AD624 PGA

Question

hi.. I am designing programmable gain low noise amplifier by using AD624 with AD7528 and AD712 . Can you please help me out with circuit operation and how can i change my gain using digital data.

ADIApproved · Accepted Answer

Hi, 
 The gain of the circuit is being controlled by the DAC. Data is transferred into either of the two DAC data latches via a common 8-bit TTL/CMOS compatible input port. Control input DAC A/DAC B determines which DAC is to be loaded. The AD7528’s load cycle is similar to the write cycle of a random access memory and the device is bus compatible with most 8-bit microprocessors. 
 Regards, 
 Mark)