Analog-To-Digital Converter digitizes high-frequency signals.
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Press Release Summary:
Model LTC1748 80 Msps, 14-bit converter offers 76.3 dB signal to noise ratio and 90 dB spurious free dynamic range for high speed applications. Undersampling 70 MHz input, unit delivers 75.4 dB SNR and 80 dB SFDR. Sample and hold bandwidth of 250 MHz allows for undersampling of input frequencies in excess of 70 MHz. Input can span ±1 V to ±1.6 V to optimize dynamic performance. Separate digital output supply pin is provided for connections to low voltage DSPs and FIFOs.
Original Press Release:
80Msps, 14-Bit ADC Digitizes High Frequency Wide Dynamic Range Signals for Communications
MILPITAS, CA - June 23 - Linear Technology Corporation introduces the LTC1748, an 80Msps, 14-bit Analog to Digital Converter (ADC) offering excellent dynamic range, 76.3dB signal to noise ratio (SNR) and a 90dB spurious free dynamic range (SFDR) for high speed applications. Undersampling a 70MHz input, the LTC1748 delivers 75.4dB SNR and 80dB SFDR. The device's excellent AC performance is ideal for applications in cellular basestations, communication test equipment and broadband software radios.
The LTC1748 offers the flexibility to configure the input and the output specifically for the application. The 250MHz sample and hold bandwidth allows for undersampling of input frequencies in excess of 70MHz. The input can span ±1V to ±1.6V to optimize the dynamic performance. With a ±1V span, the LTC1748 delivers 72.5dB SNR and 90dB SFDR, but with a ±1.6V span, it delivers 76.1dB SNR and 88dB SFDR, both at 30MHz. If the input ever goes out of range, there is an automatic indicator on the overflow pin. The LTC1748 has a separate digital output supply pin for easy connections to low voltage DSPs and FIFOs.
The LTC1748 is one device in a family of pin-compatible high speed ADCs. The family includes the LTC1747 12-Bit, 80Msps ADC; LTC1742 14-Bit, 65Msps ADC; and LTC1741 12-Bit, 65Msps ADC. Each device is available in the 48-pin TSSOP package for both commercial and industrial temperature ranges.
Pricing for 1,000-piece quantities begins at $32.30 each for the LTC1748, $19.55 each for the LTC1747, $24.65 each for the LTC1742 and $12.75 each for the LTC1741.
Summary of Features: LTC1748
Part # Bits Speed SNR SFDR Power Package Price 1k
LTC1748 14 80Msps 76.3dB 90dB 1.4W TSSOP-48 $32.30
LTC1747 12 80Msps 72dB 85dB 1.4W TSSOP-48 $19.55
LTC1742 14 65Msps 76.5dB 90dB 1.275W TSSOP-48 $24.65
LTC1741 12 65Msps 72.2dB 85dB 1.275W TSSOP-48 $12.75
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products. READER SERVICE: Call toll-free 1-800-4-LINEAR (for literature only), or go to the company's web site: www.linear.com
