MXO
AINP
Ch0
Chn
(1)
Ch2
Ch1
High input
impedance PGA
(or non inverting
buffer such as
THS4031)
GPIO1
GPIO2
GPIO3
PGA Gain
Control
GPIO0
high-alarm
low-alarm
SDI
SCLK
CS
SDO
To
Host
REF
REF5025
o/p
10 µF
ADC
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ADS7950, ADS7951, ADS7952, ADS7953, ADS7954, ADS7955
ADS7956, ADS7957, ADS7958, ADS7959, ADS7960, ADS7961
SLAS605C – JUNE 2008 – REVISED JULY 2018
ADS79xx Pin Compatible, 12-, 10-, 8-Bit, 1-MSPS, 16-, 12-, 8-, 4-Channel, Single-Ended,
Serial Interface ADCs
1
1 Features
1
•
1-MHz Sample Rate Serial Devices
•
Product Family of 12-, 10-, 8-Bit Resolution
•
Zero Latency
•
20-MHz Serial Interface
•
Analog Supply Range: 2.7 to 5.25 V
•
I/O Supply Range: 1.7 to 5.25 V
•
Two SW Selectable Unipolar, Input Ranges: 0 to
V
REF
and 0 to 2 x V
REF
•
Auto and Manual Modes for Channel Selection
•
4-, 8-Channel Devices and 12-, 16-Channel
Devices Share the Same Footprint
•
Two Programmable Alarm Levels per Channel
•
Four Individually Configurable GPIOs in TSSOP
Package: One GPIO in VQFN Package
•
Typical Power Dissipation: 14.5 mW (+VA = 5 V,
+VBD = 3 V) at 1 MSPS
•
Power-Down Current (1
μ
A)
•
Input Bandwidth (47 MHz at 3 dB)
•
38-, 30-Pin TSSOP and 32-, 24-Pin VQFN
Packages
2 Applications
•
PLC/IPC
•
Optical Line Card Monitoring
•
Medical Instrumentation
•
Digital Power Supplies
•
Multi-Channel, General-Purpose Signal Monitoring
•
High-Speed Data Acquisition Systems
•
High-Speed Closed-Loop Systems
Detailed Block Diagram
3 Description
The ADS79xx is a 12-, 10-, 8-bit pin compatible
multichannel analog-to-digital converter family. The
device comparison table shows all twelve devices
from this product family.
The devices include a capacitor based SAR A/D
converter with inherent sample and hold.
The devices accept a wide analog supply range from
2.7 V to 5.25 V. Very low power consumption makes
these
devices
suitable
for
battery-powered
and
isolated power-supply applications.
A wide 1.7-V to 5.25-V I/O supply range facilitates a
glueless interface with the most commonly used
digital hosts. The serial interface is controlled by CS
and SCLK for easy connection with microprocessors
and DSP.
The input signal is sampled with the falling edge of
CS. It uses SCLK for conversion, serial data output,
and reading serial data in. The devices allow auto
sequencing
of
preselected
channels
or
manual
selection of a channel for the next conversion cycle.
There are two software selectable input ranges (0 V
to V
REF
and 0 V to 2 × V
REF
), individually configurable
GPIOs (four in case of the TSSOP and one on the
VQFN package devices), and two programmable
alarm thresholds per channel. These features make
the
devices
suitable
for
most
data
acquisition
applications.
The devices offer an attractive power-down feature.
This is extremely useful for power saving when the
device is operated at lower conversion speeds.
The 16-, 12-channel devices from this family are
available in a 38-pin TSSOP and 32 pin VQFN
package and the 4/8-channel devices are available in
a 30-pin TSSOP and 24 pin VQFN packages.
Device Information
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS79xx
TSSOP (30)
7.80 mm × 4.40 mm
VQFN (24)
4.00 mm × 4.00 mm
TSSOP (38)
9.70 mm × 4.40 mm
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
