AD7676_15 Datasheet, PDF (1/20 Pages) Analog Devices – 500 kSPS, Differential ADC

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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.
SPI and QSPI are trademarks of Motorola, Inc.
MIRCOWIRE is a trademark of National Semiconductor Corporation.
16-Bit, ؎1 LSB INL,
500 kSPS, Differential ADC
AD7676
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND REF REFGND
DVDD DGND
IN+
IN–
PD
RESET
AD7676
SWITCHED
CAP DAC
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
SERIAL
PORT
16
PARALLEL
INTERFACE
CNVST
OVDD
OGND
SER/PAR
BUSY
D[15:0]
CS
RD
OB/2C
BYTESWAP
Table I. PulSAR Selection
Type/kSPS
100–250
500–570
Pseudo Differential AD7660
AD7650
AD7664
True Bipolar
True Differential
18-Bit
AD7663
AD7675
AD7678
AD7665
AD7676
AD7679
Simultaneous/
Multichannel
AD7654
800–1000
AD7671
AD7677
AD7674
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.
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, 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.
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© Analog Devices, Inc., 2002