CDB42L55 Cirrus Logic Inc, CDB42L55 Datasheet - Page 30

• Manufacturer Part Number: CDB42L55
• Description: Eval Bd Ultra Low Power Stereo Codec
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42L55

• Main Purpose: Audio, CODEC
• Embedded: Yes, FPGA / CPLD
• Utilized Ic / Part: CS42L55
• Primary Attributes: 2 Stereo Analog Inputs, Stereo Line and Headphone Outputs, S/PDIF Transmitter and Receiver
• Secondary Attributes: GUI, USB, RS232, I2C Interfaces, USB or External or Battery Power Supply
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1506; CDB-42L55

30
-10 dB
Amplifier Rail
- VCP
Output Level
- VCP
When the charge pump transitions from the higher set of rail voltages to the lower set, there is a one sec-
ond delay before the charge pump supplies the lower rail voltages to the amplifiers. This hysteresis en-
sures that the charge pump doesn't toggle between the two rail voltages as signals approach the clip
threshold. It also prevents clipping in the instance of repetitive high level transients in the input signal. The
timing diagram for this transitional behavior is detailed in
VCP
VCP
2
Voltage
2
+VCP
+VCP
-VCP
-VCP
2
2
Ideal Transition
Ideal Transition
Figure 16. VHPFILT Hysteresis
Figure 15. VHPFILT Transitions
Actual Transition caused
Actual Transition caused
by VHPFILT Capacitor
by VHPFILT Capacitor
1 second
Figure
16.
Time
Time
Time
CS42L55
DS773F1