Rev 6.0
28
User Guide
Features Configuration and Limitations
4.2.
Optional Pad Configuration
4.2.1.
PCM Voltage Level Shifter Selection
Because the voltage level output of the PCM varies between the HL6528, HL6528RD and HL8548
(with the HL6528 and HL6528RD having 2.8 V, and the HL8548 having 1.8 V), optional component
configuration is made available in the Q26 Carrier Board.
The Q26 Carrier Board
’s PCM interface is configured to use HL8548 (1.8 V) by default. When using
an HL6528 or HL6528RD module, resistors R301, R313, R322 and R323 must be removed and
resistors R336 and R337 installed if PCM is to be used. Otherwise, PCM should be turned and kept
off when using an HL6528 or HL6528RD module to prevent the application’s PCM codec from being
damaged with an incorrect carrier board configuration.
Note:
Ensure that the module used in the
Q26 Carrier Board is compatible with the carrier board’s PCM
configuration. Using a module with the incorrect carrier board configuration will damage the
customer’s PCM application.
Table 14.
Optional Component Configuration for PCM
Q26 Carrier Board with
HL6528, HL6528RD
Q26 Carrier Board with
HL8548
R336, R337
R301, R313, R322, R323 (default configuration)
Figure 3.
PCM Voltage Level Shifter
Figure 4.
Optional Components Placement
