AD7981 Datasheet, PDF (1/25 Pages) Analog Devices – High Temperature, 16-Bit, 600 kSPS PulSAR ADC

Data Sheet
FEATURES
Extreme high temperature operation
Specified temperature range: −55°C to +175°C
High performance
16-bit resolution with no missing codes
600 kSPS throughput with no latency/pipeline delay
SNR: 91 dB typical at 1 kHz input frequency
THD: −102 dB typical at 1 kHz input frequency
INL: ±2.0 LSB maximum, DNL: ±0.9 LSB maximum
Low power dissipation
2.25 mW typical at 600 kSPS (VDD only)
4.65 mW typical at 600 kSPS (total)
70 µW typical at 10 kSPS
Small footprint
10-lead, 3 mm × 5 mm, monometallic wire bonding MSOP
Pseudo differential analog input range
0 V to VREF with VREF between 2.4 V and 5.1 V
Easy to use
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
SPI-/QSPI-/MICROWIRE-/DSP-compatible digital interface
Daisy-chain multiple ADCs and busy indicator
APPLICATIONS
Downhole drilling and instrumentation
Avionics
Heavy industrial
High temperature environments
GENERAL DESCRIPTION
The AD7981¹ is a 16-bit, successive approximation, analog-to-
digital converter (ADC) designed for high temperature operation.
The AD7981 is capable of sample rates up to 600 kSPS while
maintaining low power consumption from a single power supply,
VDD. It is a fast throughput, high accuracy, high temperature,
successive approximation register (SAR) ADC and packaged in
a small form factor with a versatile serial port interface (SPI).
On the CNV rising edge, the AD7981 samples an analog input,
IN+, between 0 V and REF with respect to a ground sense, IN−.
The reference voltage, REF, is applied externally and can be set
independent of the supply voltage, VDD. The device 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,
1 _{Protected by U.S. Patent 6,703,961.}
Rev. 0
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High Temperature, 16-Bit,
600 kSPS PulSAR^® ADC
AD7981
TYPICAL APPLICATION CIRCUIT
2.5V to 5.0V 2.5V
0V TO V_REF
REF VDD ^VIO
IN+
SDI
AD7981 ^SCK
IN–
SDO
GND
CNV
1.8V TO 5.0V
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
Figure 1.
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.
For space constrained applications, the AD7981 is available in a
10-lead mini small outline package (MSOP) with operation
specified from −55°C to +175°C. This package is designed for
robustness at extreme temperatures, including monometallic
wire bonding, and is qualified for up to 1000 hours of operation
at the maximum temperature rating.
The AD7981 is a member of a growing series of high temperature
qualified products offered by Analog Devices, Inc. For a complete
selection of available high temperature products, see the high
temperature product list and qualification data available at
www.analog.com/hightemp.
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