Philips TEA1118AT-C1, TEA1118AM-C1, TEA1118T-C2, TEA1118T-C1, TEA1118M-C2 Datasheet
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INTEGRATED CIRCUITS
DATA SHEET
TEA1118; TEA1118A
Versatile cordless transmisssion circuit
Product specification |
1997 Jul 14 |
Supersedes data of 1996 Nov 26
File under Integrated Circuits, IC03
Philips Semiconductors |
Product specification |
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Versatile cordless transmisssion circuit |
TEA1118; TEA1118A |
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FEATURES
∙Low DC line voltage; operates down to 1.6 V (excluding polarity guard)
∙Voltage regulator with adjustable DC voltage
∙Provides a supply for external circuits
∙Symmetrical high impedance transmit inputs (62.5 kΩ) with large signals handling capabilities [up to
1 V (RMS value) with less than 2% THD]
∙Receive amplifier for dynamic, magnetic or piezoelectric earpieces
∙AGC line loss compensation for transmit and earpiece amplifiers
∙DTMF input with confidence tone (TEA1118A only)
∙MUTE input for pulse or DTMF dialling (TEA1118A only)
∙Transmit mute function, also enabling the DTMF input (TEA1118A only).
APPLICATIONS
∙Cordless telephone base stations
∙Fax machines
∙Answering machines.
QUICK REFERENCE DATA
GENERAL DESCRIPTION
The TEA1118 and TEA1118A are bipolar integrated circuits that perform all speech and line interface functions required in cordless telephone base stations. The ICs operate at a line voltage down to 1.6 V DC (with reduced performance) to facilitate the use of telephone sets connected in parallel.
The TEA1118A offers in addition to the TEA1118 electronic switching between speech and dialling. Moreover the transmit amplifier can be disabled during speech condition by means of a transmit mute function.
All statements and values refer to all versions unless otherwise specified.
Iline = 15 mA; VEE = 0 V; RSLPE = 20 Ω; AGC pin connected to VEE; Zline = 600 Ω; f = 1 kHz; Tamb = 25 °C; unless otherwise specified.
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PARAMETER |
CONDITIONS |
MIN. |
TYP. |
MAX. |
UNIT |
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Iline |
line current operating range |
normal operation |
11 |
− |
140 |
mA |
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with reduced performance |
1 |
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11 |
mA |
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VLN |
DC line voltage |
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3.35 |
3.65 |
3.95 |
V |
ICC |
internal current consumption |
VCC = 2.9 V |
− |
1.15 |
1.4 |
mA |
VCC |
supply voltage for peripherals |
IP = 0 mA |
− |
2.9 |
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V |
Gvtrx |
typical voltage gain range |
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transmit amplifier (TEA1118A only) |
VTX = 200 mV (RMS) |
− |
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11.3 |
dB |
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transmit amplifier (TEA1118 only) |
VTX = 200 mV (RMS) |
5.3 |
− |
11.3 |
dB |
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receive amplifier |
VIR = 4 mV (RMS) |
19 |
− |
31 |
dB |
Gvtrx |
gain control range for transmit and |
Iline = 75 mA |
− |
5.8 |
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dB |
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receive amplifiers with respect to |
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Iline = 15 mA |
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1997 Jul 14 |
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Philips Semiconductors |
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Product specification |
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Versatile cordless transmisssion circuit |
TEA1118; TEA1118A |
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ORDERING INFORMATION |
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TYPE |
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PACKAGE |
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NUMBER |
NAME |
DESCRIPTION |
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VERSION |
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TEA1118M |
SSOP16 |
plastic shrink small outline package; 16 leads; body width 4.4 mm |
SOT369-1 |
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TEA1118T |
SO14 |
plastic small outline package; 14 leads; body width 3.9 mm |
SOT108-1 |
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TEA1118AM |
SSOP16 |
plastic shrink small outline package; 16 leads; body width 4.4 mm |
SOT369-1 |
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TEA1118AT |
SO14 |
plastic small outline package; 14 leads; body width 3.9 mm |
SOT108-1 |
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BLOCK DIAGRAMS
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GAR |
QR |
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VCC |
IR |
V−>I |
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LN |
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CURRENT |
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REFERENCE |
TX+ |
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GAT |
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V−>I |
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TX− |
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REG |
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AGC |
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CIRCUIT |
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TEA1118M |
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TEA1118T |
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LOW VOLTAGE |
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CIRCUIT |
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MBH273 |
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VEE |
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SLPE |
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AGC |
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Fig.1 |
Block diagram (TEA1118). |
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1997 Jul 14 |
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3 |
Philips Semiconductors |
Product specification |
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Versatile cordless transmisssion circuit |
TEA1118; TEA1118A |
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GAR |
QR |
MUTE |
IR |
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V−>I |
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VCC |
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V−>I |
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LN |
DTMF |
ATTENUATOR |
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CURRENT |
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REFERENCE |
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V−>I |
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TX+ |
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V−>I |
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REG |
TX− |
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TMUTE |
TRANSMIT |
AGC |
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MUTE |
CIRCUIT |
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TEA1118AM |
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TEA1118AT |
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LOW VOLTAGE |
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CIRCUIT |
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MBH272 |
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VEE |
AGC |
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SLPE |
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Fig.2 |
Block diagram (TEA1118A). |
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1997 Jul 14 |
4 |
Philips Semiconductors |
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Product specification |
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Versatile cordless transmisssion circuit |
TEA1118; TEA1118A |
