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16-Bit 1 MSPS PulSAR
Unipolar ADC with Reference
Data Sheet
AD7653
Rev. B Document Feedback
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FEATURES
Throughput:
1 MSPS (Warp mode)
800 kSPS (Normal mode)
666 kSPS (Impulse mode)
16-bit resolution
Analog input voltage range: 0 V to 2.5 V
No pipeline delay
Parallel and serial 5 V/3 V interface
SPI
®/QSPI
TM
/MICROWIRE
TM
/DSP compatible
Single 5 V supply operation
Power dissipation
92 mW typ @ 666 kSPS, 138 µW @ 1 kSPS without REF
128 mW typ @ 1 MSPS with REF
48-lead LQFP and 48-lead LFCSP packages
Pin-to-pin compatible with PulSAR ADCs
APPLICATIONS
Data acquisition
Instrumentation
Digital signal processing
Spectrum analysis
Medical instruments
Battery-powered systems
Process control
GENERAL DESCRIPTION
The AD7653 is a 16-bit, 1 MSPS, charge redistribution SAR
analog-to-digital converter that operates from a single 5 V
power supply. The part contains a high speed 16-bit sampling
ADC, internal conversion clock, internal reference, error
correction circuits, and both serial and parallel system interface
ports. It features a very high sampling rate mode (Warp), a fast
mode (Normal) for asynchronous conversion rate applications,
and a reduced power mode (Impulse) for low power applica-
tions where power is scaled with the throughput. The AD7653
is fabricated using Analog Devices’ high performance, 0.6
micron CMOS process, with correspondingly low cost. It is
available in a 48-lead LQFP and a tiny 48-lead LFCSP with
operation specified from –40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
02966-0-001
SWITCHED
CAP DAC
16
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7653
DATA[15:0]
BUSY
RD
CS
SER/PAR
OB/2C
OGND
OVDD
DGNDDVDD
AVDD
AGND
REF REFGND
IN
INGND
PD
RESET
SERIAL
PORT
PARALLEL
INTERFACE
CNVSTWARP IMPULSE
REF
REFBUFIN
PDBUF
PDREF
BYTESWAP
Figure 1.
Table 1. PulSAR™ Selection
Type/kSPS 100–250 500–570
800–
1000
Pseudo-
Differential
AD7651
AD7660/AD7661
AD7650/AD7652
AD7664/AD7666
AD7653
AD7667
True Bipolar AD7663 AD7666 AD7671
True
Differential
AD7675
AD7676
AD7677
18-Bit AD7678 AD7679 AD7674
Multichannel/
Simultaneous
AD7654
AD7655
PRODUCT HIGHTLIGHTS
1. Fast Throughput.
The AD7653 is a 1 MSPS, charge redistribution, 16-bit SAR
ADC with internal error correction circuitry.
2. Internal Reference.
The AD7653 has an internal reference with a typical
temperature drift of 7 ppm/°C.
3. Single-Supply Operation.
The AD7653 operates from a single 5 V supply. In Impulse
mode, its power dissipation decreases with the throughput.
4. Serial or Parallel Interface.
Versatile parallel or 2-wire serial interface arrangement is
compatible with both 3 V and 5 V logic.
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