bh1415sf
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.
zApplications
CD changer, Car TV, Car navigation, Wireless speakers, Personal computer (sound board), Game machine
zFeatures
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.
zAbsolute maximum ratings (Ta = 25°C, In measurement circuit.)
Parameter
Symbol
Limits
Unit
Conditions
Supply voltage
Vcc
+7.0
V
Pin8,12
Data input voltage
VIN-D
−0.3~Vcc+0.3
V
Pin15,16,17,18
VOUT-P
−0.3~Vcc+0.3
V
Pin7
Phase comparator output voltage
Power dissipation
BH1415S
BH1415F
Storage temperature
1000
450
−55~+125
Pd
Tstg
∗1
∗2
mW
˚C
*1 Derating : 10mW/˚C for operation above Ta=25˚C.
*2 Derating : 4.5mW/˚C for operation above Ta=25˚C.
zRecommended operating conditions (Ta=25°C)
Symbol
Min.
Typ.
Max.
Unit
Operating supply voltage
Vcc
4.0
−
6.0
V
Operating temperature
Topr
−4.0
−
+85
°C
Audio input level
VIN-A
−
−
−10
dBV
Pin1,22
Audio input frequency band
fIN-A
20
−
15k
Hz
Pin1,22
Pre-emphasis time constant set up range
τ PRE
−
−
155
µsec
Pin2,21
Transmission frequency
fTX
70
−
120
MHz
Pin9,11
Control terminal "H" level input voltage
VIH
0.8Vcc
−
Vcc
V
Pin15,16,17,18
Control terminal "L" level input voltage
VIL
GND
−
0.2Vcc
V
Pin15,16,17,18
Parameter
Conditions
Pin8,12
1
2
3
4
5
6
7
8
9
10
11
R-ch INPUT
PRE-EMPHASIS TIME CONSTANT
LPF TIME CONSTANT
FILTER
COMPOSITE SIGNAL OUTPUT
GND
PLL PHASE DETECTOR OUTPUT
VCC
RF OSCILLATOR
RF GND
RF OUTPUT
PRE-EMPHASIS TIME CONSTANT
LPF TIME CONSTANT
PILOT SIGNAL ADJUST
AUDIO MUTING
DATA
CLOCK
CHIP ENABLE
X'tal OSCILLATOR
X'tal OSCILLATOR
22
21
20
19
18
17
16
15
14
13
Pre-emphasis
and Limiter
+
−
MPX
VCC
2
1
50
+
LPF
1
2
Phase
detector
+
OSC
GND
VCC
PLL VCC
L-ch INPUT
BH1415S / BH1415F
Audio ICs
zBlock diagram
PLL VCC
12
−
Shift register
LPF
MUTE
1
4
1
19
Program counter
RF
RF GND
BH1415S / BH1415F
Audio ICs
zPin descriptions
1
R-ch audio source input terminal
8
1
2 Vcc
43k
It cuts DC with the capacitor and it inputs R-ch
audio signal.
22
1
2 Vcc
L-ch audio source input terminal
22.7k
1k
1 22
or
It cuts DC with the capacitor and it inputs L-ch
audio signal.
2,21
Pre-emphasis time constant terminal
6
50p
8
100k
LPF time constant terminal
1
2 Vcc
2 21
or
It connects a capacitor for the time constant of
pre-emphasis.
τ = 22.7kΩ × C
3,20
DC
(V)
Equivalent circuit
Pin descriptions
Pin No.
This is 15kHz LPF.
It connects a 150pF capacitor.
100k
100k
-
1
+
2 Vcc
1
2 Vcc
6
3 20
or
Filter terminal
8
50k
4
It is a ripple filter for the reference voltage of the
audio part.
50k
1
2 Vcc
6
4
5
Composite signal output terminal
It connects to the FM modulator.
8
1
2 Vcc
5
6
6
GND
7
PLL phase detector output terminal
It connects to the PLL LPF circuit.
−
GND
8
−
7
6
8
Power supply terminal
−
Vcc
BH1415S / BH1415F
Audio ICs
8
This is the base terminal of the colpitts oscillator.
