Analog Devices: CN0229 Reference Design for 4-Channel, Flexible, Configurable, Voltage, and Current Output Circuit for I/O Card and PLC Applications

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Kit Overview

The circuit EVAL-CN0229-SDPZEVAL-CN0229-SDPZ is a multichannel, flexible, analog output solution with only two analog components and meets most requirements for multichannel I/O cards, programmable logic controllers (PLCs), and distributed control systems (DCSs) applications. The AD5686RAD5686R quad, 16-bit nanoDAC+ with rail-to-rail buffered outputs combined with four of the AD5750-2AD5750-2 industrial current/voltage output drivers provide all the typical output current and voltage ranges with 16-bit resolution, no missing codes, 0.05% linearity, and less than 0.1% output error.

An ultralow drift (2 ppm/°C typical), 2.5 V voltage reference with high drive capability (up to ±5 mA) is integrated in the AD5686RAD5686R and provides the reference voltage for both the AD5686R and the AD5750-2. This guarantees low noise, high accuracy, and low temperature drift for the circuit.

The ADuM1301ADuM1301 and ADuM5400ADuM5400 provide 2500 V rms isolation both on power, and all the necessary signals between the analog signal chain and the host controller.

For multichannel I/O card applications that need more than 4 channels, several AD5686RAD5686Rs can be connected in a daisy chain, and no additional external digital I/O circuits are required. This minimizes the cost, especially for high channel count isolated applications.

The circuit also contains key features for industrial applications, such as on-chip output fault detection, packet error checking (PEC) by the CRC, flexible power-up options, and ESD protection (4 kV for the AD5686RAD5686R, human body model and 3 kV for the AD5750-2AD5750-2, human body model), making it an ideal choice for robust industrial control systems. No external precision resistors or calibration routines are needed to maintain consistent performance in mass production, thereby making it ideal for PLC or DCS modules.

This circuit uses the EVAL-CN0229-SDPZEVAL-CN0229-SDPZ circuit board and the EVAL-SDP-CB1ZEVAL-SDP-CB1Z System Demonstration Platform (SDP-B) evaluation board. The EVAL-CN0229-SDPZEVAL-CN0229-SDPZ board contains the circuit to be evaluated and the SDP evaluation board is used with the CN-0229 evaluation software to capture the data from the EVAL-CN0229-SDPZEVAL-CN0229-SDPZ circuit board.

Key Applications: Programmable Logic Controllers/ Distributed Control Systems

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Development Tools

System Demonstration Platform (EVAL-SDP-CB1ZEVAL-SDP-CB1Z)
- Blackfin Processor ADSP-BF527
- USB 2.0 Interface to PC
- JTAG header footprint
- 32MB SDRAM
- 2 x Small Footprint 120 Pin Connectors
- Configurable Peripheral Interfaces - SPI - SPORT - I2C - GPIOs - Parallel - Timers
CN-0229 Circuit Evaluation Board (EVAL-CN0229-SDPZEVAL-CN0229-SDPZ)
CN-0229 Evaluation Software
Agilent 34401A 6.5 Digital Multimeter or equivalent
Agilent E3631A 0 V to ~6 V/5 A ±25 V/1 A Triple Output DC Power Supply or equivalent
PC (Windows 2000 or Windows XP) with USB interface
National Instruments GPIB to USB-B interface and cable

Technical Documents

Learning Center

Type	Description
User Manual	ADI: User Manual for CN-0229 4-Channel, Flexible, Configurable, Voltage, and Current Output Circuit for I/O Card and PLC Applications
User Guide	ADI: User Guide for EVAL-SDP-CB1Z
Datasheet	ADI: Datasheet for AD5686R/AD5685R/AD5684R: Quad, 16-/14-/12-Bit nanoDAC+ with 2 ppm/°C Reference, SPI Interface (Rev A)
Datasheet	ADI: Datasheet for AD5750/AD5750-1/AD5750-2: Industrial Current/Voltage Output Driver with Programmable Ranges (Rev E)
Datasheet	ADI: Datasheet for ADuM1300/ADuM1301: Triple-Channel Digital Isolators (Rev I)
Datasheet	ADI: Datasheet for ADuM5400: Quad-Channel Isolator with Integrated DC-to-DC Converter (Rev B)

Design Elements

Type	Description
Schematics	ADI: Schematics for EVAL-CN0229-SDPZ Evaluation Board
Layout	ADI: Layout for EVAL-CN0229-SDPZ
BOM	ADI: Bill Of Material (BOM) for EVAL-CN0229-SDPZ Evaluation Board

