27.1.1999
Xo0245e4_fm5.fm
5
Product: LIF-40 (Line Interface) / YO0245
9.1.3.3 Connectors
X120
X121
9.1.3.4 Audio
The audio unit consists of operation amplifiers I100C and I100D and their peripheral
components. The low-frequency alternating current passing through the two-wire
data terminal is formed by a current coming from the I100D output through resistor
R109 (signal received by the data terminal) and by a current coming through resistor
R109 to I100C (signal transmitted by the data terminal). R109/C111 is used for gen-
erating the line impedance appropriate to the data terminal.
The -3 dBm level (549 mVrms / 600 ohm) causes a 400 mVrms voltage in the EXT-
MIC line and a ±3 kHz deviation in the transmitter. Likewise, the ±3 kHz deviation in
the receiver causes a 400 mVrms voltage in the EXTERP line and a -16 dBm level
(123 mVrms / 600 ohm) in the data terminal.
9.1.3.5 Basic Frequencies
Components R114, R115, C109 and I105 form an oscillator vibrating at a frequency
of approx 220 kHz. This frequency is divided within I105 into frequencies 430 Hz
(free/reserved tone) and 26 Hz (ring frequency).
9.1.3.6 Switched Mode Voltage Converter
The basic chopper connection consists of operation amplifier I100A, quad NAND
I101, MOSFET Q100, and coil L100. Saw wave to the I101A input pin 2 is generated
from the basic frequency 220 kHz by using resistor R131 and capacitor C121. By
changing the dc-level of the saw wave, the operation amplifier I100A controls the
pulse width at gate Q100.
An extended width pulse from the basic frequency is brought to the I101A input pin 1
in order to make sure that the MOSFET is led to be momentarily non-conductive in
every cycle.
1
EXTMIC
MIC input for hand-portable
400 mVrms
2
GND
Signal ground
3
EXTERp
ERP output from hand-portable
200 mVrms
4
VBAT
NiCd battery voltage
7.2 V
5
I2CDAT
I2C-connection data line
0/5 V
6
I2CCLK
I2C-connection clock line
0/5 V
7
I2CINT
I2C-connection interrupt
0/5 V
1
LB
Two-wire connection to data terminal
2
LA
Summary of Contents for SIGMA GOLD TDP-52-SN3
Page 1: ...27 1 1999 Dp_52ngbTOC fm 1 Product TDP 52 SN3 SERVICE MANUAL BENEFON SIGMA GOLD TDP 52 SN3 ...
Page 12: ...27 1 1999 2DP_52GB 7 Product TDP 52 SN3 General Line interface Branching unit LIF 40 DB 40 ...
Page 15: ...1user_gb fm 1 2 0 OWNER S MANUAL ...
Page 57: ...27 1 1999 4A0701GB __1 23 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 58: ...27 1 1999 4A0701GB __1 24 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 59: ...27 1 1999 4A0701GB __1 25 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 60: ...27 1 1999 4A0701GB __1 26 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 61: ...27 1 1999 4A0701GB __1 27 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 62: ...27 1 1999 4A0701GB __1 28 Product TDP 52 SN3 Sigma Gold OA0701 Proc ...
Page 67: ...27 1 1999 4H0700GB __2 33 Product TDP 52 SN3 Sigma Gold OH0700 The Top Side Layout PH0700 A5 ...
Page 69: ...27 1 1999 4H0700GB __2 35 Product TDP 52 SN3 Sigma Gold OH0700 ...
Page 84: ...27 1 1999 4Y0725GB 50 Product TDP 52 SN3 Sigma Gold OY0725 RF ...
Page 85: ...27 1 1999 4Y0725GB 51 Product TDP 52 SN3 Sigma Gold OY0725 RF ...
Page 86: ...27 1 1999 4Y0725GB 52 Product TDP 52 SN3 Sigma Gold OY0725 RF ...
Page 87: ...26 1 1999 8HAR_GB fm 1 6 0 CHARGING CHARGING ...
Page 90: ...26 1 1999 8CARA_GB fm 1 7 0 CAR ASSEMBLY KIT CAR ASSEMBLY KIT ...
