16-Bit, 1.33 MSPS PulSAR
®
ADC
AD7623
Rev. 0
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FEATURES
Throughput: 1.33 MSPS
2.048 V internal reference
Differential input range: ±V
REF
(V
REF
up to 2.5 V)
INL: ±1 LSB typical
16-bit resolution with no missing codes
SINAD: 88 dB typical @ 100 kHz
THD: −97 dB typical @ 100 kHz
No pipeline delay (SAR architecture)
Parallel (16- or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
2.5 V single-supply operation
Power dissipation: 45 mW typical @ 1.33 MSPS
48-lead LQFP and LFCSP_VQ packages
Speed upgrade of the AD7677
APPLICATIONS
Medical instruments
High speed data acquisition
Digital signal processing
Communications
Instrumentation
Spectrum analysis
ATE
FUNCTIONAL BLOCK DIAGRAM
05574-001
16
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7623
DGNDDVDD
AVDD
AGND
REF REFGND
IN+
IN–
PD
RESET
CNVST
PDBUF
REFBUFIN
PDREF
REF
TEMP
D[15:0]
BUSY
RD
CS
OB/2C
OGND
OVDD
BYTESWAP
SER/PAR
REF AMP
SERIAL
PORT
PARALLEL
INTERFACE
SWITCHED
CAP DAC
Figure 1.
Table 1. PulSAR Selection
Type/kSPS 100 to 250 500 to 570
800 to
1000
>1000
Pseudo
Differential
AD7651
AD7660/61
AD7650/52
AD7664/66
AD7653
AD7667
True Bipolar AD7663 AD7665 AD7671
True
Differential
AD7675 AD7676 AD7677 AD7621
AD7623
18-Bit AD7678 AD7679 AD7674 AD7641
Multichannel/
Simultaneous
AD7654 AD7655
GENERAL DESCRIPTION
The AD7623 is a 16-bit, 1.33 MSPS, charge redistribution SAR,
fully differential analog-to-digital converter (ADC) that
operates from a single 2.5 V power supply. It contains a high
speed 16-bit sampling ADC, an internal conversion clock, an
internal reference (and buffer), error correction circuits, and
both serial and parallel system interface ports. Power consump-
tion is automatically scaled with throughput, making it ideal
for battery-powered applications. It is available in 48-lead, low
profile quad flat package (LQFP) and a lead frame chip-scale
(LFCSP_VQ) package. Operation is specified from
−40°C to +85°C.
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD7623 is a 1.33 MSPS, charge redistribution,
16-bit SAR ADC.
2. Superior Linearity.
The AD7623 has no missing 16-bit code.
3. Internal Reference.
The AD7623 has a 2.048 V internal reference with a
typical drift of ±7 ppm/°C.
4. Single-Supply Operation.
The AD7623 operates from a 2.5 V single supply and
typically dissipates 45 mW. Its power dissipation decreases
with the throughput.
5. Serial or Parallel Interface.
Versatile parallel (16- or 8-bit bus) or 2-wire serial interface
arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.
