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RF Attenuators

IDT offers a wide range of monolithic silicon RF Attenuators that utilize either digital or analog control. All of IDT’s RF attenuators offer broad bandwidth, low insertion loss, high linearity with high attenuation accuracy, and low error. Applications supported by these RF attenuators include wireless infrastructure (base stations, broadband infrastructure (CATV), microwave radios, satellite and data terminals, general purpose communication equipment, and test and measurement equipment.

IDT pioneered “Glitch-Free™” technology Digital Step Attenuators (DSAs), which enable customers to simplify their software interface, improve reliability, prevent damage to expensive sub-assemblies such as power amplifiers, and limit over-ranging of data converter inputs. Our innovative Glitch-Free™ technology eliminates attenuation setting overshoot (glitches) from the transmit and or receive paths by reducing transient “glitches” during most significant bit (MSB) transitions by up to 95 percent.

Alternatively, IDT’s Voltage Variable Attenuators (VVA) offer customers analog control for applications that require more precise attenuation. These VVA’s have nearly half the insertion loss of competitive solutions, high IP3 performance, and are linear in dB attenuation across the voltage control range. By using silicon-based RF semiconductor technology, IDT’s attenuators offer a robust alternative to older GaAs-based semiconductor technology. Silicon technology offers the advantages of more robust electrostatic discharge (ESD) protections, better moisture sensitivity levels (MSL), improved thermal performance, lower current consumption, and the proven reliability of silicon technology.

About RF Attenuators and Digital Attenuators

The purpose of an RF attenuator in a radio transmitter or receiver signal chain is to allow adjustment of signal amplitude based on the needs of the system. The attenuation value is typically adjusted using either digital attenuator (DSA) or by analog attenuator(VVA). There are trade-offs for selecting an analog or digital attenuator based on the application requirements. IDT's expert engineers are available to assist customers in selecting the most appropriate devices.


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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)
F1912 Datasheet REV 01F1912 Block DiagramF1912
6-bit 0.5 dB Glitch-Free™ ...
6-bit DSA1 - 40001 - 40003 - 5.25VFQFPN2063-1.40.5
F1950 DatasheetF1950 Block DiagramF1950
7-bit 0.25 dB Glitch-Free™...
7-bit DSA150 - 4000150 - 40003 - 5.25VFQFPN2465-1.30.25
F1951 DatasheetF1951 Block DiagramF1951
6-bit 0.50 dB Glitch-Free™...
6-bit DSA100 - 4000100 - 40003 - 5.25VFQFPN2468-1.20.5
F1953 Final DatasheetIDTF1953 - Block DiagramF1953
6-bit 0.50dB Glitch-Free™ ...
6-bit DSA w/integrated DC blocks400 - 4000400 - 40002.7 - 3.3VFQFPN2063-1.40.5
F1956 Datasheet REV1F1956 PinoutF1956
7-bit 0.25 dB Glitch-Free™...
7-bit DSA1 - 40001 - 40003 - 5.25VFQFPN3264-1.30.25
F2250 DatasheetF2250 Block DiagramF2250
Wideband Voltage Variable RF...
Differential Input Amplifier, Voltage Variable Attenuator50 - 6000, 600 - 300050 - 6000, 600 - 30003.15 - 5.25, 4.75 - 5.25VFQFPN16, 2428.7, 65-1.4, 13.1
F2255 Datasheet REVOF2255 Block DiagramF2255
Wideband Voltage Variable RF...
Voltage Variable Attenuator1 - 30001 - 30003.15 - 5.25VFQFPN1660-1.1
F2258 Datasheet REVOF2258 Block DiagramF2258
Wideband Voltage Variable RF...
Voltage Variable Attenuator50 - 600050 - 60003.15 - 5.25VFQFPN1665-1.4