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Data Sheet
16-Bit, 1 MSPS/500 kSPS Differential PulSAR ADCs
AD7915/AD7916
FEATURES
High performance True differential analog input range: ±VREF 0 V to VREF with VREF between 2.5 V and 5 V Throughput: 1 MSPS/500 kSPS options Zero latency architecture 16-bit resolution with no missing codes INL: ±0.4 LSB typical, ±1 LSB maximum Dynamic range: 95.5 dB, VREF = 5 V SNR: 94 dB at fIN = 1 kHz, VREF = 5 V THD: −118.5 dB at fIN = 1 kHz, VREF = 5 V SINAD: 93.5 dB at fIN = 1 kHz, VREF = 5 V
Low power dissipation Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface AD7915: 4 mW at 1 MSPS (VDD only) 7 mW at 1 MSPS (total) AD7916: 2 mW at 500 kSPS (VDD only) 3.7 mW at 500 kSPS (total) 70 μW at 10 kSPS
Proprietary serial interface: SPI-/QSPI-/MICROWIRE™-/DSPcompatible1
10-lead packages: MSOP and 3 mm × 3 mm LFCSP Wide operating temperature range: −40°C to +125°C
APPLICATIONS
Automated test equipment Data acquisition systems Medical instruments
Machine automation
TYPICAL APPLICATIONS CIRCUIT
2.5V TO 5V 2.5V
±10V, ±5V, .. ADA4940-1
REF VDD VIO
IN+
SDI/CS
AD7915/ AD7916 IN–
GND
SCK SDO CNV
1.8V TO 5V
3- OR 4-WIRE INTERFACE (SPI, CS, DAISY CHAIN)
12583-001
Figure 1.
GENERAL DESCRIPTION
The AD7915/AD7916 are 16-bit, successive approximation, analog-to-digital converters (ADCs) that operate from a single power supply, VDD. They contain a low power, high speed, 16-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7915/AD7916 sample the voltage difference between the IN+ and IN− pins. The voltages on these pins typically swing in opposite phases between 0 V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. The power consumption of the AD7915/AD7916 scales linearly with throughput.
The AD7915/AD7916 are serial peripheral interface (SPI) compatible, which features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus. They are compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic using the separate VIO supply.
The AD7915/AD7916 are available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +125°C.
1 Protected by U.S. Patent 6,703,961.
Table 1. MSOP, LFCSP 16-/18-/20-Bit Precision Successive Approximation Register (SAR) ADCs and SAR ADC-Based Devices
Type
≤100 kSPS ≤250 kSPS ≤500 kSPS ≤1000 kSPS ≤2000 kSPS µModule® Data Acquisition Solutions
Differential
20-Bit
AD40221
AD40211
AD40201
18-Bit
AD7989-11 AD76911
AD40111
AD40071
AD40031
AD76901
AD79821
AD7989-51 AD79841
16-Bit
AD7684
AD76871
AD76881
AD40051
AD40011
AD76931
AD79151
AD79161
Pseudo-Differential
18-Bit
AD40101
AD40061
AD40021
16-Bit
AD7988-11 AD76851
AD40081
AD40041
AD40001
ADAQ7980
AD7680
AD7694
AD7988-51 AD79801
ADAQ7988
AD7683
AD76861
AD79831
1 Pin for pin compatible.
Rev. A
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AD7915/AD7916
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications ...................................................................................... 1 Typical Applications Circuit........................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications .................................................................................... 3
Timing Specifications .................................................................. 5 Absolute Maximum Ratings ........................................................... 7
Thermal Resistance ...................................................................... 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions........................... 8 Typical Performance Characteristics............................................. 9 Terminology.................................................................................... 13 Theory of Operation ...................................................................... 14 Circuit Information .............................