AD7605-4 Datasheet, PDF (1/28 Pages) Analog Devices – 4-Channel DAS with 16-Bit, Bipolar Input, Simultaneous Sampling ADC

Data Sheet
4-Channel DAS with 16-Bit, Bipolar Input,
Simultaneous Sampling ADC
AD7605-4
FEATURES
4 simultaneously sampled inputs
True bipolar analog input ranges: ±10 V (maximum),
±5 V (maximum)
Single 5 V analog supply and 2.5 V to 5 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: 25 mW (typical)
64-lead LQFP package
APPLICATIONS
Power line monitoring and protection systems
Multiphase motor control
Instrumentation and control systems
Multiaxis positioning systems
Data acquisition systems (DAS)
GENERAL DESCRIPTION
The AD7605-4¹ is a 4-channel, 16-bit, simultaneous sampling,
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.
Table 1. High Resolution, Bipolar Input, Simultaneous
Sampling DAS Solutions
Resolution Single-Ended True Differential No. of Simultaneous
(Bits)
Inputs
Inputs
Sampling Channels
18
AD7608
AD7609
8
16
AD7606
8
AD7606-6
6
AD7606-4
4
AD7605-4
4
14
AD7607
8
FUNCTIONAL BLOCK DIAGRAM
AV_CC AV_CC
REGCAP REGCAP REFCAPB REFCAPA
V1
V1GND
V2
V2GND
V3
V3GND
V4
V4GND
CLAMP ^1MΩ
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
CLAMP ^1MΩ
CLAMP
1MΩ
R_FB
SECOND- ^T/H
R_FB ^{ORDER LPF}
R_FB
SECOND- ^T/H
R_FB ^{ORDER LPF}
R_FB
SECOND- ^T/H
R_FB ^{ORDER LPF}
R_FB
SECOND- ^T/H
R_FB ^{ORDER LPF}
AD7605-4
2.5V
LDO
2.5V
LDO
4:1
MUX
16-BIT
SAR
2.5V
REF
SERIAL
PARALLEL/
SERIAL
INTERFACE
CLK OSC
CONTROL
INPUTS
PARALLEL
REFIN/REFOUT
REF SELECT
AGND
DB7/D_OUTA
DB8/D_OUTB
RD/SCLK
CS
PAR/SER/BYTE SEL
V_DRIVE
DB0 TO DB15/BYTESEL
BUSY
FRSTDATA
AGND
CONVST A CONVST B RESET RANGE
1 _{Protected by U.S. Patent No. 8,072,360 B2.}
Figure 1.
Rev. 0
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