The ADRV series of chips from Analog Devices are used in software-defined radio platforms. With built-in dual transceivers they enable a range of functionality that’s not possible with other SDRs.
Let’s get into the details.
This table summarizes the specifications of the two products.
|Frequency Range||30 MHz to 6000 MHz||30 MHz to 6000 MHz|
|Transceivers||2 * Tx + 2 * Rx||2 * Tx + 2 * Rx|
|IF Bandwidth||12 kHz to 40 MHz||12 kHz to 40 MHz|
|Interface Protocols||LVCMOS SSI, LVDS SSI, SPI||LVCMOS SSI, LVDS SSI, SPI|
|Rx Image Rejection||85 dB||85 dB|
|Rx Noise Figure||12 dB||12 dB|
|Rx Input IP3||+27 dBm||+27 dBm|
|Tx Output IP3||+30 dBm||+30 dBm|
|DPD Linearization||Up to 20 MHz||N/A|
As can be seen from the table, almost all the specifications are identical.
Difference between ADRV9002 and ADRV9004
The only difference between the ADRV9002 and ADRV9004 is DPD (Digital Pre-Distortion) Linearization. The ADRV9002 has this capability and as a result is better suited for signal transmission.
What does DPD do?
The Digital Pre-Distortion function compensates for non-linearity in the response of the Transmit Power amplifier. The result is a linear output from the PA.
What is the benefit of DPD?
The DPD capability allows the transceiver to drive the PA closer to saturation. This facilitates a higher efficiency power amplifier while maintaining linearity.
In this post we have explained the differences between the ADRV9002 and ADRV9004. The two products are very similar. However the ADRV9002 is better suited for transmitter applications.
Both products are in the $300+ price range in large quantities, so they are better suited to software-defined radios at a higher price point. None of the SDRs in the $500 or less price range that we have reviewed for instance use these parts.