Other Parts Discussed in Thread: TLV3401, TINA-TI, OPA348, ADS1298
I am willing to use the HW pace detection circuit with DVDD=3.3V and bipolar supply for AVDD/AVSS=+/- 2.5V with respect to GND.
I have three questions:
1. Does the AVDD/AVSS and DVDD range have an impact on the pace amplifier output voltage range ?
2. The input voltage in the simulation presented in TIPD111 seems to be 2mV but the pace amplifier has a gain of 0.4. As a result, a 2mV pace signal will only have an amplitude of 0.8mV on the input of the pace detection circuit.
Note: It assumes that PGA Gain = 1.
Shall I change the values of R1 and C2 (A.1. Electrical Schematic of SLAU511-June 2013-Revised June 2013) ? If so, can you provide the calculation with PGA as a variable ?
3. As a result, the thresholds V1 and V2 shall be modified as the worst case dV is modified (from 2mV to 0.8mV) but worst case dt is not modified (100us): do you confirm it ?
Thank you for your help,