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Hardware Integration Guide
Table 57.
Analog Audio Interface Characteristics
Analog Audio
Input Impedance
Signal Level – Differential
Audio IN
Signal Level – Single-ended
(the unused audio signal must be tied to
GND or analog reference)
Signal Level – Differential
Signal Level – Single-ended
Audio OUT
Output Impedance
Signal Drive Strength – Application Load
6.15.2. Digital Audio
The AirPrime AR7558 provides a 4-wire digital audio interface. This interface can be configured as
either a PCM or an I2S.
Table 58.
Digital Audio Interface Pads
Pad
Name
DB3
PCM_FS
DA3
PCM_CLK
DC2
PCM_DOUT
DD2
PCM_DIN
1 Direction when defined in Master mode.
6.15.2.1.
PCM
The AirPrime AR7558 PCM interface can be configured in one of two modes: primary PCM or
auxiliary PCM mode. The table below defines the configurations for each of these two modes.
Table 59.
PCM Interface Configurations
Element
Slot Configuration
Sync type
Frequency
Duty Cycle
Clock (Master)
Data formats
AirPrime AR7558 Master/Slave
4116922
PCM
1
Direction
Function
PCM Frame
Output
Sync
Output
PCM Clock
Output
PCM Data Out
Input
PCM Data In
Primary PCM
Slot-based
Short
2.048 MHz
16-bit linear, 8-bit A-law, 8-bit m-law
Master or Slave
Rev 1.1
Min.
Typ.
16
20
-0.3
-
-0.3
-
-
-
-0.3
-
-0.3
-
-
600
Direction
I2S Function
Input/Output
I2S_WS
Input/Output
I2S_SCLK
Output
I2S_DOUT
Input
I2S_DIN
Auxiliary PCM
Single
Long
8 kHz
50%
128 kHz
Master
Baseband Specification
Max.
Units
24
kΩ
2.9
dBV
2.9
dBV
dBV
2.9
dBV
Ω
2.9
1M
kΩ
If Unused
Leave Open
Leave Open
Leave Open
Leave Open
January 21, 2015
42
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