16-Channel DAS with 16-Bit, Bipolar Input,
Dual Simultaneous Sampling ADC
Data Sheet
AD7616
Rev. 0 Document Feedback
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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 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
APPLICATIONS
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. T h e 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
Figure 1.
13591-001
R
FB
1MΩ
1MΩ
R
FB
FIRST-
ORDER L PF
R
FB
1MΩ
1MΩ
R
FB
FIRST-
ORDER L PF
V0A
V0AGND
R
FB
1MΩ
1MΩ
R
FB
V7A
V7AGND
V0B
V0BGND
V7B
V7BGND
9:1
MUX
BUSY
CONVST
CONTROL
INPUTS
CLK O S C
REFINOUT
REFSEL
SER/PAR
SER1W
OSR
DIGITAL
FILTER
2.5V
REF
REFCAP
NOTES
1. M ULTIF UNCTION PINS, S UCH AS DB15/O S 2, ARE REFERRE D TO BY A S ING LE F UNCTI ON OF T HE P IN,
FOR EXAMPLE, DB15, WHEN ONLY THAT FUNCTION IS RELEVANT. REFER TO THE PIN CONFIGURATION
AND FUNCTION DESCRIPTIONS SECTION FOR MORE INFORMATION.
SERIAL
REGCAP
REGCAPD
1.8V
DLDO
V
CC
AD7616
9:1
MUX
16-BIT
SAR
16-BIT
SAR
OS2 TO OS0
V
DRIVE
V
CC
ALDO
2:1
MUX
HW_RNGSEL0, HW_RNGS E L1
CHSEL 2 TO CHS E L0
SEQEN
FLEXIBLE
SEQUENCER
BURST
RESET
AGND
DGND
DB15 TO DB0
SDOx/SDI
PARALLEL
FIRST-
ORDER L PF
R
FB
1MΩ
1MΩ
R
FB
FIRST-
ORDER L PF
1.8V
ALDO
PARALLEL/
SERIAL
INTERFACE
CLAMP
CLAMP
CLAMP
CLAMP
CLAMP
CLAMP
CLAMP
CLAMP
AD7616 Data Sheet
Rev. 0 | Page 2 of 50
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications .................................................................. 6
Parallel Mode Timing Specifications ......................................... 8
Serial Mode Timing Specifications ............................................ 9
Absolute Maximum Ratings .......................................................... 10
Thermal Resistance .................................................................... 10
ESD Caution ................................................................................ 10
Pin Configuration and Function Descriptions ........................... 11
Typical Performance Characteristics ........................................... 15
Terminology .................................................................................... 21
Theory of Operation ...................................................................... 23
Converter Details........................................................................ 23
Analog Input ............................................................................... 23
ADC Transfer Function ............................................................. 24
Internal/External Reference ...................................................... 24
Shutdown Mode .......................................................................... 25
Digital Filter ................................................................................ 25
Applications Information .............................................................. 26
Functionality Overview ............................................................. 26
Device Configuration ..................................................................... 28
Operational Mode ...................................................................... 28
Internal/External Reference ...................................................... 28
Digital Interface .......................................................................... 28
Hardware Mode .......................................................................... 28
Software Mode ............................................................................ 29
Reset Functionality..................................................................... 29
Pin Function Overview ............................................................. 30
Digital Interface .............................................................................. 31
Channel Selection ....................................................................... 31
Parallel Interface ......................................................................... 32
Serial Interface ............................................................................ 33
Sequencer......................................................................................... 35
Hardware Mode Sequencer ....................................................... 35
Software Mode Sequencer ......................................................... 35
Burst Sequencer .......................................................................... 36
Diagnostics ...................................................................................... 38
Diagnostic Channels .................................................................. 38
Interface Self Test ....................................................................... 38
CRC .............................................................................................. 38
Register Summary .......................................................................... 40
Addressing Registers .................................................................. 41
Configuration Register .............................................................. 42
Channel Register ........................................................................ 43
Input Range Registers ................................................................ 44
Input Range Register A1............................................................ 44
Input Range Register A2............................................................ 45
Input Range Register B1 ............................................................ 46
Input Range Register B2 ............................................................ 47
Sequencer Stack Registers ......................................................... 48
Status Register ............................................................................. 49
Outline Dimensions ....................................................................... 50
Ordering Guide .......................................................................... 50
REVISION HISTORY
10/2016—Revision 0: Initial Version