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BH1415S / BH1415F
Audio ICs
Wireless Audio Link IC
BH1415S / BH1415F
The BH1415S/F are FM stereo transmitter ICs that transmit simple configuration. The ICs consist 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~Vcc+0.3 -0.3~Vcc+0.3 1000 450 -55~+125 1 2 Unit V V V mW C
Conditions
Pin8,12 Pin15,16,17,18 Pin7
Data input voltage Phase comparator output voltage
Power dissipation Storage temperature BH1415S BH1415F
VIN-D VOUT-P
Pd Tstg
*1 Derating : 10mW/C for operation above Ta=25C. *2 Derating : 4.5mW/C for operation above Ta=25C.
Recommended operating conditions (Ta=25C)
Parameter Operating supply voltage Symbol Vcc Min. 4.0 -4.0 - 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 PRE fTX VIH VIL
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 DATA
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
17 6 7
1 2 Phase detector VCC GND
GND PLL PHASE DETECTOR OUTPUT
8
1 50 1 19
16
Shift register
CLOCK
15
VCC
9
OSC
CHIP ENABLE
14
RF OSCILLATOR
10
RF
X'tal OSCILLATOR
13
1 4
Program counter
RF GND
RF GND
11
X'tal OSCILLATOR
12
PLL VCC
BH1415S / BH1415F
RF OUTPUT
PLL VCC
BH1415S / BH1415F
Audio ICs
Pin descriptions
Pin No. 1 Pin descriptions R-ch audio source input terminal
8
Equivalent circuit
DC (V)
43k
It cuts DC with the capacitor and it inputs R-ch audio signal. 22 L-ch audio source input terminal It cuts DC with the capacitor and it inputs L-ch audio signal. 2,21 Pre-emphasis time constant terminal It connects a capacitor for the time constant of pre-emphasis. = 22.7k x C
6
1 2 Vcc
1 2 Vcc
22.7k
1k
1 22 or
2 21 or
1 2 Vcc
3,20
LPF time constant terminal This is 15kHz LPF. It connects a 150pF capacitor.
8
100k
100k
100k 1 + 2 Vcc
-
50p
1 2 Vcc
6 3 20 or
4
Filter terminal It is a ripple filter for the reference voltage of the audio part.
8
50k
6 4
5
Composite signal output terminal It connects to the FM modulator.
8
50k
1 2 Vcc
5
1 2 Vcc
6
6 7
GND PLL phase detector output terminal It connects to the PLL LPF circuit.
8
-
GND
7
-
6
8
Power supply terminal
-
Vcc
BH1415S / BH1415F
Audio ICs
Pin No. 9 Pin descriptions RF oscillator terminal This is the base terminal of the colpitts oscillator. It connects time constant of the oscillation.
9 30p
40k
Equivalent circuit
8
25k
DC (V)
18p
2p
4 7 Vcc
10
10 11
RF GND
RF transmission output terminal It connects to the antenna through BPF.
11 8
-
GND
Vcc -1.9
10
12 13,14
PLL power supply terminal X'tal oscillator terminal It connects a 7.6MHz crystal oscillator.
12
-
Vcc
4k 14 1M 13
-
6
15
Chip enable terminal The terminal to make high level in serial data input.
