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US : National Semiconductor unveiled the industry’s first 14-bit, dual, 1 GHz-input bandwidth analog-to-digital converter (ADC) with serial low-voltage differential signaling (LVDS) outputs for demanding communications, test and measurement, and imaging applications.

At 105 mega-samples per second (MSPS), the ADC14DS105 heads a new family of 16 high-bandwidth, 12- and 14-bit ADCs. Designed with National’s unique low-power pipeline architecture on its 0.18u CMOS process technology, the ADC family’s high bandwidth performance enables excellent noise and distortion performance for 240 MHz and higher intermediate frequencies (IF).

The ADC14DS105 provides a typical signal-to-noise ratio (SNR) of 72 dB and a spurious free dynamic range (SFDR) of 83 dB at a 240 MHz input frequency. This performance allows high intermediate-frequency (IF) sampling to eliminate an IF stage, relaxes filtering constraints and permits multi-carrier architectures. For third-generation (3G) communication receivers, designers can select 12-bit products to digitize one or two carriers, or 14-bit products to digitize three or four carriers requiring a higher dynamic range.

The ADC family, with sample rates from 65 MSPS to 105 MSPS, features parallel CMOS or serial low-voltage differential signaling (LVDS) output options. The LVDS outputs reduce system noise while decreasing the number of input/output (I/O) pins and traces, enabling easier signal routing and flexible system partitioning.

About the ADCs
National offers the dual ADCs in a lead-free, 60-pin LLP® (leadless leadframe) package and the single ADCs in a lead-free, 32-pin LLP package. These ADCs give engineers the ability to upgrade between sampling rates and resolutions, selecting from any of the eight interchangeable dual-channel products or eight interchangeable single-channel products.

Part Number Bits Speed Channels Outputs
ADC14DS105 14 105 MSPS Dual Serial LVDS
ADC14DS095 14 95 MSPS Dual Serial LVDS
ADC14DS080 14 80 MSPS Dual Serial LVDS
ADC14DS065 14 65 MSPS Dual Serial LVDS

ADC12DS105 12 105 MSPS Dual Serial LVDS
ADC12DS095 12 95 MSPS Dual Serial LVDS
ADC12DS080 12 80 MSPS Dual Serial LVDS
ADC12DS065 12 65 MSPS Dual Serial LVDS

ADC14C105 14 105 MSPS Single CMOS
ADC14C095 14 95 MSPS Single CMOS
ADC14C080 14 80 MSPS Single CMOS
ADC14C065 14 65 MSPS Single CMOS

ADC12C105 12 105 MSPS Single CMOS
ADC12C095 12 95 MSPS Single CMOS
ADC12C080 12 80 MSPS Single CMOS
ADC12C065 12 65 MSPS Single CMOS

Pricing and Availability
Samples of selected ADCs are available for qualified customers through National’s local sales offices, with production quantities scheduled for release throughout 2007. The dual ADC14DS105 is priced at $82.35 each and the single ADC14C105 is priced at $41 each in 1,000-unit quantities.

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