LTC2248/LTC2247/LTC2246 14-Bit, 65/40/25Msps Low Power 3V ADCs FEATURES DESCRIPTIO Sample Rate: 65Msps/40Msps/25Msps The LTC 2248/LTC2247/LTC2246 are 14-bit 65Msps/ Single 3V Supply (2.7V to 3.4V) 40Msps/25Msps, low power 3V A/D converters designed Low Power: 205mW/120mW/75mW for digitizing high frequency, wide dynamic range signals. 74.3dB SNR The LTC2248/LTC2247/LTC2246 are perfect for demand- 90dB SFDR ing imaging and communications applications with AC No Missing Codes performance that includes 74.3dB SNR and 90dB SFDR Flexible Input: 1V to 2V Range for signals at the Nyquist frequency. P-P P-P 575MHz Full Power Bandwidth S/H DC specs include 1LSB INL (typ), 0.5LSB DNL (typ) and Clock Duty Cycle Stabilizer no missing codes over temperature. The transition noise Shutdown and Nap Modes is a low 1LSB . RMS Pin Compatible Family A single 3V supply allows low power operation. A separate 125Msps: LTC2253 (12-Bit), LTC2255 (14-Bit) output supply allows the outputs to drive 0.5V to 3.6V 105Msps: LTC2252 (12-Bit), LTC2254 (14-Bit) logic. 80Msps: LTC2229 (12-Bit), LTC2249 (14-Bit) 65Msps: LTC2228 (12-Bit), LTC2248 (14-Bit) A single-ended CLK input controls converter operation. An 40Msps: LTC2227 (12-Bit), LTC2247 (14-Bit) optional clock duty cycle stabilizer allows high perfor- 25Msps: LTC2226 (12-Bit), LTC2246 (14-Bit) mance at full speed for a wide range of clock duty cycles. 10Msps: LTC2225 (12-Bit), LTC2245 (14-Bit) , LTC and LT are registered trademarks of Linear Technology Corporation. 32-Pin (5mm 5mm) QFN Package All other trademarks are the property of their respective owners. U APPLICATIO S Wireless and Wired Broadband Communication Imaging Systems Ultrasound Spectral Analysis Portable Instrumentation TYPICAL APPLICATIO LTC2248: SNR vs Input Frequency, 1dB, 2V Range, 65Msps REFH FLEXIBLE 75 REFERENCE REFL OV DD 74 D13 + 14-BIT CORRECTION ANALOG OUTPUT INPUT 73 PIPELINED INPUT LOGIC DRIVERS S/H ADC CORE D0 72 OGND 71 CLOCK/DUTY CYCLE CONTROL 70 0 50 100 150 200 2249 TA01a INPUT FREQUENCY (MHZ) 2249 TAO1b CLK 224876fa 1 SNR (dBFS) U ULTC2248/LTC2247/LTC2246 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO OV = V (Notes 1, 2) DD DD TOP VIEW Supply Voltage (V ) ................................................. 4V DD Digital Output Ground Voltage (OGND) ....... 0.3V to 1V 32 31 30 29 28 27 26 25 Analog Input Voltage (Note 3) ..... 0.3V to (V + 0.3V) DD + AIN 1 24 D10 Digital Input Voltage .................... 0.3V to (V + 0.3V) AIN 2 23 D9 DD REFH 3 22 D8 Digital Output Voltage ................ 0.3V to (OV + 0.3V) DD REFH 4 21 OV DD 33 Power Dissipation............................................ 1500mW REFL 5 20 OGND REFL 6 19 D7 Operating Temperature Range V 7 18 D6 DD LTC2248C, LTC2247C, LTC2246C........... 0C to 70C GND 8 17 D5 LTC2248I, LTC2247I, LTC2246I ..........40C to 85C 9 10 11 12 13 14 15 16 Storage Temperature Range ..................65C to 125C UH PACKAGE 32-LEAD (5mm 5mm) PLASTIC QFN T = 125C, = 34C/W JMAX JA EXPOSED PAD IS GND (PIN 33) MUST BE SOLDERED TO PCB ORDER PART NUMBER QFN PART MARKING* LTC2248CUH 2248 2248 LTC2248IUH LTC2247CUH 2247 2247 LTC2247IUH LTC2246CUH 2246 2246 LTC2246IUH Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: