LMH6517_14 Datasheet, PDF (1/34 Pages) Texas Instruments – Low Power, Low Noise, IF and Baseband, Dual 16 bit ADC Driver With Digitally Controlled Gain

LMH6517
www.ti.com
SNOSB19J – NOVEMBER 2008 – REVISED NOVEMBER 2011
Low Power, Low Noise, IF and Baseband, Dual 16 bit ADC Driver With Digitally Controlled
Gain
Check for Samples: LMH6517
FEATURES
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•2 Accurate, 0.5dB Gain Steps
• 200Ω Resistive, Differential Input
• Low Impedance, Differential Output
• Disable Function for Each Channel
• Parallel Gain Control
• SPI Compatible Serial Bus
• Two Wire, Pulse Mode Control
• On Chip Register Stores Gain Setting
• Low Sensitivity of Linearity and Phase to Gain
Setting
• Single 5V Supply Voltage
• Small Footprint WQFN Package
APPLICATIONS
• Cellular Base Stations
• IF Sampling Receivers
• Instrumentation
• Modems
• Imaging
KEY SPECIFICATIONS
• OIP3: 43dBm @ 200MHz
• Noise figure 5.5dB
• Gain step size of 0.5dB
• Gain step accuracy: 0.05dB
• Frequency Range of 1200 MHz
• Supply current 80mA per channel
DESCRIPTION
The LMH6517 contains two high performance,
digitally controlled variable gain amplifiers (DVGA). It
has been designed for use in narrowband and
broadband IF sampling applications. Typically the
LMH6517 drives a high performance ADC in a broad
range of mixed signal and digital communication
applications such as mobile radio and cellular base
stations where automatic gain control (AGC) is
required to increase system dynamic range.
Each channel of LMH6517 has an independent,
digitally controlled attenuator and a high linearity,
differential output amplifier. Each block has been
optimized for low distortion and maximum system
design flexibility. Each channel can be individually
disabled for power savings.
The LMH6517 digitally controlled attenuator provides
precise 0.5dB gain steps over a 31.5dB range. On
chip digital latches are provided for local storage of
the gain setting. Both serial and parallel programming
options are provided. A Pulse mode is also offered
where simple up or down commands can change the
gain one step at a time.
The output amplifier has a differential output allowing
large signal swings on a single 5V supply. The low
impedance output provides maximum flexibility when
driving filters or analog to digital converters.
The LMH6517 operates over the industrial
temperature range of −40°C to +85°C. The LMH6517
is available in a 32-Pin, thermally enhanced, WQFN
package.
Typical Application: IF Sampling Receiver
V_CC
RF
200 ½ LMH6517
ADC
LO
6
GAIN 0-5
LATCH
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PRODUCTION DATA information is current as of publication date.
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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