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LTC2257-12 Dataheets PDF



Part Number LTC2257-12
Manufacturers Linear Technology
Logo Linear Technology
Description Ultralow Power 1.8V ADCs
Datasheet LTC2257-12 DatasheetLTC2257-12 Datasheet (PDF)

Features n 71.1dB SNR n 88dB SFDR n Low Power: 79mW/47mW/34mW n Single 1.8V Supply n CMOS, DDR CMOS or DDR LVDS Outputs n Selectable Input Ranges: 1VP-P to 2VP-P n 800MHz Full-Power Bandwidth S/H n Optional Data Output Randomizer n Optional Clock Duty Cycle Stabilizer n Shutdown and Nap Modes n Serial SPI Port for Configuration n Pin Compatible 14-Bit and 12-Bit Versions n 40-Pin (6mm × 6mm) QFN Package Applications n Communications n Cellular Base Stations n Software Defined Radios n Portable M.

  LTC2257-12   LTC2257-12


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Features n 71.1dB SNR n 88dB SFDR n Low Power: 79mW/47mW/34mW n Single 1.8V Supply n CMOS, DDR CMOS or DDR LVDS Outputs n Selectable Input Ranges: 1VP-P to 2VP-P n 800MHz Full-Power Bandwidth S/H n Optional Data Output Randomizer n Optional Clock Duty Cycle Stabilizer n Shutdown and Nap Modes n Serial SPI Port for Configuration n Pin Compatible 14-Bit and 12-Bit Versions n 40-Pin (6mm × 6mm) QFN Package Applications n Communications n Cellular Base Stations n Software Defined Radios n Portable Medical Imaging n Multi-Channel Data Acquisition n Nondestructive Testing LTC2258-12 LTC2257-12/LTC2256-12 12-Bit, 65/40/25Msps Ultralow Power 1.8V ADCs Description The LTC®2258-12/LTC2257-12/LTC2256-12 are sampling 12-bit A/D converters designed for digitizing high frequency, wide dynamic range signals. They are perfect for demanding communications applications with AC performance that includes 71.1dB SNR and 88dB spurious free dynamic range (SFDR). Ultralow jitter of 0.17psRMS allows undersampling of IF frequencies with excellent noise performance. DC specs include ±0.3LSB INL (typical), ±0.1LSB DNL (typical) and no missing codes over temperature. The transition noise is a low 0.3LSBRMS. The digital outputs can be either full rate CMOS, double data rate CMOS, or double data rate LVDS. A separate output power supply allows the CMOS output swing to range from 1.2V to 1.8V. The ENC+ and ENC– inputs may be driven differentially or single-ended with a sine wave, PECL, LVDS, TTL or CMOS inputs. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty 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 1.8V VDD ANALOG INPUT + INPUT S/H – 12-BIT PIPELINED ADC CORE CORRECTION LOGIC CLOCK/DUTY CYCLE CONTROL 65MHz GND CLOCK OUTPUT DRIVERS 1.2V TO 1.8V OVDD D11 • CMOS • OR • LVDS D0 OGND 225812 TA01a For more information www.linear.com/LTC2258-12 AMPLITUDE (dBFS) LTC2258-12 2-Tone FFT, fIN = 68MHz and 69MHz 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 0 10 20 30 FREQUENCY (MHz) 225812 TA01b 225812fd 1 LTC2258-12 LTC2257-12/LTC2256-12 Absolute Maximum Ratings (Notes 1, 2) Supply Voltages (VDD, OVDD)........................ –0.3V to 2V Analog Input Voltage (AIN+, AIN–, PAR/SER, SENSE) (Note 3)........... –0.3V to (VDD + 0.2V) Digital Input Voltage (ENC+, ENC–, CS, SDI, SCK) (Note 4)..................................... –0.3V to 3.9V SDO (Note 4).............................................. –0.3V to 3.9V Digital Output Voltage................. –0.3V to (OVDD + 0.3V) Operating Temperature Range: LTC2258C, LTC2257C, LTC2256C............. 0°C to 70°C LTC2258I, LTC2257I, LTC2256I............–40°C to 85°C Storage Temperature Range................... –65°C to 150°C Pin Configurations FULL-RATE CMOS OUTPUT MODE TOP VIEW DOUBLE DATA RATE CMOS OUTPUT MODE TOP VIEW VDD SENSE VREF VCM OF DNC D11 D10 D9 D8 VDD SENSE VREF VCM OF DNC D10_11 DNC D8_9 DNC AIN+ 1 AIN– 2 GND 3 REFH 4 40 39 38 37 36 35 34 33 32 31 30 D7 29 D6 28 CLKOUT+ 27 CLKOUT– REFH 5 REFL 6 41 26 OVDD 25 OGND REFL 7 24 D5 PAR/SER 8 23 D4 VDD 9 VDD 10 22 D3 21 D2 11 12 13 14 15 16 17 18 19 20 AIN+ 1 AIN– 2 GND 3 REFH 4 40 39 38 37 36 35 34 33 32 31 30 D6_7 29 DNC 28 CLKOUT+ 27 CLKOUT– REFH 5 REFL 6 41 26 OVDD 25 OGND REFL 7 24 D4_5 PAR/SER 8 23 DNC VDD 9 VDD 10 22 D2_3 21 DNC 11 12 13 14 15 16 17 18 19 20 ENC+ ENC– CS SCK SDI SDO DNC DNC D0 D1 ENC+ ENC– CS SCK SDI SDO DNC DNC DNC D0_1 UJ PACKAGE 40-LEAD (6mm × 6mm) PLASTIC QFN TJMAX = 150°C, θJA = 32°C/W EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB UJ PACKAGE 40-LEAD (6mm × 6mm) PLASTIC QFN TJMAX = 150°C, θJA = 32°C/W EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB DOUBLE DATA RATE LVDS OUTPUT MODE TOP VIEW VDD SENSE VREF VCM OF+ OF– D10_11+ D10_11– D8_9+ D8_9– 2 AIN+ 1 AIN– 2 GND 3 REFH 4 40 39 38 37 36 35 34 33 32 31 30 D6_7+ 29 D6_7– 28 CLKOUT+ 27 CLKOUT– REFH 5 REFL 6 41 26 OVDD 25 OGND REFL 7 24 D4_5+ PAR/SER 8 23 D4_5– VDD 9 VDD 10 22 D2_3+ 21 D2_3– 11 12 13 14 15 16 17 18 19 20 ENC+ ENC– CS SCK SDI SDO DNC DNC D0_1– D0_1+ UJ PACKAGE 40-LEAD (6mm × 6mm) PLASTIC QFN TJMAX = 150°C, θJA = 32°C/W EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB For more information www.linear.com/LTC2258-12 225812fd LTC2258-12 LTC2257-12/LTC2256-12 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2258CUJ-12#PBF LTC2258CUJ-12#TRPBF LTC2258UJ-12 40-Lead (6mm × 6mm) Plastic QFN 0°C to 70°C LTC2258IUJ-12#PBF LTC2258IUJ-12#TRPBF LTC2258UJ-12 40-Lead (6mm × 6mm) Plastic QFN –40°C to 85°C LTC2257CUJ-12#PBF LTC2257CUJ-12#TRPBF LTC2257UJ-12 40-Lead (6mm × 6mm) P.


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