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PBL385411SO 데이터시트 PDF




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부품번호 PBL385411SO 기능
기능 Universal Speech Circuit
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PBL385411SO 데이터시트, 핀배열, 회로
NoPvBemLb3er81594918
PBL 385 41
Universal Speech Circuit
Description.
Key features.
PBL 38541 is a monolithic integrated speech transmission circuit for use in • Minimum number of external
electronic telephones or in any other line interface application. High settable supply
components, with two filtered DC-
current for auxiliary functions, up to 6.0 mA (at high line currents). The circuit is designed
supplies, 7 capacitors and 11
to accomodate either a low impedance dynamic or an electret microphone. Microphone
resistors.
can be muted separately. Payphone signaling and DTMF dialling tones have a separate • Easy adaption to various market
input that is controlled by a mute signal. A signal summing point is available at the
needs.
transmitter input. An internally preset line length compensation can be adjusted with • Mute control input for operation with
external resistors to fit into different current feed systems as for ex. 48 V, 2 x 200 ohms,
DTMF - generator.
48 V, 2 x 400 ohms and 48 V, 2 x 800 ohms. The line length compensation can be shut • A separate signaling input for
off in either high or low gain mode. Application dependent parameters such as line
payphone and DTMF tones controlled
balance, side tone level, transmitter and receiver gains and frequency responces are set
by mute.
independently by external components which means an easy adaption to various market • Transmitter and receiver gain
needs. The setting of the parameters if carried out in certain order will counteract the
regulation for automatic loop loss
interaction between the settings. The circuit provides four different DC - supplies to feed
compensation.
microphones,diallers and other more current consuming functions like handsfree systems. • Extended current and voltage range
4 - 130 mA, down to 2 .2V.
Pin numbers in this datasheet refer to 18-pin DIP package unless otherwhise noted. • Differential microphone input for good
balance to ground.
• Balanced receiver output stage.
• One stabilized DC - supply for low
current CMOS diallers and or electret
DTMF
input
Mic.
Mute
(active low)
DC1- output for
external devices
10
AD
12
13 AM
DC-supply
89 7
6
5
1
PBL 385 41
AT AR
17
18
5 11 3
2
15 16 14 + 4
43
1
Telephone
line
microphones. One settable current
limited supply with 6 mA max. current.
• Short start up time.
• Excellent RFI performance.
• 18 - pin DIP and 20 - pin SO packages.
DC2 - output for
external devices
+
Gain
+ regulation
2
+
1. Impedance to the line and radio interference suppression
2. Transmitter gain and frequency responce network
3. Receiver gain and frequency responce network
4. Sidetone balance network
5. DC supply components
Figure 1. Functional diagram DIP package.
20-pin plastic SO
18-pin plastic DIP
1




PBL385411SO pdf, 반도체, 판매, 대치품
PBL 385 41
+L 1
TO 2
TI 3
+C 4
Mute 5
GR 6
DCS1 7
DCO2 8
DCO1 9
18 RE 2
17 RE 1
16 DR
15 RI
14 -L
13 MI 2
12 MI 1
11 MO
10 DI
18-pin DIP
Figure 5. Pin configuration.
Pin Descriptions
Refer to figure 5.
DIP SO Name
Function
+L 1
TO 2
TI 3
+C 4
Mute 5
GR 6
DCS1 7
DCO2 8
DCO1 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
11
22
33
44
55
66
77
88
99
10 12
11 13
12 14
13 15
14 16
15 17
16 18
17 19
18 20
10
11
4
+L
TO
TI
+C
Mute
GR
DCS 1
DCO 2
DCO 1
DI
MO
}MI 1
MI 2
-L
RI
DR
}RE 1
RE 2
Output of the DC-regulator and transmitter amplifier, connected to the line through a polarity
guard diode bridge.
Output of the transmitter amplifier, connected through a resistor of 47 to 100 ohm to -L,
sets the DC-resistance 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 the transmitter amplifier. Input impedance 17 kohm ± 20 %.
Positive power supply terminal for most of the circuitry inside the PBL 385 41 (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 50 µA.
Control input for the gain regulation function.
Control input to the DC1-supply. A resistor to -line sets the maximum current load of the supply.
Output of the DC2-supply.
Output of the DC1-supply.
Input for the DTMF-signal. Input impedance 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 38 kohm ± 20 %.
Control input for the receiver amplifier driving capability.
Receiver amplifier outputs. Output impedance is approximately 3 ohm.
Not connected
Not connected

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PBL385411SO 전자부품, 판매, 대치품
PBL 385 41
PBL
385 41 constant
current
generator
11
DC-
load
DC
( ref. 1.2V )
ref. minus
a diode 0.5V
AC-
load
DC-load = R4+R5
AC-load = R4+R5//ZTI
Figure 9. Microphone amplifier output clipping.
Transmitter amplifier
(a) PBL 385 41
11
12
M
13 +
Dynamic
microphone
R
C+
(c)
11
4
PBL 385 41
12
M
13 +
Balanced electret microphone.
An additional RC filterlink is
recommended if pin 4 is used
as a supply.
(b) 4 PBL 385 41
11
12
M
13 +
Unbalanced electret
mic. with balanced
signal, DC-supply from
pin 4.
DC
Pin 8 or9.
(d)
11
12
PBL 385 41
M
13 +
Balanced electret
microphone
Figure 10. Microphone solutions.
The transmitter amplifier in PBL38541 consists of three stages. The first stage is an amplitude limiter for the input signal at TI, in
order to prevent the transmitted signal 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 amplitude that can be transmitted to the line undistorted is dependent of R6. (amplitude limiting)
The transmitter gain and frequency response are set by the RC-network between the pins 11 and 3. See fig.11. The capacitor
for cutting the high end of frequency band is best to be placed directly at the microphone where it also will act as a RFI suppressor.
The input signal source impedance to the transmitter amplifier input TI should be reasonably low in order to keep the gain spread down,
saying that R4//R5 (see fig. 4) must be at least a factor 5 lower than the ZTin. Observe that the capacitor C1 should have a reasonably
good temperature behaviour in order to keep the impedance rather constant. The V+C´s influence on the transmitter DC-characteristic
is shown in the fig.8 (DC-characteristic), therefore the transmitter gain would change if the transmitted signal gives reason to an ac-
voltage leak signal across C1 since this is a feedback point. If the transmitter has an unacceptable low sving to the line at low line
currents <10mA the first step should be to examine if the circuits DC characteristic can be adjusted upwards.
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
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 = 20 log( (1.7 / /2.7)k ) + 29.5 + 20 log( (17 / /22)k ) + GTX + 20 log( 600/ /910)
350Ω + (1.7 / /2.7)k
18k + (17 / /22)k
75
43 = −2.51+ 29.5 9.17 + GTX + 13.66
GTX = 11.52dB
7

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