LTC2142-14/ LTC2141-14/LTC2140-14 14-Bit, 65Msps/ 40Msps/25Msps Low Power Dual ADCs FEATURES DESCRIPTION n Two-Channel Simultaneously Sampling ADC The LTC 2142-14/LTC2141-14/LTC2140-14 are 2-channel n 73.2dB SNR simultaneous sampling 14-bit A/D converters designed n 90dB SFDR for digitizing high frequency, wide dynamic range signals. n Low Power: 95mW/67mW/50mW Total They are perfect for demanding communications applica- 48mW/34mW/25mW per Channel tions with AC performance that includes 73.2dB SNR and n Single 1.8V Supply 90dB spurious free dynamic range (SFDR). Ultralow jitter n CMOS, DDR CMOS, or DDR LVDS Outputs of 0.08ps allows undersampling of IF frequencies with RMS n Selectable Input Ranges: 1V to 2V excellent noise performance. P-P P-P n 750MHz Full Power Bandwidth S/H DC specs include 1LSB INL (typ), 0.3LSB DNL (typ) n Optional Data Output Randomizer and no missing codes over temperature. The transition n Optional Clock Duty Cycle Stabilizer noise is 1.2LSB . RMS n Shutdown and Nap Modes n The digital outputs can be either full rate CMOS, double Serial SPI Port for Configuration n data rate CMOS, or double data rate LVDS. A separate 64-Pin (9mm 9mm) QFN Package output power supply allows the CMOS output swing to range from 1.2V to 1.8V. APPLICATIONS + The ENC and ENC inputs may be driven differentially n Communications or single-ended with a sine wave, PECL, LVDS, TTL, or n Cellular Base Stations CMOS inputs. An optional clock duty cycle stabilizer al- n Software Defined Radios lows high performance at full speed for a wide range of n Portable Medical Imaging clock duty cycles. n Multi-Channel Data Acquisition L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Nondestructive Testing Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 2-Tone FFT, f = 70MHz and 69MHz 1.8V 1.8V IN V OV DD DD 0 10 20 CH 1 14-BIT D1 13 ANALOG S/H 30 ADC CORE t INPUT t 40 CMOS, t DDR CMOS, D1 0 50 OR 60 D2 13 DDR LVDS t OUTPUTS 70 OUTPUT t CH 2 DRIVERS 14-BIT t 80 ANALOG S/H D2 0 ADC CORE INPUT 90 100 110 120 65MHz CLOCK 0 10 15 20 25 30 5 CLOCK CONTROL FREQUENCY (MHz) 21421014 TA01b 21421014 TA01a GND OGND 21421014fa 1 AMPLITUDE (dBFS)LTC2142-14/ LTC2141-14/LTC2140-14 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages (V , OV ) ....................... 0.3V to 2V Digital Output Voltage ................ 0.3V to (OV + 0.3V) DD DD DD + Analog Input Voltage (A , A , Operating Temperature Range IN IN PAR/SER, SENSE) (Note 3) .......... 0.3V to (V + 0.2V) LTC2142C, LTC2141C, LTC2140C ............. 0C to 70C DD + Digital Input Voltage (ENC , ENC , CS, LTC2142I, LTC2141I, LTC2140I ............40C to 85C SDI, SCK) (Note 4) .................................... 0.3V to 3.9V Storage Temperature Range .................. 65C to 150C SDO (Note 4) ............................................. 0.3V to 3.9V PIN CONFIGURATIONS FULL RATE CMOS OUTPUT MODE DOUBLE DATA RATE CMOS OUTPUT MODE TOP VIEW TOP VIEW V 1 48 D1 3 V 1 48 D1 2 3 DD DD V 2 47 D1 2 V 2 47 DNC CM1 CM1 GND 3 46 D1 1 GND 3 46 D1 0 1 + + A 4 45 D1 0 A 4 45 DNC IN1 IN1 A 5 44 DNC A 5 44 DNC IN1 IN1 GND 6 43 DNC GND 6 43 DNC REFH 7 42 OV REFH 7 42 OV DD DD REFL 8 65 41 OGND REFL 8 65 41 OGND + + GND REFH 9 40 CLKOUT GND REFH 9 40 CLKOUT REFL 10 39 CLKOUT REFL 10 39 CLKOUT PAR/SER 11 38 D2 13 PAR/SER 11 38 D2 12 13 + + A 12 37 D2 12 A 12 37 DNC IN2 IN2 A 13 36 D2 11 A 13 36 D2 10 11 IN2 IN2 GND 14 35 D2 10 GND 14 35 DNC V 15 34 D2 9 V 15 34 D2 8 9 CM2 CM2 V 16 33 D2 8 V 16 33 DNC DD DD UP PACKAGE UP PACKAGE 64-LEAD (9mm s 9mm) PLASTIC QFN 64-LEAD (9mm s 9mm) PLASTIC QFN T = 150C, = 20C/W T = 150C, = 20C/W JMAX JA JMAX JA EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB 21421014fa 2 64 V V 17 DD DD + 63 SENSE ENC 18 62 V ENC 19 REF 61 SDO CS 20 60 OF1 SCK 21 59 OF2 SDI 22 58 D1 13 DNC 23 57 D1 12 DNC 24 56 D1 11 D2 0 25 55 D1 10 D2 1 26 54 D1 9 D2 2 27 53 D1 8 D2 3 28 52 D1 7 D2 4 29 51 D1 6 D2 5 30 50 D1 5 D2 6 31 49 D1 4 D2 7 32 64 V V 17 DD DD + 63 SENSE ENC 18 62 V ENC 19 REF 61 SDO CS 20 60 OF2 1 SCK 21 59 DNC SDI 22 58 D1 12 13 DNC 23 57 DNC DNC 24 56 D1 10 11 DNC 25 55 DNC D2 0 1 26 54 D1 8 9 DNC 27 53 DNC D2 2 3 28 52 D1 6 7 DNC 29 51 DNC D2 4 5 30 50 D1 4 5 DNC 31 49 DNC D2 6 7 32