4-Channel DAS with 16-Bit, Bipolar Input,
Simultaneous Sampling ADC
AD7605-4
Data Sheet
FEATURES
GENERAL DESCRIPTION
4 simultaneously sampled inputs
The AD7605-41 is a 4-channel, 16-bit, simultaneous sampling,
True bipolar analog input ranges: ±10 V (maximum),
±± V (maximum)
Single ± V analog supply and 2.± V to ± V VDRIVE (nominal)
Fully integrated data acquisition solution
Analog input clamp protection
Input buffer with 1 MΩ analog input impedance
Second-order antialiasing analog filter
On-chip accurate reference and reference buffer
16-bit ADC with 300 kSPS on all channels
Flexible parallel/serial interface
Serial peripheral interface (SPI)/QSPI/MICROWIRE/DSP
compatible
Performance
7 kV ESD rating on analog input pins
Standby mode: 2± mW (typical)
analog-to-digital data acquisition system (DAS). The device
contains analog input clamp protection, a second-order antialias-
ing filter, a track-and-hold amplifier, a 16-bit charge redistribution
successive approximation analog-to-digital converter (ADC), a
2.5 V reference and reference buffer, and high speed serial and
parallel interfaces.
The AD7605-4 operates from a single 5 V supply and can
accommodate 10 V and 5 V true bipolar input signals while
sampling at throughput rates of up to 300 kSPS for all channels.
The input clamp protection circuitry can tolerate voltages up to
16.5 V. The AD7605-4 has 1 MΩ analog input impedance,
regardless of sampling frequency. The single-supply operation,
on-chip filtering, and high input impedance eliminate the need
for driver op amps and external bipolar supplies.
The AD7605-4 is SPI, QSPI™, MICROWIRE™, and digital signal
processor (DSP) compatible.
64-lead LQFP package
APPLICATIONS
Table 1. High Resolution, Bipolar Input, Simultaneous
Sampling DAS Solutions
Power line monitoring and protection systems
Multiphase motor control
Instrumentation and control systems
Multiaxis positioning systems
Resolution Single-Ended True Differential No. of Simultaneous
(Bits)
Inputs
Inputs
Sampling Channels
18
AD7608
AD7606
AD7606-6
AD7606-4
AD7605-4
AD7607
AD7609
8
8
6
4
4
8
Data acquisition systems (DAS)
16
14
FUNCTIONAL BLOCK DIAGRAM
REGCAP REGCAP REFCAPB REFCAPA
AV
AV
CC
CC
R
1MΩ
FB
2.5V
LDO
2.5V
LDO
V1
CLAMP
CLAMP
T/H
SECOND-
V1GND
ORDER LPF
R
R
FB
1MΩ
1MΩ
FB
REFIN/REFOUT
V2
CLAMP
CLAMP
T/H
T/H
T/H
SECOND-
ORDER LPF
V2GND
R
R
FB
1MΩ
1MΩ
REF SELECT
AGND
2.5V
REF
4:1
MUX
FB
V3
CLAMP
CLAMP
DB7/D
A
B
OUT
SECOND-
ORDER LPF
SERIAL
V3GND
R
R
DB8/D
FB
1MΩ
1MΩ
OUT
PARALLEL/
SERIAL
INTERFACE
RD/SCLK
CS
16-BIT
SAR
FB
V4
CLAMP
CLAMP
SECOND-
ORDER LPF
V4GND
R
FB
1MΩ
PAR/SER/BYTE SEL
V
DRIVE
PARALLEL
DB0 TO DB15/BYTESEL
CLK OSC
AD7605-4
BUSY
CONTROL
INPUTS
FRSTDATA
AGND
CONVST A CONVST B RESET RANGE
Figure 1.
1 Protected by U.S. Patent No. 8,072,360 B2.
Rev. 0
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