Other Parts Discussed in Thread: ADS8900B, TINA-TI
Hi Team,
I've completed a design using THS4551 to convert my single-ended +/-5V(10Vpp) sine signal to a differential signal. The differential input is fed to the differential input of the ADC ADS8900B.
The circuit is exactly the same as the diagram below except for some changes I've mentioned.
The 1nF capacitors at both the feedback are replaced with 100pF capacitors and a 1nF capacitor is placed in between the inputs of the differential amplifier.
The Vocm is exactly half of the reference voltage 4.5V. We are using a voltage divider to get the half reference voltage output.
Our input is about 8VPP and the VCC is roughly about 4.8V, but the problem is the differential output is 2.9VPP.
What is the reason for such a low output?. I think the voltage drop across the 1-kilo ohm series resistor is very high. Can I lower it if it the case?. But in the simulation in LT spice with a similar differential amplifier (LTC1992), my differential output is around 4.5VPP with a 1-kilo ohm series resistor.
Also, is there any simulation software available for this kind of amplifier like LT spice?.
