16-Bit 100 kSPS PulSARTM
Unipolar ADC with Reference
AD7651
FEATURES
FUNCTIONAL BLOCK DIAGRAM
REFBUFIN
Throughput: 100 kSPS
REF REFGND
DVDD DGND
16-bit resolution
Analog input voltage range: 0 V to 2.5 V
No pipeline delay
OVDD
OGND
AGND
AVDD
AD7651
SERIAL
PORT
REF
Parallel and serial 5 V/3 V interface
16
IN
SWITCHED
CAP DAC
DATA[15:0]
BUSY
SPI®/QSPITM/MICROWIRETM/DSP compatible
Single 5 V supply operation
Power dissipation
16 mW typ, 160 µW @ 1 kSPS without REF
38 mW typ with REF
INGND
PARALLEL
INTERFACE
PDREF
PDBUF
RD
CLOCK
CS
PD
CONTROL LOGIC AND
SER/PAR
RESET
CALIBRATION CIRCUITRY
OB/2C
48-lead LQFP and 48-lead LFCSP packages
Pin-to-pin compatible with PulSAR ADCs
BYTESWAP
CNVST
02964-0-001
APPLICATIONS
Data acquisition
Figure 1. Functional Block Diagram
Table 1. PulSAR Selection
Instrumentation
800–
1000
Digital signal processing
Spectrum analysis
Medical instruments
Battery-powered systems
Process control
Type/kSPS
100–250
500–570
Pseudo-
Differential
AD7651
AD7650/AD7652 AD7653
AD7660/AD7661 AD7664/AD7666 AD7667
True Bipolar
AD7663
AD7675
AD7665
AD7676
AD7671
AD7677
True
Differential
GENERAL DESCRIPTION
18-Bit
AD7678
AD7679
AD7654
AD7655
AD7674
The AD7651 is a 16-bit, 100 kSPS, 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, an internal conversion clock, internal reference, error
correction circuits, and both serial and parallel system inter-
face ports.
Multichannel/
Simultaneous
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD7651 is a 100 kSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
The AD7651 is fabricated using Analog Devices’ high perform-
ance, 0.6 micron CMOS process, with correspondingly low cost,
and is available in a 48-lead LQFP and a tiny 48-lead LFCSP
with operation specified from –40°C to +85°C.
2. Internal Reference.
The AD7651 has an internal reference with a typical
temperature drift of 7 ppm/°C.
3. Single-Supply Operation.
The AD7651 operates from a single 5 V supply. Its power
dissipation decreases with throughput.
4. Serial or Parallel Interface.
Versatile parallel or 2-wire serial interface arrangement is
compatible with both 3 V and 5 V logic.
Rev. 0
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