Wireless Audio Link IC - Datasheet Catalog

Audio ICs
BH1415F
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 = 25°C, In measurement circuit.)
Parameter Symbol Limits Unit
Supply voltage
Data input voltage
Phase comparator output voltage
Power dissipation
Storage temperature
VCC
VIN-D
VOUT-P
Pd
Tstg
∗ Derating : 4.5mW/°C for operation above Ta=25°C.
+7.0 V
−0.3~VCC+0.3 V
−0.3~VCC+0.3 V
∗
450 mW
−55~+125 °C
Conditions
Pin8,12
Pin15,16,17,18
Pin7
•Recommended operating conditions (Ta = 25°C)
Parameter Symbol Min. Typ. Max. Unit
Operating supply voltage
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
VCC
Topr
VIN-A
fIN-A
t PRE
fTX
VIH
VIL
4.0
−40
−
20
−
70
0.8VCC
GND
− 6.0
− +85
− −10
− 15k
− 155
− 120
−
VCC
− 0.2VCC
V
°C
dBV
Hz
µsec
MHz
V
V
Conditions
Pin8,12
Pin1,22
Pin1,22
Pin2,21
Pin9,11
Pin15,16,17,18
Pin15,16,17,18

Audio ICs
BH1415F
•Block diagram
L-ch INPUT
PRE-EMPHASIS TIME CONSTANT
LPF TIME CONSTANT
PILOT SIGNAL ADJUST
AUDIO MUTING
DATA
CLOCK
CHIP ENABLE
X'tal OSCILLATOR
X'tal OSCILLATOR
PLL VCC
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
−
+
Pre-emphasis
and Limiter
+
−
LPF
LPF
VCC
2
MPX
+
MUTE
Shift register
GND
1
2
Phase
detector
VCC
1
50
1
19
Program counter
OSC
1
4
RF
RF GND
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

Audio ICs
BH1415F
•Pin descriptions
Pin No.
Pin descriptions
Equivalent circuit
DC
(V)
1
R-ch audio source input terminal
It cuts DC with the capacitor and it inputs R-ch
audio signal.
8
1
43k
1
2 VCC
22
L-ch audio source input terminal
It cuts DC with the capacitor and it inputs L-ch
audio signal.
22
1k
22.7k
2,21 Pre-emphasis time constant terminal
It connects a capacitor for the time constant of
pre-emphasis.
τ = 22.7kΩ × C
6
2 VCC 1
2
VCC
1
or
21
2
or
1
2 VCC
3,20 LPF time constant terminal
8
This is 15kHz LPF.
It connects a 150pF capacitor. 100k 100k
100k
50p
−
+
1
2 VCC
6
20 3
or
4 Filter terminal
8
It is a ripple filter for the reference voltage of the
audio part.
50k
50k
1
2 VCC
6
4
5
Composite signal output terminal
8
It connects to the FM modulator.
5
1
2 VCC
6
6
GND
−
GND
7
PLL phase detector output terminal
8
It connects to the PLL LPF circuit.
7
−
6
8
Power supply terminal
−
VCC

Audio ICs
BH1415F
Pin No.
Pin descriptions
Equivalent circuit
DC
(V)
9
RF oscillator terminal
8
This is the base terminal of the colpitts oscillator.
It connects time constant of the oscillation.
9
25k
18p
2p
4
7 VCC
40k
30p
10
10
RF GND
−
GND
11
RF transmission output terminal
8
It connects to the antenna through BPF.
11
VCC
−1.9
10
12
PLL power supply terminal
−
VCC
13,14
X'tal oscillator terminal
12
It connects a 7.6MHz crystal oscillator.
4k
14 13
1M
−
6
15
Chip enable terminal
The terminal to make high level in serial data input.
16
Clock input terminal
The clock which takes data and synchronization in
serial data input.
12
17
Data input terminal
15 16 17 18
or or or
−
The input terminal of the serial data which is
forwarded from the controller
6
18
Audio mute terminal
0.8VCC ≤ Pin18 : Mute ON
0.2VCC ≥ Pin18 : Mute OFF
19
Pilot signal adjust terminal
8
19
5k
1
2 VCC
6

