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LTC1744 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1744 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1744 1744f 14-Bit, 50Msps ADC s Sample Rate: 50Msps s 77dB SNR and 87dB SFDR (3.2V Range) s 73.5dB SNR and 90dB SFDR (2V Range) s No Missing Codes s Single 5V Supply s Power Dissipation: 1.2W s Selectable Input Ranges: ±1V or ±1.6V s 150MHz Full Power Bandwidth S/H s Pin Compatible Family 25Msps: LTC1746 (14 Bit), LTC1745 (12 Bit) 50Msps: LTC1744 (14 Bit), LTC1743 (12 Bit) 65Msps: LTC1742 (14 Bit), LTC1741 (12 Bit) 80Msps: LTC1748 (14 Bit), LTC1747 (12 Bit) s 48-Pin TSSOP Package s Telecommunications s Receivers s Base Stations s Spectrum Analysis s Imaging Systems , LTC and LT are registered trademarks of Linear Technology Corporation. OF 14-BIT PIPELINED ADC 14 S/H CIRCUIT ±1V DIFFERENTIAL ANALOG INPUT AIN + AIN – SENSE VCM 4.7 µF DIFF AMP REFLA REFHB GND 1744 BD ENC 4.7 µF 0.1 µF 0.1 µF 1 µF1µF REFHA REFLB BUFFER RANGE SELECT 2.5VREF CORRECTION LOGIC AND SHIFT REGISTER OUTPUT LATCHES CONTROL LOGIC OVDD VDD OGND 0.5V TO 5V 5V 0.1 µF 1 µF 1 µF 1 µF D13 D0 CLKOUT • • • ENC DIFFERENTIAL ENCODE INPUT OE MSBINV 0.1 µF The LTC ®1744 is a 50Msps, sampling 14-bit A/D con- verter designed for digitizing high frequency, wide dynamic range signals. Pin selectable input ranges of ±1Vand±1.6V along with a resistor programmable mode allow the LTC1744’s input range to be optimized for a wide variety of applications. The LTC1744 is perfect for demanding communications applications with AC performance that includes 77dB SNR and 87dB spurious free dynamic range. Ultralow jitter of 0.3psRMS allows undersampling of IF frequencies with excellent noise performance. DC specs include ±4LSB maximum INL and no missing codes over temperature. The digital interface is compatible with 5V, 3V and 2V logic systems. The ENC and ENC inputs may be driven differen- tially from PECL, GTL and other low swing logic families or from single-ended TTL or CMOS. The low noise, high gain ENC and ENC inputs may also be driven by a sinusoidal signal without degrading performance. A separate output power supply can be operated from 0.5V to 5V, making it easy to connect directly to any low voltage DSPs or FIFOs. The TSSOP package with a flow-through pinout simplifies the board layout. 50Msps, 14-Bit ADC with a ±1V Differential Input Range DESCRIPTIO FEATURES APPLICATIO S BLOCK DIAGRA |
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