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Linear Tech ADC reduces cellular basestation costs

Posted: 16 Mar 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? analog to digital converter? adc? ltc1750? ltc1749?

Providing designers of cellular basestations with improvements in dynamic performance, Linear Technology Corp.'s 14-bit analog to digital converter (ADC) provides wide input bandwidth and excellent dynamic performance for direct intermediate frequency (IF) digitizing applications.

The LTC1750 simplifies the design and reduces the cost of cellular basestations by eliminating the second IF down-conversion stage. It undersamples up to 500MHz input frequencies and delivers 84dB spurious free dynamic range (SFDR) with 140MHz inputs and 74dB SFDR with 350MHz inputs.

The 80MSps ADC's wide bandwidth and ac performance are suitable for use in cellular basestations and broadband software radios, where it can directly digitize the first IF and eliminate the second IF down-conversion stage. It offers the flexibility to configure the input and the output specifically for the application, and its on-chip programmable gain amplifier (PGA) allows multiple input ranges to optimize the performance.

The larger input range offers industry-leading low noise, and the smaller range lowers the gain requirements on the drive circuitry, making it easier to meet the IP3 requirements. If the input ever goes out of range, there is automatic indicator on the overflow pin. A separate digital output supply pin allows connection to low voltage DSPs, FIFOs or logic as low as 0.5V.

The LTC1749 is a pin-compatible 12-bit version of the LTC1750 allowing multiple price/performance products with one design. For other high-speed applications, the device extends from 25Msps to 80Msps and from 12-bits to 14-bits. Each product is available in the 48-pin TSSOP package for both the commercial and the industrial temperature ranges. Pricing for 1,000-piece quantities begins at $32.30 for the LTC1750 and $19.55 for the LTC1749.

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