CDB42L51 Cirrus Logic Inc, CDB42L51 Datasheet - Page 41

• Manufacturer Part Number: CDB42L51
• Description: BOARD EVAL FOR CS42L51 CODEC
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42L51

• Main Purpose: Audio, CODEC
• Embedded: Yes, Other
• Utilized Ic / Part: CS42L51, CS8406, CS8415
• Primary Attributes: Stereo, Digital Audio Transmitter and Receiver
• Secondary Attributes: Graphic User Interface, S/PDIF Interface
• Description/function: Audio CODECs
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• For Use With/related Products: CS42L51
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1005

DS679F1
4.7
4.8
LRCK
SCLK
LRCK
SCLK
SDIN
SDIN
Initialization
The initialization and Power-Down sequence flowchart is shown in
ters a Power-Down state upon initial power-up. The interpolation and decimation filters, delta-sigma modu-
lators and control port registers are reset. The internal voltage reference, multi-bit DAC and ADC and
switched-capacitor low-pass filters are powered down.
The device will remain in the Power-Down state until the RESET pin is brought high. The control port is ac-
cessible once RESET is high and the desired register settings can be loaded per the interface descriptions
in
10 ms, the CODEC will enter Hardware Mode.
Once MCLK is valid, the quiescent voltage, VQ, and the internal voltage references, DAC_FILT+ and
ADC_FILT+ will begin powering up to normal operation. The charge pump slowly powers up and charges
the capacitors. Power is then applied to the headphone amplifiers and switched-capacitor filters, and the an-
alog/digital outputs enter a muted state. Once LRCK is valid, MCLK occurrences are counted over one LRCK
period to determine the MCLK/LRCK frequency ratio and normal operation begins.
Recommended Power-Up Sequence
1. Hold RESET low until the power supplies are stable.
2. Bring RESET high. After approximately 10 ms, the device will enter Hardware Mode.
3. For Software Mode operation, set the PDN bit to ‘1’b in under 10 ms. This will place the device in “stand-
4. Load the desired register settings while keeping the PDN bit set to ‘1’b.
5. Start MCLK to the appropriate frequency, as discussed in
6. Set the PDN bit to ‘0’b.
7. Apply LRCK,SCLK and SDIN for normal operation to begin.
8. Bring RESET low if the analog or digital supplies drop below the recommended operating condition to
M S B
“Software Mode” on page
by”.
prevent power glitch related issues.
AOUTA / AINxA
L eft C h a n n e l
AOUTA
L eft C h a n n el
M S B
Figure 21. Right-Justified Format (DAC only)
43. If a valid write sequence to the control port is not made within approximately
Figure 20. Left-Justified Format
L S B
L S B
M S B
Section
AOUTB / AINxB
R ig ht C h a n n e l
Figure 22 on page
4.5.
R ig ht C h a n n el
AOUTB
M S B
42. The CODEC en-
L S B
CS42L51
MSB
L S B
41