AD7616 Datasheet, PDF (1/51 Pages) Analog Devices – 16-Channel DAS with 16-Bit, Bipolar Input, Dual Simultaneous Sampling ADC

Data Sheet
16-Channel DAS with 16-Bit, Bipolar Input,
Dual Simultaneous Sampling ADC
AD7616
FEATURES
APPLICATIONS
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 V_DRIVE 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
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
−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
80-lead LQFP package
Power line monitoring
Protective relays
Multiphase motor control
Instrumentation and control systems
Data acquisition systems (DASs)
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.
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.
The AD7616 is serial peripheral interface (SPI)/QSPI™/DSP/
MICROWIRE compatible
FUNCTIONAL BLOCK DIAGRAM
V_CC
REFCAP REFINOUT REFSEL REGCAP REGCAPD VDRIVE
V0A
V0AGND
1MΩ
CLAMP
CLAMP
1MΩ
R_FB
R_FB
FIRST-
ORDER LPF
V7A
V7AGND
V0B
V0BGND
1MΩ
CLAMP
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
V7B
V7BGND
1MΩ
CLAMP
CLAMP
1MΩ
R_FB
R_FB
R_FB
R_FB
FIRST-
ORDER LPF
FIRST-
ORDER LPF
R_FB
R_FB
FIRST-
ORDER LPF
9:1
MUX
9:1
MUX
AD7616
V_CC
ALDO
2:1
MUX
2.5V
REF
1.8V
ALDO
1.8V
DLDO
16-BIT
SAR
16-BIT
SAR
SERIAL
OSR
DIGITAL
FILTER
PARALLEL/
SERIAL
INTERFACE
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.
Rev. 0
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