a
AD7660
16-Bit, 100 kSPS PulSAR
®
Unipolar CMOS ADC
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REV. E
FUNCTIONAL BLOCK DIAGRAM
SWITCHED
CAP DAC
16
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7660
D[15:0]
BUSY
RD
CS
SER/PAR
OB/2C
OGND
OVDD
DGNDDVDD
AVDD AGND REF REFGND
IN
INGND
PD
RESET
SERIAL
PORT
PARALLEL
INTERFACE
CNVST
FEATURES
Throughput: 100 kSPS
INL: 3 LSB Max (0.0046% of Full-Scale)
16-Bit Resolution with No Missing Codes
S/(N+D): 87 dB Min @ 10 kHz, 90 dB Typ @ 45 kHz
THD: –96 dB Max @ 10 kHz
Analog Input Voltage Range: 0 V to 2.5 V
Both AC and DC Specifications
No Pipeline Delay
Parallel and Serial 5 V/3 V Interface
SPI
®
/QSPI™/MICROWIRE™/DSP Compatible
Single 5 V Supply Operation
21 mW Typical Power Dissipation, 21 W @ 100 SPS
Power-Down Mode: 7 W Max
Package: 48-Lead Quad Flatpack (LQFP)
48-Lead Chip Scale Package (LFCSP)
Pin-to-Pin Compatible with the AD7664
APPLICATIONS
Data Acquisition
Battery-Powered Systems
PCMCIA
Instrumentation
Automatic Test Equipment
Scanners
Medical Instruments
Process Control
GENERAL DESCRIPTION
The AD7660 is a 16-bit, 100 kSPS, charge redistribution SAR,
analog-to-digital converter that operates from a single 5 V power
supply. The part contains an internal conversion clock, error cor-
rection circuits, and both serial and parallel system interface ports.
The AD7660 is hardware factory-calibrated and is comprehen-
sively tested to ensure ac parameters such 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 with correspondingly low cost 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 AD7660 is a 100 kSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
2. Superior INL
The AD7660 has a maximum integral nonlinearity of 3 LSBs
with no missing 16-bit code.
3. Single-Supply Operation
The AD7660 operates from a single 5 V supply and only
dissipates 21 mW typical. Its power dissipation decreases
with the throughput to, for instance, only 21 mW at a 100 SPS
throughput. It consumes 7 mW maximum when in power-down.
4. Serial or Parallel Interface
Versatile parallel or 2-wire serial interface arrangement com-
patible with both 3 V or 5 V logic.
Table I. PulSAR Selection
Type/kSPS 100–250 500–570 800–1000
Pseudo AD7651 AD7650/AD7652 AD7653
Differential AD7660/AD7661 AD7664/AD7666 AD7667
True Bipolar AD7663 AD7665 AD7671
True AD7675 AD7676 AD7677
Differential
18-Bit AD7678 AD7679 AD7674
Simultaneous/ AD7654
Multichannel AD7655
