AD7951_15 Datasheet, PDF (1/32 Pages) Analog Devices – 14-Bit, 1 MSPS, Unipolar/Bipolar Programmable Input PulSAR

Data Sheet
14-Bit, 1 MSPS, Unipolar/Bipolar
Programmable Input PulSAR^® ADC
AD7951
FEATURES
Multiple pins/software programmable input ranges:
5 V, 10 V, ±5 V, ±10 V
Pins or serial SPI® compatible input ranges/mode selection
Throughput
1 MSPS (warp mode)
800 kSPS (normal mode)
670 kSPS (impulse mode)
14-bit resolution with no missing codes
INL: ±0.3 LSB typ, ±1 LSB max (±61 ppm of FSR)
SNR: 85 dB @ 2 kHz
iCMOS® process technology
5 V internal reference: typical drift 3 ppm/°C; TEMP output
No pipeline delay (SAR architecture)
Parallel (14- or 8-bit bus) and serial 5 V/3.3 V interface
SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
Power dissipation:
10 mW @ 100 kSPS
235 mW @ 1 MSPS
48-lead LQFP and LFCSP (7 mm × 7 mm) packages
APPLICATIONS
Process control
Medical instruments
High speed data acquisition
Digital signal processing
Instrumentation
Spectrum analysis
ATE
GENERAL DESCRIPTION
The AD7951 is a 14-bit, charge redistribution, successive
approximation register (SAR) architecture analog-to-digital
converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS
high voltage process. The device is configured through hardware or
via a dedicated write only serial configuration port for input
range and operating mode. The AD7951 contains a high speed
14-bit sampling ADC, an internal conversion clock, an internal
reference (and buffer), error correction circuits, and both serial
and parallel system interface ports. A falling edge on CNVST
samples the analog input on IN+ with respect to a ground
sense, IN−. The AD7951 features four different analog input
ranges and three different sampling modes: warp mode for the
fastest throughput, normal mode for the fastest asynchronous
throughput, and impulse mode where power is scaled with
throughput. Operation is specified from −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
TEMP REFBUFIN REF REFGND VCC VEE DVDD DGND
AGND
AVDD
PDREF
PDBUF
IN+
IN–
REF
REF
AMP
SWITCHED
CAP DAC
CNVST
PD
RESET
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
AD7951
SERIAL DATA
PORT
SERIAL
CONFIGURATION
PORT
14
PARALLEL
INTERFACE
OVDD
OGND
D[13:0]
SER/PAR
BYTESWAP
OB/2C
BUSY
RD
CS
WARP IMPULSE BIPOLAR TEN
Figure 1.
Table 1. 48-Lead 14-/16-/18-Bit PulSAR Selection
Type
100 kSPS to 500 kSPS to 570 kSPS to
250 kSPS
570 kSPS
1000 kSPS
Pseudo
Differential
AD7651
AD7660
AD7661
AD7650
AD7652
AD7664
AD7666
AD7653
AD7667
True Bipolar
AD7610
AD7663
AD7665
AD7951
AD7612
AD7671
True
Differential
AD7675
AD7676
AD7677
18-Bit, True
Differential
Multichannel/
Simultaneous
AD7678
AD7679
AD7654
AD7655
AD7674
>1000
kSPS
AD7621
AD7622
AD7623
AD7641
AD7643
Rev. A
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