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F1978 Datasheet(PDF) 1 Page - Integrated Device Technology |
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F1978 Datasheet(HTML) 1 Page - Integrated Device Technology |
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1 / 26 page  6-Bit, 75Ω Digital Step Attenuator 5MHz to 3GHz F1978 Datasheet © 2017 Integrated Device Technology, Inc. 1 Rev O August 28, 2017 Description The F1978 Digital Step Attenuator (DSA) is a product in IDT’s Glitch-FreeTM DSA Family, which is optimized for the demanding requirements of CATV and satellite systems. It operates in the frequency range of 5MHz to 3000MHz. This device is offered in a compact 4mm 4mm, 20-pin Thin QFN package with a 75 Ω impedance for ease of integration. The F1978 DSA has RF performance identical to the F1975 Digital Step Attenuator. The difference between the F1978 and F1975 is that the F1978 has an additional programming mode called Direct Serial Programming. Consult the “Programming” section of this datasheet or the application note AN-945 “Comparison of F1975 and F1978 Digital Step Attenuator Serial Programming Methods .” Advantages Digital step attenuators are used in receivers and transmitters to provide gain control. The F1978 is a 6-bit step attenuator optimized for these demanding applications. The silicon design has very low insertion loss and low distortion (+64dBm IIP3). The device has pinpoint attenuation accuracy. Most importantly, the F1978 i ncludes IDT’s Glitch-FreeTM technology, which results in low over- shoot and ringing during most significant bit (MSB) transitions. Glitch-FreeTM technology protects the power amplifier or analog-to-digital converter (ADC) from damage during transitions between attenuation states Extremely accurate attenuation levels Ultra-low distortion Low insertion loss for best signal-to-noise ratio (SNR) Allows direct serial programming of attenuation Typical Applications CATV infrastructure CATV set-top boxes CATV satellite modems Data network equipment Fiber networks Features Frequency: 5MHz to 3000MHz Serial and 6-bit parallel interface 31.5dB control range 0.5dB step Glitch-FreeTM technology, low transient overshoot 3.0V to 5.25V supply 1.8V or 3.3V control logic Attenuator step error: 0.1dB at 1GHz Low insertion loss: 1.2dB at 1GHz Ultra-linear IIP3: +64dBm IIP2: +125dBm typical Stable integral non-linearity over temperature Low current consumption: 550µA typical Bi-directional Operating temperature: -40°C to +105°C 4mm 4mm, 20-TQFN package Block Diagram Figure 1. Block Diagram Decoder RF1 RF2 SPI Bias Glitch-Free TM |
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