LMH6732MFXSLASHNOPB datasheet(17/29 Pages) TI1

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LMH6732

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SNOSA47B – FEBRUARY 2003 – REVISED MARCH 2013

Table 1. Device Parameters Related to Supply Current

Specification

Effect as ICC Increases

Bandwidth

Increases

Rise Time

Decreases

Enable/ Disable Speed

Increases

Output Drive

Increases

Input Bias Current

Increases

Input Impedance

Decreases (see Source impedance Discussion)

Both the Electrical Characteristics pages and the TYPICAL PERFORMANCE CHARACTERISTICS section

illustrate these effects to help make the supply current vs. performance trade-off. The supply current is adjustable

over a continuous range of more than 10 to 1 with a single resistor, RP, allowing for easy trade-off between

power consumption and speed. Performance is specified and tested at ICC = 1mA, 3.4mA, and 9mA. (Note:

Some test conditions and especially the load resistances are different for the three supply current settlings.) The

performance plots show typical performance for all three supply currents levels.

When making the supply current vs. performance trade-off, it is first a good idea to see if one of the standard

operating points (ICC = 1mA, 3.4mA, or 9mA) fits the application. If it does, performance ensured on the

specification pages will apply directly to your application. In addition, the value of RP may be obtained directly

from the Electrical Characteristics pages.

BEYOND 1GHz BANDWIDTH

As stated above, the LMH6732 speed can be increased by increasing the supply current. The

−3dB Bandwidth

can even reach the unprecedented value of 1.5GHz (AV = +2, VOUT = 0.25VPP). Of course, this comes at the

expense of power consumption (i.e. supply current). The relationship between

−3dB BW and supply current is

shown in Figure 48 to Figure 50. The supply current would nominally have to be set to around 10mA to achieve

this speed. The absolute maximum supply current setting for the LMH6732 is 14mA. Beyond this value, the

operation may become unpredictable.

The following discussion will assist in selecting ICC for applications that cannot operate at one of the

specified supply current settlings.

Use the typical performance plots for critical specifications to select the best ICC. For parameters containing

Min/Max ratings in the data sheet tables, interpolate between the values of ICC in the plots & specification tables

to estimate the max/min values in the application.

The simplified schematic for the supply current setting path (IP) is shown below in Figure 61.

Figure 61. Supply Current Control's Simplified Schematic

The terminal marked "RP" is tied to a potential through a resistor RP. The current flowing through RP (IP) sets the

LMH6732's supply current. Throughout the data sheet, the voltages applied to RP and V

− are both considered to

−5V. However, the two potentials do not necessarily have to be the same. This is beneficial in applications

where non-standard supply voltages are used or when there is a need to power down the op amp via digital logic

control.

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