AD7982BRMZ Datasheet, PDF (1/24 Pages) Analog Devices – 18-Bit, 1 MSPS PulSAR 7.0 mW

FEATURES
18-bit resolution with no missing codes
Throughput: 1 MSPS
Low power dissipation
7.0 mW at 1 MSPS
70 μW at 10 kSPS
INL: ±1 LSB typical, ±2 LSB maximum
Dynamic range: 99 dB
True differential analog input range: ±VREF
0 V to VREF with VREF between 2.5 V to 5.0 V
Allows use of any input range
Easy to drive with the ADA4941
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
Ability to daisy-chain multiple ADCs and busy indicator
10-lead package: MSOP (MSOP-8 size) and 3 mm × 3 mm QFN
(LFCSP), SOT-23 size
APPLICATIONS
Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems
18-Bit, 1 MSPS PulSAR 7.0 mW
ADC in MSOP/QFN
AD7982
APPLICATION DIAGRAM EXAMPLE
2.5V TO 5V 2.5V
±10V, ±5V, ..
ADA4941
REF VDD ^VIO
IN+
SDI
AD7982 SCK
IN–
GND
SDO
CNV
1.8V TO 5V
3- OR 4-WIRE
INTERFACE
(SPI, CS
DAISY CHAIN)
Figure 1.
GENERAL DESCRIPTION
The AD7982 is an 18-bit, successive approximation, analog-to-
digital converter (ADC) that operates from a single power supply,
VDD. It contains a low power, high speed, 18-bit sampling ADC
and a versatile serial interface port. On the CNV rising edge,
the AD7982 samples the voltage difference between the IN+
and IN− pins. The voltages on these pins usually 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. 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, and 5 V logic, using the separate VIO supply.
The AD7982 is available in a 10-lead MSOP or a 10-lead QFN
(LFCSP) with operation specified from −40°C to +85°C.
Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR® ADCs
Type
100 kSPS
250 kSPS
18-Bit True Differential
AD7691
16-Bit True Differential
AD7684
AD7687
16-Bit Pseudo Differential
14-Bit Pseudo Differential
AD7680
AD7683
AD7940
AD7685
AD7694
AD7942
400 kSPS to 500 kSPS
AD7690
AD7688
AD7693
AD7686
AD7946
≥1000 kSPS
AD7982
AD7984
AD7980
ADC Driver
ADA4941
ADA4841
ADA4941
ADA4841
ADA4841
ADA4841
Rev. A
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