AD7980ARMZRL7;AD7980BCPZ-RL7;AD7980BRMZ;AD7980ACPZ-RL;AD7980

16-Bit, 1 MSPS PulSAR ADC in MSOP/QFN

AD7980

APPLICATION DIAGRAM EXAMPLE

FEATURES

16-bit resolution with no missing codes Throughput: 1 MSPS

Low power dissipation: 7.0 mW @ 1 MSPS, 70 μW @ 10 kSPS INL: ±0.6 LSB typical, ±1.25 LSB maximum SINAD: 91.25 dB @ 10 kHz THD: 110 dB @ 10 kHz

Pseudo differential analog input range

0 V to VREF with VREF between 2.5 V to 5.5 V

Any input range and easy to drive with the ADA4841 No pipeline delay

Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface

Serial interface SPI-/QSPI -/MICROWIRE -/DSP-compatible Daisy-chain multiple ADCs and busy indicator

10-lead MSOP and 10-lead, 3 mm × 3 mm, QFN (LFCSP), same space as SOT-23

Wide operating temperature range: 40°C to +125°C

06392-001

Figure 1.

GENERAL DESCRIPTION

The AD7980 is a 16-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 16-bit

sampling ADC and a versatile serial interface port. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN . The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput. The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus and provides an optional busy indicator. It is

compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.

The AD7980 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from 40°C to +125°C.

APPLICATIONS

Battery-powered equipment Communications ATE

Data acquisitions Medical instruments

Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR® ADC

Type 100 kSPS 250 kSPS AD76911 16-Bit AD7680 AD76851 AD7683 AD76871 AD7684 AD7694 14-Bit AD7940 AD79421

1

400 kSPS to 500 kSPS

AD76901

AD76861 AD76881 AD76931 AD79461 1000 kSPS AD79821

AD79801 ADC Driver ADA4941 ADA4841 ADA4941 ADA4841

Pin-for-pin compatible.

Rev. B

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AD7980

Driver Amplifier Choice ........................................................... 15 Voltage Reference Input ............................................................ 16 Power Supply ............................................................................... 16 Digital Interface .......................................................................... 16 CS Mode, 3-Wire, Without Busy Indicator ............................ 17 CS Mode 3-Wire with Busy Indicator ..................................... 18 CS Mode 4-Wire, Without Busy Indicator ............................. 19 CS Mode 4-Wire with Busy Indicator ..................................... 20 Chain Mode, Without Busy Indicator ..................................... 21 Chain Mode with Busy Indicator ............................................. 22 Application Hints ........................................................................... 23 Layout .......................................................................................... 23 Evaluating the Performance of the AD7980 ............................... 23 Outline Dimensions ....................................................................... 24 Ordering Guide .......................................................................... 25

TABLE OF CONTENTS

Features .............................................................................................. 1 Applications ....................................................................................... 1 Application Diagram Example........................................................ 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Timing Specifications ....................................................................... 5 Absolute Maximum Ratings ............................................................ 6 ESD Caution .................................................................................. 6 Pin Configurations and Function Descriptions ........................... 7 Terminology ...................................................................................... 8 Typical Performance Characteristics ............................................. 9 Theory of Operation ...................................................................... 13 Circuit Information .................................................................... 13 Converter Operation .................................................................. 13 Typical Connection Diagram ................................................... 14 Analog Input ............................................................................... 15

REVISION HISTORY

6/09—Rev. A to Rev. B