It connects time constant of the oscillation.
18p
RF oscillator terminal
25k
9
DC
(V)
Equivalent circuit
Pin descriptions
Pin No.
4
7 Vcc
2p
9
40k
30p
10
10
RF GND
11
RF transmission output terminal
−
GND
8
It connects to the antenna through BPF.
Vcc
-1.9
11
10
12
13,14
−
PLL power supply terminal
X'tal oscillator terminal
Vcc
12
It connects a 7.6MHz crystal oscillator.
4k
13
14
−
1M
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
−
15 16 17 18
or or or
6
Audio mute terminal
0.8Vcc ≤ Pin18 : Mute ON
0.2Vcc ≥ Pin18 : Mute OFF
19
Pilot signal adjust terminal
8
19
6
5k
1
2 Vcc
BH1415S / BH1415F
Audio ICs
zElectrical characteristics (Unless otherwise noted Ta = 25°C, VCC=5.0V, Signal source : fIN=400Hz)
Parameter
Symbol
Min.
Typ.
Max.
Unit
IQ
14
20
28
mA
Channel separation
Sep
25
40
−
dB
Total harmonic distortion
THD
−
0.1
0.3
%
Channel balance
C.B
−2
0
+2
dB
Input output gain
Gv
−2
0
+2
dB
MP
12
15
18
%
SCR
−
−30
−20
dB
Quiescent current
Pilot modulation rate
Sub carrier rejection ratio
Pre-emphasis time constant
Limiter input level
τ PRE
40
50
60
µsec
VIN(LIM)
−16
−13
−10
dBV
Conditions
Measurement
circuit
Fig.1
VIN=−20dBV
L→R,R→L
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
Fig.2
Fig.3
Fig.2
Fig.3
Fig.3
Fig.3
Fig.3
Fig.4
VO=−3dB
Pin2,21Open
VIN=−20dBV
L+R
Fig.5
fTX=100MHz
Fig.6
fC(LPF)
12
15
18
kHz
Mute attenuation volume
VO(MUTE)
−
−48
−42
dB
Transmission output level
VTX
97
100
103
dBµV
"H" level input current
IIH
−
−
1.0
µA
Pin15,16,17,18 VIN=5V
Fig.7
"L" level input current
IIL
−1.0
−
−
µA
Pin15,16,17,18 VIN=0V
Fig.7
"H" level output voltage
VOH
Vcc1.0
Vcc0.15
−
V
Pin7 IOUT=−1.0mA
Fig.7
"L" level output voltage
VOL
−
0.15
1.0
V
Pin7 IOUT=1.0mA
Fig.7
"off" level leak current1
IOFF1
−
−
100
nA
Pin7 VOUT=5V
Fig.8
"off" level leak current2
IOFF2
−100
−
−
nA
Pin7 VOUT=GND
Fig.8
LPF cut off frequency
Fig.3
BH1415S / BH1415F
Audio ICs
zMeasurement circuits
Quiescent current
22
21
20
19
18
17
16
15
14
0.01µ
27p
27p
Chip enable
Clock
Data
Muting
150p
2200p
7.6MHz
13
12
PLL VCC
Shift register
−
LPF
+
Pre-emphasis
and Limiter
1
50
MPX
1
19
1
2
+
LPF
−
Program counter
Phase
detector
VCC
2
OSC
+
VCC
GND
1
2
3
4
5
6
7
10µ
150p
0.01µ
2200p
1
4
MUTE
100µ
IQ
A
+5V
Fig.1
8
RF
RF GND
9
10
11
BH1415S / BH1415F
Audio ICs
Channel separation
Channel balance
L-ch
22
21
20
19
18
17
16
15
14
0.01µ
27p
27p
Chip enable
Clock
Data
Muting
470p
10µ
150p
2200p
7.6MHz
