Part Number: ONET8501T
Other Parts Discussed in Thread: ONET8551T, OPA3S2859, LMH32401
Hello TI Experts:
Good day.
We are currently looking for an optical TIA for NB AOI applications. Specific hardware requirements are as follows:
Message Type: NRZ Pulse Signal
Bandwidth: > 180 MHz
Transistor Gain: 5k Ohm
Input Current: 10uA ~ 50uA (Source Mode Support Required)
Key Requirement 1: Must support MGC (Manual Gain Control) (The customer is considering system response speed and does not accept purely automatic control)
Key Requirement 2: Must have RSSI monitoring function
Output: Single-ended or Differential are both OK.
Current Problem: We evaluated the ONET8551T (or ONET85x1T series), but this series uses an AGC (Automatic Gain Control)/limiting architecture internally, which cannot initially support the MGC function we need.
Therefore, we would like to ask:
1.) Is it possible to implement MGC control through external circuitry with the ONET8551T?
2.) If the ONET series cannot handle MGC externally, are there any other recommended TIA products for the above requirements? Or what kind of discrete architecture (e.g., OPA + VGA) is suggested to simultaneously meet MGC and RSSI needs?
Thank you!