Audio ICs
BH1415F
•Electrical characteristics (Unless otherwise noted Ta = 25°C, VCC = 5.0V, Signal source : fIN = 400Hz)
Parameter
Symbol Min. Typ. Max. Unit Conditions Measurement
circuit
Quiescent current
IQ 14 20 28 mA
Fig.1
Channel separation Sep 25 40 − dB
VIN=−20dBV
L→R,R→L
Fig.2
Total harmonic distortion THD − 0.1 0.3 %
VIN=−20dBV
L+R
Fig.3
Channel balance
C.B −2 0 +2 dB
VIN=−20dBV
L+R
Fig.2
Input output gain
Gv −2 0 +2 dB
VIN=−20dBV
L+R
Pilot modulation rate
MP 12 15 18 %
VIN=−20dBV,L+R
Pin5
Fig.3
Fig.3
Sub carrier rejection ratio SCR − −30 −20 dB
VIN=−20dBV
L+R
Fig.3
Pre-emphasis time constant
Limiter input level
τ PRE
VIN(LIM)
40
−16
50
−13
60
−10
µsec
dBV
VIN=−20dBV
L+R
Output level at 1dB gain compression
Fig.3
Fig.4
LPF cut off frequency
Mute attenuation volume
fC(LPF)
VO(MUTE)
12
−
15
−48
18
−42
kHz
dB
VO=−3dB
Pin2,21Open
VIN=−20dBV
L+R
Fig.5
Fig.3
Transmission output level
"H" level input current
VTX
IIH
97
−
100
−
103
1.0
dBµV
µA
fTX=100MHz
Pin15,16,17,18 VIN=5V
Fig.6
Fig.7
"L" level input current
IIL −1.0 − − µA Pin15,16,17,18 VIN=0V
Fig.7
"H" level output voltage VOH
VCC-
1.0
VCC-
0.15
− V Pin7 IOUT=−1.0mA
Fig.7
"L" level output voltage
"off" level leak current1
VOL
IOFF1
−
−
0.15
−
1.0
100
V
nA
Pin7 IOUT=1.0mA
Pin7 VOUT=5V
Fig.7
Fig.8
"off" level leak current2 IOFF2 −100 − − nA Pin7 VOUT=GND
Fig.8

Audio ICs
BH1415F
•Measurement circuits
Quiescent current
7.6MHz
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
−
+
Pre-emphasis
and Limiter
+
−
LPF
LPF
VCC
2
MPX
+
MUTE
Shift register
GND
1
2
Phase
detector
VCC
1
50
1
19
Program counter
OSC
1
4
RF
RF GND
1 2 3 4 5 6 7 8 9 10 11
2200p
150p
10µ
2200p
150p
Muting
Data
Clock
Chip enable
27p
27p
0.01µ
0.01µ
100µ
+5V
IQ
A
Fig.1

Audio ICs
BH1415F
Channel separation
Channel balance
7.6MHz
10µ
2200p
150p
470p
Muting
Data
Clock
Chip enable
27p
27p
0.01µ
L-ch
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
fIN = 400Hz
VIN = -20dBV
R-ch
10µ
−
+
Pre-emphasis
and Limiter
+
−
LPF
LPF
VCC
2
MPX
+
MUTE
Shift register
GND
1
2
Phase
detector
VCC
1
50
1
19
Program counter
OSC
1
4
RF
RF GND
1 2 3 4 5 6 7 8 9 10 11
2200p
150p
10µ
10µ
10k
0.01µ
100µ
Stereo signal demodulator
+5V
L-ch
V ~
V ~
R-ch
Sep, C.B
Fig.2

Audio ICs
BH1415F
Total harmonic distortion
Input output gain
Pilot index of modulation
Sub carrier rejection ratio
Pre-emphasis time constant
Mute attenuation volume
0V→5V (Mute ON)
7.6MHz
10µ
+
2200p
150p
470p
Data
Clock
Chip enable
27p
27p
0.01µ
L-ch
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
~
fIN=400Hz
VIN=−20dBV
R-ch
10µ
+
LPF
LPF
MPX
Shift register
Program counter
Phase
detector
+
OSC RF
VCC
2
GND
VCC
RF GND
1 2 3 4 5 6 7 8 9 10 11
2200p
−
+
Pre-emphasis
and Limiter
+
−
150p
10µ
+
10µ
+
MUTE
1
2
0.01µ
+
100µ
1
50
1
19
1
4
10k
Spectrum
analyzer
SCR
GV, MP
τ PRE
IHF BPF
200Hz~15kHz
+5V
THD, VO(MUTE)
0
Output response (dB)
-10
-20
-30
-40
-50
SCR
-60
0 10k
20k 30k 40k 50k
Frequency (Hz)
Fig.3

Audio ICs
BH1415F
Limiter input level
7.6MHz
10µ
+
2200p
150p
470p
Muting
Data
Clock
Chip enable
27p
27p
0.01µ
L-ch
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
~
fIN=400Hz
R-ch
10µ
+
LPF
LPF
MPX
Shift register
Program counter
Phase
detector
+
OSC RF
VCC
2
GND
VCC
RF GND
1 2 3 4 5 6 7 8 9 10 11
2200p
−
+
Pre-emphasis
and Limiter
+
−
150p
10µ
+
10µ
+
MUTE
1
2
0.01µ
+
100µ
1
50
1
19
1
4
10k
VIN (LIM)
+5V
Output level (dBV)
1dB
Input level (dBV)
VIN(LIM)
Fig.4

