BH1414K.pdf

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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
V CC1
V CC2
Pd
Tstg
9.0
Supply voltage
V
10.0
500
Power dissipation
Storage temperature range
mW
°
55 to
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
4.5
5.5
V
40
85
500
15k
110
C
mVrms
Hz
MHz
−
20
75
1/3
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BH1414K
Multimedia ICs
Application example
56
TXOUT
GND
1000p
5
6
1
10
10k
OFF
ON
PORT
1000p
33
32
31
30
29
28
27
26
25
24
15p
23
470p
GND3
V CC 3
∗ 18p
RF
RF OSC
34
22
35
Shift register
Program
countor
+ −
REF
21
18p
100
V CC
36
V CC 2
1
19
Phase
detector
20
1
1
120k
330p
37
GND2
19
50
2
GND
20k
4.7
38
GND1
MUTE
18
20k
10k
REF
330
V CC
39
2
V CC 1
17
40
MPX
16
41
19k/38kHz LPF
LIMITER
LIMITER
19k/38kHz LPF
15
0.01
0.01
0.01
0.01
42
EVR
EVR
14
43
13
+ −
44
REF
REF
12
1
2
3
4
5
6
7
8
9
10
11
1k
1k
0.01
0.01
(620)
(620)
L-IN
GND
R-IN
The constant of the capacitor must be determined by the agreement with a crystal maker.
2/3
4
1
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BH1414K
Multimedia ICs
External dimensions (Units : mm)
14.0±0.3
10.0±0.2
33
23
34
22
44
12
1
11
0.15±0.1
0.8
0.35±0.1
0.15
QFP44
3/3
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Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0
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