Datasheet AD7616 (Analog Devices)

16-Channel DAS with 16-Bit, Bipolar Input, Dual Simultaneous Sampling ADC Data Sheet AD7616 FEATURES APPLICATIONS 16-channel, dual, simultaneously sampled inputs Power line monitoring Independently selectable channel input ranges Protective relays True bipolar: ±10 V, ±5 V, ±2.5 V Multiphase motor control Single 5 V analog supply and 2.3 V to 3.6 V V supply Instrumentation and control systems DRIVE Fully integrated data acquisition solution Data acquisition systems (DASs) Analog input clamp protection GENERAL DESCRIPTION Input buffer with 1 MΩ analog input impedance First-order antialiasing analog filter
The AD7616 is a 16-bit, DAS that supports dual simultaneous
On-chip accurate reference and reference buffer
sampling of 16 channels. The AD7616 operates from a single 5 V
Dual 16-bit successive approximation register (SAR) ADC
supply and can accommodate ±10 V, ±5 V, and ±2.5 V true bipolar
Throughput rate: 2 × 1 MSPS
input signals while sampling at throughput rates up to 1 MSPS
Oversampling capability with digital filter
per channel pair with 90.5 dB SNR. Higher SNR performance can
Flexible sequencer with burst mode
be achieved with the on-chip oversampling mode (92 dB for an
Flexible parallel/serial interface
oversampling ratio (OSR) of 2).
SPI/QSPI/MICROWIRE/DSP compatible
The input clamp protection circuitry can tolerate voltages up to
Optional cyclic redundancy check (CRC) error checking
±21 V. The AD7616 has 1 MΩ analog input impedance, regardless
Hardware/software configuration
of sampling frequency. The single-supply operation, on-chip
Performance
filtering, and high input impedance eliminate the need for
92 dB SNR at 500 kSPS (2× oversampling)
driver op amps and external bipolar supplies.
90.5 dB SNR at 1 MSPS
The device contains analog input clamp protection, a dual, 16-bit
−103 dB THD
charge redistribution SAR analog-to-digital converter (ADC), a
±1 LSB INL (typical), ±0.99 LSB DNL (maximum)
flexible digital filter, a 2.5 V reference and reference buffer, and
8 kV ESD rating on analog input channels
high speed serial and paral el interfaces.
On-chip self detect function 80-lead LQFP package
The AD7616 is serial peripheral interface (SPI)/QSPI™/DSP/ MICROWIRE compatible
FUNCTIONAL BLOCK DIAGRAM VCC REFCAP REFINOUT REFSEL REGCAP REGCAPD VDRIVE 1MΩ R V0A FB 2.5V 1.8V 1.8V CLAMP REF ALDO DLDO V0AGND FIRST- CLAMP 1MΩ RFB ORDER LPF 9:1 MUX 1MΩ SERIAL SDOx/SDI R V7A FB CLAMP 16-BIT V7AGND FIRST- CLAMP PARALLEL/ SER/PAR ORDER LPF SAR OSR 1MΩ RFB SERIAL DIGITAL SER1W 1MΩ INTERFACE R FILTER FB V0B 16-BIT CLAMP SAR PARALLEL DB15 TO DB0 FIRST- V0BGND CLAMP 1MΩ RFB ORDER LPF OS2 TO OS0 9:1 1MΩ R MUX FB V7B RESET CLAMP FIRST- V7BGND FLEXIBLE BURST CLAMP 1MΩ RFB ORDER LPF SEQUENCER SEQEN CONTROL HW_RNGSEL0, HW_RNGSEL1 INPUTS CHSEL2 TO CHSEL0 AD7616 VCC 2:1 CLK OSC BUSY ALDO MUX CONVST AGND DGND NOTES 1. MULTIFUNCTION PINS, SUCH AS DB15/OS2, ARE REFERRED TO BY A SINGLE FUNCTION OF THE PIN,
001
FOR EXAMPLE, DB15, WHEN ONLY THAT FUNCTION IS RELEVANT. REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION FOR MORE INFORMATION.
13591- Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS Universal Timing Specifications Parallel Mode Timing Specifications Serial Mode Timing Specifications ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CONVERTER DETAILS ANALOG INPUT Analog Input Channel Selection Analog Input Ranges Analog Input Impedance Analog Input Clamp Protection Analog Input Antialiasing Filter ADC TRANSFER FUNCTION INTERNAL/EXTERNAL REFERENCE SHUTDOWN MODE DIGITAL FILTER APPLICATIONS INFORMATION FUNCTIONALITY OVERVIEW POWER SUPPLIES TYPICAL CONNECTIONS DEVICE CONFIGURATION OPERATIONAL MODE INTERNAL/EXTERNAL REFERENCE DIGITAL INTERFACE HARDWARE MODE SOFTWARE MODE RESET FUNCTIONALITY PIN FUNCTION OVERVIEW DIGITAL INTERFACE CHANNEL SELECTION Hardware Mode Software Mode PARALLEL INTERFACE Reading Conversion Results Writing Register Data Reading Register Data SERIAL INTERFACE Reading Conversion Results Writing Register Data Reading Register Data SEQUENCER HARDWARE MODE SEQUENCER SOFTWARE MODE SEQUENCER BURST SEQUENCER Hardware Mode Burst Software Mode Burst DIAGNOSTICS DIAGNOSTIC CHANNELS INTERFACE SELF TEST CRC REGISTER SUMMARY ADDRESSING REGISTERS CONFIGURATION REGISTER CHANNEL REGISTER INPUT RANGE REGISTERS INPUT RANGE REGISTER A1 INPUT RANGE REGISTER A2 INPUT RANGE REGISTER B1 INPUT RANGE REGISTER B2 SEQUENCER STACK REGISTERS STATUS REGISTER OUTLINE DIMENSIONS ORDERING GUIDE