Audio ICs
BH1415F
LPF cut off frequency
7.6MHz
10µ
+
150p
470p
Muting
Data
Clock
Chip enable
27p
27p
0.01µ
L-ch
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
~
fIN=400Hz
VIN=−20dBV
R-ch
10µ
+
−
+
Pre-emphasis
and Limiter
+
−
LPF
LPF
MPX
Shift register
Program counter
Phase
detector
+
OSC RF
VCC
2
GND
VCC
RF GND
1 2 3 4 5 6 7 8 9 10 11
150p
10µ
+
10µ
+
MUTE
1
2
0.01µ
+
100µ
1
50
1
19
1
4
10k
fC (LPF)
+5V
Output response (dB)
3dB
Frequency (Hz)
Fig.5
fC(LPF)

Audio ICs
BH1415F
Transmission output level
7.6MHz
Muting
Data
Clock
Chip enable
27p
27p
0.01µ
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
−
+
Pre-emphasis
and Limiter
+
−
LPF
LPF
VCC
2
MPX
+
MUTE
Shift register
GND
20k
1
2
Phase
detector
0.01µ
VCC
1
50
1
19
10p
Program counter
OSC
22p
1
4
RF
RF GND
1 2 3 4 5 6 7 8 9 10 11
10µ
+
+
100µ
FEM10C-3F6
(SUMIDA)
33p
1000p
10k
KV-1471E
(TOKO)
VTX
Spectrum
analyzer
Zin=50Ω
fTX=100MHz
0.047µ
5.1k
100
33µ
+
10k
+5V
2SC2062S
(ROHM)
1000p
Fig.6

Audio ICs
BH1415F
“H” level input current
“L” level input current
“H” level output voltage
“L” level output voltage
0V, 5V A
IIH, IIL
7.6MHz
Muting
Data
Clock
Chip enable
27p
27p
0.01µ
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
−
+
Pre-emphasis
and Limiter
+
−
LPF
LPF
VCC
2
MPX
+
MUTE
Shift register
GND
1
2
Phase
detector
0.01µ
VCC
1
50
1
19
Program counter
OSC
1
4
RF
RF GND
1 2 3 4 5 6 7 8 9 10 11
+
100µ
VOH, VOL
V
VOH
VOL
1mA
1mA
+5V
Fig.7

Audio ICs
BH1415F
“off ” level leak input current
7.6MHz
Muting
Data
Clock
Chip enable
27p
27p
0.01µ
22 21 20 19 18 17 16 15 14 13 12
PLL VCC
−
+
Pre-emphasis
and Limiter
+
−
LPF
LPF
VCC
2
MPX
+
MUTE
Shift register
GND
1
2
Phase
detector
0.01µ
VCC
1
50
1
19
Program counter
OSC
1
4
RF
RF GND
1 2 3 4 5 6 7 8 9 10 11
+
100µ
IOFF1, IOFF2
A
0V, 5V
+5V
Fig.8

Audio ICs
BH1415F
•Circuit 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
DA
D0 D1 D2 D3 D4 PD1 T0 T1
Internal data
Composition of the serial data
DA
D0
D1
D2
(1) PR-CTL
(2) OM-CTL
(3) PD-CTL
D3
(4) TEST
D4
D5
D6
D7
D8
D9
D10
MONO
PD0
PD1
T0
T1
Explanation of the serial data
No. Control unit / Data Contents
(1) PROGRAM COUNTER
D0 ~ D10
· 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.
Example
In case of 99.7MHz oscillation
99.7MHZ ÷ 100kHZ(fref) = 997 → 3E5(HEX)
5
E 3
1 0 1 0 0 1 1 1 1 1 0
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
LSB
MSB

Audio ICs
BH1415F
No. Control unit / Data Contents
(2)
MULTIPLEXER
• It changes a stereo and monaural operation.
MONO
MONO
0
1
Condition of the composite signal
Monaural operation L+R , Pilot OFF
Stereo operation L+R+(L-R),sinωst+Psin
2
t
ωs
(2)
PHASE DETECTOR
• It controls charge pump output by the phase comparator compulsorily.
PD0, PD1
PD0 PD1
0 0
0 1
Charge pump output
Usual operation
Compulsion by Low
1
0
Compulsion by High
1 1
High impedance
(3)
TEST MODE
T0, T1
• It is data for the LSI test.
• Always in T0 Input "1".
• Always in T1 Input "0".
•External dimensions (Units : mm)
13.6 ± 0.2
22
12
1.8 ± 0.1
7.8 ± 0.3
5.4 ± 0.2
0.11
1
1.27
0.4 ± 0.1
11
0.3Min.
0.15 ± 0.1
0.15
SOP22

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