PRELIMINARYTECHNICALDATA
a
16-Bit 1 MSPS SAR Unipolar ADC with Ref
AD7667*
Preliminary Technical Data
FEATURES
F U N C T IO N AL BLO C K D IAG RAM
Throughput:
1 MSPS (Warp Mode)
800 kSPS (Normal Mode)
INL: 2.ꢀ LSB Max ( 0.0038ꢁ of Full Scale)
16 Bits Resolution with No Missing Codes
Analog Input Voltage Range: 0 V to 2.ꢀ V
No Pipeline Delay
REFBUFIN REF REFGND
DVDD DGND
AGND
AVDD
OVDD
OGND
AD7667
2.5 V REF
SERIAL
PORT
16
IN
SWITCHED
CAP DAC
DATA[15:0]
BUSY
INGND
Parallel and Serial ꢀ V/3 V Interface
SPITM/QSPITM/MICROWIRETM/DSP Compatible
Single ꢀ V Supply Operation
Power Dissipation
112 mW Typ without REF, 122 mW Typ with REF
1ꢀ ꢀW @ 100 SPS
PARALLEL
INTERFACE
PDREF
RD
PDBUF
PD
CLOCK
CS
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
SER/PAR
RESET
OB/2C
BYTESWAP
Power-Down Mode: 7 ꢀW Max
Package: 48-Lead Quad Flat Pack (LQFP);
48-Lead Chip Scale Package (LFCSP);
Pin-to-Pin Compatible with PulSAR ADCs
WARP IMPULSE CNVST
PulSAR Selection
APPLICATIONS
Data Acquisition
T ype / kSPS
100 - 250
500 - 570
1000
Instrumentation
Pseudo
Differential
AD7651
AD7660/61
AD7650/52
AD7664/66
AD7653
AD7667
Digital Signal Processing
Spectrum Analysis
Medical Instruments
Battery-Powered Systems
Process Control
T rue Bipolar
AD7663
AD7675
AD7665
AD7676
AD7671
AD7677
T rue
Differential
PRODUCT HIGHLIGHTS
1. Fast T hroughput
GENERAL DESCRIPT ION
T he AD7667 is a 1 MSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
T he AD7667 is a 16-bit, 1 MSPS, charge redistribution SAR,
analog-to-digital converter that operates from a single 5 V
power supply. T he 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.
2. Internal Reference
The AD7667 has an internal reference and allows for an
external reference to be used.
3. Superior INL
It features a very high sampling rate mode (Warp) and, for
asynchronous conversion rate applications, a fast mode
(Normal) and, for low power applications, a reduced power
mode (Impulse) where the power is scaled with the through-
put.
T he AD7667 has a maximum integral nonlinearity of 2.5
LSB with no missing 16-bit code.
4. Single-Supply Operation
The AD7667 operates from a single 5 V supply and dissipates
a typical of 112 mW. In impulse mode, its power dissi-
pation decreases with the throughput. It consumes 7 µW
maximum when in power-down.
It is fabricated using Analog Devices’ high-performance, 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 speci-
fied from –40°C to +85°C.
5. Serial or Parallel Interface
Versatile parallel or 2-wire serial interface arrangement
compatible with both 3 V or 5 V logic.
*Patent pending.
SPI and QSPI are trademarks of Motorola Inc.
MICROWIRE ia a trademark of National Semiconductor Corporation
REV. PrA
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties that
m ay result from its use. No license is granted by im plication or otherwise
under any patent or patent rights of Analog Devices.
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Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002