Glitch-Free™ RF digital step attenuator with integrated blocking capacitors
The IDTP1953 is a 6-bit RF DSA optimized for the demanding requirements of base transceiver station (BTS) receive, transmit, and digital pre-distortion (DPD) paths. The device is pin- and control-compatible with competitors’ offerings, but integrates blocking capacitors and innovative design techniques to reduce the BOM and improve performance.
Built on IDT’s Glitch-Free™ technology platform, the IDTF1953 reduces transient overshoot, or “glitches”, during most significant bit (MSB) transitions by up to 95 percent in multi-standard 4G, 3G, and 2G cellular base station and industrial applications. IDT’s leading DSA solutions enable customers to simplify their software interface, improve reliability, and prevent damage to expensive sub-assemblies, such as power amplifiers.
The IDTF1953 operates from 400 MHz to 4000 MHz and covers a 31.5 dB attenuation range in 0.5 dB steps (6-bit). The device features extremely low IM3 distortion for improved DPD path performance, allowing for better transmitter spectral mask compliance and lower power consumption. In addition, the DSAs feature very low insertion loss (<1.35 dB at 2 GHz) and are extremely accurate (<0.25 dB over temperature), providing improved sensitivity and signal-to-noise ratio (SNR) in the receiver path.
The device is ideal for setting the power level in 4G long-term evolution (LTE), time-division duplex (TDD), wideband code division multiple access (WCDMA), extended global system for mobile communications (EGSM) and other popular systems. The DSA enhances IDT’s comprehensive wireless communications portfolio that includes RF mixers, variable gain amplifiers (VGAs), RapidIO® serial switching, industry-leading timing, data conversion and data compression products.
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