AD7667_15 Datasheet, PDF (1/28 Pages) Analog Devices – Unipolar ADC with Reference

FEATURES
2.5 V internal reference: typical drift 3 ppm/°C
Guaranteed max drift 15 ppm/°C
Throughput:
1 MSPS (Warp mode)
800 kSPS (Normal mode)
666 kSPS (Impulse mode)
INL: ±2.0 LSB max (±0.0038% of full scale)
16-bit resolution with no missing codes
S/(N+D): 88 dB min @ 20 kHz
THD: –96 dB max @ 20 kHz
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
87 mW typ @ 666 kSPS, 130 µW @ 1 kSPS without REF
133 mW typ @1 MSPS with REF
48-lead LQFP and 48-lead LFCSP packages
Pin-to-pin compatible with AD7671, AD7677
APPLICATIONS
Data acquisition
Medical instruments
Digital signal processing
Battery-powered systems
Process control
GENERAL DESCRIPTION
The AD7667 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, an internal conversion clock, internal reference, error
correction circuits, and both serial and parallel system inter-
face ports. It features a very high sampling rate mode (Warp), a
fast mode (Normal) for asynchronous applications, and a
reduced power mode (Impulse) for low power applications
where power is scaled with the throughput. The AD7667 is
hardware factory-calibrated and comprehensively tested to
ensure ac parameters such as signal-to-noise ratio (SNR) and
total harmonic distortion (THD) in addition to the more
traditional dc parameters of gain, offset, and linearity. Operation
is specified from –40°C to +85°C.
Rev. 0
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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
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16-Bit 1 MSPS PulSAR^®
Unipolar ADC with Reference
AD7667
FUNCTIONAL BLOCK DIAGRAM
REFBUFIN REF REFGND
DVDD DGND
AGND
AVDD
IN
INGND
PDREF
PDBUF
PD
RESET
AD7667
REF
SWITCHED
CAP DAC
SERIAL
PORT
16
CLOCK
PARALLEL
INTERFACE
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
WARP IMPULSE CNVST
Figure 1.
OVDD
OGND
DATA[15:0]
BUSY
RD
CS
SER/PAR
OB/2C
BYTESWAP
Table 1. PulSAR Selection
Type/kSPS
Pseudo-
Differential
True Bipolar
True
Differential
18-Bit
Multichannel/
Simultaneous
100–250
AD7651
AD7660/AD7661
AD7663
AD7675
AD7678
500–570
AD7650/AD7652
AD7664/AD7666
AD7665
AD7676
AD7679
AD7654
AD7655
800–
1000
AD7653
AD7667
AD7671
AD7677
AD7674
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD7667 is a 1 MSPS, charge redistribution, 16-bit SAR
ADC with internal error correction circuitry.
2. Superior INL.
The AD7667 has a maximum integral nonlinearity of
2.0 LSBs with no missing 16-bit codes.
3. Internal Reference.
The AD7667 has an internal reference with a typical
temperature drift of 3 ppm/°C.
4. Single-Supply Operation.
The AD7667 operates from a single 5 V supply. In Impulse
mode, its power dissipation decreases with throughput.
5. 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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