WM8990ECS/RV Wolfson Microelectronics, WM8990ECS/RV Datasheet - Page 117

• Manufacturer Part Number: WM8990ECS/RV
• Description: Audio CODECs Stereo CODEC w.Class AB/D speaker driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8990ECS/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

w
Production Data
LOOPBACK
Setting the LOOPBACK register bit enables digital loopback. When this bit is set the output data from
the ADC audio interface is fed directly into the DAC data input.
Table 64 Loopback Control
Note:
1.
2.
3.
R5 (05h)
REGISTER
ADDRESS
Master Mode: ADC and DAC left/right clocks must be set to the same pin when using
LOOPBACK function (ALRCGPIO1=1)
Slave Mode: It is recommended to set ALRCGPIO1=1 as well, otherwise ADCLRC and
DACLRC must be running at the same BCLK rate and in phase.
When the digital sidetone is enabled, ADC data will continue to be added to DAC data when
LOOPBACK is enabled.
0
BIT
LOOPBACK
LABEL
0b
DEFAULT
Digital Loopback Function
0 = No loopback
1 = Loopback enabled (ADC data output
is directly input to DAC data input).
DESCRIPTION
PD, March 2009, Rev 4.0
WM8990
117