OPA818 2.7-GHz, 13-V, decompensated 7-V/V, FET-input operational amplifier | TI.com

OPA818 (PREVIEW) 2.7-GHz, 13-V, decompensated 7-V/V, FET-input operational amplifier

 

Sample Availability

Prototype samples are available (XOPA818IDRGT). Request Now

Description

The OPA818 is a decompensated (gain = 7 V/V stable), voltage-feedback operational amplifier with a low-noise junction gate field-effect transistor (JFET) input stage that combines high gain-bandwidth with a wide supply range from 6 V to 13 V for high-speed and wide dynamic range applications. This amplifier is manufactured using Texas Instruments’ proprietary, high-speed, silicon-germanium (SiGe) process to achieve significant performance improvements over other high-speed, FET-input amplifiers. A fast slew rate (1400 V/µs) provides high large-signal bandwidth and low distortion.

The 2.7-GHz gain-bandwidth, low 2.4-pF total input capacitance, and 2.2 nV/√Hz of noise makes the OPA818 an extremely versatile, wideband TIA photodiode amplifier for use in optical test and communication equipment, and many medical, scientific, and industrial instruments. The OPA818 can achieve over 85-MHz signal bandwidth in TIA configuration with 20-kΩ TIA gain (RF) and 0.5-pF photodiode capacitance (CD) with wide output swings. The decompensated, low-noise architecture with pico amperes of input bias current is also well-suited for high-gain test and measurement applications that have variable or high source impedance. Though normally stable in gains ≥ 7 V/V, the OPA818 can be used in applications with lower gains by applying noise-gain shaping techniques.

The OPA818 is available in an 8-lead WSON package with an exposed thermal pad for heat dissipation. This device is specified to operate over the industrial temperature range of –40°C to +85°C.

Features

  • High speed:
    • Gain-bandwidth product: 2.7 GHz
    • Bandwidth (G = 7 V/V): 790 MHz
    • Large-signal bandwidth (2 VPP): 400 MHz
    • Slew rate: 1400 V/µs
  • Decompensated gain: 7-V/V stable
  • Low noise:
    • Input voltage noise: 2.2 nV/√Hz
    • Input current noise: 2.5 fA/√Hz (f = 10 kHz)
  • Input bias current: 4 pA (typ)
  • Low input capacitance:
    • Common-mode: 1.9 pF
    • Differential mode: 0.5 pF
  • Low distortion (G = 7 V/V, RL = 1 kΩ, VO = 2 VPP):
    • HD2, HD3 at 1 MHz: –90 dBc, –96 dBc
    • HD2, HD3 at 50 MHz: –57 dBc, –72 dBc
  • Wide supply range: 6 V to 13 V
  • Output swing: 8 VPP (VS = 10 V)
  • Supply current: 27.7 mA
  • Shutdown supply current: 27 µA
  • Temperature range: –40°C to +85°C

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Parametrics

Compare all products in High-speed op amps (GBW>=50MHz) Email Download to Excel
Part number Order Architecture 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 1 kHz (Typ) (nV/rtHz) Iq per channel (Typ) (mA) Vos (offset voltage @ 25 C) (Max) (mV) Rail-to-rail Features Rating Operating temperature range (C) Package Group 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) @ MHz
OPA818 Order now FET / CMOS Input
Voltage FB    
1     6     13     790     7     1400     2.2     8.5     27.7     1.25     No     Decompensated     Catalog     -40 to 125     SON | 8     8SON: 9 mm2: 3 x 3 (SON | 8)     90     20     3     2700     60     -90     -96     1    
OPA657 Order now FET / CMOS Input
Voltage FB    
1     8     12     350     7     700     4.8     7     14     1.8     No     Decompensated     Catalog     -40 to 85     SOIC | 8
SOT-23 | 5    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5)    
89     20     2     1600     70     74     106     5