Datasheet AD7989-1, AD7989-5 (Analog Devices)

18-Bit, 100 kSPS/500 kSPS PulSAR ADCs in MSOP/LFCSP Data Sheet AD7989-1 /AD7989-5 FEATURES GENERAL DESCRIPTION Low power dissipation
The AD7989-1/AD7989-5 are 18-bit, successive approximation,
AD7989-1
analog-to-digital converters (ADCs) that operate from a single
400 μW at 100 kSPS typical (VDD only)
power supply, VDD. The AD7989-1/AD7989-5 contain a low
700 μW at 100 kSPS typical (total)
power, high speed, 18-bit sampling ADC and a versatile serial
AD7989-5
interface port. On the CNV rising edge, the AD7989-1/AD7989-5
2 mW at 500 kSPS typical (VDD only)
sample the voltage difference between the IN+ and IN− pins.
3.5 mW at 500 kSPS typical (total)
The voltages on these pins typically swing in opposite phases
18-bit resolution with no missing codes
between 0 V and VREF. The reference voltage, VREF, is applied
Throughput
externally and can be set independent of the supply voltage,
AD7989-1
VDD. Its power scales linearly with throughput.
100 kSPS
The AD7989-1/AD7989-5 are serial peripheral interface (SPI)-
AD7989-5
compatible, which features the ability, using the SDI/CS input,
500 kSPS
to daisy-chain several ADCs on a single 3-wire bus. The
INL: ±1 LSB typical, 2 LSB maximum
AD7989-1/AD7989-5 are compatible with 1.8 V, 2.5 V, 3 V, and
SNR: 98 dB at 1 kHz, VREF = 5 V typical
5 V logic, using the separate VIO supply.
SINAD: 97 dB at 1 kHz typical THD: −120 dB at 10 kHz typical
The AD7989-1/AD7989-5 are available in a 10-lead MSOP or a
Dynamic range: 99 dB at VREF = 5 V typical
10-lead LFCSP with operation specified from −40°C to +85°C.
True differential analog input voltage range: ±VREF Table 1. MSOP and LFCSP 14-/16-/18-Bit PulSAR® ADCs 0 V to VREF with VREF between 2.4 V and 5.1 V Bits 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS No pipeline delay
181 AD7989-12 AD76912 AD76902 AD79822
Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and 5 V
AD7989-52 AD79842
logic interface
161 AD7684 AD76872 AD76882 AD79152
Proprietary serial interface SPI-/QSPI™-/MICROWIRE™-/
AD76932
DSP-compatible1
AD79162
Ability to daisy-chain multiple ADCs
163 AD7680 AD76852 AD76862 AD79802
10-lead MSOP and 3 mm × 3 mm 10-Lead LFCSP
AD7683 AD7694 AD7988-52 AD79832 AD7988-12
APPLICATIONS
143 AD7940 AD79422 AD79462
Battery-powered equipment
1 True differential.
Data acquisition systems
2 Pin for pin compatible.
Medical instruments
3 Pseudo differential.
Seismic data acquisition systems TYPICAL APPLICATIONS CIRCUIT 2.5V TO 5V 2.5V REF VDD VIO 1.8V TO 5.5V IN+ SDI/CS 3- OR 4-WIRE AD7989-1/ SCK INTERFACE ±10V, ±5V, .. AD7989-5 IN– SDO (SPI, CS, GND CNV ADA4941-1 DAISY CHAIN)
001 10232- Figure 1. 1 Protected by U.S. Patent 6,703,961.
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Document Outline Features Applications General Description Typical Applications Circuit Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Inputs Driver Amplifier Choice Single-Ended to Differential Driver Voltage Reference Input Power Supply Digital Interface CSB Mode, 3-Wire CSB Mode, 4-Wire Chain Mode Applications Information Interfacing to Blackfin® DSP Layout Evaluating AD7989-1/AD7989-5 Performance Outline Dimensions Ordering Guide