Cirrus Logic CDB5374 - Manual (Page 40)

CDB5374
40 DS862DB1
3.3.3 Analog Front End
The Analog Front End sub-panel configures the amplifier, modulator, and test DAC pin options. Pin op-
tions are controlled through the GPIO outputs of the digital filter.
Any changes made under this sub-panel will not be applied to the target board until the Configure button
is pushed. The Configure button writes the new configuration to the target board and then enables the
data Capture button.
3.3.4 Test Bit Stream
The Test Bit Stream sub-panel configures test bit stream (TBS) generator parameters. The digital filter
data sheet describes TBS operation and options.
The DAC Quick Set controls automatically set the Interpolation, Clock Rate, and Gain Factor controls
based on the selected Mode, Freq, and Gain. Additional configurations can be programmed by writing the
Interpolation, Clock Rate, and Gain Factor controls manually.
Any changes made under this sub-panel will not be applied to the target board until the Configure button
is pushed. The Configure button writes the new configuration to the target board and then enables the
data Capture button.
Control Description
Amp Mux Selects the input source for the CS5374 amplifiers. An internal termination, external
INA inputs or external INB inputs can be selected.
DAC Mode Selects the operational mode of the CS4373A test DAC. The test DAC operational
modes are AC dual output (OUT&BUF), AC precision output (OUT only), AC buffered
output (BUF only), DC common mode output (DC Common), DC differential output
(DC Diff), or AC common mode output (AC Common). The test DAC can also be
powered down (PWDN) when not in use to save power.
Gain Sets the amplifier gain range and test DAC attenuation. Amplifier gain and DAC
attenuation settings of 1x, 2x, 4x, 8x, 16x, 32x, or 64x can be selected and are con-
trolled together.
Sw Disabled for CDB5374.
Control Description
DAC Quick Set Automatically sets test bit stream options. Mode selects sine or impulse output mode,
Freq selects the test signal frequency for sine mode, and Gain selects the test signal
amplitude in dB.
Interpolation Manual control for the data interpolation factor of the test bit stream generator.
Clock Rate Manual control for the output clock and data rate of the test bit stream generator.
Gain Factor Manual control to set the test bit stream signal amplitude.
Sync Enables test bit stream synchronization by the MSYNC signal.
Loopback Enables digital loopback from the test bit stream generator output to the digital filter
input.