Texas Instruments ADS79 Series Manual

ADS79xx Pin Compatible, 12-, 10-, 8-Bit, 1-MSPS, 16-, 12-, 8-, 4-Channel, Single-Ended,

1 Features

• 1-MHz Sample Rate Serial Devices
1
• 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 and 0 to 2 x V
REF 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 μA)
• 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
High input
impedance PGA
(or non inverting
buffer such as
THS4031)
AINP
MXO
Ch0
Ch1
Ch2
(1)
Chn
REF5025
o/p
1
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.
Order
Product
Technical
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Documents
ADS7950, ADS7951, ADS7952, ADS7953, ADS7954, ADS7955
ADS7956, ADS7957, ADS7958, ADS7959, ADS7960, ADS7961
Serial Interface ADCs
PGA Gain
Control
GPIO1
GPIO2
GPIO3
GPIO0
high-alarm
low-alarm
To
ADC
SDO
Host
SDI
SCLK
CS
REF
10 µF
Support &
Tools &
Community
Software
SLAS605C – JUNE 2008 – REVISED JULY 2018

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 and 0 V to 2 × V
REF REF
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
TSSOP (30)
VQFN (24)
ADS79xx
TSSOP (38)
VQFN (32)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
), individually configurable
(1)
BODY SIZE (NOM)
7.80 mm × 4.40 mm
4.00 mm × 4.00 mm
9.70 mm × 4.40 mm
5.00 mm × 5.00 mm