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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|Part number||Order||Number of channels (#)||GBW (Typ) (MHz)||Total supply voltage (Max) (+5V=5, +/-5V=10)||Total supply voltage (Min) (+5V=5, +/-5V=10)||Vos (offset voltage @ 25 C) (Max) (mV)||Rail-to-rail||Features||BW @ Acl (MHz)||Operating temperature range (C)||Package Group||Package size: mm2:W x L (PKG)||Approx. price (US$)|
|1200||-40 to 125||WSON | 8||8WSON: 4 mm2: 2 x 2 (WSON | 8)||2.20 | 1ku|
|2500||-40 to 125||WSON | 8||8WSON: 4 mm2: 2 x 2 (WSON | 8)||2.42 | 1ku|
||1||6800||3.6||2.3||10||No||Integrated TIA||130||-40 to 85||VQFN | 16||16VQFN: 9 mm2: 3 x 3 (VQFN | 16)||2.28 | 1ku|
|OPA857-DIE||Samples not available||1||6800||3.6||2.3||No||Integrated TIA||130||-40 to 85|