LTC2238/LTC2237/LTC2236 10-Bit, 65/40/25Msps Low Noise 3V ADCs FEATURES DESCRIPTIO Sample Rate: 65Msps/40Msps/25Msps The LTC 2238/LTC2237/LTC2236 are 10-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. 61.8dB SNR The LTC2238/LTC2237/LTC2236 are perfect for demand- 85dB SFDR ing imaging and communications applications with AC No Missing Codes performance that includes 61.8dB SNR and 85dB 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 0.1LSB INL (typ), 0.05LSB DNL (typ) Clock Duty Cycle Stabilizer and 0.5LSB INL, 0.5LSB DNL over temperature. The Shutdown and Nap Modes transition noise is a low 0.07LSB . RMS Pin Compatible Family: A single 3V supply allows low power operation. A separate 125Msps: LTC2251 (10-Bit), LTC2253 (12-Bit) output supply allows the outputs to drive 0.5V to 3.6V 105Msps: LTC2250 (10-Bit), LTC2252 (12-Bit) logic. 80Msps: LTC2239 (10-Bit), LTC2229 (12-Bit) 65Msps: LTC2238 (10-Bit), LTC2228 (12-Bit) A single-ended CLK input controls converter operation. An 40Msps: LTC2237 (10-Bit), LTC2227 (12-Bit) optional clock duty cycle stabilizer allows high perfor- 25Msps: LTC2236 (10-Bit), LTC2226 (12-Bit) mance at full speed for a wide range of clock duty cycles. 32-Pin (5mm 5mm) QFN Package , LTC and LT are registered trademarks of Linear Technology Corporation. U All other trademarks are the property of their respective owners. APPLICATIO S Wireless and Wired Broadband Communication Imaging Systems Ultrasound Spectral Analysis Portable Instrumentation TYPICAL APPLICATIO LTC2238: SNR vs Input Frequency, 1dB, 2V Range, 65Msps REFH FLEXIBLE 62.5 REFERENCE REFL OV DD 61.5 D9 + 10-BIT CORRECTION 60.5 ANALOG OUTPUT INPUT PIPELINED LOGIC INPUT DRIVERS S/H ADC CORE D0 59.5 OGND 58.5 CLOCK/DUTY CYCLE CONTROL 57.5 0 50 100 150 200 223876 TA01 INPUT FREQUENCY (MHz) CLK 223876 G09 223876fa 1 SNR (dBFS) U ULTC2238/LTC2237/LTC2236 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) AIN 1 24 D6 DD AIN 2 23 D5 Digital Input Voltage .................... 0.3V to (V + 0.3V) DD REFH 3 22 D4 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 D3 Operating Temperature Range V 7 18 D2 DD LTC2238C, LTC2237C, LTC2236C........... 0C to 70C GND 8 17 D1 LTC2238I, LTC2237I, LTC2236I ..........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 (PIN 33) IS GND MUST BE SOLDERED TO PCB ORDER PART NUMBER QFN PART MARKING* 2238 LTC2238CUH 2238 LTC2238IUH 2237 LTC2237CUH 2237 LTC2237IUH LTC2236CUH 2236 2236 LTC2236IUH Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: