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PDF TCA3388 Data sheet ( Hoja de datos )

Número de pieza TCA3388
Descripción TELEPHONE LINE INTERFACE
Fabricantes Motorola Semiconductors 
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TCA3388
Advance Information
Telephone Line Interface
The TCA3388 is a telephone line interface circuit which performs the basic
functions of a telephone set in combination with a microcontroller and a ringer.
It includes dc and ac line termination, the hybrid function with 2 adjustable
sidetone networks, handset connections and an efficient supply point.
TELEPHONE LINE
INTERFACE
SEMICONDUCTOR
TECHNICAL DATA
FEATURES
Line Driver and Supply
DC and AC Termination of the Telephone Line
Selectable DC Mask: France, U.K., Low Voltage
Current Protection
Adjustable Set Impedance for Resistive and Complex Termination
Efficient Supply Point for Peripherals
Hook Status Detection
Handset Operation
Transmit and Receive Amplifiers
Double Anti–Sidetone Network
Line Length AGC
Microphone and Earpiece Mute
Transmit Amplifier Soft Clipping
Dialing and Ringing
Interrupter Driver for Pulse–Dialing
Reduced Current Consumption During Pulse–Dialing
DTMF Interfacing
Ringing via External Ringer
Application Areas
Corded Telephony
Cordless Telephony Base Station
Answering Machines
Fax
Intercom
Modem
20
1
DP SUFFIX
PLASTIC PACKAGE
CASE 738
20
1
FP SUFFIX
PLASTIC PACKAGE
CASE 751D
PIN CONNECTIONS
RXI 1
TXI 2
Mic 3
LAO 4
LAI 5
HYL 6
HYS 7
CM 8
IMP 9
SAO 10
20 RXO2
19 RXO1
18 Gnd
17 VCC
16 Iref
15 MUT
14 PI
13 HSO
12 DCM
11 SAI
(Top View)
ORDERING INFORMATION
Device
Tested Operating
Temperature Range
Package
TCA3388DP
TCA3388FP TA = 0° to +70°C
DIP
SOIC
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1995
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TCA3388 pdf
TCA3388
AC ELECTRICAL CHARACTERISTICS (continued) (TA = 25°C)
Characteristic
Symbol Min Typ Max Unit
ÁÁÁÁDLISoTwÁÁTrOaVnRosÁÁTltmaIOgiteNÁÁ(I2 =ÁÁ10 µÁÁA) ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTHÁÁDTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3.0ÁÁÁÁÁÁ% ÁÁ
Receive (I2 = 6.0 µA)
VE = 700 mV
THDR
– 3.0
VE = 1250 mV
– – 5.0
NOTE: VE is the differential earpiece voltage across Pins 19 and 20.
TYPICAL TEMPERATURE PERFORMANCE
Characteristic
Typical Value @ 25°C
Typical Change – 20 to + 60°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVCC RegulatedSupply@Pin17
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCurrent Consumption at Pin 17, Pin PI = High
3.7
400 µA
– 0.8 mV/°C
– 0.55 µA/°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁAmplifier A8 Driver Slope
1.0 µA/mV
– 0.0035 µA/mV/°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVoltage on SAI
VC French = 0.47 Vdc
U.K. = 0.70 Vdc
VD French = 0.49 Vdc
U.K. = 0.72 Vdc
0.35 mV/°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInternal Slope for Low VoltageMode
125 mV/µA
0.07 mV/µA/°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTransmit Gain Kµ0
12.5 dB
0.01 dB/°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLine Length Regulation Kµ
French
U.K.
L.V.
6.5 dB
6.5 dB
6.0 dB
< 0.3 dB Variation
< 0.3 dB Variation
– 0.05 dB/°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInternal Transconductance Ge0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLine Length Regulation Ge
French
U.K.
L.V.
180 µA/V
3.7 dB
3.5 dB
5.7 dB
< 1.0 dB Variation
< 0.5 dB Variation
< 0.5 dB Variation
– 0.04 dB/°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁNOTE: Temperature data is typical performance only, based on sample characterization, and does not provide guaranteed limits over temperature.
PIN FUNCTION DESCRIPTION
Pin Symbol
Description
1 RXI Earphone Amplifier Input
2 TXI Microphone Amplifier Input
3 Mic Microphone Bias Current Sink
4
LAO
Line Driver Amplifier Output
5 LAI Line Driver Amplifier Input
6 HYL Hybrid Network Input for Long Lines
7
HYS
Hybrid Network Input for Short Lines
8 CM DC Mask Signal Filtering
9 IMP Reference Voltage
10
SAO
Line Current Sense Amplifier Output
11 SAI Line Current Sense Amplifier Input
12
DCM
DC Mask Select
13
HSO
Hook Status Output, PABX Mode Select
14 PI Pulse Input
15
MUT
Mute Input
16 Iref Reference Current
17
VCC
Supply Voltage
18 Gnd Ground
19
RXO1
Earphone Amplifier Output
20
RXO2
Earphone Amplifier Inverted Output
MOTOROLA ANALOG IC DEVICE DATA
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TCA3388 arduino
TCA3388
factor m. The relation between the line current and the factor
m is depicted in Figure 11.
Figure 11. Modulation Factor m as a Function
of Line Current
m
1.0
0.5
ILine
0 ILstart ILm ILstop
For low line currents below ILstart, thus long lines, the
factor m equals 1. This means the hybrid network ZHL is fully
used. For high line currents above ILstop, thus short lines, the
factor m equals 0. This means the hybrid network ZHS is fully
used. Both networks are used 50% for the intermediate line
current Ilm.
The switch over between the 2 networks takes place in
region 3 for the French and U.K. mask and in region 2 for the
Low Voltage mask.
LINE LENGTH AGC
The TCA3388 offers the possibility to vary the transmit and
receive gain over line length in order to compensate for the
loss in gain at longer line lengths. In the block diagrams of the
transmit and receive channels (Figures 9, 10) the line AGC is
drawn. The line AGC can be switched off by connecting a
150 kresistor between HSO and Gnd. In this case, the
transmit and receive gain are lowered by 2.0 dB with respect
to the value calculated in the formulas above.
The line AGC characteristics for both transmit and receive
channel have the general shape depicted in Figure 12.
Figure 12. General Line AGC Characteristics
Gain
Nominal
Gain
+Gain Nominal Gain
)1
IL – ILstart
ILrange
Reduced
Gain
ILstart ILrange
ILine
For low line currents, and thus long lines, the gains are
nominal. When the line current has increased above ILstart
with a current ILrange, the gain is reduced by 6.0 dB. Due to
the general characteristics of the line AGC curve, the gain will
be decreased further for higher currents.
For France and U.K., the line AGC will be active in region
3 of the dc characteristics. The ILstart is approximately equal
to the ILK. The range is calculated from:
+ILrange
Z1 x (I2R – I2CD)
RE3
For Low Voltage mask, the line AGC is active in region 2.
DIALING
Pulse–dialing is performed by making pin PI high. As a
result the output LAO goes low and the loop will be
disconnected. Internally the current consumption of the
circuit is reduced and the current through the microphone is
switched off.
DTMF–dialing is performed by supplying a DTMF signal
current to Pin LAI. This is the same node where the
microphone signal currents are internally applied. Therefore,
for the DTMF gain the same formulas apply. Because the
microphone preamplifier is bypassed, there is no influence
on DTMF signals by the line length AGC.
A DTMF confidence tone can be generated on the
earpiece by injecting a signal current at the RXI pin. Because
only the earpiece amplifier itself is used, there are no effects
from AGC or hybrid switchover.
For correct DTMF–dialing the pin MUT has to be made
high. This mutes both the microphone and earphone
preamplifier. In this way signals from the microphone will not
be amplified to the line and signals from the line are not
amplified to the earpiece.
The complete interfacing of the DTMF generator with the
TCA3388 is shown in the typical application.
SUPPORT MATERIAL
Device Specification: Brief description of the TCA3388,
block diagram, device data, test
diagram, typical application
User manual TCA3388: Extended description of the circuit
and its concept, adjustment
procedure, application hints and
proposals
Demonstration board: Shows performance of the TCA3388
in its basic application
TYPICAL APPLICATION
The typical application below is based on the demoboard
of the TCA3388. It contains the speech transmission part,
diode bridge, hook switch and microcontroller interfacing.
The dc mask setting on the bottom left is given for France,
U.K. and Low Voltage applications. The component values
are given in the table of Figure 14. The line driver is extended
with T1, D5 and R3 which increases the signal swing under
low line voltage conditions.
MOTOROLA ANALOG IC DEVICE DATA
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