LTC2271 16-Bit, 20Msps Serial Low Noise Dual ADC FEATURES DESCRIPTION n 2-Channel Simultaneous Sampling ADC The LTC 2271 is a 2-channel, simultaneous sampling n Serial LVDS Outputs: 1, 2 or 4 Bits per Channel 16-bit A/D converter designed for digitizing high frequency, n 84.1dB SNR (46V Input Referred Noise) wide dynamic range signals. It is perfect for demanding RMS n 99dB SFDR communications applications with AC performance that n Low Power: 185mW Total includes 84.1dB SNR and 99dB spurious free dynamic n 92mW per Channel range (SFDR). n Single 1.8V Supply DC specs include 1LSB INL (typ), 0.2LSB DNL (typ) n Selectable Input Ranges: 1V to 2.1V P-P P-P and no missing codes over temperature. The transition n 200MHz Full-Power Bandwidth S/H noise is 1.44LSB . RMS n Shutdown and Nap Modes n To minimize the number of data lines the digital outputs Serial SPI Port for Con guration n are serial LVDS. Each channel outputs one bit, two bits or Pin Compatible With four bits at a time. The LVDS drivers have optional internal LTC2190: 16-Bit, 25Msps, 104mW n termination and adjustable output levels to ensure clean 52-Lead (7mm 8mm) QFN Package signal integrity. APPLICATIONS + The ENC and ENC inputs may be driven differentially or n Low Power Instrumentation single ended with a sine wave, PECL, LVDS, TTL or CMOS n Software-De ned Radios inputs. An internal clock duty cycle stabilizer allows high n Portable Medical Imaging performance at full speed for a wide range of clock duty n Multi-Channel Data Acquisition cycles. 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. TYPICAL APPLICATION Integral Non-Linearity (INL) 1.8V 1.8V 2.0 V OV DD DD 1.5 OUT1A CH1 16-BIT S/H 1.0 ANALOG OUT1B ADC CORE INPUT OUT1C 0.5 OUT1D CH2 SERIALIZED 16-BIT OUT2A DATA 0.0 S/H ANALOG LVDS ADC CORE SERIALIZER OUT2B INPUT OUTPUTS 0.5 OUT2C OUT2D ENCODE 1.0 PLL DATA CLOCK OUT INPUT FRAME 1.5 GND OGND 2.0 0 32768 49152 65536 16384 2271 TA01 OUTPUT CODE 2271 TA02 2271f 1 INL ERROR (LSB)LTC2271 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltages V , OV ................................................ 0.3V to 2V DD DD Analog Input Voltage 52 51 50 49 48 47 46 45 44 43 42 41 A +, A , PAR/SER, SENSE IN IN + V 1 40 OUT1C CM1 (Note 3) ....................................0.3V to (V + 0.2V) DD GND 2 39 OUT1C Digital Input Voltage + A + 3 38 OUT1D IN1 + ENC , ENC , CS, SDI, SCK (Note 4) ...... 0.3V to 3.9V A 4 37 OUT1D IN1 + SDO (Note 4) ............................................ 0.3V to 3.9V GND 5 36 DCO Digital Output Voltage ................ 0.3V to (OV + 0.3V) REFH 6 35 DCO DD REFL 7 34 OV Operating Temperature Range 53 DD GND REFH 8 33 OGND LTC2271C ................................................ 0C to 70C + REFL 9 32 FR LTC2271I.............................................. 40C to 85C PAR/SER 10 31 FR Storage Temperature Range ................... 65C to 150C + A + 11 30 OUT2A IN2 A 12 29 OUT2A IN2 + GND 13 28 OUT2B V 14 27 OUT2B CM2 15 16 17 18 19 20 21 22 23 24 25 26 UKG PACKAGE 52-LEAD (7mm s 8mm) PLASTIC QFN T = 150C, = 29C/W JMAX JA EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2271CUKG PBF LTC2271CUKG TRPBF LTC2271UKG 52-Lead (7mm 8mm) Plastic QFN 0C to 70C LTC2271IUKG PBF LTC2271IUKG TRPBF LTC2271UKG 40C to 85C 52-Lead (7mm 8mm) Plastic QFN Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: