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
of these channels is from 0 to V_REF. The part is capable of con-
verting full power signals up to 2.5 MHz.
The AD7888 features an on-chip 2.5 V reference that can be
used as the reference source for the A/D converter. The REF
IN/REF OUT pin allows the user access to this reference. Alter-
natively, this pin can be overdriven to provide an external refer-
ence voltage for the AD7888. The voltage range for this external
reference is from 1.2 V to V_DD.
CMOS construction ensures low power dissipation of typically
2 mW 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.
AGND
SAR + ADC
CONTROL LOGIC
SPORT
AGND
CS
DIN DOUT SCLK
PRODUCT HIGHLIGHTS
1. Smallest 12-bit 8-channel ADC; 16-lead TSSOP is the same
area as an 8-lead SOIC and less than half the height.
2. Lowest Power 12-bit 8-channel ADC.
3. Flexible power management options including automatic
power-down after conversion.
4. Analog input range from 0 V to V_REF (V_DD).
5. Versatile serial I/O port (SPI/QSPI/MICROWIRE/DSP
Compatible).
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. C
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