16-Bit, 8-Channel Serial Output Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
a71 BIPOLAR INPUT RANGE
a71 PIN-FOR-PIN COMPATIBLE WITH THE
ADS7844 AND ADS8344
a71 SINGLE SUPPLY: 2.7V to 5V
a71 8-CHANNEL SINGLE-ENDED OR
4-CHANNEL DIFFERENTIAL INPUT
a71 UP TO 100kHz CONVERSION RATE
a71 85dB SINAD
a71 SERIAL INTERFACE
a71 QSOP-20 AND SSOP-20 PACKAGES
DESCRIPTION
The ADS8345 is an 8-channel, 16-bit, sampling
Analog-to-Digital (A/D) converter with a synchronous serial
interface. Typical power dissipation is 8mW at a 100kHz
throughput rate and a +5V supply. The reference voltage
(V
REF
) can be varied between 500mV and V
CC
/2, providing a
corresponding input voltage range of ±V
REF
. The device
includes a shutdown mode which reduces power dissipation
to under 15µW. The ADS8345 is ensured down to 2.7V
operation.
Low-power, high-speed, and an onboard multiplexer make
the ADS8345 ideal for battery-operated systems such as
personal digital assistants, portable multi-channel data log-
gers, and measurement equipment. The serial interface also
provides low-cost isolation for remote data acquisition. The
ADS8345 is available in a QSOP-20 or SSOP-20 package
and is ensured over the –40°C to +85°C temperature range.
CDAC
SAR
Comparator
8-Channel
Multiplexer
Serial
Interface
and
Control
CH4
CH5
CH6
CH7
COM
V
REF
CS
SHDN
D
IN
D
OUT
BUSY
DCLK
CH0
CH1
CH2
CH3
®AD
S
83
45
®ADS8345
ADS8345
SBAS177C – FEBRUARY 2001 – REVISED APRIL 2003
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2001-2003, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
APPLICATIONS
a71 DATA ACQUISITION
a71 TEST AND MEASUREMENT EQUIPMENT
a71 INDUSTRIAL PROCESS CONTROL
a71 PERSONAL DIGITAL ASSISTANTS
a71 BATTERY-POWERED SYSTEMS