GRF6412

31.75 dB Range / 0.25dB Step Digital VGA

0.05 to 8 GHz

31.75 dB Range / 0.25dB Step Digital VGA

0.05 to 8 GHz

The GRF6412 is a SPI-controlled, 31.75 dB range digital variable gain amplifier (DVGA) which provides precise stepping in 0.25 dB increments. The device’s serial interface utilizes three externally defined address bits, allowing up to 8 unique devices to share a common SPI bus. In addition to supporting traditional serial programming, the GRF6412 also includes a special Rapid Fire™ selection pin which allows the device to be immediately switched into a pre-defined attenuation state.

In terms of performance, the GRF6412 can cover the entire 50 MHz to 8 GHz range while still maintaining flat gain as well as precise and monotonic gain stepping. Glitching has been minimized to < 2 dB for all steps. The flexibility of the bi-directional attenuator also allows the device to support DSA+AMP as well as AMP+DSA cascaded configurations.

Categories & Markets

Applications

• Wireless Infrastructure
• Automotive Cellular and V2X Compensators
• High Performance Gain Trim & AGC Loops

Features

• 31.75dB range with 0.25dB steps via 7-bit Control
• Serial Interface with Support for 8 Addresses
• Programmable Rapid Fire™ Attenuation Setting Which Circumvents Delays Associated with SPI Programming
• Glitchless Stepping (< 2dB Over/Undershoot)
• DSA Supports Bi-directional RF Use
• 3.3 V and 5 V Supply Voltages
• 50 Ω Single-ended Input and Output Impedances
• -40 to 115 °C Operating Temperature Range
• Compact 4 x 4 mm QFN-24 Package

Reference: 5.0V/2.0GHz/DSA+AMP Cascade/Max G

• Gain: 19.2 dB
• Noise Figure: 2.6 dB
• OP1dB: 22.5 dBm
• OIP3: 37 dBm
• INL Attenuation Error: 0.04 dB
• DNL Attenuation Error: 0.05 dB

Reference: 5.0V/2.0GHz/AMP+DSA Cascade/Max G

• Gain: 19.2 dB
• Noise Figure: 1.8 dB
• OP1dB: 21.7 dBm
• OIP3: 35.7 dBm
• INL Attenuation Error: 0.04 dB
• DNL Attenuation Error: 0.05 dB