16-Channel DAS with 14-Bit, Bipolar Input,
Dual Simultaneous Sampling ADC
Data Sheet
AD7617
FEATURES
APPꢀICATIONS
Power line monitoring
Protective relays
Multiphase motor control
Instrumentation and control systems
Data acquisition systems (DASs)
16-channel, dual, simultaneously sampled inputs
Independently selectable channel input ranges
True bipolar: ±10 V, ±± V, ±2.± V
Single ± V analog supply and 2.3 V to 3.6 V VDRIVE supply
Fully integrated data acquisition solution
Analog input clamp protection
Input buffer with 1 MΩ analog input impedance
First-order antialiasing analog filter
On-chip accurate reference and reference buffer
Dual 14-bit SAR ADC
Throughput rate: 2× 1 MSPS per channel pair
Oversampling capability with digital filter
Flexible sequencer with burst mode
Flexible parallel/serial interface
GENERAꢀ DESCRIPTION
The AD7617 is a 14-bit, DAS that supports dual simultaneous
sampling of 16 channels. The AD7617 operates from a single +5 V
supply and can accommodate ±1ꢀ V, ±5 V, and ±±.5 V true bipolar
input signals while sampling at throughput rates up to 1 MSPS
per channel pair with 85 dB signal-to-noise ratio (SNR). Higher
SNR performance can be achieved with the on-chip oversampling
mode (85.3 dB for an oversampling ratio (OSR) of ±).
The input clamp protection circuitry can tolerate voltages up to
±±1 V. The AD7617 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.
SPI/QSPI/MICROWIRE/DSP compatible
Optional CRC error checking
Hardware/software configuration
Performance
8±.3 dB typical SNR at ±00 kSPS (2× oversampling)
8± dB typical SNR at 1 MSPS
−103 dB typical THD at ±10 V range
±0.3 ꢀSB INꢀ (typical), ±0.99 ꢀSB DNꢀ (maximum)
8 kV ESD analog input pins only
The device contains analog input clamp protection, a dual, 14-bit
charge redistribution successive approximation register (SAR)
analog-to-digital converter (ADC), a flexible digital filter, a
±.5 V reference and reference buffer, and high speed serial and
parallel interfaces. The AD7617 is serial peripheral interface
(SPI)/QSPI™/DSP/MICROWIRE compatible.
On-chip self detect function
80-lead ꢀQFP package
FUNCTIONAꢀ BꢀOCK DIAGRAM
V
V
CC
REFCAP REFINOUT REFSEL
REGCAP REGCAPD
DRIVE
1MΩ
R
R
FB
1.8V
ALDO
1.8V
2.5V
REF
V0A
CLAMP
CLAMP
DLDO
FIRST-
V0AGND
ORDER LPF
FB
1MΩ
1MΩ
9:1
MUX
R
R
SERIAL
SDOx/SDI
FB
V7A
CLAMP
CLAMP
14-BIT
FIRST-
ORDER LPF
V7AGND
SER/PAR
SER1W
SAR
OSR
DIGITAL
FILTER
FB
FB
1MΩ
1MΩ
R
R
14-BIT
SAR
V0B
CLAMP
CLAMP
PARALLEL
DB15 TO DB0
OS2 TO OS0
FIRST-
ORDER LPF
V0BGND
FB
1MΩ
1MΩ
9:1
MUX
R
R
FB
RESET
V7B
CLAMP
CLAMP
FIRST-
ORDER LPF
BURST
FLEXIBLE
SEQUENCER
V7BGND
FB
1MΩ
SEQEN
CONTROL
INPUTS
HW_RNGSEL0, HW_RNGSEL1
CHSEL2 TO CHSEL0
V
CC
AD7617
CLK OSC
2:1
MUX
BUSY
ALDO
CONVST
AGND
DGND
NOTES
1. MULTIFUNCTION PINS, SUCH AS DB15/OS2, ARE REFERRED TO BY A SINGLE FUNCTION OF THE PIN,
FOR EXAMPLE, DB15, WHEN ONLY THAT FUNCTION IS RELEVANT. REFER TO THE PIN CONFIGURATION
AND FUNCTION DESCRIPTIONS SECTION FOR MORE INFORMATION.
Figure 1. AD7617 Functional Block Diagram
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Technical Support
©2017 Analog Devices, Inc. All rights reserved.
www.analog.com
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