16
Clock input terminal
12
The clock which takes data and synchronization in serial data input. 17 Data input terminal The input terminal of the serial data which is forwarded from the controller 18 Audio mute terminal 0.8Vcc Pin18 : Mute ON 0.2Vcc Pin18 : Mute OFF 19 Pilot signal adjust terminal
8 15 16 17 18 or or or
-
6
19
5k
1 2 Vcc
6
BH1415S / BH1415F
Audio ICs
Electrical characteristics (Unless otherwise noted Ta = 25C, VCC=5.0V, Signal source : fIN=400Hz)
Parameter Symbol IQ Sep THD C.B Gv MP Min. 14 25 - Typ. 20 40 Max. 28 - Unit mA dB VIN=-20dBV LR,RL VIN=-20dBV L+R VIN=-20dBV L+R VIN=-20dBV L+R VIN=-20dBV,L+R Pin5 VIN=-20dBV L+R VIN=-20dBV L+R Output level at 1dB gain compression VO=-3dB Pin2,21Open VIN=-20dBV L+R fTX=100MHz Conditions Measurement circuit Fig.1 Fig.2 Fig.3 Fig.2 Fig.3 Fig.3 Fig.3 Fig.3 Fig.4 Fig.5 Fig.3 Fig.6 Fig.7 Fig.7 Fig.7 Fig.7 Fig.8 Fig.8
Quiescent current
Channel separation Total harmonic distortion Channel balance Input output gain Pilot modulation rate Sub carrier rejection ratio Pre-emphasis time constant Limiter input level LPF cut off frequency Mute attenuation volume Transmission output level "H" level input current "L" level input current "H" level output voltage "L" level output voltage "off" level leak current1 "off" level leak current2
0.1 0 0 15 -30 50 -13 15 -48 100
- -
0.3 +2 +2 18 -20 60 -10 18 -42 103 1.0
- -
%
dB dB
-2 -2 12
-
%
dB
SCR
PRE
40 -16 12
-
sec
dBV kHz dB dBV A A V V nA nA
VIN(LIM) fC(LPF) VO(MUTE) VTX IIH IIL VOH VOL IOFF1 IOFF2
97
-
Pin15,16,17,18 VIN=5V Pin15,16,17,18 VIN=0V Pin7 IOUT=-1.0mA Pin7 IOUT=1.0mA Pin7 VOUT=5V Pin7 VOUT=GND
-1.0 Vcc1.0
- -
Vcc0.15 0.15
- -
1.0 100
-
-100
BH1415S / BH1415F
Audio ICs
Measurement circuits Quiescent current
7.6MHz
Chip enable
27p
27p
2200p
150p
Muting
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter + - LPF
Phase detector VCC 2
Program counter
OSC RF
+
GND VCC
RF GND
1
2200p
2
3
4
5
6
7
0.01
8
9
10
11
150p
10
100
IQ
A
+5V
Fig.1
0.01
BH1415S / BH1415F
Audio ICs
Channel separation Channel balance
7.6MHz
Chip enable
27p
27p
150p
470p
10
2200p
Muting
L-ch
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter
fIN = 400Hz VIN = -20dBV
+ - LPF
Phase detector VCC 2
Program counter
OSC RF
+
GND VCC
RF GND
R-ch 10
1
2200p
2
3
4
10
5
6
7
0.01
8
9
10
11
150p
10
10k
100
Stereo signal demodulator
L-ch
+5V
V ~
Sep, C.B
V ~
R-ch
Fig.2
0.01
BH1415S / BH1415F
Audio ICs
Total harmonic distortion Input output gain Pilot index of modulation Sub carrier rejection ratio Pre-emphasis time constant Mute attenuation volume
0V5V (Mute ON) 7.6MHz
150p
470p
27p
Chip enable
27p
10 +
2200p
L-ch
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter + fIN=400Hz ~ VIN=-20dBV - LPF
Phase detector VCC 2 R-ch
Program counter
OSC RF
+
GND VCC
RF GND
1
2
3
4
10
5
+
6
7
0.01 +
8
9
10
11
10 +
2200p
150p
10
+ 100
10k
Spectrum analyzer SCR
GV, MP PRE
IHF BPF 200Hz~15kHz
+5V
THD, VO(MUTE)
0 -10 SCR -20 -30 -40 -50 -60
Output response (dB)
0
10k
20k
30k
40k
50k
Frequency (Hz)
Fig.3
0.01
BH1415S / BH1415F
