I just want information about the spice model of AD7541 12-bit CMOS DAC, And AD524 Precision instrumentation amplifier. I want these 2 IC's in ORCAD CAPTURE to model my circuit. I will be greatful if you can you just please guide me where can i download or can you just send spice model (*.lib), symbol (*.olb) files to simulate in ORCAD.
Thanking you in advance.
Satish kumar B,
ISRO satellite centre,
Unfortunately we do not have any Spice model. I would suggest to have a look at the equivalent circuit of a CMOS DAC (see below) as a help:
Co is the output capacitance of the DAC switches (code dependent).
Rs is the output resistance seen between OUT1 and OUT2 with Vref at ground (code dependent).
R is the input resistance.
RFB is the feedback resistor.