REV. PrA
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD7667
*
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 © Analog Devices, Inc., 2002
16-Bit 1 MSPS SAR Unipolar ADC with Ref
FUNCTIONAL BLOCK DIAGRAM
SWITCHED
CAP DAC
16
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7667
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
CNVSTWARP IMPULSE
2.5 V REF
PDREF
PDBUF
REFBUFIN
BYTESWAP
FEATURES
Throughput:
1 MSPS (Warp Mode)
800 kSPS (Normal Mode)
INL: ±2.5 LSB Max (±0.0038% of Full Scale)
16 Bits Resolution with No Missing Codes
Analog Input Voltage Range: 0 V to 2.5 V
No Pipeline Delay
Parallel and Serial 5 V/3 V Interface
SPI
TM
/QSPI
TM
/MICROWIRE
TM
/DSP Compatible
Single 5 V Supply Operation
Power Dissipation
112 mW Typ without REF, 122 mW Typ with REF
15 H9262W @ 100 SPS
Power-Down Mode: 7 H9262W Max
Package: 48-Lead Quad Flat Pack (LQFP);
48-Lead Chip Scale Package (LFCSP);
Pin-to-Pin Compatible with PulSAR ADCs
APPLICATIONS
Data Acquisition
Instrumentation
Digital Signal Processing
Spectrum Analysis
Medical Instruments
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) 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.
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.
PRODUCT HIGHLIGHTS
1. Fast Throughput
The AD7667 is a 1 MSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
2. Internal Reference
The AD7667 has an internal reference and allows for an
external reference to be used.
3. Superior INL
The 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.
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
Pseudo AD7651 AD7650/52 AD7653
Differential AD7660/61 AD7664/66 AD7667
True Bipolar AD7663 AD7665 AD7671
True AD7675 AD7676 AD7677
Differential
Type / kSPS 100 - 250 500 - 570 1000
PulSAR Selection