AD7616 DATA
ACQUISITION SYSTEM
A new solution for smart grid distribution equipment that achieves high
accuracy while simplifying development and reducing system cost.
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Applications
X
Power line monitoring
X
Relay protection for low voltage
DTUs and FTUs
X
Multiphase motor control
X
Instrumentation and control
systems
X
Data acquisition systems
Accuracy
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
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 sup-
plies. 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.
SDO/SDI
Parallel
V
CC
V
CC
V
CC
REFCAP REFINOUT REFSEL REGCAP REGCAPD V
DRIVE
V0A
V0AGND
V7A
V7AGND
V0B
V0BGND
V7B
V7BGND
AGND AGND DGND
SER/PAR
SER1W
DB [15:0]
OS [2:0]
Reset
Burst
SEQEN
HW_RNGS
EL [1:0]
CHSEL [2:0]
Busy
CONVST
Clamp
Clamp
Clamp
Clamp
Clamp
Clamp
Clamp
Clamp
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
1 MΩ
R
FB
R
FB
R
FB
R
FB
R
FB
R
FB
R
FB
R
FB
AD7616
ALDO
First-
Order LPF
First-
Order LPF
First-
Order LPF
First-
Order LPF
9:1
Mux
9:1
Mux
2:1
Mux
16-Bit
SAR
Flexible
Sequencer
CLK OSC
2.5 V
REF
OSR
Digital
Filter
1.8 V
ALDO
1.8 V
DLDO
Serial
Control
Inputs
+
–
+
–
+
–
+
–
16-Bit
SAR
Parallel/
Serial
Interface
Features
X
16-channel, dual, simultaneously
sampled inputs
X
Independently selectable channel
input ranges
X
True bipolar: ±10 V, ±5 V, ±2.5 V
X
Single 5 V analog supply and 2.3 V to
5.25 V V
DRIVE
X
Fully integrated data acquisition solution
X
Analog input clamp protection
X
Input buffer with 1 MΩ analog input
impedance
X
First-order antialiasing analog filter
X
On-chip accurate reference and
reference buffer
X
Dual, 16-bit, SAR ADC
X
Throughput rate: 2 × 1 MSPS
X
Oversampling capability with digital filter
X
Flexible sequencer with burst mode
X
Flexible parallel/serial interface
X
SPI/QSPI
™
/Microwire
™
/DSP compatible
X
Optional CRC error checking
X
Hardware/software configuration
X
On-chip self-detect function
X
80-lead LQFP package