AD7650_15 Datasheet, PDF (1/20 Pages) Analog Devices – 16-Bit, 570 kSPS Low Cost CMOS ADC

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FEATURES
Throughput
570 kSPS (Warp Mode)
500 kSPS (Normal Mode)
16 Bits Resolution
Analog Input Voltage Range: 0 V to 2.5 V
No Pipeline Delay
Parallel and Serial 5 V/3 V Interface
SPI™/QSPI™/MICROWIRE™/DSP Compatible
Single 5 V Supply Operation
Power Dissipation
77 mW Typical @ 444 kSPS (Impulse Mode)
21 ␮W @ 100 SPS
Power-Down Mode: 7 ␮W Max
Package: 48-Lead Quad Flat Pack (LQFP) or 48-Lead
Frame Chip-Scale Pack (LFCSP)
Pin-to-Pin Compatible with PulSAR ADCs
APPLICATIONS
Data Acquisition
Instrumentation
Digital Signal Processing
Spectrum Analysis
Medical Instruments
Battery-Powered Systems
Process Control
16-Bit, 570 kSPS
Low Cost CMOS ADC
AD7650
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND REF REFGND
DVDD DGND
IN+
IN–
PD
RESET
AD7650
SWITCHED
CAP DAC
SERIAL
PORT
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
PARALLEL ₁₆
INTERFACE
OVDD
OGND
SER/PAR
BUSY
DATA[15:0]
CS
RD
OB/2C
WARP IMPULSE CNVST
GENERAL DESCRIPTION
The AD7650 is a 16-bit, 570 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, error correction circuits, and both
serial and parallel system interface 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 throughput.
It is fabricated using Analog Devices’ high-performance,
0.6 micron CMOS process and is available in a 48-lead LQFP
or in a tiny 48-lead Chip Scale package with operation specified
from –40°C to +85°C.
PRODUCT HIGHLIGHTS
1. Fast Throughput
The AD7650 is a 570 kSPS, charge redistribution, 16-bit
SAR ADC.
2. Single-Supply Operation
The AD7650 operates from a single 5 V supply. In impulse
mode, its power dissipation decreases with the throughput from
77 mW at 444 kSPS throughput to, for instance, only 21 µW
at a 100 SPS throughput. It consumes 7 µW maximum when
in power-down.
3. Serial or Parallel Interface
Versatile parallel or 2-wire serial interface arrangement com-
patible with both 3 V or 5 V logic.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. 0
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© Analog Devices, Inc., 2002