8-Channel DAS with 18-Bit, 1 MSPS Bipolar
Input, Simultaneous Sampling ADC
AD7606C-18
Data Sheet
FEATURES
CALIBRATION AND DIAGNOSTICS
18-bit ADC with 1 MSPS on all channels
Per channel system phase, offset, and gain calibration
Input buffer with 1 MΩ minimum analog input impedance (RIN)
Single 5 V analog supply and 1.71 V to 5.25 V VDRIVE
Per channel selectable analog input ranges
Bipolar single-ended: 12.5 V, 10 V, 6.25 V, 5 V, 2.5 V
Unipolar single-ended: 0 V to 12.5 V, 0 V to 10 V, 0 V to 5 V
Bipolar differential: 20 V, 12.5 V, 10 V, 5 V
Two bandwidth options: 25 kHz and 220 kHz, per channel
Flexible digital filter, oversampling ratio up to 256
−40°C to +125°C operating range
21 V input clamp protection with 6 kV ESD
Pin to pin compatible to the AD7606B, AD7608, and AD7609
Performance
93 dB SNR
102 dB SNR, oversampling by 32
Analog input open circuit detection feature
Self diagnostics and monitoring features
CRC error checking on read and write data and registers
APPLICATIONS
Power line monitoring
Protective relays
Multiphase motor control
Instrumentation and control systems
Data acquisition systems
COMPANION PRODUCTS
Voltage References: ADR4525, LT6657, LTC6655
Digital Isolators: ADuM142E, ADuM6422A, ADuM5020,
ADuM5028
AD7606x Family Software Model
Additional companion products on the AD7606C-18 product
page
−100 dB THD
TUE = 0.05% of FSR maximum, external reference
1 ppm/°C positive and negative FS error drift
3 ppm/°C reference temperature coefficient
FUNCTIONAL BLOCK DIAGRAM
5V
5V
1.71V TO 5.25V
1µF
100nF
100nF
100nF
1µF
V
AV
AV
CC
REGCAP
REGCAP
DRIVE
CC
ALDO
LPF
DLDO
1MΩ
1MΩ
V1+
V1–
CLAMP
CLAMP
CONVST
CLK OSC
PGA
PGA
SAR
SAR
RESET
RANGE
CONTROL
INPUTS
OS0 TO OS2
1MΩ
1MΩ
V8+
V8–
BUSY
CLAMP
CLAMP
PROGRAMMABLE
DIGITAL FILTER
FRSTDATA
LPF
OPTIONAL
RC FILTER
SERIAL
D
A TO D H
OUT OUT
ADC, PGA, AND
CHANNEL
SDI
REFCAPA
SCLK
CS
CONFIGURATION
PARALLEL/
10µF
+
SERIAL
INTERFACE
OPTIONAL EXTERNAL
REFERENCE
CC
PARALLEL
DB0 TO DB17
GAIN, OFFSET
AND PHASE
CALIBRATION
REFCAPB
AV
RD
INTERNAL
REFERENCE
REFIN/REFOUT
+2.5V
WR
V
V
OUT
IN
+
100nF
2.5V
REF
DIAGNOSTICS
AND SENSOR
DISCONNECT
PAR/SER SEL
ADR4525
GND
1µF
0.1µF
REFSELECT
REFGND
AD7606C-18
AGND
Figure 1.
Rev. 0
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