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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
20 1
Handset Operation * Transmit and Receive Amplifiers Double Anti-Sidetone Network Line Length AGC Microphone and Earpiece Mute Transmit Amplifier Soft Clipping
DP SUFFIX PLASTIC PACKAGE CASE 738
20 1
Dialing and Ringing * Interrupter Driver for Pulse-Dialing Reduced Current Consumption During Pulse-Dialing DTMF Interfacing Ringing via External Ringer
RXI TXI Mic LAO LAI HYL HYS CM
FP SUFFIX PLASTIC PACKAGE CASE 751D
PIN CONNECTIONS
1 2 3 4 5 6 7 8 9 20 RXO2 19 RXO1 18 Gnd 17 VCC 16 Iref 15 MUT 14 PI 13 HSO 12 DCM 11 SAI (Top View)
Application Areas * Corded Telephony Cordless Telephony Base Station Answering Machines Fax Intercom Modem
IMP SAO 10
ORDERING INFORMATION
Device TCA3388DP TCA3388FP TA = 0 to +70C Tested Operating Temperature Range Package DIP SOIC
This document contains information on a new product. Specifications and information herein are subject to change without notice.
(c) Motorola, Inc. 1995
MOTOROLA ANALOG IC DEVICE DATA
1
TCA3388
Simplified Block Diagram
Line + DC and AC Termination
Handset Earpiece
Ear
DC Mask Generation AC Termination 2-4 Wire Conversion
Supply Stabilizer
Handset MIcrophone
Mic Microcontroller Interface
Line Driver
Line - This device contains 1,911 active transistors.
MAXIMUM RATINGS
Rating Maximum Junction Temperature Storage Temperature Range
NOTE:
Symbol TJ Tstg
Min - - 65
Max +150 +150
Unit C C
Devices should not be operated at or outside these values. The "Recommended Operating Limits" provide for actual device operation.
RECOMMENDED OPERATING CONDITIONS
Characteristic Operating Temperature Range Symbol TA Min 0 Typ - Max +70 Unit C
DC ELECTRICAL CHARACTERISTICS (TA = 25C)
Characteristic VOLTAGE REGULATOR Regulated Supply at Pin 17 ICC = 7.0 mA ICC = 20 mA ICC = 80 mA Current Consumption at Pin 17, Pin PI = High DRIVER DC CHARACTERISTICS Available Current at LAO Source Current Sink Current VCC 3.4 3.45 3.5 ICC - 3.7 3.75 3.8 - 4.0 4.05 4.1 600 A A Vdc Symbol Min Typ Max Unit
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I4 45 -100 0.7 - 70 -70 1.0 - 100 - 45 1.2 Amplifier A8 Driver Slope S8 A/mV mV mV LAO Voltage (PI = High, I4 = 100 A) Internal Offset (Pins 5 to 10) VLAO 270 140 VO1-VO2 30 80 SPEECH AMPLIFIERS IMP Voltage (Pin 9, Closed Loop) VIMP - - - - - 1.6 - Vdc Vdc Earpiece Amplifier DC Bias (Rext = 100 k) RXI, Pin 1 RXO1 Pin 19 RXO2, Pin 20 Offset (VRXO1 - VRXO2) VRXI VRXO1 VRXO2 VOffset 1.6 1.7 1.45 0.25 - - - 0.70
2
MOTOROLA ANALOG IC DEVICE DATA
TCA3388
DC ELECTRICAL CHARACTERISTICS (continued) (TA = 25C)
Characteristic SPEECH AMPLIFIERS Symbol Min Typ Max Unit
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HYL and HYS DC Bias Voltage Normal Mode PI = High Vdc VHY1 VHY2 VTXI VMic - - - - - 2.4 1.4 - - - Microphone Amplifier DC Bias at TXI Saturation Voltage at Mic @ 1.0 mA Leakage Current into Mic @ 3.7 V 1.45 250 - Vdc mV A 300 2.0 ILeak HOOK STATUS OUTPUT (Pin 13) High Level Voltage @ - 5.0 A Load Current, Off-Hook, VSAI = Max Maximum Load Current Normal Mode PABX Mode VHSOH IHSOL IHSOH 2.7 - 20 2.9 - - - Vdc A 5.0 - Low Level Voltage @ + 5.0 A Load Current, VSAI = - 5.0 mV Normal On-Hook PI = High Time Delay from On-Hook or Off-Hook Vdc VHSOL VHSOLPI TDel - 2.7 - - 2.9 3.5 0.60 - - ms PULSE INPUT (Pin 14) Input Impedance DC Bias Voltage Input Current Make Phase Break Phase ZPI - - 160 1.4 - - - - k VPIL IPIL IPIH ZMI Vdc A -1.0 -10 1.0 10 MUTE INPUT (Pin 15) Input Impedance DC Bias Voltage Input Current