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RF Attenuators

IDT’s digital step attenuators (DSA) reduce transient “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 Glitch-Free™ DSA enables customers to simplify their software interface, improve reliability, and prevent damage to expensive sub-assemblies such as power amplifiers.

Reduces transient “glitches” up to 95%

The IDT F1950 (7-bit) and the F1951 (6-bit) are digital step attenuators optimized for the demanding requirements of base transceiver station (BTS) receive, transmit, and digital pre-distortion (DPD) paths. IDT’s innovative Glitch-Free technology eliminates attenuation setting overshoot (glitches) from the transmit and receive paths of cellular communication systems, while at the same time reducing insertion loss and improving distortion performance. This significantly simplifies the hardware and software interfaces within the BTS, reducing cost and minimizing overhead. The extremely low IM3 distortion improves DPD path performance, enabling better transmitter spectral mask compliance and lower power consumption.

The F1950 and F1951 operate from 100 MHz to 4000 MHz, and can communicate via a parallel or serial interface. The DSAs feature very low insertion loss (< 1.3 dB at 2 GHz) and are extremely accurate (< 0.2 dB over temperature), allowing for improved sensitivity and signal-to-noise ratio (SNR) in the receiver path.

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FunctionInput Freq (MHz)Output Freq Range (MHz)Supply Voltage (V)Pkg. TypeLead Count (#)Input IP3 (dBm)Gain (dB)Gain Resolution (dB)Noise Figure dB (dB)
F1950 DatasheetF1950 Block DiagramF1950
7-bit 0.25 dB Glitch-Free™...
7-bit DSA150 - 4000150 - 40003 - 5.25BOARD, VFQFPN0, 2465-1.30.251.3
F1951 DatasheetF1951 Block DiagramF1951
6-bit 0.50 dB Glitch-Free™...
6-bit DSA100 - 4000100 - 40003 - 5.25BOARD, VFQFPN0, 2465-1.20.51.2
F1953 Final DatasheetIDTF1953 - Block DiagramF1953
6-bit 0.50dB Glitch-Free™ ...
6-bit DSA w/integrated DC blocks400 - 4000400 - 40002.7 - 3.3BOARD, VFQFPN0, 2062-1.40.51.4