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14-Bit, 1 MSPS, Unipolar/Bipolar
Programmable Input PulSAR
®
ADC
Data Sheet
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
06396-001
14
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7951
DGND
DVDD
AVDD
AGND
REF REFGND
IN+
PD
RESET
CNVST
PDBUF
REFBUFIN
PDREF
REF
TEMP
D[13:0]
BUSY
RD
CS
OB/2C
OGND
OVDD
BYTES
WA
P
SER/PAR
REF
AMP
SERIAL DATA
PORT
PARALLEL
INTERFACE
SWITCHED
CAP DAC
VCC VEE
WARP
IMPULSE BIPOLAR
TEN
SERIAL
CONFIGURATION
PORT
IN–
Figure 1.
Table 1. 48-Lead 14-/16-/18-Bit PulSAR Selection
Type
100 kSPS to
250 kSPS
500 kSPS to
570 kSPS
570 kSPS to
1000 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
AD7621
AD7622
AD7623
18-Bit, True
Differential
AD7678 AD7679 AD7674
AD7641
AD7643
Multichannel/
Simultaneous
AD7654
AD7655
Rev. B
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