12-Bit ADCs for WiMAX provide industry’s highest SFDR of 84.1dB at 250MHz input frequency

National Semiconductor Corporation has introduced two 12-bit 170 MSPS ADCs, and a 14-bit, 155 MSPS ADC, each with a full-power bandwidth of 1.1GHz. Available in dual data rate, low-voltage differential signaling (LVDS) and CMOS output options, the ADCs are targeted at demanding WiMAX and 3G wireless communications applications. In high intermediate frequency (IF) sampling receiver applications, the 1.1GHz bandwidth capability of these ADCs provides high SFDR, and SNR performance that extends well beyond 250MHz input frequencies. This enables the system designer to digitize the signal at the first IF, thereby eliminating a down conversion stage, which reduces component count and system power.

The 12-bit ADC12C170 with parallel CMOS outputs, and 12-bit ADC12V170 with dual data rate, parallel LVDS outputs offer the industry’s highest SFDR above 250MHz input frequencies. Compared to competitive devices, the ADC12C170 at 84.1dB offers 5.5dB better SFDR, and the ADC12V170 at 83dB offers 3.8dB better SFDR at an input frequency of 250MHz.

At 1.1 GHz, the ADC14V155 delivers 57% higher full-power bandwidth than competing 14-bit ADCs. The device also provides an industry-leading SFDR of 85dB and SNR of 69.5dB at an input frequency of 238MHz.

National Semiconductor, www.national.com



Caption

National Semiconductor’s 12- and 14-bit devices targeted at wireless infrastructure applications enable architectures with decreased component count and increased power efficiency.