BH1417F
Multimedia ICs
Wireless Audio Link IC
BH1417F
The BH1417F is a FM stereo transmitter IC that transmits simple configuration. The IC consists of a stereo modulator for
generating stereo composite signals and a FM transmitter for broadcasting a FM signal on the air. The stereo modulator
generates a composite signal which consists of the MAIN, SUB, and pilot signal from a 38kHz oscillator.
The FM transmitter radiates FM wave on the air by modulating the carrier signal with a composite signal.
Frequency is set for North America.
!
Applications
Wireless speakers, Personal computer(sound board), Game machine, CD changer, Car TV, Car navigation
!
Features
1) It is possible to improve the timbre because it has the pre-emphasis circuit, limiter circuit, and the low-pass filter circuit.
2) Built-in pilot-tone system FM stereo modulator circuit.
3) The transmission frequency is stable because it has a PLL system FM transmitter circuit.
4) PLL controls data input in parallel (4bits, 14ch for North America).
!
Absolute maximum ratings
(Ta = 25°C, In measurement circuit.)
Parameter
Supply voltage
Symbol
V
CC
Limits
+7.0
−0.3
to V
CC
+0.3
−0.3
to V
CC
+0.3
450
∗
Unit
V
V
V
mW
Pin8,12
Conditions
Date input voltage
Phase comparator output voltage
Power dissipation
Storage temperature
V
IN-D
V
OUT-P
Pd
Tstg
Pin15,16,17,18
Pin7
−55
to
+125
°
C
∗
Derating : 4.5mW/°C for operation above Ta=25°C.
!
Recommended operating conditions
(Ta = 25°C)
Parameter
Operating supply voltage
Symbol
V
CC
Min.
4.0
−40
−
20
−
87.7
106.7
0.8V
CC
GND
Typ.
−
−
−
−
−
−
−
−
Max.
6.0
+85
−10
15k
155
88.9
107.9
V
CC
0.2V
CC
Unit
V
°C
dBV
Hz
µs
MHz
V
V
Pin1,22
Pin1,22
Pin2,21
Pin9,11
Pin15,16,17,18
Pin15,16,17,18
Conditions
Pin8,12
Operating temperature
Audio input level
Audio input frequency band
Pre-emphasis time constant set up range
Transmission frequency(200kHz step)
Control terminal "H" level input voltage
Control terminal "L" level input voltage
Topr
V
IN-A
f
IN-A
τ
PRE
f
TX
V
IH
V
IL
1/2
ROHM [ ROHM ]
