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PDF BL1062A1 Data sheet ( Hoja de datos )
| Número de pieza | BL1062A1 | |
| Descripción | Low voltage transmission circuits | |
| Fabricantes | SHANGHAI BELLING | |
| Logotipo |  |
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BL1062A1
Low voltage transmission circuits with dialer interface
1. GENERAL DESCRIPTION
The BL1062A1 is integrated circuits that perform all speech and line interface functions
required in fully electronic telephone sets. It performs electronic switching between dialling and
speech. The ICs operate at line voltage down to 1.6 V DC (with reduced performance) to facilitate
the use of more telephone sets connected in parallel. BL1062A1 improves the EMC performance
in-circuit that can enhance the telephone sets’ EMC.
2. FEATURES
Low DC line voltage; operates down to 1.6 V (excluding polarity guard)
Voltage regulator with adjustable static resistance
Provides a supply for external circuits
Symmetrical high-impedance inputs (64 Κ Ω ) for dynamic, magnetic or piezoelectric
microphones
Asymmetrical high-impedance input (32 ΚΩ) for electret microphones
DTMF signal input with confidence tone
Mute input for pulse or DTMF dialling, active LOW (MUTE)
Receiving amplifier for dynamic, magnetic or piezoelectric earpieces
Large gain setting ranges on microphone and earpiece amplifiers
Line loss compensation (line current dependent) for microphone and earpiece amplifiers
Gain control curve adaptable to exchange supply
DC line voltage adjustment facility
Enhanced EMC performanc
3. BLOCK DIAGRAM
http://www.belling.com.cn
Fig. 1 Block Diagram
-1-
Total 7 Pages
8/25/2006
Wrote by 2006
1 page  
Vo(rms)
△GV
△GV
△GV
IlineH
IlineL
output voltage
(RMS value)
MIC- or MIC+ to
LN
Voltage gain from
DTMT to QR
Controlling the
gain from IR to QR
and the gain from
MIC+,MIC- to LN
gain control range
Hightest
line
current
for
maximum gain
Lowest
line
current
for
maximum gain
THD = 10%; R4 = 100 kΩ;
Iline =15 mA; RL = 150 Ω
MUTE=Low
R4=100kΩ; RL=300Ω
MUTE=Low
R6=110kΩ
(bewteen AGC and VEE)
Iline=70mA
BL1062A1
15 V
70 dB
-17 dB
-5.8 dB
23 mA
61 mA
http://www.belling.com.cn
-5-
Total 7 Pages
8/25/2006
Wrote by 2006
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BL1062A1.PDF ] | |
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