LT6402-20| Datasheet

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FEATURES

LT6402-20 300MHz Low Distortion, Low Noise Differential Amplifier/ ADC Driver (AV = 20dB) DESCRIPTIO
The LT 6402-20 is a low distortion, low noise differential amplifier/ADC driver for use in applications from DC to 300MHz. The LT6402-20 has been designed for ease of use, with minimal support circuitry required. Exceptionally low input-referred noise and low distortion (with either single-ended or differential inputs) make the LT6402-20 an excellent solution for driving high speed 12-bit and 14-bit ADCs. In addition to the normal unfiltered outputs (+OUT and OUT), the LT6402-20 has a built-in 75MHz differential low pass filter and an additional pair of filtered outputs (+OUTFILTERED, OUTFILTERED) to reduce external filtering components when driving high speed ADCs. The output common mode voltage is easily set via the VOCM pin, eliminating an output transformer or ACcoupling capacitors in many applications. The LT6402-20 is designed to meet the demanding requirements of communications transceiver applications. It can be used as a differential ADC driver, a general-purpose differential gain block, or in oth
er applications requiring differential drive. The LT6402-20 can be used in data acquisition systems required to function at frequencies down to DC. The LT6402-20 operates on a 5V supply and consumes 30mA. It comes in a compact 16-lead 3mm 3mm QFN package and operates over a 40 C to 85 C temperature range.

300 MHz 3dB Bandwidth Fixed Gain of 20dB Low Distortion: 51dBm OIP3, 81dBc HD3 (20MHz, 2VP-P) Low Noise: 12.4dB NF, en = 1.9nV/Hz (20MHz) Differential Inputs and Outputs Additional Filtered Outputs Adjustable Output Common Mode Voltage DC- or AC-Coupled Operation Minimal Support Circuitry Required Small 0.75mm Profile 16-Lead 3mm 3mm QFN Package

APPLICATIO S

Differential ADC Driver for: Imaging Communications Differential Driver/Receiver Single Ended to Differential Conversion Differential to Single Ended Conversion Level Shifting IF Sampling Receivers SAW Filter Interfacing/Buffering

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO
5V 0.1uF

Distortion vs Frequency, Differential Input, No RLOAD
40 50 DISTORTION (dBc) 60 70 80 90 100
6402 TA01a

0.1uF INB INA 0.1uF 0.1uF IF IN +INB +INA VEE VCC VOCM +OUT LT6402-20 OUT 10 10 AIN+ LTC 2249 AIN VCM

1

U

U

U

FILTERED OUTPUTS VOUT = 2VP-P

HD3

HD2 10 FREQUENCY (MHz) 100
64022 G08

640220fa

1

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LT6402-20 DATASHEET