Datasheet

18-Bit, 1 MSPS PulSAR 7.0 mW
ADC in MSOP/QFN
Data Sheet
AD7982
Rev. B Document Feedback
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FEATURES
18-bit resolution with no missing codes
Throughput: 1 MSPS
Low power dissipation
4 mW at 1 MSPS (VDD only)
7 mW at 1 MSPS (total)
70 μW at 10 kSPS
INL: ±1 LSB typical, ±2 LSB maximum
Dynamic range: 99 dB
True differential analog input range: ±V
REF
0 V to V
REF
with V
REF
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
APPLICATION DIAGRAM EXAMPLE
AD7982
REF
GND
VDD
IN+
IN–
VIO
SDI
SCK
SDO
CNV
1.8V TO 5V
ADA4941
3- OR 4-WIRE
INTERFACE
(SPI, CS
DAISY CHAIN)
2.5V TO 5
V
2.5
V
06513-001
±
10V, ±5V, ..
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. e voltages on these pins usually swing in
opposite phases between 0 V and V
REF
. 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 400 kSPS to 500 kSPS ≥1000 kSPS ADC Driver
18-Bit True Differential AD7691 AD7690 AD7982 ADA4941
AD7984 ADA4841
16-Bit True Differential AD7684 AD7687 AD7688 ADA4941
AD7693 ADA4841
16-Bit Pseudo Differential AD7680 AD7685 AD7686 AD7980 ADA4841
AD7683 AD7694
14-Bit Pseudo Differential AD7940 AD7942 AD7946 ADA4841

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