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BH1415F
Audio ICs
Wireless Audio Link IC
BH1415F
The BH1415F 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.
!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 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 data input (CE, CK, DA) by serial input.
!Absolute maximum ratings (Ta = 25C, In measurement circuit.)
Parameter Supply voltage Symbol VCC Limits +7.0 -0.3 to VCC+0.3 -0.3 to VCC+0.3 450
Unit V V V mW Pin8,12
Conditions
Data input voltage Phase comparator output voltage
Power dissipation Storage temperature
VIN-D VOUT-P
Pd Tstg
Pin15,16,17,18 Pin7
-55 to +125
C
Derating : 4.5mW/C for operation above Ta=25C.
!Recommended operating conditions (Ta = 25C)
Parameter Operating supply voltage Symbol VCC Min. 4.0 -40 - 20 - 70 0.8VCC GND Typ. - - - - - - - - Max. 6.0 +85 -10 15k 155 120 VCC 0.2VCC Unit V C dBV Hz sec 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 Control terminal "H" level input voltage Control terminal "L" level input voltage
Topr
VIN-A
fIN-A t PRE fTX VIH VIL
1/3
Audio ICs
!Block diagram
22
1
R-ch INPUT
21 2
+ - - +
L-ch INPUT PRE-EMPHASIS TIME CONSTANT LPF TIME CONSTANT PILOT SIGNAL ADJUST AUDIO MUTING
PRE-EMPHASIS TIME CONSTANT
20 3
LPF LPF
Pre-emphasis and Limiter
LPF TIME CONSTANT
19
VCC 2
4
MPX
FILTER
18 5 +
MUTE
COMPOSITE SIGNAL OUTPUT
6 7
1 2 Phase detector VCC GND
17
GND PLL PHASE DETECTOR OUTPUT
8
1 19
DATA
16
Shift register
CLOCK
15
VCC
9
OSC
CHIP ENABLE
1 50
14
RF OSCILLATOR
10
RF
X'tal OSCILLATOR
13
1 4
Program counter
RF GND
RF GND
11
X'tal OSCILLATOR
12
PLL VCC
RF OUTPUT
PLL VCC
BH1415F
2/3
BH1415F
Audio ICs
No.
Control unit / Data
Contents
(2)
MULTIPLEXER
* It changes a stereo and monaural operation. MONO 0 1 Condition of the composite signal Monaural operation L+R , Pilot OFF Stereo operation s L+R+(L-R),sinst+Psin 2 t
MONO
(2)
PHASE DETECTOR
* It controls charge pump output by the phase comparator compulsorily. PD0 0 0 1 1 PD1 0 1 0 1 Charge pump output Usual operation Compulsion by Low Compulsion by High High impedance
PD0, PD1
(3)
TEST MODE
* It is data for the LSI test. * Always in T0 Input "1".
T0, T1
* Always in T1 Input "0".
!External dimensions (Units : mm)
13.6 0.2 22 12
7.8 0.3
5.4 0.2
1.8 0.1
1
11
0.11
1.27
0.4 0.1
0.3Min. 0.15
SOP22
0.15 0.1
3/3
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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