PI200 User GuideLast updated: 2023-03-09 PDF version
You need to supply +5 V on the +Vcc pin and -5 V on the -Vcc pin. Do not apply any voltage outside this range on the board.
Setpoint can be adjusted between -2.5 V and +2.5 V with the SETPOINT trimmer. The setpoint can be modulated with the SETPOINT MOD input. Modulation input is DC coupled, gain is 1 V/V, 0.1 V/V or 0.01 V/V, depending on the MOD GAIN jumper.
The sign of the feedback for FAST OUT and SLOW OUT can be chosen with the FAST and SLOW jumpers (+1 or -1).
FAST and SLOW integrators are enabled with the INT EN switch ON. When the switched are OFF, the integrators can still be enabled by applying logic high signals on the FAST INT EN / SLOW INT EN pins.
A modulation can be added to the output of the slow integrator SLOW OUT via the RAMP IN pin.
Input / Output ranges
Input range is ±2 V on the IN and SETPOINT MOD inputs (50 Ω input impedance). Output range is ±2 V in the ERROR, FAST_OUT and SLOW_OUT outputs. ERROR and FAST_OUT have 50 Ω output impedance. SLOW_OUT has 1 kΩ output impedance.
Tuning the frequency response
The frequency response of the loop filter can be adjusted with the 3 blue rotary switches in clockwise order:
PROP: -13.3 dB / -6.6 dB / 0 dB / 6.6 dB / 13.3 dB / 20 dB / 26.6 dB.
FAST INT: 47 kHz / 100 kHz / 220 kHz / 470 kHz / 1 MHz / 2.2 MHz / 4.7 MHz.
SLOW INT (PI200 version): 800 mHz / 2.4 Hz / 8 Hz / 24 Hz / 80 Hz / 240 Hz / 800 Hz.
SLOW INT (PI200-T version): 8 mHz / 24 mHz / 80 mHz / 240 mHz / 800 mHz / 2.40 Hz / 8 Hz.