AD7616 Data Acquisition System PDF

AD7616 DATA
ACQUISITION SYSTEM
A new solution for smart grid distribution equipment that achieves high
accuracy while simplifying development and reducing system cost.
Accuracy
Applications
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Power line monitoring
Relay protection for low voltage
DTUs and FTUs
Multiphase motor control
Instrumentation and control
systems
Data acquisition systems
The AD7616 can easily achieve Class 0.2 measurement accuracy because its on-chip ADCs have 90 dB
of SNR. Higher SNR performance of 92 dB can be achieved by using the on-chip oversampling mode.
Simplicity
The AD7616 is a 16-bit, data acquisition system that supports dual simultaneous sampling of
16 channels. This input scheme simplifies system design by removing phase shift associated with
voltage and current channels. In addition, it operates from a single 5 V supply, which simplifies
the power supply design work.
Reduced System Cost
The AD7616 is a 16-channel data acquisition system (DAS) that is highly integrated and can
accept a variety of input signal ranges (±10 V, ±5 V, ±2.5 V). The analog front end features a 1 MΩ,
high impedance, very low drift, input buffer. This eliminates the need for external protection circuits
or external signal conditioning ICs, greatly minimizing the system cost and bill of material.
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General Description
Features
The AD7616 is a 16-bit DAS designed for a variety
of transmission and distribution applications,
including power line monitoring, relay protection
for low voltage, distribution terminal units (DTUs),
and feeder terminal units (FTUs). It supports
dual simultaneous sampling of 16 channels and
operates from a single 5 V supply. The AD7616
can accommodate ±10 V, ±5 V, and ±2.5 V
true bipolar input signals while sampling at
throughput rates up to 2 × 1 MSPS per channel
pair with 90 dB SNR. It 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. Each part contains analog input clamp
protection, a dual, 16-bit, charge redistribution
successive approximation analog-to-digital
converter (ADC), a flexible digital filter, a 2.5 V
reference and reference buffer, and high speed
serial and parallel interfaces.
VCC
V0A
Clamp
V0AGND
Clamp
V7A
Clamp
V7AGND
Clamp
V0B
Clamp
V0BGND
Clamp
V7B
Clamp
V7BGND
Clamp
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
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XX
VCC
+
–
REFCAP
REFINOUT
RFB
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Dual, 16-bit, SAR ADC
Throughput rate: 2 × 1 MSPS
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
On-chip self-detect function
80-lead LQFP package
REFSEL REGCAP REGCAPD VDRIVE
RFB
2.5 V
REF
FirstOrder LPF
1.8 V
ALDO
9:1
Mux
+
–
+
–
+
–
RFB
FirstOrder LPF
RFB
OSR
Digital
Filter
Parallel/
Serial
Interface
SDO/SDI
SER/PAR
SER1W
Parallel
DB [15:0]
OS [2:0]
9:1
Mux
RFB
RFB
16-Bit
SAR
FirstOrder LPF
FirstOrder LPF
Reset
Burst
Flexible
Sequencer
SEQEN
Control
Inputs
2:1
Mux
ALDO
AGND
16-Bit
SAR
RFB
1.8 V
DLDO
Serial
RFB
VCC
AD7616
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
5.25 V VDRIVE
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
HW_RNGSEL [1:0]
CHSEL [2:0]
CLK OSC
Busy
CONVST
AGND
DGND
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