16-Bit, ꢀ1 LSB INL,
a
500 kSPS, Differential ADC
AD7676*
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Throughput: 500 kSPS
AVDD AGND REF REFGND
DVDD DGND
INL: ꢀ1 LSB Max (ꢀ0.0015% of Full Scale)
16-Bit Resolution with No Missing Codes
S/(N+D): 94 dB Typ @ 45 kHz
OVDD
OGND
AD7676
THD: –110 dB Typ @ 45 kHz
Differential Input Range: ꢀ2.5 V
Both AC and DC Specifications
SERIAL
PORT
IN+
IN–
SWITCHED
CAP DAC
SER/PAR
BUSY
D[15:0]
CS
No Pipeline Delay
16
Parallel (8 Bits/16 Bits) and Serial 5 V/3 V Interface
SPI™/QSPI™/MICROWIRE™/DSP Compatible
Single 5 V Supply Operation
67 mW Typical Power Dissipation, 15 ꢁW @ 100 SPS
Power-Down Mode: 7 ꢁW Max
PARALLEL
INTERFACE
CLOCK
PD
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
RD
RESET
OB/2C
BYTESWAP
Packages: 48-Lead Quad Flatpack (LQFP)
48-Lead Frame Chip Scale (LFCSP)
Pin-to-Pin Compatible with the AD7675
CNVST
Table I. PulSAR Selection
APPLICATIONS
CT Scanners
Type/kSPS
100–250
500–570
800–1000
Data Acquisition
Instrumentation
Spectrum Analysis
Medical Instruments
Battery-Powered Systems
Process Control
Pseudo Differential
AD7660
AD7650
AD7664
True Bipolar
True Differential
18-Bit
AD7663
AD7675
AD7678
AD7665
AD7676
AD7679
AD7654
AD7671
AD7677
AD7674
Simultaneous/
Multichannel
GENERAL DESCRIPTION
The AD7676 is a 16-bit, 500 kSPS, charge redistribution SAR,
fully differential analog-to-digital converter (ADC) that oper-
ates 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.
PRODUCT HIGHLIGHTS
1. Excellent INL
The AD7676 has a maximum integral nonlinearity of 1.0 LSB
with no missing 16-bit code.
The AD7676 is hardware factory-calibrated and is comprehen-
sively tested to ensure such ac parameters as signal-to-noise ratio
(SNR) and total harmonic distortion (THD), in addition to the
more traditional dc parameters of gain, offset, and linearity.
2. Superior AC Performances
The AD7676 has a minimum dynamic of 92 dB, 94 dB typical.
3. Fast Throughput
The AD7676 is a 500 kSPS, charge redistribution, 16-bit
It is fabricated using Analog Devices’ high performance, 0.6 micron
CMOS process and is available in a 48-lead LQFP or a tiny
48-lead LFCSP with operation specified from –40°C to +85°C.
SAR ADC with internal error correction circuitry.
4. Single-Supply Operation
The AD7676 operates from a single 5 V supply and typically
dissipates only 67 mW. It consumes 7 µW maximum when in
power-down.
5. Serial or Parallel Interface
*Patent pending
Versatile parallel (8 bits or 16 bits) or 2-wire serial interface
arrangement compatible with either 3 V or 5 V logic.
SPI and QSPI are trademarks of Motorola, Inc.
MIRCOWIRE is a trademark of National Semiconductor Corporation.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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Tel: 781/329-4700
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www.analog.com
© Analog Devices, Inc., 2002