si4704 Silicon Laboratories, si4704 Datasheet - Page 16

• Manufacturer Part Number: si4704
• Description: Broadcast Fm Radio Receiver For Consumer Electronics
• Manufacturer: Silicon Laboratories

Si4704/05-C40
2. Typical Application Schematic
Notes:
16
1. Place C1 close to V
2. All grounds connect directly to GND plane on PCB.
3. Pins 1 and 20 are no connects, leave floating.
4. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Si47xx Antenna, Schematic,
5. Pin 2 or Pin 4 connects to the FM antenna interface. Pin 2 is for a headphone antenna. Pin 4 is for an integrated
6. Place Si4704/05 as close as possible to antenna and keep the FMI and LPI traces as short as possible.
Layout, and Design Guidelines” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
antenna.
RCLK
SCLK
SDIO
1.85 to 3.6 V
RST
SEN
VIO
FMI
LPI
DD
pin.
1
2
3
4
5
RFGND
LPI
RST
FMI
NC
Si4704/05
U1
Rev. 1.0
DOUT
ROUT
LOUT
GND
VDD
GPO3
15
14
13
12
11
Optional: for crystal oscillator option
R1
R2
Optional: Digital Audio Output
R3
C1
LOUT
ROUT
C2
GPO1
GPO2/INT
GPO3/DCLK
DFS
DOUT
X1
VBATTERY
2.7 to 5.5 V
C3
RCLK