Version 1.0
Samsung Electronics
page 3 of 8
3.4 Transmit Mode
In transmit mode, the audio engine controlled I2S, transforms the audio data into packetized digital IQ
signals. These are in turn pulse-shaped before conversion by a 10 bits 44Msps DAC to match to the analog
IQ inputs of the radio IC. The radio IC has programmable baseband filters to lower the RF spectrum side
lobes and to suppress the DAC image and the DAC spurious. The output power is programmable. A power
detector (PD_out) on the radio IC enables close-loop TX power control. The differential RF PA outputs are
connected via a balun and low pass filter to a transmit/receive switch with TX diversity option to the
antenna outputs.
4. Pin description
Pin Number
Pin Name
I/O
Description
1
5V
PWR
Regulated 4.7V to 5.2V input
2
5V
PWR
Regulated 4.7V to 5.2V input
3 GPIO_4
I/O
PWM
RESET
4 GND
GND
GND
5 I
2
C_SCL_SLV I/O I
2
C serial clock Slave
6 I
2
C_SDA_SLV I/O I
2
C serial data Slave
7 /RESET(DARR_RST)
I Reset
Darr83
8
MCLK
I/O
12.288MHz audio clock I/O
9 GND
GND
Ground
10 BCK_X
I/O
I
2
S port X Bit Clock
11 GPIO_7
I/O
POWER_CTL
12 LRCK_X
I/O
I
2
S port X Left Right Clock
13
MON_TXD
I/O
Serial Async Data, for test purposes
14 SDIO_X(DATA1)
I/O
I
2
S port X serial data
15 GND
GND
GND
16 SDIO_W(DATA0)
I/O
I
2
S port W serial data
17 GPIO_3
I/O
Normal
GPIO
18 BCK_W
I/O
I
2
S port W Bit Clock
19 GPIO_23
I/O
Red
LED
20 LRCK_W
I/O
I
2
S port W Left Right Clock
21 GND
GND
Ground
22 GND
GND
Ground