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LMH6514
www.ti.com
SNOSB06 – JANUARY 2008
LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier
Check for Samples: LMH6514
1
FEATURES
DESCRIPTION
The LMH6514 is a high performance, digitally
2
Adjustable Gain with a 42 dB Range
controlled variable gain amplifier (DVGA). It combines
Precise 6.02 dB Gain Steps
precision gain control with a low noise, ultra-linear,
Parallel 3 Bit Gain Control
differential amplifier. Typically, the LMH6514 drives a
high performance ADC in a broad range of mixed
On Chip Register Gain Setting
signal and digital communication applications such as
Fully Differential Signal Path
mobile
radio
and
cellular
base
stations
where
Single Ended to Differential Capable
automatic gain control (AGC) is required to increase
system dynamic range. When used in conjunction
200
Ω Input Impedance
with a high speed ADC, system dynamic range can
Small Footprint (4 mm x 4 mm) WQFN Package
be extended by up to 42 dB.
The LMH6514 has a differential input and output
APPLICATIONS
allowing large signal swings on a single 5V supply. It
Cellular Base Stations
is designed to accept signals from RF elements and
IF Sampling Receivers
maintain a terminated impedance environment. The
input impedance is 200
Ω resistive. The output
Instrumentation
impedance is either 200
Ω or 400Ω and is user
Modems
selectable. A unique internal architecture allows use
Imaging
with both single ended and differential input signals.
Differential Line Receiver
Input signals to the LMH6514 are scaled by a highly
linear,
digitally
controlled
attenuator
with
seven
KEY SPECIFICATIONS
accurate 6 dB steps. The attenuator output provides
the input signal for a high gain, ultra linear differential
600 MHz bandwidth at 100
Ω load
transconductor. The transconductor differential output
39 dBm OIP3 at 75 MHz, 200
Ω load
current can be converted into a voltage by using the
26 dB to 38 dB maximum gain
on-chip 200
Ω or 400Ω loads. The transconductance
gain is 0.1 Amp/Volt resulting in a maximum voltage
Selectable output impedance of 200
Ω or 400Ω.
gain of +32 dB when driving a 200
Ω load, or 38 dB
8.3 dB noise figure
when driving the 400
Ω load. On chip digital latches
5 ns gain step switching time
are provided for local storage of the gain setting. The
gain step settling time is 5 ns and care has been
100 mA supply current
taken to reduce the sensitivity of bandwidth and
phase to gain setting.
The
LMH6514
operates
over
the
industrial
temperature range of
−40°C to +85°C. The LMH6514
is available in a 16-Pin, thermally enhanced, WQFN
package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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