LMH6514_14 Datasheet, PDF (7/29 Pages) Texas Instruments – LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier

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Pin Number
Analog I/O
6
7
15
14
16
13
Power
3
5,8
Digital Inputs
11,10,9
2
Symbol
IN+
IN−
OUT−
OUT+
LOAD−
LOAD+
V_CC
GND
GAIN_0 to
GAIN_2
LATCH
1,4,12
NC
LMH6514
PIN DESCRIPTIONS
Description
SNOSB06 – JANUARY 2008
Non-inverting analog input. Internally biased to 1.4V. Input voltage should not exceed V_CC or
go below GND by more than 0.5V.
Inverting analog input. Internally biased to 1.4V. Input voltage should not exceed V_CC or go
below GND by more than 0.5V. If using amplifier single ended this input should be capacitively
coupled to ground.
Open collector inverting output. This pin is an output that also requires a power source. This
pin should be connected to 5V through either an RF choke or an appropriately sized inductor
that can form part of a filter. See Application Information for details.
Open collector non-inverting output. This pin is an output that also requires a power source.
This pin should be connected to 5V through either an RF choke or an appropriately sized
inductor that can form part of a filter. See Application Information for details.
Internal 200Ω resistor connection to pin 15. This pin can be left floating for higher gain or
shorted to pin 13 for lower gain and lower effective output impedance. See Application
Information for details.
Internal 200Ω resistor connection to pin 14. This pin can be left floating for higher gain or
shorted to pin 16 for lower gain and lower effective output impedance. See Application
Information for details.
5V power supply pin. Use ceramic, low ESR bypass capacitors. This pin powers everything
except the output stage.
Ground pins. Connect to low impedance ground plane. All pin voltages are specified with
respect to the voltage on these pins. The exposed thermal pad is also a ground connection.
Gain setting pins. See above table for gain step sizes for each pin. These pins are 3.3V CMOS
logic compatible. 5V inputs may cause damage.
This pin controls the function of the gain setting pins mentioned above. With LATCH in the
logic HIGH state the gain is fixed and will not change. With the LATCH in the logic LOW state
the gain is set by the state of the gain control pins. Any changes in gain made with the LATCH
pin in the LOW state will take effect immediately. This pin is 3.3V CMOS logic compatible. 5V
inputs may cause damage.
These pins are not connected. They can be grounded or left floating.
Copyright © 2008, Texas Instruments Incorporated
Product Folder Links: LMH6514
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