AD7981_17 Datasheet, PDF (1/26 Pages) Analog Devices – High Temperature, 16-Bit, 600 kSPS PulSAR ADC

Data Sheet
FEATURES
Extreme high temperature operation
Specified temperature range
−55°C to +210°C (10-lead FLATPACK)
−55°C to +175°C (10-Lead MSOP)
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: ±2.5 LSB maximum, DNL: ±0.9 LSB maximum
Low power
2.25 mW typical at 600 kSPS (VDD only)
4.65 mW typical at 600 kSPS (total)
75 µW typical at 10 kSPS
Small footprint
10-lead, 3 mm × 3 mm, monometallic wire bonding MSOP
10-lead, 0.255 mm × 0.255 mm, monometallic wire
bonding FLATPACK
Pseudo differential analog input range
0 V to VREF with VREF between 2.4 V and 5.1 V
Single-supply 2.5 V operation with 1.8 V to 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, PulSAR®
analog-to-digital converter (ADC) designed for high temperature
operation. The AD7981 is capable of sample rates of up to 600 kSPS
while maintaining low power consumption from a single power
supply, VDD. It is a fast throughput, high accuracy, high tempera-
ture, successive approximation register (SAR) ADC, 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. B
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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 speci-
fied from −55°C to +175°C and 10-lead ceramic flat package
(FLATPACK) with operation specified from −55°C to +210°C.
These packages are designed for robustness at extreme tempera-
tures, including monometallic wire bonding, and are 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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