LT1993-4 Datasheet

• 900MHz −3dB Bandwidth
• Fixed Gain of 4V/V (12dB)
• Low Distortion:
  • 40dBm OIP3, −73dBc HD3 (70MHz 2V_P-P)
  • 51dBm OIP3, −94dBc HD3 (10MHz 2V_P-P)
• Low Noise: 14.5dB NF, e_n = 2.35nV/√Hz (70MHz)
• Differential Inputs and Outputs
• Additional Filtered Outputs
• Adjustable Output Common Mode Voltage
• DC- or AC-Coupled Operation
• Minimal Support Circuitry Required
• Small 0.75mm Tall 16-Lead 3 × 3 QFN Package

• 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

The LT1993-4 is a low distortion, low noise Differential Amplifier/ADC driver for use in applications from DC to 900MHz. The LT1993-4 has been designed for ease of  use, with minimal support circuitry required. Exceptionally low input-referred noise and low distortion products (with either single-ended or differential inputs) make the LT1993-4 an excellent solution for driving high speed 12-bit and 14-bit ADCs. In addition to the normal unfiltered outputs (+OUT and -OUT), the LT1993-4 has a built-in 175MHz differential lowpass 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 V_OCM pin, eliminating either an output transformer or AC-coupling capacitors in many applications.

The LT1993-4 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 any other application requiring differential drive. The LT1993-4 can be used in data acquisition systems required to function at frequencies down to DC.

The LT1993-4 operates on a 5V supply and consumes 100mA. It comes in a compact 16-lead 3 × 3 QFN package and operates over a -40°C to 85°C temperature range.