LMH6629_1011 Datasheet, PDF (1/28 Pages) National Semiconductor (TI) – Ultra-Low Noise, High-Speed Operational Amplifier with Shutdown

LMH6629
November 2, 2010
Ultra-Low Noise, High-Speed Operational Amplifier with
Shutdown
General Description
The LMH6629 is a high-speed, ultra low-noise amplifier de-
signed for applications requiring wide bandwidth with high
gain and low noise such as in communication, test and mea-
surement, optical and ultrasound systems.
The LMH6629 operates on 2.7 to 5.5V supply with an input
common mode range that extends below ground and outputs
that swing to within 0.8V 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 (LLP-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 SOT23-5 package is internally
set for a minimum stable gain of 10 V/V. The LLP-8 package
also provides the power-down enable/ disable feature.
The low-input noise (0.69nV/√Hz and 2.6 pA/√Hz), low dis-
tortion (HD2/ HD3 = −90 dBc/−94 dBc) and ultra-low DC
errors (800 µV V_OS maximum over temperature, ±0.45 µV/°C
drift) allow precision operation in both AC- and DC-coupled
applications.
The LMH6629 is fabricated in National Semiconductor’s pro-
prietary SiGe process and is available in a 3mm x 3mm 8-pin
LLP, as well as the SOT23-5, package.
Features
Specified for V_S = 5V, R_L = 100Ω, A_V = 10V/V LLP-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 = 1MHz, 2V}_PP
−90 dBc
■ ^{HD3 @ f = 1MHz, 2V}_PP
−94 dBc
■ ^{Supply voltage range}
2.7V to 5.5V
■ ^{Typical supply current}
15.5 mA
■ ^{Selectable min. gain}
≥4 or ≥10 V/V
■ ^{Enable Time}
75 ns
■ ^{Output Current}
±250 mA
■ ^{LLP-8 and SOT23-5 Packages}
Applications
■ ^{Instrumentation Amplifiers}
■ ^{Ultrasound Pre-amps}
■ ^{Wide-band Active Filters}
■ ^{Opto-electronics}
■ ^{Medical imaging systems}
■ ^{Base-station Amplifiers}
■ ^{Low-Noise Single Ended to Differential Conversion}
■ ^{Trans-impedance amplifier}
Typical Application Circuit
30068011
FIGURE 1. Transimpedance Amplifier
© 2010 National Semiconductor Corporation 300680
www.national.com