LT5524 - Low Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain

Features

• Output IP3 at 100MHz: 40dBm
• Maximum Output Power: 16dBm
• Bandwidth: LF to 540MHz
• Propagation Delay: 0.8ns
• Maximum Gain: 27dB
• Gain Control Range: 22.5dB
• Gain Control Step: 1.5dB
• Gain Control Settling Time: 500ns
• Noise Figure: 8.6dB at 100MHz (Max Gain)
• Output Noise Floor: –138dBm/Hz (Max Gain)
• Reverse Isolation: –92dB
• Single Supply: 4.75V to 5.25V
• Shutdown Mode
• Enable/Disable Time: 1µs
• Differential I/O Interface
• 20-Lead TSSOP Package

Typical Application

Description

The LT5524 is a programmable gain amplifier (PGA) with bandwidth extending from low frequency (LF) to 540MHz. It consists of a digitally controlled variable attenuator, followed by a high linearity amplifier. 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 LT5524’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 LT5524 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.

Packaging

TSSOP-20

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LT5524EFE	TSSOP	20	E	$6.25	$4.40	View
LT5524EFE#PBF	TSSOP	20	E	$6.25	$4.40	View
LT5524EFE#TR	TSSOP	20	E		$4.50	View
LT5524EFE#TRPBF	TSSOP	20	E		$4.50	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
DC807A	LT5524EFE | IF AMP/ADC DRIVER	$150.00
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Applications

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

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.