BH1414F.PDF

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BH1414K
BH1414K
Multimedia ICs
Wireless Audio Link IC
BH1414K
The BH1414K is a FM stereo transmitter IC that uses a simple configuration. This IC consists of a stereo modulator for
generating stereo composite signals and a FM transmitter for broadcasting a FM signal on the air. A high S/N ratio and
good timbre transmitter circuit can be composed with a few components. It is available for many applications due to the
varieties of setting such as transmission output by serial data input.
Applications
CD changer, Car TV, Car navigation, Wireless speakers, Personal computer (sound board), Game machine
Features
1) It is possible to improve the timbre because it has the pre-emphasis circuit, limiter circuit, and the 19kHz/38kHz low-
pass trap filter circuit.
2) Built-in pilot-tone system FM stereo modulator circuit.
3) The transmission frequency is stable because it has a PLL system for the FM transmitter circuit.
4) PLL data input (CE, CK, DA) by serial input.
5) It is possible for input level setting, monaural operation and output ON/OFF control by serial input.
6) It is possible for the transmission output control.
Absolute maximum ratings (Ta = 25
°
C)
Parameter
Symbol
Limits
Unit
Supply voltage
V CC1
V CC2
Pd
Tstg
+ 9.0
+
V
Power dissipation
Storage temperature range
mW
°
−
55~
+
125
C
∗
Reduced by 5mW for each increase in Ta of 1
C over 25
°
C.
Recommended operating conditions (Ta = 25
°
C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Operating supply voltage
Operating temperature range
Audio input level
Audio input frequency
Transmission frequency
V CC
Topr
V IN-A
f IN-A
f TX
40
20
75
−
−
−
−
−
85
500
15k
110
C
mVrms
Hz
MHz
V
°
10.0
500
°
4.5
−
5.5
+
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BH1414K
Multimedia ICs
Block diagram
33
32
31
30
29
28
27
26
25
24
23
GND3
V CC 3
RF
RF OSC
X'tal OSCILLATOR
34
22
PLL LPF OUT
X'tal OSCILLATOR
35
Shift register
Program
countor
+−
REF
21
PLL LPF IN
V CC 2 (PLL)
36
V CC 2
1
19
Phase
detector
20
PLL PHASE DETECTOR OUTPUT
GND2 (PLL)
37
GND2
50
1
19
PILOT SIGNAL OUTPUT
GND1
38
GND1
MUTE
18
MPX OUTPUT
REF
REFERENCE
39
V CC
V CC 1
17
V CC 1
L-ch MPX INPUT
40
MPX
16
R-ch MPX INPUT
L-ch LPF OUTPUT
41
19k/38kHz LPF
LIMITER
LIMITER
19k/38kHz LPF
15
R-ch LPF OUTPUT
GIC7L
42
EVR
EVR
14
GIC7R
GIC6L
43
13
GIC6R
+−
−
+
GIC5L
44
REF
REF
12
GIC5R
1
2
3
4
5
6
7
8
9
10
11
4
1
1
2
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BH1414K
Multimedia ICs
Pin descriptions
Pin No.
Pin name
Equivalent circuit
Description
DC
voltage
(V)
1
2
3
4
42
43
44
1.3k
1.3k
330
LIMITER
41 15
or
L-ch LPF
time constant terminal
It connects resistor and
capacitor.
4 8
or
8
9
10
11
12
13
14
3 9
or
R-ch LPF
time constant terminal
2 10
or
It connects resistor and
capacitor.
+
+
−
−
−
−
1
+
+
V CC
2
15
R-ch LPF output and
LPF time constant
terminal
1 11
or
44 12
or
L-ch LPF output and
LPF time constant
terminal
43 13
or
41
42 14
or
17
5
L-ch
audio source input
terminal
It cuts DC with the capacitor
and it inputs L-ch audio
signal.
1
V CC
5 7
2
or
62k
7
R-ch
audio source input
terminal
It cuts DC with the capacitor
and it inputs R-ch audio
signal.
38
17
+
2 V CC
−
10k
6
Limiter level adjust
terminal
6
10k
It adjusts a limiter level by
the resistance.
1
V CC
2
38
1
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BH1414K
Multimedia ICs
Pin No.
Pin name
Equivalent circuit
Description
DC
voltage
(V)
17
16
R-ch MPX input
terminal
20k
1
16 40
V CC
or
2
40
L-ch MPX input
terminal
2 V CC
38
17
Power supply 1
terminal
V CC
17
MPX signal output
terminal
It connects to the FM
modulator.
1
V CC
18
18
2
−
0.7
38
17
Pilot signal output
terminal
It connects to the FM
modulator.
1
V CC
19
19
2
−
0.7
38
36
20
PLL phase detector
output terminal
20
It connects to the PLL LPF
circuit.
−
37
17
PLL LPF input
terminal
21
21
2 V CC
22
−
22
PLL LPF output
terminal
38
1
1
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BH1414K
Multimedia ICs
Pin No.
Pin name
Equivalent circuit
Description
DC
voltage
(V)
25
23
5
V CC
9
RF oscillator terminal
23
This is the colpitts oscillator.
It connects time constant of
the oscillation.
24
5
V CC
24
9
−
0.7
27
25
Power supply 3
terminal (RF)
V CC
28
25
It connects resistor and
capacitor.
3
V CC
26
RF adjust terminal
4
−
0.9
26
28
RF transmission output
terminal
It connects LC.
V CC
27
27
GND3 (RF)
GND
29
29
Port output terminal
−
37
30
Data input terminal
The input terminal of the
serial data which is forwarded
from the controller.
36
31
Clock input terminal
The clock which takes data
and synchronization in serial
data input.
30
31
32
33
−
or or or
32
Chip enable terminal
The terminal to make high
level in serial data input.
33
Audio mute terminal
37
0.8V CC 2
≤
Pin33 : Mute OFF
0.2V CC 2
≥
Pin33 : Mute ON
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