(ACTIVE) Ultra-Low Noise, High-Speed Operational Amplifier with Shutdown


Transimpedance Amplifier


The LMH6629 is a high-speed, ultra-low noise amplifier designed for applications requiring wide bandwidth with high gain and low noise such as in communication, test and measurement, optical and ultrasound systems.

The LMH6629 operates on 2.7-V to 5.5-V supply with an input common mode range that extends below ground and outputs that swing to within 0.8 V of the rails for ease of use in single supply applications. Heavy loads up to ±250 mA can be driven by high-frequency large signals with the LMH6629’s –3dB bandwidth of 900 MHz and 1600 V/µs slew rate. The LMH6629 (WSON-8 package only) has user-selectable internal compensation for minimum gains of 4 or 10 controlled by pulling the COMP pin low or high, thereby avoiding the need for external compensation capacitors required in competitive devices. Compensation for the SOT-23-5 package is internally set for a minimum stable gain of 10 V/V. The WSON-8 package also provides the power-down enable/disable feature.

The low-input noise (0.69 nV/√Hz and 2.6 pA/√Hz), low distortion (HD2/HD3 = −90 dBc/−94 dBc) and ultra-low DC errors (800 µV VOS maximum over temperature, ±0.45 µV/°C drift) allow precision operation in both ac- and dc-coupled applications.

The LMH6629 is fabricated in Texas Instruments’ proprietary SiGe process and is available in a 3 mm × 3 mm 8-pin WSON package as well as the SOT-23-5 package.


  • Specified for VS = 5 V, RL = 100 Ω, AV = 10V/V
    WSON-8 Package, unless Specified. –3dB
    Bandwidth 900 MHz
  • Input Voltage Noise 0.69 nV/√Hz
  • Input Offset Voltage Max. Over Temperature
    ±0.8 mV
  • Slew Rate 1600 V/ µs
  • HD2 @ f = 1 MHz, 2VPP −90 dBc
  • HD3 @ f = 1 MHz, 2VPP −94 dBc
  • Supply Voltage Range 2.7 V to 5.5 V
  • Typical Supply Current 15.5 mA
  • Selectable Min. Gain ≥4 or ≥10 V/V
  • Enable Time: 75 ns
  • Output Current ±250 mA
  • WSON-8 and SOT-23-5 Packages


Architecture Bipolar^Voltage FB   
Number of Channels (#) 1   
Total Supply Voltage (Min) (+5V=5, +/-5V=10) 2.7   
Total Supply Voltage (Max) (+5V=5, +/-5V=10) 5.5   
BW @ Acl (MHz) 900   
Acl, min spec gain (V/V) 4   
Slew Rate (Typ) (V/us) 1100   
Vn at Flatband (Typ) (nV/rtHz) 0.69   
Vn at 1kHz (Typ) (nV/rtHz) 0.69   
Iq per channel (Typ) (mA) 15.5   
Vos (Offset Voltage @ 25C) (Max) (mV) 0.78   
Rail-to-Rail No   
Features Decompensated   
Rating Catalog   
Operating Temperature Range (C) -40 to 125   
Package Group SOT-23^WSON   
Package Size: mm2:W x L (PKG) 5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)^See datasheet (WSON)   
CMRR (Typ) (dB) 87   
Input Bias Current (Max) (pA) 23000   
Offset Drift (Typ) (uV/C) 0.45   
GBW (Typ) (MHz) 4000   
Output Current (Typ) (mA) 250   
2nd Harmonic (dBc) 88   
3rd Harmonic (dBc) 74   
@ MHz 1   

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