Hello Yoshida-san,
It seems that you are operating the PGA870 in "No latch" mode because the LATCH pins and GAIN_STROBE pins are pulled up to 5V. In this condition as Loren mentioned, the gain settling time would be dependent upon the race co…
Hi Jim Karki, is it possible to shift supply between +3.5V and -1.5V to perform a common-mode level near 1V for DC coupling without using a resistor network? In this case the mid-supply is now 1V, can I tie the undriven input to this value or to GND? should…
Other Parts Discussed in Thread: PGA870 , TINA-TI While simulating the PGA870 with the supplied spice model in spice (spice3f5?) I get the follow error:
To few devs: f7a2e7d91a3c61eb88efe07d71e3bde5f3ef006d813376c6f627a228a81f4a556312313d5d1ca5ddece7a…
Thanks for the Reply.
PGA870 is a good suggestion, completely missed the part about dual supply in the datasheet.
Will check out the spice model. Only issue maybe to achieve the required gain, i may have to go with 3 stage of pga.
Hi Paul,
Yes, the PGA870 (650-MHz) is a high-speed, fully differential programmable gain amplifier which is probably a much better fit to drive a high-speed pipeline ADC. The PGA870 is supported by a different team, and I will need to refer your question…
Part Number: PGA870EVM Other Parts Discussed in Thread: PGA870 How can I modify the board to make it fully-differential? Because default circuit has negative input and output are grounded.
I tried to remove R2 and R17 and put 0 Ohm resistor at R20. In…
Part Number: ADC14C105 Other Parts Discussed in Thread: PGA870 Hello,
I didn't found the input impedance for this ADC in the datasheet. For some calculation and matching with a PGA870 I'm intessted in this data.
Do you can provide me this data…
Ryan,
The problem will be the response of the transformers at the ADC input that convert SE to DE for the ADC interface. Transformers typically have a HP corner around 1M or so.
Ch D of the C48 EVM does provide an optional PGA870 path (see the schematic…
Other Parts Discussed in Thread: PGA870 These are general purpose questions arisen from studying PGA870 (High bandwidth Variable Gain Amplifier) data sheet:
Q1.- Return loss specifications and plots for differential input (fig 36) are impressive: better…
Other Parts Discussed in Thread: ADS5463 , PGA870 Hello!
Problems with ADC ADS5463 Friends, help to understand the problem. Translate simple input, to output A/D CONVERTERS for 250 units of data removed.
Shifting constantly. CLKIN = 65 MHz, Vref = 2.4…
