CDB42438 Cirrus Logic Inc, CDB42438 Datasheet - Page 32

• Manufacturer Part Number: CDB42438
• Description: Eval Bd 108dB 6&8ch Multi-Chnl CODECs
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42438

• Main Purpose: Audio, CODEC
• Embedded: Yes, FPGA / CPLD
• Utilized Ic / Part: CS42438
• Primary Attributes: 6 Single-Ended and 2 Differential Analog Inputs and 8 Outputs, S/PDIF Transmitter and Receiver
• Secondary Attributes: Graphic User Interface
• Description/function: Audio CODECs
• Operating Supply Voltage: 5 V to 12 V
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: CS42438
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant, Contains lead / RoHS non-compliant
• Other names: 598-1500

32
5.3.3
5.3.4
5.3.3.1
DAC Volume Control and Mute are not accessible in Hardware Mode.
5.3.3.2
Digital Volume Control
Each DAC’s output level is controlled via the Volume Control registers operating over the range of 0 to
-127.5 dB attenuation with 0.5 dB resolution. See
page
trolled by the SZC[1:0] bits in the Digital Volume Control register. See
on page
Each output can be independently muted via mute control bits in the register
dress 07h)” on page
maximum value (-127.5 dB). When the AOUTx_MUTE bit is disabled, the corresponding DAC returns to
the attenuation level set in the Volume Control register. The attenuation is ramped up and down at the
rate specified by the SZC[1:0] bits.
De-Emphasis Filter
The CS42438 includes on-chip digital de-emphasis optimized for a sample rate of 44.1 kHz. The filter re-
sponse is shown in
that utilize 50/15 μs pre-emphasis equalization as a means of noise reduction.
De-emphasis is only available in Single-Speed Mode. Please see
(DAC_DEM)” on page 44
47. Volume control changes are programmable to ramp in increments of 0.125 dB at the rate con-
45.
5.0 V
Hardware Mode
Software Mode
VA
Figure
47. When enabled, each AOUTx_MUTE bit attenuates the corresponding DAC to its
AOUTx+
AOUTx-
for de-emphasis control.
13. The de-emphasis feature is included to accommodate audio recordings
Figure 12. Full-Scale Output
(AOUTx+) - (AOUTx-) = 6.5 V
Full-Scale Differential Output Level =
“AOUTX Volume Control (Addresses 08h- 0Fh)” on
PP
= 2.3 V
RMS
“Transition Control (Address 06h)”
2.5 V
2.5 V
4.125 V
0.875 V
4.125 V
0.875 V
“DAC De-Emphasis Control
“DAC Channel Mute (Ad-
CS42438
DS646F2