LT1993-10 700MHz Low Distortion, Low Noise Differential Ampli er/ ADC Driver (A = 10V/V) V DESCRIPTIO FEATURES 700MHz 3dB Bandwidth The LT 1993-10 is a low distortion, low noise Differential Fixed Gain of 10V/V (20dB) Ampli er/ADC driver for use in applications from DC to Low Distortion: 700MHz. The LT1993-10 has been designed for ease of 40dBm OIP3, 70dBc HD3 (70MHz 2V ) use, with minimal support circuitry required. Exception- P-P 50.5dBm OIP3, 91dBc (10MHz 2V ) ally low input-referred noise and low distortion products P-P Low Noise: 12.7dB NF, e = 1.9nV/Hz (with either single-ended or differential inputs) make the n Differential Inputs and Outputs LT1993-10 an excellent solution for driving high speed Additional Filtered Outputs 12-bit and 14-bit ADCs. In addition to the normal un ltered Adjustable Output Common Mode Voltage outputs (+OUT and OUT), the LT1993-10 has a built-in DC- or AC-Coupled Operation 175MHz differential lowpass lter and an additional pair Minimal Support Circuitry Required of ltered outputs (+OUTFILTERED, OUTFILTERED) to Small 0.75mm Tall 16-Lead 3 3 QFN Package reduce external ltering components when driving high speed ADCs. The output common mode voltage is easily set U APPLICATIO S via the V pin, eliminating either an output transformer OCM or AC-coupling capacitors in many applications. Differential ADC Driver for: The LT1993-10 is designed to meet the demanding require- Imaging ments of communications transceiver applications. It can Communications be used as a differential ADC driver, a general-purpose Differential Driver/Receiver differential gain block, or in any other application requir- Single Ended to Differential Conversion ing differential drive. The LT1993-10 can be used in data Differential to Single Ended Conversion acquisition systems required to function at frequencies Level Shifting down to DC. IF Sampling Receivers SAW Filter Interfacing/Buffering The LT1993-10 operates on a 5V supply and consumes , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. 100mA. It comes in a compact 16-lead 3 3 QFN package All other trademarks are the property of their respective owners. and operates over a 40C to 85C temperature range. 4-Tone WCDMA Waveform, TYPICAL APPLICATIO LT1993-10 Driving LTC2255 14-Bit ADC at 92.16Msps 4-Channel WCDMA Receive Channel 0 32768 POINT FFT 10 TONE CENTER FREQUENCIES 20 AT 62.5MHz, 67.5MHz, 1:1 72.5MHz, 77.5MHz 30 Z-RATIO 70MHz INB 40 IF IN OUT AIN 50 INA OUTFILTERED 60 LTC2255 LT1993-10 82nH 52.3pF ADC 70 +OUTFILTERED 80 +INB AIN+ +OUT MA/COM 90 +INA V OCM ETC 1-1-13 LTC2255 125Msps 100 ENABLE 14-BIT ADC SAMPLING 110 AT 92.16Msps 2.2V 20dB Gain 120 199310 TA01 0 5 10 15 20 25 30 35 40 45 FREQUENCY (MHz) 199310 TA02 199310fb 1 AMPLITUDE (dBFS) U ULT1993-10 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Total Supply Voltage (V /V /V to CCA CCB CCC V /V /V ) ...................................................5.5V EEA EEB EEC 16 15 14 13 Input Current (+INA, INA, +INB, INB, V 1 12 V CCC EEC V , ENABLE) ................................................10mA OCM V 2 11 ENABLE OCM 17 Output Current (Continuous) (Note 6) V 3 10 V CCA CCB +OUT, OUT (DC) ..........................................100mA V 4 9 V EEA EEB 5 6 7 8 (AC) ..........................................100mA +OUTFILTERED, OUTFILTERED (DC) .............15mA (AC) .............45mA Output Short Circuit Duration (Note 2) ............ Inde nite Operating Temperature Range (Note 3) ... 40C to 85C UD PACKAGE 16-LEAD (3mm 3mm) PLASTIC QFN Speci ed Temperature Range (Note 4) .... 40C to 85C T = 125C, = 68C/W, = 4.2C/W JMAX JA JC Storage Temperature Range ................... 65C to 125C EXPOSED PAD IS V (PIN 17) EE MUST BE SOLDERED TO THE PCB Junction Temperature ........................................... 125C ORDER PART NUMBER UD PART MARKING* Lead Temperature Range (Soldering 10 sec) ........ 300C LT1993CUD-10 LBNT LT1993IUD-10 LBNT Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: