F1975 Datasheet | IDT

Description The F1975 Digital Step Attenuator (DSA) is a product in IDT’s Glitch-Free TM 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 pact 4mm  4mm, 20-pin Thin QFN package with a 75Ω impedance for ease of integration. Advantages Digital step attenuators are used in receivers and transmitters to provide gain control. The F1975 is a 6-bit step attenuator optimized for these demanding applications. The silicon design has very low insertion loss and low distortion (+64d Bm IIP3). The device has pinpoint attenuation accuracy. Most importantly, the F1975 includes IDT’s Glitch-Free TM technology, which results in low overshoot and ringing during most significant bit (MSB) transitions. - Glitch-Free TM 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) 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 - 31.5d B control range - 0.5d B step - Glitch-Free TM technology, low transient overshoot - 3.0V to 5.25V supply - 1.8V or 3.3V control logic - Attenuator step error: 0.1d B at 1GHz - Low insertion loss: 1.2d B at 1GHz - Ultra-linear IIP3: +64d Bm - IIP2: +125d Bm typical - Stable integral non-linearity over temperature - Low current consumption: 550µA typical - Bi-directional - Operating temperature: -40°C to +105°C - 4mm  4mm, 20-pin QFN package Block Diagram Figure 1. Block Diagram RF1 Glitch-Free TM RF2 Bias Decoder VD D VMODE D[5:0]...