LT5514 - Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain

Features

  • Click Here For LT5514 Evaluation Kits
  • Output IP3 at 100MHz: 47dBm
  • Maximum Output Power: 21dBm
  • Bandwidth: LF to 850MHz
  • Propagation Delay: 0.8ns
  • Maximum Gain: 33dB
  • Noise Figure: 7.3dB (Max Gain)
  • Gain Control Range: 22.5dB
  • Gain Control Step: 1.5dB
  • Gain Control Settling Time: 500ns
  • Output Noise Floor: –134dBm/Hz (Max Gain)
  • Reverse Isolation: –80dB
  • Single Supply: 4.75V to 5.25V
  • Low Power Mode
  • Shutdown Mode
  • Enable/Disable Time: 1µs
  • Differential I/O Interface
  • 20-Lead TSSOP Package

Typical Application

LT5514
LT5514
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Description

The LT5514 is a programmable gain amplifier (PGA) with bandwidth extending from low frequency (LF) to 850MHz. It consists of a digitally controlled variable attenuator, followed by a high linearity amplifier. The amplifier is configured with two identical transconductance amplifiers, hard wired in parallel with individual dedicated enable pins. When both amplifiers are enabled (Standard mode), the LT5514 offers an OIP3 of +47dBm (at 100MHz). Power dissipation can be reduced when a single amplifier is enabled (Low Power mode). Four parallel digital inputs control the gain over a 22.5dB range with 1.5dB step resolution. An on-chip power supply regulator/filter helps isolate the amplifier signal path from external noise sources.

The LT5514’s open-loop architecture offers stable operation for any practical load conditions, including peaking-free AC response when driving capacitive loads, and excellent reverse isolation.

The LT5514 may be operated broadband, where the output differential RC time constant sets the bandwidth, or it may be used as a narrowband driver with the appropriate output filter.

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Packaging

TSSOP-20

LT5514
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT5514EFE TSSOP 20 E $7.41 $5.20 View
LT5514EFE#PBF TSSOP 20 E $7.41 $5.20 View
LT5514EFE#TR TSSOP 20 E   $5.30 View
LT5514EFE#TRPBF TSSOP 20 E   $5.30 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC550A LT5514EFE | High Linearity Variable Gain IF Amp / ADC Driver $150.00
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Applications

  • High Linearity ADC Driver
  • IF Sampling Receivers
  • VGA IF Power Amplifier
  • 50 Ohm Driver
  • Instrumentation Applications
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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