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LT1993-2 Dataheets PDF



Part Number LT1993-2
Manufacturers Linear Technology
Logo Linear Technology
Description 800MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver
Datasheet LT1993-2 DatasheetLT1993-2 Datasheet (PDF)

FEATURES ■ ■ ■ LT1993-2 800MHz Low Distortion, Low Noise Differential Amplifier/ ADC Driver (AV = 2V /V) DESCRIPTIO www.DataSheet4U.com ■ ■ ■ ■ ■ ■ ■ 800MHz –3dB Bandwidth Fixed Gain of 2V/V (6dB) Low Distortion: 38dBm OIP3, –70dBc HD3 (70MHz, 2VP-P) 51dBm OIP3, –94dBc HD3 (10MHz, 2VP-P) Low Noise: 12.3dB NF, en = 3.8nV/√Hz (70MHz) Differential Inputs and Outputs Additional Filtered Outputs Adjustable Output Common Mode Voltage DC- or AC-Coupled Operation Minimal Support Circuitry Required Sma.

  LT1993-2   LT1993-2


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FEATURES ■ ■ ■ LT1993-2 800MHz Low Distortion, Low Noise Differential Amplifier/ ADC Driver (AV = 2V /V) DESCRIPTIO www.DataSheet4U.com ■ ■ ■ ■ ■ ■ ■ 800MHz –3dB Bandwidth Fixed Gain of 2V/V (6dB) Low Distortion: 38dBm OIP3, –70dBc HD3 (70MHz, 2VP-P) 51dBm OIP3, –94dBc HD3 (10MHz, 2VP-P) Low Noise: 12.3dB NF, en = 3.8nV/√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 U APPLICATIO S ■ The LT®1993-2 is a low distortion, low noise Differential Amplifier/ADC driver for use in applications from DC to 800MHz. The LT1993-2 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 LT1993-2 an excellent solution for driving high speed 12bit and 14-bit ADCs. In addition to the normal unfiltered outputs (+OUT and –OUT), the LT1993-2 has a built-in 175MHz 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 either an output transformer or AC-coupling capacitors in many applications. The LT1993-2 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 LT1993-2 can be used in data acquisition systems required to function at frequencies down to DC. The LT1993-2 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. 4-Tone WCDMA Waveform, LT1993-2 Driving LTC2255 14-Bit ADC at 92.16Msps 0 32768 POINT FFT –10 TONE CENTER FREQUENCIES –20 AT 62.5MHz, 67.5MHz, 72.5MHz, 77.5MHz –30 AMPLITUDE (dBFS) –40 –50 –60 –70 –80 –90 –100 –110 –120 0 5 10 15 20 25 30 35 FREQUENCY (MHz) 40 45 ■ ■ ■ ■ ■ ■ 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 , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO 1:4 Z-RATIO 0.1µF –INB –INA 0.1µF MINI-CIRCUITS TCM4-19 4-Channel WCDMA Receive Channel 70MHz IF IN –OUT 82nH 12.2Ω AIN– LTC2255 ADC AIN+ –OUTFILTERED LT1993-2 +OUTFILTERED +INB +OUT +INA VOCM ENABLE 2.2V 52.3pF 12.2Ω LTC2255 125Msps 14-BIT ADC SAMPLING AT 92.16Msps 19932 TA01a U U • • 19932 TA01b 19932fa 1 LT1993-2 ABSOLUTE (Note 1) www.DataSheet4U.com AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO TOP VIEW +INA +INB –INA –INB 12 VEEC 17 11 ENABLE 10 VCCB 9 5 +OUT 6 +OUTFILTERED 7 –OUTFILTERED 8 –OUT VEEB 16 15 14 13 VCCC 1 VOCM 2 VCCA 3 VEEA 4 Total Supply Voltage (VCCA/VCCB/VCCC to VEEA/VEEB/VEEC) ...................................................5.5V Input Current (+INA, –INA, +INB, –INB, VOCM, ENABLE)................................................±10mA Output Current (Continuous) (Note 6) +OUT, –OUT (DC) ..........................................±100mA (AC) ..........................................±100mA +OUTFILTERED, –OUTFILTERED (DC) .............±15mA (AC) .............±45mA Output Short Circuit Duration (Note 2) ............ Indefinite Operating Temperature Range (Note 3) ... –40°C to 85°C Specified Temperature Range (Note 4) .... –40°C to 85°C Storage Temperature Range................... –65°C to 125°C Junction Temperature ........................................... 125°C Lead Temperature Range (Soldering 10 sec) ........ 300°C DC ELECTRICAL CHARACTERISTICS SYMBOL GDIFF VSWINGMIN VSWINGMAX VSWINGDIFF Output Voltage Swing IOUT VOS TCVOS IVRMIN IVRMAX RINDIFF CINDIFF CMRR Output Current Drive Input Offset Voltage PARAMETER Gain CONDITIONS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCCA = VCCB = VCCC = 5V, VEEA = VEEB = VEEC = 0V, ENABLE = 0.8V, +INA shorted to +INB (+IN), –INA shorted to –INB (–IN), VOCM = 2.2V, Input common mode voltage = 2.2V, no RLOAD unless otherwise noted. MIN ● ● ● ● ● ● Input/Output Characteristics (+INA, +INB, –INA, –INB, +OUT, –OUT, +OUTFILTERED, –OUTFILTERED) Differential (+OUT, –OUT), VIN = ±0.8V Differential Single-Ended +OUT, –OUT, +OUTFILTERED, –OUTFILTERED. VIN = ±2.2V Differential Single-Ended +OUT, –OUT, +OUTFILTERED, –OUTFILTERED. VIN = ±2.2V Differential Differential (+OUT, –OUT), VIN = ±2.2V Differential (Note 5) 5.8 6.08 0.25 3.6 3.5 6.5 6 ±40 –6.5 –10 3.75 7 ±45 1 2.5 –0.1 5.1 170 45 200 1 Input Common Mode –0.1V to 5.1V ● Input Offset V.


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