OPA858 5.5 GHz Gain Bandwidth Product, Decompensated Transimpedance Amplifier with FET Input | TI.com

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5.5 GHz Gain Bandwidth Product, Decompensated Transimpedance Amplifier with FET Input



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.


  • High Gain Bandwidth Product: 5.5 GHz
  • Decompensated, Gain ≥ 7 V/V (Stable)
  • Ultra-Low Bias Current MOSFET Inputs: 10 pA
  • Low Input Voltage Noise: 2.5 nV/√Hz
  • Slew rate: 2000 V/µs
  • Low Input Capacitance:
    • Common-Mode: 0.6 pF
    • Differential: 0.2 pF
  • Wide Input Common-Mode Range:
    • 1.4 V from Positive Supply
    • Includes Negative Supply
  • 2.5 VPP Output Swing in TIA Configuration
  • Supply Voltage Range: 3.3 V to 5.25 V
  • Quiescent Current: 20.5 mA
  • Available in 8-Pin WSON Package
  • Temperature Range: –40 to +125°C

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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$)
OPA858 Order now 1     5500     5.25     3.3     2.5     No     Shutdown
1200     -40 to 125     WSON | 8     8WSON: 4 mm2: 2 x 2 (WSON | 8)     2.50 | 1ku    
OPA855 Order now 1     8000     5.25     3.3     2.5     No     Shutdown
2500     -40 to 125     WSON | 8     8WSON: 4 mm2: 2 x 2 (WSON | 8)     2.75 | 1ku    
OPA857 Order now 1     6800     3.6     2.3     10     No     Integrated TIA     130     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)     2.59 | 1ku    
OPA857-DIE Samples not available 1     6800     3.6     2.3       No     Integrated TIA     130     -40 to 85