ADS7950_15 Datasheet, PDF (1/70 Pages) Texas Instruments – Single-Ended, MicroPower, Serial Interface ADCs

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
ADS7950, ADS7951, ADS7952, ADS7953, ADS7954, ADS7955
ADS7956, ADS7957, ADS7958, ADS7959, ADS7960, ADS7961
SLAS605B – JUNE 2008 – REVISED JULY 2015
ADS79xx 12/10/8-Bit, 1 MSPS, 16/12/8/4-Channel, Single-Ended, MicroPower, Serial
Interface ADCs
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
2.5 V and 0 to 5 V
• Auto and Manual Modes for Channel Selection
• 12, 8, 4-Channel Devices can Share 16 Channel
Device Footprint
• Two Programmable Alarm Levels per Channel
• Four Individually Configurable GPIOs for TSSOP
package devices. One GPIO for QFN devices
• Typical Power Dissipation: 14.5 mW (+VA = 5 V,
+VBD = 3V) at 1 MSPS
• Power-Down Current (1 μA)
• Input Bandwidth (47 MHz at 3 dB)
• 38-,30-Pin TSSOP and 32-,24-Pin QFN Packages
2 Applications
• PLC / IPC
• Battery Powered Systems
• Medical Instrumentation
• Digital Power Supplies
• Touch Screen Controllers
• High-Speed Data Acquisition Systems
• High-Speed Closed-Loop Systems
Detailed Block Diagram
High input
impedance PGA
(or non inverting
buffer such as
THS4031)
Ch0
Ch1
Ch2
MXO
PGA Gain
Control
GPIO1
GPIO2
GPIO3
AINP
GPIO0
high-alarm
low-alarm
ADC
SDO
To
Host
Chn⁽¹⁾
SDI
SCLK
CS
REF
3 Description
The ADS79xx is a 12/10/8-bit multichannel analog-to-
digital converter family. The following 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
glue-less interface with the most commonly used
CMOS 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 2.5 V and 0 V to 5 V), four individually configurable
GPIOs ( in case of TSSOP 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⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TSSOP (30)
7.80 mm × 4.40 mm
ADS79xx
VQFN (24)
TSSOP (38)
4.00 mm × 4.00 mm
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.
REF5025
o/p
10 µF
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.