LTC6421-20 - Dual Matched 1.3GHz Differential Amplifiers/ADC Drivers

Features

• Click Here For LTC6421-20 Evaluation Kits
• Matched Gain ±0.1dB
• Matched Phase ±0.2° at 100MHz
• Channel Separation 80dB at 100MHz
• 1.3GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)
• IMD₃ = –76dBc at 100MHz, 2V_P-P
• Equivalent OIP₃ = 42dBm at 100MHz
• 1nV/√Hz Internal Op Amp Noise
• 6.2dB Noise Figure
• Differential Inputs and Outputs
• Rail-to-Rail Output Swing
• 40mA Supply Current (120mW) per Amplifier
• 1V to 1.6V Output Common Mode Voltage, Adjustable
• DC- or AC-Coupled Operation
• 20-Lead 3mm x 4mm x 0.75mm QFN Package

Typical Application

Description

The LTC6421-20 is a dual high speed differential amplifier targeted at processing signals from DC to 140MHz. The part has been specifically designed to drive 12-, 14- and 16-bit ADCs with low noise and low distortion, but can also be used as a general-purpose broadband gain block.

The LTC6421-20 is easy to use, with minimal support circuitry required. The output common mode voltage is set using an external pin, independent of the inputs, which eliminates the need for transformers or AC-coupling capacitors in many applications. The gain is internally fixed at 20dB (10V/V).

The LTC6421-20 saves space and power compared to alternative solutions using IF gain blocks and transformers. The LTC6421-20 is packaged in a compact 20-lead 3mm × 4mm QFN package and operates over the –40°C to 85°C temperature range.

Packaging

QFN-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
LTC6421CUDC-20#PBF	QFN	20	C	$6.88	$4.77	View
LTC6421CUDC-20#TR	QFN	20	C		$4.82	View
LTC6421CUDC-20#TRPBF	QFN	20	C		$4.82	View
LTC6421IUDC-20	QFN	20	I	$7.92	$5.49	View
LTC6421IUDC-20#PBF	QFN	20	I	$7.92	$5.49	View
LTC6421IUDC-20#TR	QFN	20	I		$5.54	View
LTC6421IUDC-20#TRPBF	QFN	20	I		$5.54	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
DC1299A-B	LTC6421CUD-20 | Dual Matched 1.3GHz Differential Amplifiers/ADC Drivers	$125.00
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Applications

• Differential ADC Driver
• Differential Driver/Receiver
• Single Ended to Differential Conversion
• IF Sampling (Diversity) Receivers

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.