16-Bit, 750 kSPS, Unipolar/Bipolar
Programmable Input PulSAR® ADC
AD7612
FEATURES
FUNCTIONAL BLOCK DIAGRAM
TEMP REFBUFIN REF REFGND VCC VEE DVDD DGND
Multiple pins/software programmable input ranges:
5 V, 10 V, 5 V, 10 V
Pins or serial SPI®-compatible input ranges/mode selection
Throughput
750 kSPS (warp mode)
600 kSPS (normal mode)
OVDD
AGND
AD7612
REF
OGND
AVDD
PDREF
PDBUF
IN+
AMP
SERIAL DATA
PORT
REF
SERIAL
CONFIGURATION
PORT
16
SWITCHED
CAP DAC
D[15:0]
SER/PAR
BYTESWAP
OB/2C
BUSY
500 kSPS (impulse mode)
IN–
INL: 0.75 LSB typical, 1.5 LSB maximum ( 23 ppm of FSR)
16-bit resolution with no missing codes
SNR: 92 minimum (5 V) @ 2 kHz, 94 dB typical ( 10 V) @ 2 kHz
THD: −107 dB typical
PARALLEL
INTERFACE
CLOCK
CNVST
PD
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
RD
RESET
CS
iCMOS™ process technology
5 V internal reference: typical drift 3 ppm/°C; TEMP output
No pipeline delay (SAR architecture)
Parallel (16- or 8-bit bus) and serial 5 V/3.3 V interface
SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
Power dissipation: 190 mW @ 750 kSPS
Pb-free, 48-lead LQFP and LFCSP (7 mm × 7 mm) packages
WARP IMPULSE BIPOLAR TEN
Figure 1.
Table 1. 48-Lead 14-/16-/18-Bit PulSAR Selection
100 kSPS to
250 kSPS
500 kSPS to
570 kSPS
800 kSPS to
1000 kSPS
>1000
kSPS
Type
Pseudo
AD7651
AD7660
AD7661
AD7650
AD7652
AD7664
AD7666
AD7653
AD7667
Differential
APPLICATIONS
Process control
Medical instruments
High speed data acquisition
Digital signal processing
Instrumentation
True Bipolar
AD7663
AD7675
AD7665
AD7612
AD7671
True
AD7676
AD7677
AD7621
AD7622
AD7623
Differential
Spectrum analysis
ATE
18-Bit, True
Differential
AD7678
AD7679
AD7674
AD7641
AD7643
Multichannel/
Simultaneous
AD7654
AD7655
GENERAL DESCRIPTION
The AD7612 is a 16-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 AD7612 contains a high speed
16-bit sampling ADC, an internal conversion clock, an internal
reference (and buffer), error correction circuits, and both serial
PRODUCT HIGHLIGHTS
1. Programmable input range and mode selection.
Pins or serial port for selecting input range/mode select.
2. Fast throughput.
In warp mode, the AD7612 is 750 kSPS.
3. Superior Linearity.
No missing 16-bit code. 1.5 LSB max INL.
CNVST
and parallel system interface ports. A falling edge on
4. Internal Reference.
samples the analog input on IN+ with respect to a ground
sense, IN−. The AD7612 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 consumption is
scaled linearly with throughput. Operation is specified from
−40°C to +85°C.
5 V internal reference with a typical drift of 3 ppm/°C
and an on-chip temperature sensor.
5. Serial or Parallel Interface.
Versatile parallel (16- or 8-bit bus) or 2-wire serial interface
arrangement compatible with 3.3 V or 5 V logic.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
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