13
12
PLL VCC
Shift register
−
LPF
+
Pre-emphasis
and Limiter
1
50
MPX
LPF
−
1
19
1
2
+
fIN = 400Hz
VIN = -20dBV
1
4
MUTE
Program counter
Phase
detector
OSC
+
VCC
2
VCC
GND
4
5
6
7
RF GND
9
10k
100µ
Stereo signal demodulator
L-ch
8
0.01µ
10µ
3
10µ
2
150p
10µ
1
2200p
R-ch
V
~
V
~
Sep, C.B
Fig.2
R-ch
RF
+5V
10
11
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
22
L-ch
21
20
19
18
17
16
0.01µ
27p
27p
7.6MHz
Chip enable
Clock
Data
470p
10µ
+
150p
2200p
0V→5V (Mute ON)
15
14
13
12
PLL VCC
Shift register
−
LPF
+
Pre-emphasis
and Limiter
1
50
MPX
LPF
−
IN
1
19
1
2
+
~ Vf =400Hz
=−20dBV
IN
Program counter
Phase
detector
OSC
+
VCC
2
VCC
GND
1
2
3
4
5
10µ
R-ch
10µ
+
6
7
9
0.01µ
+
100µ
10k
10µ
150p
+
SCR
IHF BPF
200Hz~15kHz
G V , MP
τ PRE
THD, VO(MUTE)
Output response (dB)
0
-10
SCR
-20
-30
-40
-50
-60
0
10k
20k
30k
40k
50k
Frequency (Hz)
Fig.3
RF
RF GND
8
+
2200p
Spectrum
analyzer
1
4
MUTE
+5V
10
11
BH1415S / BH1415F
Audio ICs
Limiter input level
22
L-ch
21
20
19
18
17
16
0.01µ
27p
27p
Chip enable
Clock
Data
Muting
470p
10µ
+
150p
2200p
7.6MHz
15
14
13
12
PLL VCC
Shift register
−
LPF
+
Pre-emphasis
and Limiter
1
50
MPX
LPF
−
IN
1
19
1
2
+
~ f =400Hz
Program counter
Phase
detector
OSC
+
VCC
2
VCC
GND
R-ch
2
3
4
5
10µ
1
6
7
9
0.01µ
+
100µ
10k
10µ
+
+5V
Output level (dBV)
VIN (LIM)
1dB
Input level (dBV)
VIN(LIM)
Fig.4
RF
RF GND
8
+
150p
2200p
10µ
+
1
4
MUTE
10
11
BH1415S / BH1415F
Audio ICs
LPF cut off frequency
L-ch
22
21
20
19
18
17
16
0.01µ
27p
27p
Chip enable
Clock
Data
Muting
150p
10µ
+
470p
7.6MHz
15
14
13
12
PLL VCC
Shift register
−
LPF
+
Pre-emphasis
and Limiter
1
50
MPX
LPF
−
IN
1
19
1
2
+
~ Vf =400Hz
=−20dBV
IN
Program counter
Phase
detector
OSC
+
VCC
2
VCC
GND
2
3
4
5
10µ
10µ
+
6
7
RF GND
8
9
10
11
0.01µ
+
10µ
150p
+
+
100µ
+5V
fC (LPF)
Output response (dB)
1
RF
10k
R-ch
1
4
MUTE
3dB
Frequency (Hz)
fC(LPF)
Fig.5
BH1415S / BH1415F
Audio ICs
Transmission output level
22
21
20
19
18
17
16
0.01µ
27p
27p
Chip enable
Clock
Data
Muting
7.6MHz
15
14
13
12
PLL VCC
Shift register
−
LPF
1
50
MPX
1
19
1
2
+
LPF
Program counter
Phase
detector
OSC
+
VCC
GND
3
4
5
6
7
RF GND
8
9
10
11
0.01µ
1000p
10p
+
33p
KV-1471E
(TOKO)
0.047µ
100
+5V
Fig.6
33µ
+
VTX
Spectrum
analyzer
Zin=50Ω
fTX=100MHz
10k
5.1k
FEM10C-3F6
(SUMIDA)
+
100µ
20k
2
10µ
1
RF
10k
1000p
VCC
2
2SC2062S
(ROHM)
−
1
4
MUTE
22p
+
Pre-emphasis
and Limiter
BH1415S / BH1415F
Audio ICs
“H” level input current
