The OPA855 is a wideband, low-noise operational amplifier with bipolar inputs for wideband transimpedance and voltage amplifier applications. When the device is configured as a transimpedance amplifier (TIA), the 8-GHz gain bandwidth product (GBWP) enables high closed-loop bandwidths at transimpedance gains of up to tens of kΩs.
The following graph shows the bandwidth and noise performance of the OPA855 as a function of the photodiode capacitance when the amplifier is configured as a TIA. The total noise is calculated along a bandwidth range extending from DC to the calculated frequency (f) on the left scale. The OPA855 package has a feedback pin (FB) that simplifies the feedback network connection between the input and the output.
The OPA855 is optimized to operate in optical time-of-flight (ToF) systems where the OPA855 is used with time-to-digital converters, such as the TDC7201. Use the OPA855 to drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDAR systems with a differential output amplifier, such as the THS4541 or LMH5401.
PART NUMBER(1) | PACKAGE | BODY SIZE (NOM) |
---|---|---|
OPA855 | WSON (DSG, 8) | 2.00 mm × 2.00 mm |
Changes from Revision B (January 2022) to Revision C (January 2023)
Changes from Revision A (October 2018) to Revision B (January 2022)
Changes from Revision * (July 2018) to Revision A (October 2018)
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
FB | 1 | I | Feedback connection to output of amplifier |
IN– | 3 | I | Inverting input |
IN+ | 4 | I | Noninverting input |
NC | 2 | — | Do not connect |
OUT | 6 | O | Amplifier output |
PD | 8 | I | Power down connection. PD = logic low = power off mode; PD = logic high = normal operation. |
VS– | 5 | — | Negative voltage supply |
VS+ | 7 | — | Positive voltage supply |
Thermal pad | — | Connect the thermal pad to VS– |
PAD | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
FB | 1 | I | Feedback connection to output of amplifier |
IN– | 3 | I | Inverting input |
IN+ | 4 | I | Noninverting input |
NC | 2,5,6,13 | — | Do not connect |
OUT | 9 | O | Amplifier output |
PD | 12 | I | Power down connection. PD = logic low = power off mode; PD = logic high = normal operation. |
VS– | 7,8 | — | Negative voltage supply |
VS+ | 10,11 | — | Positive voltage supply |
Backside | — | Connect to VS– |