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PBL385701N 데이터시트 PDF




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부품번호 PBL385701N 기능
기능 Universal Speech Circuit
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PBL385701N 데이터시트, 핀배열, 회로
September 1997
PBL 385 70
Universal Speech Circuit
Description.
Key features.
PBL 38570 is a monolithic integrated speech transmission circuit for use in electronic • Minimum number of external
telephones. It is designed to accomodate either a low impedance dynamic or an electret
components, 7 capacitors and 11
microphone. A separate input for DTMF dialling tones that is controlled by a mute signal,
resistors.
and a signal summing point at the transmitter input, are available.
• Easy adaption to various market
An internally preset line length compensation can be adjusted with external resistors
needs.
to fit into different current feed systems as for ex. 48 V, 2 x 200 ohms, 48 V, 2 x 400 ohms • Mute control input for operation with
and 48 V, 2 x 800 ohms. The line length compensation can be shut off in either high or
DTMF - generator.
low gain mode. Application dependent parameters such as line balance, side tone level, • A separate input for DTMF tones
transmitter and receiver gains and frequency responces are set independently by
controlled by mute.
external components which means an easy adaption to various market needs.
• Transmitter and receiver gain
The setting of the parameters if carried out in certain order will counteract the
regulation for automatic loop loss
interaction between the settings.
compensation.
A number of different DC - supplies are provided to feed microphones and diallers. • Extended current and voltage range
5 - 130 mA, down to 2 V.
• Differential microphone input for
good balance to ground.
• Balanced receiver output stage.
• Stabilized DC - supplies for low
current CMOS diallers and electret
microphones.
• 18 - pin DIP and 20 - pin SO packa-
ges.
• Short start up time.
• Excellent RFI performance.
DTMF
input
Mic.
Mute
(active low)
DC-output for
external devices
10
AD
12
13 AM
DC-supply
89 7
6
Sense input
1
PBL 385 70
AT AR
17
18
5 11 3
2
15 16 14 + 4
5 Gain
regulation
+
43
2
1
+
Telephone
line
1. Line impedance and radio interference suppression.
2. Transmit gain and frequency response network.
3. Receive gain and frequency response network.
4. Side tone balance network.
5. DC-supply components.
Figure 1. Functional diagram. DIP package.
20-pin plastic SO
18-pin plastic DIP
1




PBL385701N pdf, 반도체, 판매, 대치품
PBL 385 70
+L 1
TO 2
TI 3
+C 4
Mute 5
GR 6
DCS 7
DCO 8
DCC 9
18 RE 2
17 RE 1
16 DR
15 RI
14 -L
13 MI 2
12 MI 1
11 MO
10 DI
Figure 5. Pin configuration.
18-pin DIP
+L 1
TO 2
TI 3
+C 4
Mute 5
GR 6
DCS 7
DCO 8
DCC 9
NC 10
20 RE 2
19 RE 1
18 DR
17 RI
16 -L
15 MI 2
14 MI 1
13 MO
12 DI
11 NC
20-pin SO
Pin Descriptions
Refer to figure 5.
DIP SO Name
11
+L
22
TO
33
44
TI
+C
55
Mute
66
77
88
99
10 12
11 13
12 14
13 15
14 16
15 17
16 18
17 19
18 20
10
11
GR
DCS
DC1
DC2
DI
MO
}MI 1
MI 2
-L
RI
DR
}RE 1
RE 2
Function
Output of the DC-regulator and transmit amplifier, connected to the line through a polarity
guard diode bridge.
Output of the transmit amplifier, connected through a resistor of 47 to 100 ohm to -L,
sets the DC-characteristics of the circuit. The output has a low AC output impedance and the
signal is used to drive a side tone balancing network.
Input of transmit amplifier. Input impedance 17 kohm ± 20 %.
Positive power supply terminal for most of the circuitry inside the PBL 385 70 (about 1 mA current
consumption). The +C pin must be connected to a decoupling capacitor of 47 µF to 150 µF.
When low, speech circuit is muted and the DTMF input is enabled. Maximum voltage (at mute) is
0.3 V, current sink requirement of external driver is min. 50 µA.
Control input for the gain regulation circuitry.
Sense input to the DC-supply.
Output from the DC-supply.
Control of the DC-supply.
Input for the DTMF-signal. Input impedance is 25 kohm ± 20 %.
Output of the microphone amplifier or DTMF-amplifier.
Inputs to the microphone amplifier. Input impedance 1.7 kohm ± 20 %.
The negative power terminal, connected to the line through a polarity guard diode bridge.
Input of receiver amplifier. Input impedance is 38 kohm ± 20 %.
Control input for the receiver amplifier driving capacity.
Receiver amplifier outputs. Output impedance is approximately 3 ohm.
NC
NC
4

