Datasheet AD7988-1, AD7988-5 (Analog Devices)

16-Bit Lower Power PulSAR ADCs in MSOP/LFCSP Data Sheet AD7988-1/ AD7988-5 FEATURES GENERAL DESCRIPTION Low power dissipation
The AD7988-1/AD7988-51 are 16-bit, successive approximation,
AD7988-1
analog-to-digital converters (ADC) that operate from a single
400 µW at 100 kSPS (VDD only)
power supply, VDD. The AD7988-1 offers a 100 kSPS throughput,
700 µW at 100 kSPS (total)
and the AD7988-5 offers a 500 kSPS throughput. They are low
AD7988-5
power, 16-bit sampling ADCs with a versatile serial interface
2 mW at 500 kSPS (VDD only)
port. On the CNV rising edge, they sample an analog input,
3.5 mW at 500 kSPS (total)
IN+, between 0 V to VREF with respect to a ground sense, IN−.
16-bit resolution with no missing codes
The reference voltage, REF, is applied external y and can be set
Throughput: 100 kSPS/500 kSPS options
independent of the supply voltage, VDD.
INL: ±0.6 LSB typical, ±1.25 LSB maximum
The SPI-compatible serial interface also features the ability to
SINAD: 91.5 dB at 10 kHz
daisy-chain several ADCs on a single 3-wire bus using the SDI
THD: −114 dB at 10 kHz
input. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using
Pseudo differential analog input range
the separate supply, VIO.
0 V to VREF with VREF from 2.5 V to 5.5 V No pipeline delay
The AD7988-1/AD7988-5 generics are housed in a 10-lead
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
MSOP or a 10-lead LFCSP with operation specified from −40°C
interface
to +125°C.
Proprietary SPI-/QSPI™-/MICROWIRE™-/DSP-compatible Table 1. MSOP, LFCSP 14-/16-/18-Bit PulSAR® ADCs serial interface Bits 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS Daisy-chain multiple ADCs
181
10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP, same space
AD7989-12 AD76912 AD76902 AD79822
as SOT-23
AD7989-52 AD79842
Wide operating temperature range: −40°C to +125°C
161 AD7684 AD76872 AD76882 AD79152 AD76932
APPLICATIONS
AD79162
Battery-powered equipment
163 AD7680 AD76852 AD76862 AD79802
Low power data acquisition systems
AD7683 AD7694 AD7988-52 AD79832
Portable medical instruments
AD7988-12
ATE equipment
143 AD7940 AD79422 AD79462
Data acquisitions
1 True differential.
Communications
2 Pin-for-pin compatible. 3 Pseudo differential.
TYPICAL APPLICATION CIRCUIT 2.5V TO 5V 2.5V REF VDD VIO 1.8V TO 5.5V 0V TO VREF SDI IN+ AD7988-1/ SCK 3- OR 4-WIRE INTERFACE AD7988-5 IN– SDO (SPI, DAISY CHAIN, CS) GND CNV
001 10231- Figure 1. 1 Protected by U.S. Patent 6,703,961.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE INPUT POWER SUPPLY DIGITAL INTERFACE MODE, 3-WIRE MODE 4-WIRE CHAIN MODE APPLICATIONS INFORMATION INTERFACING TO BLACKFIN® DSP LAYOUT EVALUATING THE PERFORMANCE OF THE AD7988-1/AD7988-5 OUTLINE DIMENSIONS ORDERING GUIDE