Datasheet LT1993-10 (Analog Devices)

LT1993-10 700MHz Low Distortion, Low Noise Differential Amplifier/ ADC Driver (AV = 10V/V)
FEATURES DESCRIPTION
n 700MHz –3dB Bandwidth The LT®1993-10 is a low distortion, low noise Differential n Fixed Gain of 10V/V (20dB) Amplifier/ADC driver for use in applications from DC to n Low Distortion: 700MHz. The LT1993-10 has been designed for ease of 40dBm OIP3, –70dBc HD3 (70MHz 2V use, with minimal support circuitry required. Exceptionally P-P) 50.5dBm OIP3, –91dBc (10MHz 2V low input-referred noise and low distortion products P-P) n Low Noise: 12.7dB NF, e (with either single-ended or differential inputs) make the n = 1.9nV/√Hz n Differential Inputs and Outputs LT1993-10 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 LT1993-10 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 LT1993-10 is designed to meet the demanding Imaging requirements of communications transceiver applica- Communications tions. It can be used as a differential ADC driver, a gener- n Differential Driver/Receiver al-purpose differential gain block, or in any other appli- n Single Ended to Differential Conversion cation requiring differential drive. The LT1993-10 can be n Differential to Single Ended Conversion used in data acquisition systems required to function at n Level Shifting frequencies down to DC. n IF Sampling Receivers n SAW Filter Interfacing/Buffering The LT1993-10 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, LT1993-10 Driving LTC2255 4-Channel WCDMA Receive Channel 14-Bit ADC at 92.16Msps
0 –10 32768 POINT FFT TONE CENTER FREQUENCIES 1:1 –20 AT 62.5MHz, 67.5MHz, Z-RATIO 70MHz –30 72.5MHz, 77.5MHz –INB IF IN –OUT –40 • • –INA AIN– –OUTFILTERED –50 LT1993-10 82nH 52.3pF LTC2255 –60 ADC +OUTFILTERED –70 +INB AIN+ MA/COM +OUT AMPLITUDE (dBFS) –80 ETC 1-1-13 +INA VOCM LTC2255 125Msps –90 ENABLE 14-BIT ADC SAMPLING –100 AT 92.16Msps 2.2V 20dB Gain –110 199310 TA01 –120 0 5 10 15 20 25 30 35 40 45 FREQUENCY (MHz) 199310 TA02 Rev C 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