Datasheet Analog Devices AD7997

8-Channel, 10-and 12-Bit ADCs with I2CCompatible Interface in 20-Lead TSSOP
AD7997/AD7998
FEATURES FUNCTIONAL BLOCK DIAGRAM
VDD AGND REFIN CONVST AD7997/AD7998
VIN1
8:1
I/P
MUX T/H 10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC CONTROL
LOGIC OSCILLATOR VIN8 REGISTER CH1-CH4 CONVERSION
RESULT
REGISTER DATAHIGHLIMIT CONFIGURATION
REGISTER DATALOWLIMIT REGISTER CH1-CH4 ALERT/BUSY ALERT STATUS
REGISTER HYSTERESIS
REGISTER CH1-CH4 CYCLE TIMER
REGISTER AS
I2C INTERFACE SCL
SDA GENERAL DESCRIPTION
The AD7997/AD7998 are 8-channel, 10-and 12-bit, low power,
successive approximation ADCs with an I2C-compatible
interface. The parts operate from a single 2.7 V to 5.5 V power …

8 Channel, 12-/10-Bit ADCs with I2C
Compatible Interface in 20-Lead TSSOP
AD7998/AD7997 a
Errata Sheet Please be advised that it was necessary to change the pin-out diagram for the AD7998/AD7997 ADCs. Please
discard any pin-out information from AD7998/AD7997 data sheets up to and including Rev PrD.
Packaged material may be identified by the date code; parts with date code 0312 have the old pin-out and will be
no longer manufactured. All other date-coded material will be manufactured according to the new pin-out diagram
which is shown below. AGND 1 VDD 2 AGND 3 AGND 4 AD7998
TOP VIEW 20 AGND 19 SCL 18 SDA 17 ALERT
16 CONVST VDD 5 REFIN 6 15 AS VIN1 7 14 VIN2 VIN3 8 13 VIN4 VIN5 9 12 VIN7 10 11 VIN8 (Not to Scale) VIN6 REV. A Sept 2003
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2003 …