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PBL385701N 전자부품, 판매, 대치품
PBL 385 70
and this way to all functions, resulting
among other things in a bad mute. Hence
it is better regarding noise perfomance
and mute to rather use the gain of the
microphone amplifier than the gain of the
microphone itself (in case of electret) flat
out. A more suitable level of gain from the
microphone is achieved by using a load
resistance of 330 - 820. A low microphone
impedance will also improve RFI sup-
pression. Gain setting to the line is done at
the input of the transmitter. The microphone
amplifier has its own temperature stable
reference to prevent overhearing to other
parts and functions on the chip.
It is possible to use the microphone
amplifier as a limiter ( added to the limiter
in the transmitter output stage ) of the
transmitted signal. See fig. 9. The positive
output swing is then limited by the peak
output current of the microphone amplifier.
The negative swing is limited by the
saturation voltage of the output amplifier.
The output of the amplifier is DC-vice at
internal reference level (1.2V). The lowest
negative level for the signal is reference
minus one diode and sat. transistor drop.
(1.2-0.6-0.1 = 0.5V) The correct clipping
level is found by determining the composite
AC- and DC-load that gives a maximum
symmetrical unclipped signal at the out-
put. This signal is then fed into the trans-
mitter amplifier at a level that renders a
symmetrical signal clipping on the line.
(adjust with ratio R4,R5) The total trans-
mitter gain when an electret microphone is
used can then be adjusted with the load
resistor of the electret microphones buffer
amplifier.
11 3
(a)
RA
CA
11 3
(b)
RA
CA
attn. = RTI//(RTI+RA)
(a and b)
no attn. = RA = 0
CB
11 3
(c)
RA
CA
a
RB
attenuation a
11 3
CC (d)
RA
CA
RB
attn.without dc.
11 3
(e)
RA
CA
RB CB
attenuation
11 3
(f)
CC
RA
CA
RB CB
attn.without dc.
a
(a),(c), (d)
f
(b),(e)
big CA
small CA
(f)
f
f
Figure 10. Network and frequency plots between microphone amplifier and transmitter.
Transmitter amplifier
The transmitter amplifier in PBL38570
consists of three stages. The first stage is
an amplitude limiter for the input signal at
TI, in order to prevent the transmitted sig-
nal to exceed a certain set level and cause
distortion. The second stage amplifies
further the signal from the first and adds it
to a DC level from an internal DC-regulation
loop in order to give the required DC
characteristic to the telephone set. The
output of this stage is TO. The third stage
is a current generator that presents a high
impedance towards the line and has its
gain from TO to +L. The gain of this
amplifier is ZL/R6 where ZL is the
impedance across the telephone line.
Hence, the absolute maximum signal
How to calculate the gains in the transmitter channel.
See fig. 2 and 4.
Microphone amplifiers first stage 19 dB.
Microphone amplifiers regulated second stage 10.5 dB - 15.5 dB
Regulation interval 10.5 - 15.5 dB low gain 19.0 + 10.5 dB = 29.5 dB
high gain 19.0 + 15.5 dB = 34.5 dB
PBL
385 70 constant
current
generator
11
DC-
load
DC
( ref. 1.2V)
ref. minus
a diode 0.5V
AC-
load
V 2 = RM GM R 5 GTX Rload
V 3 Zmic + RM
R4 +R5
R6
RM = Microphone amplifier input resistance
Rload = Rline // Rtelephone
ex. calculate the gain of the transmitter stage GTX at 0 - line length:
43 = 20log( (1.7 / /2.7)k ) + 29.5 + 20log( (17 / /22)k )
350Ω + (1.7 / /2.7)k
18k + (17 / /22)k
+GTX + 20log( 600/ /910)
75
DC-load = R4+R5
AC-load = R4+R5//ZTI
Figure 9. Micophone amplifier output
clipping.
43 = −2.51+ 29.5 9.17 + GTX + 13.66
GTX = 11.52dB
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