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AD7665
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REV.
16-Bit, 570 kSPS CMOS ADC
FUNCTIONAL BLOCK DIAGRAM
DGNDDVDDAVDD AGND REF REFGND
SWITCHED
CAP DAC
CNVSTIMPULSEWARP
OGND
16
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
IND(4R)
4R
OVDD
AD7665
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
570 kSPS (Warp Mode)
500 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 @ 180 kHz
THD: –100 dB Typ @ 180 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
64 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 AD7664/AD7663
APPLICATIONS
Data Acquisition
Communication
Instrumentation
Spectrum Analysis
Medical Instruments
Process Control
GENERAL DESCRIPTION
The AD7665 is a 16-bit, 570 kSPS, 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 conver-
sion clock, error correction circuits, and both serial and parallel
system interface ports.
The AD7665 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.
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 AD7673 AD7674
Simultaneous/ AD7654
Multichannel
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 AD7665 is a very high speed (570 kSPS in Warp Mode
and 500 kSPS in Normal Mode), charge redistribution, 16-bit
SAR ADC.
2. Single-Supply Operation
The AD7665 operates from a single 5 V supply, dissipates
only 64 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 AD7665 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.