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Kit Features

Devices Used for the EVAL-CN0229-SDPZEVAL-CN0229-SDPZ Evaluation Board
Key features for ADuM1301ADuM1301: Qualified for automotive applications Low power operation 5 V operation 1.2 mA per channel maximum @ 0 Mbps to 2 Mbps 3.5 mA per channel maximum @ 10 Mbps 32 mA per channel maximum @ 90 Mbps 3 V operation 0.8 mA per channel maximum @ 0 Mbps to 2 Mbps 2.2 mA per channel maximum @ 10 Mbps 20 mA per channel maximum @ 90 Mbps Bidirectional communication 3 V/5 V level translation High temperature operation: 125°C High data rate: dc to 90 Mbps (NRZ) Precise timing characteristics 2 ns maximum pulse width distortion 2 ns maximum channel-to-channel matching High common-mode transient immunity: >25 kV/μs Output enable function	Key Features for AD5750-2AD5750-2: Current output ranges: 4 mA to 20 mA, 0 mA to 20 mA, 0 mA to 24 mA, ±20 mA, and ±24 mA ±0.03% full-scale range (FSR) total unadjusted error (TUE) ±5 ppm/°C typical output drift Voltage output ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V with 20% overrange ±0.02% FSR TUE ±3 ppm/°C typical output drift Flexible serial digital interface On-chip output fault detection Packet error checking (PEC) Asynchronous CLEAR function Flexible power-up condition to 0 V or tristate Power supply range AVDD: +12 V (± 10%) to +24 V (± 10%) AVSS: −12 V (± 10%) to −24 V (± 10%) Output loop compliance to AVDD − 2.75 V

Key Features for AD5686RAD5686R: High relative accuracy (INL): ±2 LSB maximum @ 16 bits Low drift 2.5 V reference: 2 ppm/°C typical Total unadjusted error (TUE): ±0.1% of FSR maximum Offset error: ±1.5 mV maximum Gain error: ±0.1% of FSR maximum High drive capability: 20 mA, 0.5 V from supply rails User selectable gain of 1 or 2 (GAIN pin) Reset to zero scale or midscale (RSTSEL pin) 1.8 V logic compatibility 50 MHz SPI with readback or daisy chain Low glitch: 0.5 nV-sec Robust 4 kV HBM and 1.5 kV FICDM ESD rating Low power: 3.3 mW at 3 V 2.7 V to 5.5 V power supply	Key Features for ADuM5400ADuM5400: isoPower integrated, isolated dc-to-dc converter Regulated 5 V output 500 mW output power Quad dc-to-25 Mbps (NRZ) signal isolation channels Schmitt trigger inputs 16-lead SOIC package with >7.6 mm creepage High temperature operation: 105°C maximum High common-mode transient immunity: >25 kV/ìs

Devices Used for the EVAL-CN0229-SDPZEVAL-CN0229-SDPZ Evaluation Board

Key features for ADuM1301ADuM1301:

Qualified for automotive applications
Low power operation
5 V operation
1.2 mA per channel maximum @ 0 Mbps to 2 Mbps
3.5 mA per channel maximum @ 10 Mbps
32 mA per channel maximum @ 90 Mbps
3 V operation
0.8 mA per channel maximum @ 0 Mbps to 2 Mbps
2.2 mA per channel maximum @ 10 Mbps
20 mA per channel maximum @ 90 Mbps
Bidirectional communication
3 V/5 V level translation
High temperature operation: 125°C
High data rate: dc to 90 Mbps (NRZ)
Precise timing characteristics
2 ns maximum pulse width distortion
2 ns maximum channel-to-channel matching
High common-mode transient immunity: >25 kV/μs
Output enable function

Key Features for AD5750-2AD5750-2:

Current output ranges: 4 mA to 20 mA, 0 mA to 20 mA, 0 mA to 24 mA, ±20 mA, and ±24 mA
±0.03% full-scale range (FSR) total unadjusted error (TUE)
±5 ppm/°C typical output drift
Voltage output ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V with 20% overrange
±0.02% FSR TUE
±3 ppm/°C typical output drift
Flexible serial digital interface
On-chip output fault detection
Packet error checking (PEC)
Asynchronous CLEAR function
Flexible power-up condition to 0 V or tristate
Power supply range
AVDD: +12 V (± 10%) to +24 V (± 10%)
AVSS: −12 V (± 10%) to −24 V (± 10%)
Output loop compliance to AVDD − 2.75 V

Key Features for AD5686RAD5686R:

High relative accuracy (INL): ±2 LSB maximum @ 16 bits
Low drift 2.5 V reference: 2 ppm/°C typical
Total unadjusted error (TUE): ±0.1% of FSR maximum
Offset error: ±1.5 mV maximum
Gain error: ±0.1% of FSR maximum
High drive capability: 20 mA, 0.5 V from supply rails
User selectable gain of 1 or 2 (GAIN pin)
Reset to zero scale or midscale (RSTSEL pin)
1.8 V logic compatibility
50 MHz SPI with readback or daisy chain
Low glitch: 0.5 nV-sec
Robust 4 kV HBM and 1.5 kV FICDM ESD rating
Low power: 3.3 mW at 3 V
2.7 V to 5.5 V power supply

Key Features for ADuM5400ADuM5400:

isoPower integrated, isolated dc-to-dc converter Regulated 5 V output
500 mW output power
Quad dc-to-25 Mbps (NRZ) signal isolation channels Schmitt trigger inputs 16-lead SOIC package with >7.6 mm creepage
High temperature operation: 105°C maximum
High common-mode transient immunity: >25 kV/ìs

Kit Contents

The Analog Devices EVAL-CN0229-SDPZEVAL-CN0229-SDPZ kit is supplied with below contents:

Evaluation Board