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AD7982 Datasheet, PDF (1/23 Pages) Analog Devices – 18-bit, 1 MSPS PulSAR ADC in MSOP/QFN
18-bit, 1 MSPS PulSAR™ ADC in MSOP/QFN
Preliminary Technical Data
18-bit resolution with no missing codes
Throughput: 1MSPS
Low Power dissipation: 7.5 mW @ 1MSPS, 75 μW @ 10kSPS
INL: ±1 LSB typ, ±2.5 LSB max
Dynamic range: 99 dB
True differential analog input range: ±VREF
0 V to VREF with VREF between 2.5V to 5.0V
Any input range and easy to drive with the ADA4941
No pipeline delay
Single-supply 2.5V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible
Daisy-chain multiple ADCs and BUSY indicator
10-lead package: MSOP (MSOP-8 size) and
QFN (LFCSP), 3 mm × 3 mm same space as SOT-23
APPLICATIONS
Battery-powered equipment
Data acquisitions
Instrumentation
Medical instruments
Seismic Data Acquisition Systems
Table 1. MSOP, QFN(LFCSP)/SOT-23 14, 16 and18-Bit ADC
Type
100
kSPS
250
kSPS
400-
500
kSPS
1000
kSPS
ADC
Driver
18Bit
AD76911 AD76901 AD79821 ADA4941
ADA4841
16Bit AD7680 AD76851 AD76861 AD79801 ADA4941
AD7683 AD76871 AD76881
ADA4841
AD7684 AD7694 AD76931
14Bit AD7940 AD79421 AD79461
1 Pin-for-pin compatible.
AD7982
APPLICATION DIAGRAM EXAMPLE
2.5 TO 5V 2.5V
±10V, ±5V, ..
ADA4941
REF VDD VIO
IN+
SDI
AD7982 SCK
IN–
GND
SDO
CNV
1.8 TO 5V
3- OR 4-WIRE
INTERFACE
(SPI, , CS
DAISY CHAIN)
Figure 1.
GENERAL DESCRIPTION
The AD7982 is a 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, it samples the voltage difference between IN+ and
IN− pins. The voltages on these pins usually swing in opposite
phase between 0 V and REF. The reference voltage, REF, is
applied externally and can be set independently 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, or 5 V logic, using the separate
supply VIO.
The AD7982 is housed in a 10-lead MSOP or a 10-lead QFN
(LFCSP) with operation specified from −40°C to +85°C.
Rev PrC
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