NXP Semiconductors
UM10340_5
TFA9879 demonstration PCB
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 05 — 30 aug. 2011
6 of 20
REF TYPE
Pin
Label
Description
4, 6, 8
GND
Ground
5
LRCK1
Word clock input 1
7
SCK1
Bit clock input 1
X5
Header, double row
1, 2, 9, 10
Not connected
3
SDI2
Data input 2
4, 6, 8
GND
Ground
5
LRCK2
Word clock input 2
7
SCK2
Bit clock input 2
X7
Terminal block, screw
1
OUTB
PWM output B (negative output)
2
OUTA
PWM output A (positive output)
X9
Stocko header
1
SCL
Serial clock input
2
GND
Ground
3
3.3V
3.3V supply output
4
SDA
Serial data I/O
X11 RCA Jack
1
Left
Left analog input to drive Class-D amplifier
2
GND
Ground
X14 RCA Jack
1
Right
Right analog input to drive Class-D amplifier
2
GND
Ground
2.1.1 PCB switch settings
PCB switch S1 and S5 are incorporated to select between the I2C addresses.
I2C address select
S5
S1
address
0
0
D8
0
1
DA
1
0
DC
1
1
DE
S2, S3 and S4 are incorporated to power-down respectively the 1.8V LDO, the DCDC
converter and the ADC converter if required. The LDO and the DCDC converter must be
turned on to operate the TFA9879. The ADC might be turned off when not used.
2.1.2 Digital input formats
Below digital formats are supported by the TFA9879 device:
I2S formats (fs = 8kHz to 96kHz)
•
Philips standard I2S
•
Japanese I2S MSB-justified
•
Sony I2S LSB-justified
PCM/IOM2 formats (fs = 8kHz)
•
Long frame sync
•
Short frame sync
