LMH6523_15 Datasheet, PDF (15/33 Pages) Texas Instruments – High Performance Quad DVGA

LMH6523
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APPLICATION INFORMATION
SNOSC88 – DECEMBER 2012
INTRODUCTION
The LMH6523 is a fully differential amplifier optimized for signal path applications up to 400 MHz. The LMH6523
has a 100Ω input and a low impedance output. The gain is digitally controlled over a 31 dB range from +26dB to
−5dB. The LMH6523 is optimized for accurate gain steps and minimal phase shift combined with low distortion
products. This makes the LMH6523 ideal for voltage amplification and an ideal analog to digital converter (ADC)
driver where high linearity is necessary.
RF
LO
100O
FILTER
0.01 F
V_CC
1H
100: ¼ LMH6523
40.2O
100O
FILTER
0.01 F
ADC
0.01 F
5
GAIN 0-4
ENABLE
40.2O 0.01 F
1H
100O
Figure 42. LMH6523 Typical Application
SVA-30206534
+5V
INA+
INA-
INB+
INB-
ATTEN_A
EN_A
SPI
ATTEN_D
EN_D
Attenuator
0dB to 31dB
Attenuator
0dB to 31dB
5
Digital
4
Control,
(Serial
5
or
Parallel)
INC+
INC-
IND+
IND-
Attenuator
0dB to 31dB
Attenuator
0dB to 31dB
26dB
OUTA+
OUTA-
26dB
OUTB+
OUTB-
5
ATTEN_B
EN_B
MODE
5
ATTEN_C
EN_C
26dB
26dB
OUTC+
OUTC-
OUTD+
OUTD-
GND
SVA-30206532
Figure 43. LMH6523 Block Diagram
Copyright © 2012, Texas Instruments Incorporated
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