LMH6611 Datasheet, PDF (21/42 Pages) Intersil Corporation – PowerWise® Single Supply 345 MHz Rail-to-Rail Output Amplifiers

LMH6611, LMH6612
www.ti.com
SNOSB00K – NOVEMBER 2007 – REVISED OCTOBER 2013
APPLICATION INFORMATION
The LMH6611 and LMH6612 are based on proprietary VIP10 dielectrically isolated bipolar process. This device
family architecture features the following:
• Complimentary bipolar devices with exceptionally high f_t (∼8 GHz) even under low supply voltage (2.7V) and
low bias current.
• Common emitter push-push output stage. This architecture allows the output to reach within millivolts of either
supply rail.
• Consistent performance with little variation from any supply voltage (2.7V - 11V) for the most important
specifications (BW, SR, I_OUT, for example.)
• Significant power saving compared to competitive devices on the market with similar performance.
With 3V supplies and a common mode input voltage range that extends beyond either supply rail, the LMH6611
is well suited to many low voltage/low power applications. Even with 3V supplies, the −3 dB BW (at A_V = +1) is
typically 305 MHz.
The LMH6611 and LMH6612 are designed to avoid output phase reversal. With input overdrive, the output is
kept near the supply rail (or as close to it as mandated by the closed loop gain setting and the input voltage).
Figure 66 shows the input and output voltage when the input voltage significantly exceeds the supply voltages.
V_IN
V_OUT
V⁺ = +2.5V
V^- = -2.5V
A_V = +1
R_F = 560:
R_L = 1 k:
25 ns/DIV
Figure 66. Input and Output Shown with CMVR Exceeded
If the input voltage range is exceeded by more than a diode drop beyond either rail, the internal ESD protection
diodes will start to conduct. The current flow in these ESD diodes should be externally limited.
SHUTDOWN CAPABILITY AND TURN ON/OFF BEHAVIOR
The LMH6611 can be shutdown by connecting the DISABLE pin to a voltage 0.5V below the supply midpoint
which will reduce the supply current to typically 120 µA. The DISABLE pin is “active low” and can be connected
through a resistor to V⁺ or left floating for normal operation. Shutdown is specified when the DISABLE pin is 0.5V
below the supply midpoint at any operating supply voltage and temperature. Typical turn on time is 20 ns and the
turn off time is 60 ns.
In the shutdown mode, essentially all internal device biasing is turned off in order to minimize supply current flow
and the output goes into high impedance mode. During shutdown, the input stage has an equivalent circuit as
shown in Figure 67.
Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LMH6611 LMH6612
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