AD7617 Datasheet, PDF (1/52 Pages) Analog Devices – 16-Channel DAS with 14-Bit, Bipolar Input, Dual Simultaneous Sampling ADC

Data Sheet
16-Channel DAS with 14-Bit, Bipolar Input,
Dual Simultaneous Sampling ADC
AD7617
FEATURES
16-channel, dual, simultaneously sampled inputs
Independently selectable channel input ranges
True bipolar: ±10 V, ±5 V, ±2.5 V
Single 5 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
SPI/QSPI/MICROWIRE/DSP compatible
Optional CRC error checking
Hardware/software configuration
Performance
85.3 dB typical SNR at 500 kSPS (2× oversampling)
85 dB typical SNR at 1 MSPS
−103 dB typical THD at ±10 V range
±0.3 LSB INL (typical), ±0.99 LSB DNL (maximum)
8 kV ESD analog input pins only
On-chip self detect function
80-lead LQFP package
APPLICATIONS
Power line monitoring
Protective relays
Multiphase motor control
Instrumentation and control systems
Data acquisition systems (DASs)
GENERAL 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 ±10 V, ±5 V, and ±2.5 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 2).
The input clamp protection circuitry can tolerate voltages up to
±21 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.
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
2.5 V reference and reference buffer, and high speed serial and
parallel interfaces. The AD7617 is serial peripheral interface
(SPI)/QSPI™/DSP/MICROWIRE compatible.
V0A
V0AGND
V7A
V7AGND
V0B
V0BGND
V7B
V7BGND
FUNCTIONAL BLOCK DIAGRAM
V_CC
REFCAP REFINOUT REFSEL REGCAP REGCAPD VDRIVE
1MΩ
CLAMP
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
R_FB
R_FB
FIRST-
ORDER LPF
R_FB
R_FB
FIRST-
ORDER LPF
R_FB
R_FB
FIRST-
ORDER LPF
R_FB
R_FB
FIRST-
ORDER LPF
9:1
MUX
9:1
MUX
AD7617
V_CC
ALDO
2:1
MUX
2.5V
REF
1.8V
ALDO
1.8V
DLDO
14-BIT
SAR
14-BIT
SAR
OSR
DIGITAL
FILTER
SERIAL
PARALLEL
SDOx/SDI
SER/PAR
SER1W
DB15 TO DB0
OS2 TO OS0
FLEXIBLE
SEQUENCER
CLK OSC
CONTROL
INPUTS
RESET
BURST
SEQEN
HW_RNGSEL0, HW_RNGSEL1
CHSEL2 TO CHSEL0
BUSY
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
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