602616229AD5380_1_2_3EB_0| Application Note
Evaluation Board for 32-/40-Channel, 12-/14-Bit, Parallel and Serial Input, Voltage-Output DACs
EVAL-AD5380/81/82/83EB
FEATURES
Full-featured evaluation board On-board reference On-board ADC for MON_OUT voltage readback Link options Direct hook-up to printer port of PC PC software for control of DACs
Each channel has a programmable gain and offset adjust register. Each DAC output is gained and buffered on-chip. See the AD5380, AD5381, AD5382, and AD5383 data sheets for product details.
AD538x EVALUATION BOARD POWER SUPPLIES
The following external supplies must be provided: 5 V between the DVCC and DGND inputs for the digital supply of the AD538x. 5 V between the AVCC and AGND inputs for the analog supply of the AD538x.
INTRODUCTION
This evaluation board is for the AD5380, AD5381, AD5382, and AD5383, 32-/40-channel, 12-/14-bit DACs. The AD538x parts contain 32/40, 12-/14-bit DACs in one package. They have a maximum output voltage span of 5 V derived from a reference voltage of 2.5 V. The AD538x parts have a parallel interface in which 12/14 data bits are loaded into one of the input registers under the control of the WR, CS, and DAC channel address pins, A0 to A5. They also have a 2-wire I2C interface and a 3-wire serial interface, which are compatible with SPI , QSPITM, MICROWIRETM, and DSP interface standards. The DAC outputs are updated when the DAC registers receive new data. All the outputs can be updated simultaneously by taking the LDAC input low.
Both AGND and DGND inputs are provided on the board. The AGND and DGND planes are connected at one location close to the AD538x. Avoid connecting AGND and DGND elsewhere in the system to avoid ground loop problems. Each supply is decoupled to the relevant ground plane with 47 uF and 0.1 uF capacitors. Each device supply pin is again decoupled with a 10 uF and 0.1 uF capacitor pair to the relevant ground plane.
FUNCTIONAL BLOCK DIAGRAM
POWER SUPPLY INPUTS
2.5V REFERENCE V0 VOUT 0 VREF (+)
V39/MON_OUT
VOUT 39 PARALLEL INTERFACE 28-PIN HEADER
SERIAL INTERFACE 36-PIN CONNECTOR
AD5380 40-CHANNEL DAC
SERIAL INTERFACE 7-PIN HEADER
ADC
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
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04934-0-001
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