Audio ICs
Limiter input level
7.6MHz
150p
470p
27p
Chip enable
27p
10 +
2200p
Muting
L-ch
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter +
~ fIN=400Hz
-
LPF
Phase detector VCC 2 R-ch
Program counter
OSC RF
+
GND VCC
RF GND
1
2
3
4
10
5
+
6
7
0.01 +
8
9
10
11
10 +
2200p
150p
10
+ 100
10k
+5V VIN (LIM)
Output level (dBV)
1dB
Input level (dBV) VIN(LIM)
Fig.4
0.01
BH1415S / BH1415F
Audio ICs
LPF cut off frequency
7.6MHz
150p
470p
27p
Chip enable
27p
10 +
Muting
L-ch
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter + fIN=400Hz ~ VIN=-20dBV - LPF
Phase detector VCC 2 R-ch
Program counter
OSC RF
+
GND VCC
RF GND
1
2
3
4
10
5
+
6
7
0.01 +
8
9
10
11
10 +
150p
10
+ 100
10k
+5V fC (LPF)
Output response (dB)
0.01
3dB
Frequency (Hz) fC(LPF)
Fig.5
BH1415S / BH1415F
Audio ICs
Transmission output level
7.6MHz
27p
Chip enable
27p
Muting
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter + - LPF
Phase detector VCC 2
Program counter
OSC RF
+
GND VCC
RF GND
1
2
3
+
4
5
6
7
0.01
8
10p
9
10
11
1000p VTX Spectrum analyzer Zin=50 fTX=100MHz 10k
10
+
FEM10C-3F6 (SUMIDA)
100
20k
22p
0.047
100
33 +
5.1k
10k
2SC2062S (ROHM)
+5V
Fig.6
1000p
KV-1471E (TOKO)
33p
0.01
BH1415S / BH1415F
Audio ICs
"H" level input current "L" level input current "H" level output voltage "L" level output voltage
0V, 5V
A
IIH, IIL
7.6MHz
27p
Chip enable
27p
Muting
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter + - LPF
Phase detector VCC 2
Program counter
OSC RF
+
GND VCC
RF GND
1
2
3
4
5
6
7
0.01
8
9
10
11
+ 100
VOH, VOL
V
VOH 1mA VOL 1mA
+5V
Fig.7
0.01
BH1415S / BH1415F
Audio ICs
"off " level leak input current
7.6MHz
27p
Chip enable
27p
Muting
22
21
20
19
18
17
Clock
Data
16
15
14
13
12
PLL VCC
Shift register
- + LPF MPX 1 50 MUTE 1 2 1 19 1 4
Pre-emphasis and Limiter + - LPF
Phase detector VCC 2
Program counter
OSC RF
+
GND VCC
RF GND
1
2
3
4
5
6
7
0.01
8
9
10
11
+ 100
IOFF1, IOFF2
A
0V, 5V +5V
Fig.8
0.01
BH1415S / BH1415F
Audio ICs
Circuit operations Input of the serial data
t1, t2, t3, t4 1.5sec t5 < 1.5sec (X'tal : 7.6MHZ) t1 t2 t3 t4 t5
CE
CK
DA
D0
D1
D2
D3
D4
PD1
T0
T1
Internal data
Composition of the serial data
MONO PD0 D10 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9
DA
PD1
T0 (4) TEST
(2) OM-CTL
(1) PR-CTL
Explanation of the serial data
No. Control unit / Data Contents
(1)
PROGRAM COUNTER
* It is the data which sets the program counter number of the dividing.This data can set a transmission frequency. * It is a binary value. It sets D10 with MSB and it sets D0 with LSB.
D0 ~ D10
Example In case of 99.7MHz oscillation 99.7MHZ / 100kHZ(fref) = 997 3E5(HEX) 5 1 0 1 0 0 1 E 1 1 1 3 1 0
(3) PD-CTL
LSB
MSB
D10
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
T1
BH1415S / 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)
BH1415S
19.4 0.3 22 12
22
BH1415F
13.6 0.2 12
6.5 0.3
7.8 0.3
0.51Min.
5.4 0.2
3.4 0.2 3.95 0.3
1
11
7.62
1.8 0.1 0.11
1
11
1.27
0.4 0.1
0.3Min. 0.15
0.3 0.1
1.778 0.5 0.1 0 ~ 15
SDIP22
SOP22
0.15 0.1

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