AD7676 Datasheet, PDF (1/20 Pages) Analog Devices – 16-Bit +-1 LSB INL, 500 kSPS, Differential ADC

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FEATURES
Throughput: 500 kSPS
INL: ؎1 LSB Max (؎0.0015% of Full-Scale)
16 Bits 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 (8/16 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
Package: 48-Lead Quad Flat Pack (LQFP)
Pin-to-Pin Compatible with the AD7675
APPLICATIONS
CT Scanners
Data Acquisition
Instrumentation
Spectrum Analysis
Medical Instruments
Battery-Powered Systems
Process Control
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
DATA[15:0]
CS
RD
OB/2C
BYTESWAP
GENERAL DESCRIPTION
The AD7676 is a 16-bit, 500 kSPS, charge redistribution SAR,
fully differential 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.
The AD7676 is hardware factory calibrated and is comprehensively
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 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 or 16 bits) or 2-wire serial interface
arrangement compatible with either 3 V or 5 V logic.
*Patent pending
SPI and QSPI are trademarks of Motorola Inc.
MICROWIRE is a trademark of National Semiconductor Inc.
REV. 0
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© Analog Devices, Inc., 2001