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PBL385731NS 데이터시트 PDF




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부품번호 PBL385731NS 기능
기능 Speech Circuit for constant current feeding systems
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PBL385731NS 데이터시트, 핀배열, 회로
PBJLun3e81597993
PBL 385 73
Speech Circuit for constant current
feeding systems
Description.
Key features.
PBL 38573 is a monolithic integrated speech transmission circuit for use in
electronic telephones. It is intended specially for telephone lines with constant current
feed. Maximum line current less than 130 mA in DIL package (100 mA in SO package).
It is designed to accomodate either a low impedance dynamic or an electret microphone.
A signal summing point at the transmitter input is available for DTMF dialler- and
possible monitor or handsfree signals. An available internally preset line length
compensation can be adjusted or shut off in low gain mode with external resistors.
Application dependent parameters such as line balance, side tone level, transmitter and
receiver gains and frequency responces are set independently by external components
which means an easy adaption to various market needs. The setting of the parameters
if carried out in certain order will counteract the interaction between the settings. A DC-
supply is provided to feed microphones and diallers.
1
9 PBL 385 73
MIC.
AM
10
AT
Mute
(active low)
DTMF - input
DC supply for
external devices
DC-supply
7
6
5
+
5 83
2
2
4
13
AR
12 11
14
+4
REC
3
+
1
Telephone
line
• Minimum number of external
components for function,with one filte-
red DC-supply. 6 capacitors and 10
resistors.
• Easy adaption to various market
needs.
• Mute control input for operation with
DTMF - generator.
• Transmitter and receiver gain
regulation for automatic loop loss
compensation. Disconnectable.
• Extended current and voltage range
5 - 130mA (DIP), down to 2 V.
• Differential microphone input for good
balance to ground.
• Balanced receiver output stage.
• Stabilized DC - supply for low current
CMOS diallers and electret
microphones.
• Short start up time.
• Excellent RFI performance.
• In 14- pin DIP and SO packages.
14-pin plastic SO
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.
14-pin plastic DIP
1




PBL385731NS pdf, 반도체, 판매, 대치품
PBL 385 73
+L 1
TO 2
TI 3
+C 4
Mute 5
GR 6
DCO 7
14 RE 2
13 RE 1
12 RI
11 -L
10 MI 2
9 MI 1
8 MO
14-pin DIP
Figure 5. Pin configurations.
+L 1
TO 2
TI 3
+C 4
Mute 5
GR 6
DCO 7
14 RE 2
13 RE 1
12 RI
117 -L
106 MI 2
9 MI 1
8 MO
14-pin SO
Pin Descriptions:
Refer to figure 5.
Pin Name
Function
1 +L
2 TO
3 TI
4 +C
5 Mute
6 GR
7 DCO
8 MO
}9 MI 1
10 MI 2
11 -L
12 RI
}13 RE 1
14 RE 2
Output of the DC-regulator and transmit amplifier. This pin is connected to the line through a polarity
guard diode bridge.
Output of the transmit amplifier. This pin is 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 transmit amplifier. Input impedance 17 kohm ± 20 %.
Positive power supply terminal for most of the circuitry inside the PBL 385 73 ( current consumption
about 1 mA). The +C pin shall be connected to a decoupling capacitor of 47 µF to 150 µF.
Maximum voltage (to mute) is 0.3 V, current sink requirement of external driver is 100 µA.
Input of the gain regulation with line length.
Output of the auxiliary DC-supply.
Output of the microphone amplifier or DTMF-amplifier.
Microphone amplifier Inputs. 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 %.
Receiver amplifier outputs. Output impedance is approximately 3 ohm.
4

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PBL385731NS 전자부품, 판매, 대치품
PBL 385 73
PBL
38573 constant
current
generator
8
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.
(a) PBL 38573
8
9
M
10 +
Dynamic
microphone
R
C+
(c)
8
4
PBL 38573
9
M
10 +
Balanced electret microphone.
An additional RC filterlink is
recommended if pin 4 is used
as a supply.
(b) 4 PBL 38573
8
9
M
10 +
Unbalanced electret
mic. with balanced
signal, DC-supply from
pin 4.
DC
pin 7.
(d)
8
PBL 38573
9
M
10 +
Balanced electret
microphone
Figure 10. Microphone solutions.
Transmitter amplifier
The transmitter amplifier in PBL38573 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 further amplifies 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.7 (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
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부품번호상세설명 및 기능제조사
PBL385731NS

Speech Circuit for constant current feeding systems

Ericsson
Ericsson

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