AD7622BSTZ Datasheet, PDF (1/28 Pages) Analog Devices – 16-Bit, 1.5 LSB INL, 2 MSPS PulSAR ADC

16-Bit, 1.5 LSB INL, 2 MSPS PulSAR^® ADC
AD7622
FEATURES
Throughput
2 MSPS (wideband warp and warp mode)
1.5 MSPS (normal mode)
INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm of FSR)
16-bit resolution with no missing codes
Dynamic range: 92.5 dB typical
SINAD: 91 dB minimum @ 20 kHz (VREF = 2.5 V)
THD: −115 dB typical @ 20 kHz (VREF = 2.5 V)
2.048 V internal reference: typical drift 8 ppm/°C; TEMP output
Differential input range: ±VREF (VREF up to 2.5 V)
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
Single 2.5 V supply operation
Power dissipation
70 mW typical @ 2 MSPS with internal REF
2 μW in power-down mode
Pb-free, 48-lead LQFP and 48-lead LFCSP_VQ
Pin compatible with other PulSAR 48-lead ADCs
APPLICATIONS
Medical instruments
High speed data acquisition/high dynamic data acquisition
Digital signal processing
Spectrum analysis
Instrumentation
Communications
ATE
GENERAL DESCRIPTION
The AD7622 is a 16-bit, 2 MSPS, charge redistribution SAR,
fully differential, analog-to-digital converter (ADC) that
operates from a single 2.5 V power supply. The part 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. It features two
very high sampling rate modes (wideband warp and warp) and
a fast mode (normal) for asynchronous rate applications. The
AD7622 is hardware factory calibrated and tested to ensure ac
parameters, such as signal-to-noise ratio (SNR), in addition to
the more traditional dc parameters of gain, offset, and linearity.
The AD7622 is available in Pb-free only packages with
operation specified from −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
TEMP REFBUFIN REF REFGND
DVDD DGND
AGND
AVDD
IN+
IN–
PDREF
PDBUF
PD
RESET
REF
REF AMP
SWITCHED
CAP DAC
AD7622
SERIAL
PORT
16
PARALLEL
INTERFACE
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
OVDD
OGND
D[15:0]
SER/PAR
BUSY
RD
CS
OB/2C
BYTESWAP
WARP NORMAL CNVST
Figure 1.
Table 1. PulSAR 48-Lead ADC Selection
Type/kSPS
100 to
250
500 to
570
650 to
1000
Pseudo
Differential
AD7651,
AD7660,
AD7661
AD7650,
AD7652,
AD7664,
AD7666
AD7653,
AD7667
True Bipolar
AD7610, AD7665 AD7612,
AD7663
AD7671
True
Differential
AD7675 AD7676 AD7677
18-Bit
Multichannel/
Simultaneous
AD7631,
AD7678
AD7679
AD7654
AD7634,
AD7674
AD7655
>1000
AD7621,
AD7622,
AD7623
AD7641,
AD7643
1.50
POSITIVE INL = +0.43 LSB
NEGATIVE INL = –0.49 LSB
1.00
0.50
0
–0.50
–1.00
–1.50
0
16384
32768
CODE
49152
Figure 2. Integral Nonlinearity vs. Code
65536
Rev. 0
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