300MHz Low Distortion, Low Noise Differential Amplifier/ADC Driver (A = 20dB)

The LT6402-20 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 AC-coupling 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 other 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 –40ºC to 85ºC temperature range.

Applications

* 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

* 300 MHz –3dB Bandwidth

* Fixed Gain of 20dB

* Low Distortion:

* 48.5dBm 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