Programmable Gain Amplifier PGA64 Operating Manual
The Multi Channel Systems device PGA64 amplifies analog signals with the option to change the gain. The input signal amplitude can be increased from a factor of 10 up to 5000. The gain is selectable by software and can be set for each of the 64 signal channels individually. The main parts consist of the analog filter stages, of a logic part to set the amplification, of an EEPROM to save the potentiometer settings, of a level converter accepting RS232 signals and of a power stage.
The signals of the 32 input channels are splitted to two different frequency bands. These bands filter the signals according to their frequency parts. The outputs are observable on the output connector. Examples of output signals are given. Two figures in the appendix demonstrate the dependance of the output signal amplitude from the frequency for the two used frequency bands.
Input signals are connected using a 68-pin SCSI connector. Output signals are transfered to other devices using a 68-pin SCSI connector, too. The pin layout of both connectors is given in a table. The digital signals to change the gain are delivered using a 9-pin SUB-D connector via the serial interface of a PC.
An internal power supply stage transforms the input voltages of any external power supply bin into the supply voltages of ±3.0 V and ±5.0 V. The supply bin should deliver raw voltages of ± 6.5 V at least, for connecting use 2 mm-connectors. The PGA64 uses a 3-pin LEMOSA connector as power supply input connector. The cable will be also delivered, too.
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