New TI 14-Bit, 400MSPS Digital-to-Analog Converter Targets Multi-Carrier Wireless Base Transceiver Stations

date: December 11, 2001

Offering the industry's highest performance for high data rate digital communications applications, Texas Instruments Incorporated introduced a new high-speed, high-resolution and LVDS compatible digital-to-analog converter (DAC). The new 14-bit resolution DAC enables transmission of 3G multi-carrier wideband CDMA (WCDMA) and supports additional major wireless standards such as CDMA2000, IS-95, GSM, GPRS, EDGE and IS-136, as well as other digital applications based on QAM and QPSK modulation techniques.

TI's DAC5675 maintains excellent dynamic performance at high output frequencies at up to 400 MSPS of data throughput. The high speeds enable direct digital intermediate frequency (IF) transmission at high intermediate frequencies, thus eliminating a mix-up stage from the signal chain and enabling the support of up to four WCDMA carriers in a single channel. Moreover, the DAC5675 features a 68 dB WCDMA adjacent channel power ratio (ACPR) at 150 MHz IF. For multi-carrier narrow-band applications, the DAC5675 provides a low intermodulation distortion (IMD3) of -82 dBc at 100 MHz IF.

The high dynamic range of the new DAC5675 allows developers of cellular base transceiver stations, broadband wireless access and point-to-point microwave equipment, cable modem head ends and high-end test equipment to reduce system cost by relaxing filter specifications and reducing component count.

The DAC5675 is the first DAC to offer a low-voltage differential signaling (LVDS) interface, typically an option in ASIC and FPGA libraries, capable of providing a high-data rate direct interface to on-board ASICs and FPGAs. In addition, the LVDS interface of the DAC5675 lowers electromagnetic interference (EMI) in the system.

Support for system development includes an evaluation module (EVM) and documentation. For interfacing to other types of logic, such as digital signal processors (DSPs), TI offers the SN65LVDS387 CMOS-to-LVDS translator.

Samples of TI's 14-bit DAC5675 high-speed data converter are available now, with volume production scheduled for January 2002. The device is packaged in a 48-lead high-temperature quad flatpack (HTQFP) with PowerPad. Planned pricing in quantities of 1,000 is $34.50.

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