LMH6503MT National Semiconductor, LMH6503MT Datasheet - Page 18

• Manufacturer Part Number: LMH6503MT
• Description: AMP, WIDEBAND, VARIABLE GAIN, 6503
• Manufacturer: National Semiconductor

Specifications of LMH6503MT

• No. Of Amplifiers: 1
• Bandwidth: 135MHz
• Gain Accuracy: 4.4dB
• No. Of Channels: 1
• Supply Voltage Range: 5V To 12V
• Amplifier Case Style: TSSOP
• No. Of Pins: 14
• Operating Temperature Range: -40°C To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Application Circuits
FOUR-QUADRANT MULTIPLIER
Applications requiring multiplication, squaring or other non-
linear functions can be implemented with four-quadrant mul-
tipliers. The LMH6503 implements a four-quadrant multiplier
as illustrated in Figure 11:
FREQUENCY SHAPING
Frequency shaping and bandwidth extension of the
LMH6503 can be accomplished using parallel networks con-
nected across the R
Figure 12 schematic will effectively extend the LMH6503’s
bandwidth.
FIGURE 11. Four Quadrant Multiplier
FIGURE 12. Frequency Shaping
G
ports. The network shown in the
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2
The LMH6503 Variable-Gain Amplifier placed into a feed-
back loop provides signal processing function such as in a
2nd order tunable bandpass filter. The center frequency of
the 2nd order bandpass shown in Figure 13 is adjusted
through the use of the LMH6503’s gain control voltage, V
The integrators implemented with two sections of a
LMH6682, provide the coefficients for the transfer function.
nd
ORDER TUNABLE BANDPASS FILTER
FIGURE 13. Tunable Bandpass Filter
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G
.