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PINNING |
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SYMBOL |
TEA1118 |
TEA1118A |
DESCRIPTION |
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SO14 |
SSOP16 |
SO14 |
SSOP16 |
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LN |
1 |
1 |
1 |
1 |
positive line terminal |
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SLPE |
2 |
2 |
2 |
2 |
slope (DC resistance) adjustment |
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REG |
3 |
3 |
3 |
3 |
line voltage regulator decoupling |
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GAT |
4 |
4 |
− |
− |
transmit gain adjustment |
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TMUTE |
− |
− |
4 |
5 |
transmit mute input |
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DTMF |
− |
− |
5 |
6 |
dual-tone multi-frequency input |
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MUTE |
− |
− |
6 |
8 |
mute input to select speech or dialling mode |
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IR |
7 |
9 |
7 |
9 |
receive amplifier input |
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AGC |
8 |
10 |
8 |
10 |
automatic gain control/line loss compensation |
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TX− |
9 |
11 |
9 |
11 |
inverting transmit amplifier input |
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TX+ |
10 |
12 |
10 |
12 |
non-inverting transmit amplifier input |
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VEE |
11 |
13 |
11 |
13 |
negative line terminal |
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QR |
12 |
14 |
12 |
14 |
receive amplifier output |
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GAR |
13 |
15 |
13 |
15 |
receive gain adjustment |
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VCC |
14 |
16 |
14 |
16 |
supply voltage for speech circuit and peripherals |
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n.c. |
5 and 6 |
5 to 8 |
− |
4 and 7 |
not connected |
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1997 Jul 14 |
5 |
Philips Semiconductors |
Product specification |
|
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Versatile cordless transmisssion circuit |
TEA1118; TEA1118A |
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handbook, halfpage
LN |
1 |
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14 |
VCC |
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SLPE |
2 |
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13 |
GAR |
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REG |
3 |
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12 |
QR |
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TEA1118T |
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VEE |
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GAT |
4 |
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11 |
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TX+ |
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n.c. |
5 |
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10 |
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TX− |
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n.c. |
6 |
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9 |
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IR |
7 |
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8 |
AGC |
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MBH269 |
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Fig.3 Pin configuration (TEA1118T).
handbook, halfpage |
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VCC |
LN |
1 |
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14 |
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SLPE |
2 |
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13 |
GAR |
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REG |
3 |
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12 |
QR |
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TEA1118AT |
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VEE |
TMUTE |
4 |
11 |
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TX+ |
DTMF |
5 |
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10 |
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TX− |
MUTE |
6 |
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9 |
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IR |
7 |
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8 |
AGC |
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handbook, halfpage
LN |
1 |
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16 |
VCC |
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SLPE |
2 |
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15 |
GAR |
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REG |
3 |
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14 |
QR |
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GAT |
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VEE |
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4 |
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13 |
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TEA1118M |
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TX+ |
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n.c. |
5 |
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12 |
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TX− |
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n.c. |
6 |
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11 |
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n.c. |
7 |
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10 |
AGC |
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n.c. |
8 |
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9 |
IR |
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MBH268 |
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Fig.4 Pin configuration (TEA1118M).
handbook, halfpage |
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VCC |
LN |
1 |
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16 |
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SLPE |
2 |
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15 |
GAR |
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REG |
3 |
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14 |
QR |
n.c. |
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VEE |
4 |
TEA1118AM |
13 |
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TX+ |
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TMUTE |
5 |
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12 |
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TX− |
DTMF |
6 |
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11 |
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n.c. |
7 |
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10 |
AGC |
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MUTE |
8 |
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9 |
IR |
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MBH271 |
MBH270 |
Fig.5 Pin configuration (TEA1118AT). |
Fig.6 Pin configuration (TEA1118AM). |
1997 Jul 14 |
6 |
Philips Semiconductors |
Product specification |
|
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Versatile cordless transmisssion circuit |
TEA1118; TEA1118A |
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FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except when otherwise specified.
Supplies (pins LN, SLPE, VCC and REG)
The supply for the TEA1118 and TEA1118A and their peripherals is obtained from the telephone line.
The ICs generate a stabilized reference voltage (Vref) between pins LN and SLPE. This reference voltage is equal to 3.35 V, is temperature compensated and can be adjusted by means of an external resistor (RVA). It can be increased by connecting the RVA resistor between
pins REG and SLPE (see Fig.11), or decreased by connecting the RVA resistor between pins REG and LN. The voltage at pin REG is used by the internal regulator to generate the stabilized reference voltage and is decoupled by a capacitor (CREG) which is connected to VEE.
This capacitor, converted into an equivalent inductance (see Section “Set impedance”), realizes the set impedance
conversion from its DC value (RSLPE) to its AC value (RCC in the audio-frequency range). The voltage at pin
SLPE is proportional to the line current. Figure 7 illustrates the supply configuration.
The ICs regulate the line voltage at pin LN, and it can be calculated as follows:
VLN = Vref + RSLPE × ISLPE
ISLPE = Iline − ICC − IP − I* = Ish
where:
Iline: line current
ICC: current consumption of the IC
IP: supply current for peripheral circuits
I*: current consumed between LN and VEE
Ish: the excess line current shunted to SLPE (and VEE) via LN.
The preferred value for RSLPE is 20 Ω. Changing RSLPE will affect more than the DC characteristics; it also influences
the transmit gain and the DTMF gain (TEA1118A only), the gain control characteristics, the sidetone level and the maximum output swing on the line.
The internal circuitry of the TEA1118 and TEA1118A is supplied from pin VCC. This voltage supply is derived from the line voltage by means of a resistor (RCC) and must be decoupled by a capacitor CVCC. It may also be used to supply peripheral circuits such as dialling or control circuits. The VCC voltage depends on the current consumed by the IC and the peripheral circuits as shown
by the formula (see also Figs 8 and 9). RCCint is the internal equivalent resistance of the voltage supply point,
and Irec is the current consumed by the output stage of the earpiece amplifier.
VCC = VCC0 − RCCint × (IP − Irec)
VCC0 = VLN − RCC × ICC
The DC line current flowing into the set is determined by the exchange supply voltage (Vexch), the feeding bridge
resistance (Rexch), the DC resistance of the telephone line (Rline) and the reference voltage (Vref). With line currents below 7.5 mA, the internal reference voltage (generating
Vref) is automatically adjusted to a lower value.
This means that more sets can operate in parallel with DC line voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.6 V. At currents below 7.5 mA, the circuit has limited transmit and receive levels. This is called the low voltage area.
Set impedance
In the audio frequency range, the dynamic impedance is mainly determined by the RCC resistor. The equivalent impedance of the circuits is illustrated in Fig.10.
Transmit amplifier (pins TX+, TX − and GAT)
The TEA1118 and TEA1118A have symmetrical transmit inputs. The input impedance between pins TX+ and TX− is equal to 62.5 kΩ; the input impedance between pins TX+/TX− and VEE is equal 36.5 kΩ. The voltage gain from pins TX+/TX− to pin LN is set at 11.3 dB.
Automatic gain control is provided on this amplifier for line loss compensation.
The gain of the TEA1118 can be decreased by connecting an external resistor RGAT between pins GAT and REG. The adjustment range is equal to 6 dB. A capacitor CGAT connected between pins GAT and REG can be used to provide a first-order low-pass filter. The cut-off frequency
corresponds to the time constant CGAT × (RGATint // RGAT). RGATint is the internal resistor which sets the gain with a typical value of 27 kΩ.
Transmit mute (pin TMUTE; TEA1118A only)
The transmit amplifier can be disabled by activating the transmit mute function. When TMUTE is LOW, the normal speech mode is entered, depending on the level on MUTE. When TMUTE is HIGH, the transmit amplifier inputs are disabled while the DTMF input is enabled (no confidence tone is provided). The voltage gain between LN and TX+/TX− is attenuated; the gain reduction is 80 dB.
1997 Jul 14 |
7 |
Philips Semiconductors |
Product specification |
|
|
Versatile cordless transmisssion circuit |
TEA1118; TEA1118A |
|
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Receive amplifier (pins IR, GAR and QR)
The receive amplifier has one input (IR) and one output (QR). The input impedance between pins IR and VEE is 20 kΩ. The voltage gain from pin IR to pin QR is set at 31 dB. The gain can be decreased by connecting an external resistor RGAR between pins GAR and QR; the adjustment range is 12 dB. Two external capacitors CGAR (connected between GAR and QR) and CGARS (connected between GAR and VEE) ensure stability.
The CGAR capacitor provides a first-order low-pass filter. The cut-off frequency corresponds to the time constant
CGAR × (RGARint // RGAR). RGARint is the internal resistor which sets the gain with a typical value of 100 kΩ. The
condition CGARS = 10 × CGAR must be fulfilled to ensure stability.
Automatic gain control is provided on this amplifier for line loss compensation.
handbook, full pagewidth |
Rline |
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RCC |
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Iline |
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619 Ω |
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TEA1118 |
LN |
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VCC |
Ip |
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from preamp |
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TEA1118A |
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ICC |
CVCC |
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Rexch |
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Ish |
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I* |
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100 μF |
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peripheral |
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circuits |
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Vexch |
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SLPE |
REG |
VEE |
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ISLPE |
RSLPE |
CREG |
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20 |
Ω |
4.7 μF |
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MBH274 |
Fig.7 Supply configuration.
1997 Jul 14 |
8 |
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