a
AD7671
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16-Bit, 1 MSPS CMOS ADC
FUNCTIONAL BLOCK DIAGRAM
DGND
DVDD
AVDD AGND REF REFGND
SWITCHED
CAP DAC
CNVST
IMPULSE
WARP
OGND
16
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
IND(4R)
4R
OVDD
AD7671
INGND
PD
RESET
BYTESWAP
SER/
PAR
D[15:0]
BUSY
CS
RD
OB/
2C
SERIAL
PORT
PARALLEL
INTERFACE
INA(R)
R
INC(4R)
4R
INB(2R)
2R
FEATURES
Throughput
1 MSPS (Warp Mode)
800 kSPS (Normal Mode)
INL:
2.5 LSB Max ( 0.0038% of Full Scale)
16-Bit Resolution with No Missing Codes
S/(N+D): 90 dB Typ @ 250 kHz
THD: –100 dB Typ @ 250 kHz
Analog Input Voltage Ranges
Bipolar:
10 V,
5 V,
2.5 V
Unipolar: 0 V to 10 V, 0 V to 5 V, 0 V to 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
Power Dissipation
112 mW Typical
15
W @ 100 SPS
Power-Down Mode: 7
W Max
Package: 48-Lead Quad Flatpack (LQFP)
Package: 48-Lead Chip Scale (LFCSP)
Pin-to-Pin Compatible Upgrade of the AD7665/AD7664
APPLICATIONS
Data Acquisition
Communication
Instrumentation
Spectrum Analysis
Medical Instruments
Process Control
GENERAL DESCRIPTION
The AD7671 is a 16-bit, 1 MSPS, charge redistribution SAR,
analog-to-digital converter that operates from a single 5 V power
supply. It contains a high speed 16-bit sampling ADC, a resistor
input scaler that allows various input ranges, an internal
conversion clock, error correction circuits, and both serial
and parallel system interface ports.
The AD7671 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 features a very high sampling rate mode (Warp), a fast mode
(Normal) for asynchronous conversion rate applications, 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 and a tiny
48-lead LFCSP, with operation specified from –40
∞C to +85∞C.
PRODUCT HIGHLIGHTS
1. Fast Throughput
The AD7671 is a very high speed (1 MSPS in Warp Mode
and 800 kSPS in Normal Mode), charge redistribution, 16-bit
SAR ADC.
2. Single-Supply Operation
The AD7671 operates from a single 5 V supply, dissipates
only 112 mW typical, even lower when a reduced throughput
is used with the reduced power mode (Impulse) and a power-
down mode.
3. Superior INL
The AD7671 has a maximum integral nonlinearity of 2.5 LSB
with no missing 16-bit code.
4. Serial or Parallel Interface
Versatile parallel (8 bits or 16 bits) or 2-wire serial interface
arrangement compatible with both 3 V or 5 V logic.
PulSAR Selection
Type/kSPS
100–250
500–570
800–1000
Pseudo
AD7660
AD7650
Differential
AD7664
True Bipolar
AD7663
AD7665
AD7671
True Differential
AD7675
AD7676
AD7677
18-Bit
AD7678
AD7679
AD7674
Simultaneous/
AD7654
AD7655
Multichannel
REV. C
2012
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