8-/6-/4-Channel DAS with 16-Bit, Bipolar
Input, Simultaneous Sampling ADC
AD7606/AD7606-6/AD7606-4
APPꢀICATIONS
FEATURES
8/6/4 simultaneously sampled inputs
True bipolar analog input ranges: ±10 V, ±± V
Single ± V analog supply and 2.3 V to ± V VDRIVE
Fully integrated data acquisition solution
Analog input clamp protection
Power-line monitoring and protection systems
Multiphase motor control
Instrumentation and control systems
Multiaxis positioning systems
Data acquisition systems (DAS)
Input buffer with 1 MΩ analog input impedance
Second-order antialiasing analog filter
On-chip accurate reference and reference buffer
16-bit ADC with 200 kSPS on all channels
Oversampling capability with digital filter
Flexible parallel/serial interface
SPI/QSPI™/MICROWIRE™/DSP compatible
Performance
7 kV ESD rating on analog input channels
9±.± dB SNR, −107 dB THD
Table 1. High Resolution, Bipolar Input, Simultaneous
Sampling DAS Solutions
Single-
Ended
Inputs
True
Number of
Differential Simultaneous
Inputs
Resolution
18 Bits
Sampling Channels
AD7608
AD7606
AD7606-6
AD7606-4
AD7607
AD7609
8
8
6
4
8
16 Bits
14 Bits
±0.± ꢀSB INꢀ, ±0.± ꢀSB DNꢀ
ꢀow power: 100 mW
Standby mode: 2± mW
64-lead ꢀQFP package
FUNCTIONAꢀ BꢀOCK DIAGRAM
AVCC
AVCC
REGCAP REGCAP
REFCAPB REFCAPA
RFB
1MΩ
V1
CLAMP
CLAMP
T/H
SECOND-
ORDER LPF
V1GND
2.5V
LDO
2.5V
LDO
RFB
RFB
1MΩ
1MΩ
REFIN/REFOUT
V2
CLAMP
CLAMP
T/H
T/H
T/H
T/H
T/H
T/H
T/H
SECOND-
V2GND
ORDER LPF
RFB
RFB
1MΩ
1MΩ
REF SELECT
AGND
2.5V
REF
V3
CLAMP
CLAMP
OS 2
OS 1
OS 0
SECOND-
ORDER LPF
V3GND
RFB
RFB
1MΩ
1MΩ
V4
CLAMP
CLAMP
DOUT
DOUT
A
B
SECOND-
ORDER LPF
V4GND
SERIAL
RFB
RFB
1MΩ
1MΩ
8:1
MUX
PARALLEL/
SERIAL
RD/SCLK
CS
DIGITAL
16-BIT
SAR
V5
CLAMP
CLAMP
FILTER
INTERFACE
SECOND-
ORDER LPF
V5GND
RFB
RFB
1MΩ
1MΩ
PAR/SER/BYTE SEL
VDRIVE
V6
CLAMP
CLAMP
SECOND-
ORDER LPF
PARALLEL
DB[15:0]
V6GND
RFB
RFB
1MΩ
1MΩ
AD7606
V7
CLAMP
CLAMP
SECOND-
ORDER LPF
V7GND
CLK OSC
RFB
RFB
1MΩ
1MΩ
BUSY
CONTROL
INPUTS
V8
CLAMP
CLAMP
SECOND-
ORDER LPF
FRSTDATA
V8GND
RFB
1MΩ
AGND
CONVST A CONVST B RESET RANGE
Figure 1.
Rev. 0
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