“L” level input current
“H” level output voltage
“L” level output voltage
A
0V, 5V
IIH, IIL
22
21
20
19
18
17
16
0.01µ
27p
27p
Chip enable
Clock
Data
Muting
7.6MHz
15
14
13
12
PLL VCC
Shift register
−
LPF
+
Pre-emphasis
and Limiter
1
50
MPX
1
19
1
2
+
LPF
−
Program counter
Phase
detector
VCC
2
OSC
+
VCC
GND
1
2
3
4
5
6
7
9
+
100µ
V
VOH
1mA
VOL
1mA
+5V
Fig.7
RF
RF GND
8
0.01µ
VOH, VOL
1
4
MUTE
10
11
BH1415S / BH1415F
Audio ICs
“off ” level leak input current
22
21
20
19
18
17
16
0.01µ
27p
27p
Chip enable
Clock
Data
Muting
7.6MHz
15
14
13
12
PLL VCC
Shift register
−
LPF
+
Pre-emphasis
and Limiter
1
50
MPX
1
19
1
2
+
LPF
−
Program counter
Phase
detector
VCC
2
OSC
+
VCC
GND
1
2
3
4
1
4
MUTE
5
6
7
RF GND
8
9
0.01µ
+
100µ
IOFF1, IOFF2
A
0V, 5V
+5V
Fig.8
RF
10
11
BH1415S / BH1415F
Audio ICs
zCircuit operations
Input of the serial data
t1, t2, t3, t4 ≥ 1.5µsec
t5 < 1.5µsec (X'tal : 7.6MHZ)
t1
t2
t3
t4
t5
CE
CK
D1
D0
DA
D2
D3
D4
PD1
T0
T1
Internal data
· It is a binary value.
It sets D10 with MSB and it sets D0 with LSB.
Example In case of 99.7MHz oscillation
99.7MHZ ÷ 100kHZ(fref) = 997 → 3E5(HEX)
0
1
0
0
1
1
1
1
1
D6
D7
D8
D9
LSB
0
D10
1
D5
3
D4
E
D3
5
D2
D0 ~ D10
· It is the data which sets the program counter number of the dividing.This data can
set a transmission frequency.
D1
PROGRAM COUNTER
Contents
D0
(1)
Control unit / Data
T1
(4) TEST
Explanation of the serial data
No.
T0
PD1
(3) PD-CTL
(2) OM-CTL
PD0
MONO
D10
D9
D8
D7
D6
(1) PR-CTL
D5
D4
D3
D2
D1
DA
D0
Composition of the serial data
MSB
BH1415S / BH1415F
Audio ICs
No.
Control unit / Data
(2)
Contents
• It changes a stereo and monaural operation.
MULTIPLEXER
MONO
MONO
PD0, PD1
Monaural operation L+R , Pilot OFF
1
Stereo operation
ωs
L+R+(L-R),sinωst+Psin 2 t
Charge pump output
PD0
PD1
0
0
Usual operation
0
1
Compulsion by Low
1
0
Compulsion by High
1
1
High impedance
• It is data for the LSI test.
TEST MODE
(3)
0
• It controls charge pump output by the phase comparator compulsorily.
PHASE DETECTOR
(2)
Condition of the composite signal
• Always in T0 Input "1".
T0, T1
• Always in T1 Input "0".
zExternal dimensions (Units : mm)
BH1415S
BH1415F
13.6 ± 0.2
7.8 ± 0.3
1.8 ± 0.1
7.62
1
0.15 ± 0.1
11
12
5.4 ± 0.2
1
22
0.11
12
6.5 ± 0.3
0.51Min.
3.4 ± 0.2 3.95 ± 0.3
19.4 ± 0.3
22
11
1.27
0.4 ± 0.1
0.3Min.
0.3 ± 0.1
1.778
0.5 ± 0.1
SDIP22
0.15
0° ~ 15°
SOP22
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