REV. B
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a
AD7676
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2002
16-Bit, 1 LSB INL,
500 kSPS, Differential ADC
FUNCTIONAL BLOCK DIAGRAM
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
OB/2C
16
D[15:0]
BUSY
CS
SER/PAR
OGND
OVDD
DGNDDVDD
SERIAL
PORT
PARALLEL
INTERFACE
BYTESWAP
RD
AV DD AGND REF REFGND
PD
RESET
CNVST
IN–
SWITCHED
CAP DAC
AD7676
IN+
Table I. PulSAR Selection
Type/kSPS 100–250 500–570 800–1000
Pseudo Differential AD7660 AD7650
AD7664
True Bipolar AD7663 AD7665 AD7671
True Differential AD7675 AD7676 AD7677
18-Bit AD7678 AD7679 AD7674
Simultaneous/ AD7654
Multichannel
FEATURES
Throughput: 500 kSPS
INL: 1 LSB Max (0.0015% of Full Scale)
16-Bit Resolution with No Missing Codes
S/(N+D): 94 dB Typ @ 45 kHz
THD: –110 dB Typ @ 45 kHz
Differential Input Range: 2.5 V
Both AC and DC Specifications
No Pipeline Delay
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
Packages: 48-Lead Quad Flatpack (LQFP)
48-Lead Frame Chip Scale (LFCSP)
Pin-to-Pin Compatible with the AD7675
APPLICATIONS
CT Scanners
Data Acquisition
Instrumentation
Spectrum Analysis
Medical Instruments
Battery-Powered Systems
Process Control
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.
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.
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.
PRODUCT HIGHLIGHTS
1. Excellent INL
The AD7676 has a maximum integral nonlinearity of 1.0 LSB
with no missing 16-bit code.
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
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
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.
