Datasheet LT1993-4 (Analog Devices)

LT1993-4 900MHz Low Distortion, Low Noise Differential Amplifier/ ADC Driver (AV = 4V/V) FEATURES DESCRIPTION n 900MHz –3dB Bandwidth The LT®1993-4 is a low distortion, low noise Differential n Fixed Gain of 4V/V (12dB) Amplifier/ADC driver for use in applications from DC to n Low Distortion: 900MHz. The LT1993-4 has been designed for ease of 40dBm OIP3, –73dBc HD3 (70MHz 2VP-P) use, with minimal support circuitry required. Exceptionally 51dBm OIP3, –94dBc HD3 (10MHz 2VP-P) low input-referred noise and low distortion products n Low Noise: 14.5dB NF, en = 2.35nV/√Hz (70MHz) (with either single-ended or differential inputs) make the n Differential Inputs and Outputs LT1993-4 an excellent solution for driving high speed n Additional Filtered Outputs 12-bit and 14-bit ADCs. In addition to the normal unfiltered n Adjustable Output Common Mode Voltage outputs (+OUT and –OUT), the LT1993-4 has a built-in n DC- or AC-Coupled Operation 175MHz differential lowpass filter and an additional pair n Minimal Support Circuitry Required of filtered outputs (+OUTFILTERED, –OUTFILTERED) to n Small 0.75mm Tall 16-Lead 3 × 3 QFN Package reduce external filtering components when driving high speed ADCs. The output common mode voltage is easily APPLICATIONS set via the VOCM pin, eliminating either an output trans- former or AC-coupling capacitors in many applications. n Differential ADC Driver for: The LT1993-4 is designed to meet the demanding require- Imaging ments of communications transceiver applications. It can Communications n be used as a differential ADC driver, a general-purpose Differential Driver/Receiver n differential gain block, or in any other application requir- Single Ended to Differential Conversion n ing differential drive. The LT1993-4 can be used in data Differential to Single Ended Conversion n acquisition systems required to function at frequencies Level Shifting n down to DC. IF Sampling Receivers n SAW Filter Interfacing/Buffering The LT1993-4 operates on a 5V supply and consumes All registered trademarks and trademarks are the property of their respective owners. 100mA. It comes in a compact 16-lead 3 × 3 QFN package and operates over a –40°C to 85°C temperature range. TYPICAL APPLICATION
4-Tone WCDMA Waveform, LT1993-4 Driving LTC2255 ADC Driver with Single-Ended to Differential Conversion 14-Bit ADC at 92.16Msps
0 1:1 0.1 F –10 32768 POINT FFT TONE CENTER FREQUENCIES Z-RATIO 70MHz –20 AT 62.5MHz, 67.5MHz, –INB IF IN 12.2 –OUT –30 72.5MHz, 77.5MHz • • –INA AIN– –OUTFILTERED –40 100 LT1993-4 82nH 52.3pF LTC2255 –50 ADC +OUTFILTERED –60 +INB AIN+ –70 MA/COM +OUT 12.2 ETC1-1-13 0.1 F +INA VOCM –80 LTC2255 125Msps AMPLITUDE (dBFS) ENABLE 14-BIT ADC SAMPLING –90 AT 92.16Msps 2.2V 12dB GAIN –100 –110 19934 TA01 –120 0 5 10 15 20 25 30 35 40 45 FREQUENCY (MHz) LT19934 TA02 Rev B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information DC Electrical Characteristics AC Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Application Package Description Revision History Typical Application Related Parts