Page 98: ...27 1 1999 8udh50gb_fm5 fm 9 Product UDH 50 Carbox OO0700 The Top Side Layout PW0700B2 ...
Page 99: ...27 1 1999 8udh50gb_fm5 fm 10 Product UDH 50 Carbox OO0700 The Bottom Side Layout PW0700B2 ...
Page 100: ...27 1 1999 8udh50gb_fm5 fm 11 Product UDH 50 Carbox OO0700 A2 ...
Page 101: ...27 1 1999 8udh50gb_fm5 fm 12 Product UDH 50 Carbox OO0700 A2 ...
Page 102: ...27 1 1999 8udh50gb_fm5 fm 13 Product UDH 50 Carbox OO0700 A2 ...
Page 103: ...27 1 1999 8udh50gb_fm5 fm 14 Product UDH 50 Carbox OO0700 A2 ...
Page 113: ...27 1 1999 8UDH50GB __1_f 24 Product UDH 50 Carbox OW0700 The Top Side Layout PW0700A5 ...
Page 114: ...27 1 1999 8UDH50GB __1_f 25 Product UDH 50 Carbox OW0700 The Bottom Side Layout PW0700A5 ...
Page 115: ...27 1 1999 8UDH50GB __1_f 26 Product UDH 50 Carbox OW0700 A5 ...
Page 116: ...27 1 1999 8UDH50GB __1_f 27 Product UDH 50 Carbox OW0700 A5 ...
Page 117: ...27 1 1999 8UDH50GB __1_f 28 Product UDH 50 Carbox OW0700 A5 ...
Page 118: ...27 1 1999 8UDH50GB __1_f 29 Product UDH 50 Carbox OW0700 A5 ...
Page 119: ...27 1 1999 8UDH50GB __1_f 30 Product UDH 50 Carbox OW0700 A5 ...
Page 124: ...27 1 1999 8kds50gb_fm5 fm 35 Product KDS 50 Hands free Cradle YO0701 KDS 50 ...
Page 131: ...27 1 1999 8HDS50GB_fm5 f 42 Product HDS 50 Ext Handset With Cradle HLS 41 HDS 50 HXS 40 ...
Page 133: ...27 1 1999 8OSET_GB fm 1 8 0 OFFICE SET OFFICE SET ...
Page 147: ...27 1 1999 8dds50gb_fm5 fm 15 Product DDS 50 Office set OO0303 ...
Page 148: ...27 1 1999 8dds50gb_fm5 fm 16 Product DDS 50 Office set OO0303 ...
Page 149: ...27 1 1999 8dds50gb_fm5 fm 17 Product DDS 50 Office set OO0303 ...
Page 151: ...27 1 1999 8dds50gb_fm5 fm 19 Product DDS 50 Office set OO0301 ...
Page 153: ...27 1 1999 8dds50gb_fm5 fm 21 Product DDS 50 Office set OO0302 ...
Page 154: ...27 1 1999 8dds50gb_fm5 fm 22 Product DDS 50 Office set OO0302 ...
Page 161: ...27 1 1999 8hxs40gb_fm5 fm 29 Product HXS 40 External Handset HLS 41 HDS 50 HXS 40 ...
Page 162: ...27 1 1999 8OTHE_GB fm 1 9 0 OTHER ACCESSORIES OTHER ACCESSORIES ...
Page 174: ...27 1 1999 Xo0245e4_fm5 fm 13 Product LIF 40 Line Interface OO0245 Solder Side Layout PO0245A0 ...
Page 175: ...27 1 1999 Xo0245e4_fm5 fm 14 Product LIF 40 Line Interface OO0245 ...
Page 176: ...27 1 1999 Xo0245e4_fm5 fm 15 Product LIF 40 Line Interface OO0245 ...
Page 177: ...27 1 1999 Xo0236e4_fm5 fm 16 Product DB 40 Branching Unit YO0236 9 2 BRANCHING UNIT YO0236 ...
Page 183: ...27 1 1999 Xo0236e4_fm5 fm 22 Product DB 40 Branching Unit OO0241 ...