EVAL_AD5532_AD5533_Rev0| Application Note
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FEATURES Full-Featured Evaluation Board for the AD5532/AD5533 On-Board 3V Reference Various Link and Switch Options PC Software for Control af AD5532/AD5533 Socketed AD5532/AD5533 for Easy Replacement INTRODUCTION
Evaluation Board for 32 Channel, Infinite Sample-and-Hold EVAL-AD5532EB
provide an analog input voltage to the AD5532/AD5533. There are various link and switch options which are explained in detail on page 2. Interfacing to this board from a PC is through a 36-way Centronics connector. This 36-way connector is compatible with most printer cables and is usually connected to the parallel printer port on a standard PC via a standard printer cable.
OPERATING THE AD5532 EVALUATION BOARD Power Supplies
This Technical Note describes the evaluation board for the AD5532 and AD5533. These devices combine a 32 channel voltage translation function with an infinite output hold capability. An analog input voltage on the common input pin, Vin, is sampled and its digital representation transferred to a chosen DAC register. The output of this DAC is then updated to reflect the new contents of the DAC register. Channel selection is accomplished via the parallel address inputs A0-A5 or via the serial input port. The AD5532 is operated with AVcc= +5V+/-5%, DVcc= 2.5V to 5.25V, Vss= -4.75V to -16.5V, Vdd= 10V to 16V and requires a stable +3V reference on the REF_IN pin as well as an offset voltage on OFFS_IN. These devices are available in a 74lead LFBGA package. Full datails are available in the AD5532 and AD5533 datasheets from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board. On-board components include an AD780 which is a pin programmable +3V ultra high pr
ecision bandgap reference and an AD5541 which is a 16-bit DAC that can be used to
The following external supplies must be provided: +5V between the DVCC and DGND inputs which supplies the DVCC pins on the AD5532. +5V between the AVCC and the AGND inputs to supply the AD780, the AD5541, the AD820 and the AVCC pins on the AD5532. -15V to the VSS input to supply the AD5532 AVSS pins. +15V to the VDD input to supply the AD5532 AVDD pins. Each supply is decoupled to the relevant ground plane with a 47uF and a 0.1uF capacitor pair as it enters the board. Each device supply pin is again decoupled with a 10uF and a 0.1uF capacitor pair to the relevant ground plane. There are 2 ground planes on the board, AGND and DGND. These are connected together at one location close to the AD5532. It is recommended not to connect these anywhere else to avoid ground loop problems.
FUNCTIONAL BLOCK DIAGRAM
Power Supply Inputs
V0
V0
3V Reference
AD5532/33 32-Channel DAC/SHA
Ain
External Ain DAC
Seri al Inte rfa ce 36 p in C o nn ec to r
V31
V31 Parallel Interface 14 pin Header
REV. 0 04/00
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