LTC2157-12/ LTC2156-12/LTC2155-12 Dual 12-Bit 250Msps/ 210Msps/170Msps ADCs FEATURES DESCRIPTION n 68.5dB SNR The LTC 2157-12/LTC2156-12/LTC2155-12 are a family of n 90dB SFDR dual 250Msps/210Msps/170Msps 12-bit A/D converters n Low Power: 628mW/592mW/545mW Total designed for digitizing high frequency, wide dynamic range n Single 1.8V Supply signals. They are perfect for demanding communications n DDR LVDS Outputs applications with AC performance that includes 68.5dB n Easy-to-Drive 1.5V Input Range SNR and 90dB spurious free dynamic range (SFDR). The P-P n 1.25GHz Full-Power Bandwidth S/H 1.25GHz input bandwidth allows the ADC to achieve high n Optional Clock Duty Cycle Stabilizer undersampling ratio with very low attenuation. The latency n Low Power Sleep and Nap Modes is only five clock cycles. n Serial SPI Port for Configuration DC specs include 0.26LSB INL (typ), 0.16LSB DNL (typ) n Pin Compatible 14-Bit Versions and no missing codes over temperature. The transition n 64-Lead (9mm 9mm) QFN Package noise is 0.54LSB . RMS APPLICATIONS The digital outputs are double data rate (DDR) LVDS. + n Communications The ENC and ENC inputs can be driven differentially with n Cellular Basestations a sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional n Software Defined Radios clock duty cycle stabilizer allows high performance at full n Medical Imaging speed for a wide range of clock duty cycles. n High Definition Video L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Testing and Measurement Instruments TYPICAL APPLICATION V DD LTC2157-12: 32K Points 2-Tone FFT, OV DD f = 71MHZ and 69MHz, 250Msps CHANNEL A IN DA10 11 0 12-BIT CORRECTION DDR ANALOG OUTPUT S/H PIPELINED LOGIC LVDS INPUT DRIVERS ADC CORE 20 DA0 1 40 OGND CLOCK/DUTY CYCLE 60 CLOCK OV CONTROL DD CHANNEL B 80 DB10 11 100 12-BIT CORRECTION ANALOG OUTPUT DDR S/H PIPELINED LOGIC INPUT DRIVERS LVDS ADC CORE 120 DB0 1 0 40 60 80 100 120 20 FREQUENCY (MHz) GND 21576512 G11 21576512 TA01 OGND 21576512f 1 AMPLITUDE (dBFS)LTC2157-12/ LTC2156-12/LTC2155-12 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltage V , OV ................................................ 0.3V to 2V DD DD Analog Input Voltage + A , A , PAR/SER, INA/B INA/B SENSE (Note 3) ........................ 0.3V to (V + 0.2V) DD V 1 48 OGND DD + V 2 47 DA2 3 DD Digital Input Voltage GND 3 46 DA2 3 + + + ENC , ENC (Note 3) ................ 0.3V to (V + 0.3V) A 4 45 DA0 1 DD INA A 5 44 DA0 1 INA CS, SDI, SCK (Note 4) ........................... 0.3V to 3.9V GND 6 43 NC SDO (Note 4) ............................................. 0.3V to 3.9V SENSE 7 42 NC + V 8 41 CLKOUT 65 REF Digital Output Voltage ................ 0.3V to (OV + 0.3V) DD GND 9 GND 40 CLKOUT + V 10 39 DB10 11 Operating Temperature Range CM GND 11 38 DB10 11 LTC2157C, LTC2156C, LTC2155C ............ 0C to 70C + A 12 37 DB8 9 INB + A 13 36 DB8 9 LTC2157I, LTC2156I, LTC2155I ............40C to 85C INB + GND 14 35 DB6 7 Storage Temperature Range .................. 65C to 150C V 15 34 DB6 7 DD V 16 33 OGND DD UP PACKAGE 64-LEAD (9mm 9mm) PLASTIC QFN T = 150C, = 20C/W JMAX JA EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2157CUP-12 PBF LTC2157CUP-12 TRPBF LTC2157UP-12 64-Lead (9mm 9mm) Plastic QFN 0C to 70C LTC2157IUP-12 PBF LTC2157IUP-12 TRPBF LTC2157UP-12 40C to 85C 64-Lead (9mm 9mm) Plastic QFN LTC2156CUP-12 PBF LTC2156CUP-12 TRPBF LTC2156UP-12 0C to 70C 64-Lead (9mm 9mm) Plastic QFN LTC2156IUP-12 PBF LTC2156IUP-12 TRPBF LTC2156UP-12 64-Lead (9mm 9mm) Plastic QFN 40C to 85C LTC2155CUP-12 PBF LTC2155CUP-12 TRPBF LTC2155UP-12 64-Lead (9mm 9mm) Plastic QFN 0C to 70C LTC2155IUP-12 PBF LTC2155IUP-12 TRPBF LTC2155UP-12 64-Lead (9mm 9mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: