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

VREF and 0 to 2 x VREF

• 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

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 VREF and 0 V to 2 × VREF), 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.