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16-Bit 500 kSPS PulSAR
®
Unipolar ADC with Reference
AD7666
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
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
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
FEATURES
2.5 V internal reference: typical drift 3 ppm/°C
Guaranteed max drift 15 ppm/°C
Throughput: 500 kSPS
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
Both AC and DC specifications
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
66 mW typ, 132 µW @ 1 kSPS without REF
81 mW typ with REF
48-lead LQFP and 48-lead LFCSP packages
Pin-to-pin compatible with PulSAR ADCs
APPLICATIONS
Data acquisition
Medical instruments
Digital signal processing
Spectrum analysis
Instrumentation
Battery-powered systems
Process control
GENERAL DESCRIPTION
The AD7666 is a 16-bit, 500 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. The AD7666 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.
The AD7666 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
03034-0-001
SWITCHED
CAP DAC
16
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7666
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
CNVST
REF
REFBUFIN
PDBUF
PDREF
BYTESWAP
Figure 1. Functional Block Diagram
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 AD7665 AD7671
True
Differential
AD7675 AD7676 AD7677
18-Bit AD7678 AD7679 AD7674
Multichannel/
Simultaneous
AD7654
AD7655
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD7666 is a 500 kSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
2. Superior INL.
The AD7666 has a maximum integral nonlinearity of
2.0 LSB with no missing 16-bit codes.
3. Internal Reference.
The AD7666 has an internal reference with a typical
temperature drift of 3 ppm/°C.
4. Single-Supply Operation.
The AD7666 operates from a single 5 V supply. 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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