The OPA858 is a wideband, low-noise, operational amplifier with CMOS inputs for wideband transimpedance and voltage amplifier applications. When the device is configured as a transimpedance amplifier (TIA), the 5.5-GHz gain bandwidth product (GBWP) enables applications requiring high closed-loop bandwidths at transimpedance gains in the tens to hundreds of kΩs range.
The graph below demonstrates the bandwidth and noise performance of the OPA858 as a function of the photodiode capacitance when the amplifier is configured as a TIA. The total noise is calculated over a bandwidth range extending from DC to the calculated f-3dB frequency on the left-hand scale. The OPA858 package features a feedback pin (FB) that simplifies the feedback network connection between the input and the output.
The OPA858 is optimized for use in optical Time-of-Flight (ToF) systems like the one shown in the figure below where the OPA858 is used with the TDC7201 time-to-digital converter. The OPA858 can be used in high-resolution LIDAR systems with a high-speed analog-to-digital converter (ADC) and a differential output amplifier like the THS4541 or LMH5401 to drive the ADC.
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|Number of Channels (#)|
|Total Supply Voltage (Min) (+5V=5, +/-5V=10)|
|Total Supply Voltage (Max) (+5V=5, +/-5V=10)|
|BW @ Acl (MHz)|
|Acl, min spec gain (V/V)|
|Slew Rate (Typ) (V/us)|
|Vn at Flatband (Typ) (nV/rtHz)|
|Vn at 1kHz (Typ) (nV/rtHz)|
|Iq per channel (Typ) (mA)|
|Vos (Offset Voltage @ 25C) (Max) (mV)|
|Operating Temperature Range (C)|
|Package Size: mm2:W x L (PKG)|
|CMRR (Typ) (dB)|
|Input Bias Current (Max) (pA)|
|Offset Drift (Typ) (uV/C)|
|GBW (Typ) (MHz)|
|Output Current (Typ) (mA)|
|2nd Harmonic (dBc)|
|3rd Harmonic (dBc)|
|-40 to 125||-40 to 125||-40 to 95||-40 to 125|
|WSON | 8||WSON | 8||VQFN | 16||WSON | 8|
|See datasheet (WSON)||See datasheet (WSON)||16VQFN: 9 mm2: 3 x 3 (VQFN | 16)||See datasheet (WSON)|
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