default or selected kernelversion does not have config value CONFIG_AD9739A.
Result is shown for kernelversion 6.10-rc4

Analog Devices AD9739A RF DAC spi driver

modulename: ad9739a.ko

configname: CONFIG_AD9739A

Linux Kernel Configuration
└─>Device Drivers
└─>Industrial I/O support
└─>Digital to analog converters
└─>SPI support
└─>Analog Devices AD9739A RF DAC spi driver
Say yes here to build support for Analog Devices AD9739A Digital-to
Analog Converter.

The driver requires the assistance of the AXI DAC IP core to operate,
since SPI is used for configuration only, while data has to be
streamed into memory via DMA.

To compile this driver as a module, choose M here: the module will be
called ad9739a.

source code:

depends
CONFIG_IIO
CONFIG_COMPILE_TEST or CONFIG_SPI