16-Channel DAS with 16-Bit, Bipolar Input,
Dual Simultaneous Sampling ADC
Data Sheet
AD7616
FEATURES
APPLICATIONS
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, 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 16-bit successive approximation register (SAR) ADC
Throughput rate: 2 × 1 MSPS
Oversampling capability with digital filter
Flexible sequencer with burst mode
Flexible parallel/serial interface
GENERAL DESCRIPTION
The AD7616 is a 16-bit, DAS that supports dual simultaneous
sampling of 16 channels. The AD7616 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 90.5 dB SNR. Higher SNR performance can
be achieved with the on-chip oversampling mode (92 dB for an
oversampling ratio (OSR) of 2).
The input clamp protection circuitry can tolerate voltages up to
21 V. The AD7616 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 cyclic redundancy check (CRC) error checking
Hardware/software configuration
Performance
92 dB SNR at 500 kSPS (2× oversampling)
90.5 dB SNR at 1 MSPS
The device contains analog input clamp protection, a dual, 16-bit
charge redistribution 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.
−103 dB THD
1 LSB INL (typical), 0.99 LSB DNL (maximum)
8 kV ESD rating on analog input channels
On-chip self detect function
The AD7616 is serial peripheral interface (SPI)/QSPI™/DSP/
MICROWIRE compatible
80-lead LQFP package
FUNCTIONAL BLOCK DIAGRAM
V
V
CC
REFCAP REFINOUT REFSEL
REGCAPD
REGCAP
DRIVE
1MΩ
R
R
FB
1.8V
1.8V
V0A
2.5V
REF
CLAMP
CLAMP
ALDO
DLDO
FIRST-
V0AGND
ORDER LPF
FB
1MΩ
1MΩ
9:1
MUX
SERIAL
SDOx/SDI
R
R
FB
V7A
CLAMP
CLAMP
16-BIT
FIRST-
ORDER LPF
V7AGND
SER/PAR
SER1W
PARALLEL/
SAR
OSR
DIGITAL
FILTER
FB
FB
SERIAL
1MΩ
1MΩ
INTERFACE
R
R
16-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
BUSY
V
CC
AD7616
CLK OSC
2:1
MUX
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.
Rev. 0
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