Speech Mode Mute Mode - - 160 1.4 - - - - k VMI Vdc A IMIL IMIH -1.0 -10 1.0 10 DC MASK CHARACTERISTICS French Internal Slope Voltage on SAI (I2C = 3.6 A) Voltage on SAI (I2D = 4.0 A) Delta Offset Voltage on SAI (I2E = 30 A) U.K. Internal Slope Voltage on SAI (I2C = 3.5 A) Voltage on SAI (I2D = 3.9 A) Delta Offset Voltage on SAI (I2E = 30 A) Low Voltage Mode Internal Slope Voltage on SAI (I2C = 13 A) Voltage on SAI (I2D = 15 A) Delta Offset Voltage on SAI (I2E = 20 A) RI VC VD VE-VD RI VC VD VE-VD RI VC VD VE-VD 120 0.40 - - 210 0.59 - - 100 1.0 - - 530 280 350 280 160 0.47 0.49 - 260 0.70 0.72 20 125 1.2 1.3 - 580 - - - 200 - 0.57 30 310 - 0.83 50 150 - 1.55 100 650 385 440 440 mV/A Vdc Vdc mV mV/A Vdc Vdc mV mV/A Vdc Vdc mV mV Overvoltage Protection Threshold (VLAI - VSAO) French and U.K. DC Masks Low Voltage DC Mask Protection Voltage Level (VLAI - VSAO) French and U.K. DC Masks Low Voltage DC Mask VClamp1 VClamp2 mV
MOTOROLA ANALOG IC DEVICE DATA
3
TCA3388
AC ELECTRICAL CHARACTERISTICS (TA = 25C)
Characteristic TRANSMIT MODE Symbol Min Typ Max Unit
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French and U.K. Maximum Transmit Gain (I2 = 3.0 A) Line Length Regulation (I2 = 30 A) Gain in Protection Mode (I2 = 30 A) Low Voltage Mode Maximum Transmit Gain (I2 = 3.0 A) Line Length Regulation (I2 = 8.2 A) Gain in Protection Mode (I2 = 8.2 A) dB K0 K Kp K0 K Kp 11.25 5.5 10.5 11.25 4.5 10.5 60 12.5 6.5 12.5 12.5 6.0 12.5 - 13.75 7.5 14.5 13.75 7.5 14.5 - dB Gain Reduction when Microphone is Muted Km dB RECEIVE MODE French Maximum Internal Transconductance (I2 = 3.0 A) Line Length Regulation (I2 = 18 A) Hybrid Weighting Factor (I2 = 18 A) Line Length Regulation (HYS @ VCC, I2 = 9.0 A) Protection Mode (I2 = 18 A) U.K. Maximum Internal Transconductance (I2 = 3.0 A) Line Length Regulation (I2 = 18 A) Hybrid Weighting Factor (I2 = 13 A) Line Length Regulation (HYS @ VCC, I2 = 9.0 A) Protection Mode (I2 = 18 A) Low Voltage Mode Maximum Internal Transconductance (I2 = 3.0 A) Line Length Regulation (I2 = 8.0 A) Hybrid Weighting Factor (I2 = 7.0 A) Line Length Regulation (HYS @ VCC, I2 = 4.0 A) Protection Mode (I2 = 8.0 A) Earpiece Gain Reduction when Muted Ge0 Ge mr Ge Gep Ge0 Ge mr Ge Gep Ge0 Ge mr Ge Gep 150 2.95 0.4 1.5 145 150 2.8 0.4 1.4 145 150 4.2 - - 145 60 180 3.7 0.5 2.1 185 180 3.5 0.5 1.9 185 185 5.7 0.5 3.0 185 - 210 4.45 0.6 2.5 230 210 4.3 0.6 2.4 230 210 7.2 - - 230 - A/V dB dB A/V A/V dB dB A/V A/V dB dB A/V dB
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Gem TRANSMIT PABX MODE French and U.K. Transmit Gain (I2 = 3.0 A) Variation with Line Length (I2 = 30 A) Low Voltage Mode Transmit Gain (I2 = 3.0 A) Variation with Line Length (I2 = 30 A) dB KPABX KPABX KPABX KPABX 9.25 - 0.5 9.25 - 0.5 10.5 - 10.5 - 11.75 0.5 11.75 0.5 dB RECEIVE PABX MODE French Internal Transconductance (I2 = 5.0 A) Hybrid Weighting Factor (I2 = 5.0 A) Variation with Line Length (I2 = 30 A) U.K. Internal Transconductance (I2 = 5.0 A) Hybrid Weighting Factor (I2 = 5.0 A) Variation with Line Length (I2 = 30 A) Low Voltage Mode Internal Transconductance (I2 = 3.0 A) Hybrid Weighting Factor (I2 = 3.0 A) Variation with Line Length (I2 = 30 A) GPABX mr GPABX GPABX mr GPABX GPABX mr GPABX 120 0.8 - 0.5 120 0.65 - 0.5 120 - - 0.5 145 0.9 - 170 1.0 0.5 A/V dB 145 0.75 - 145 0.9 - 170 0.85 0.5 170 - 0.5 A/V dB A/V dB DISTORTION French Transmit (I2 = 10 A) Receive (I2 = 6.0 A) % VE = 700 mV VE = 1250 mV THDT THDR - - - - - - 3.0 3.0 5.0
NOTE: VE is the differential earpiece voltage across Pins 19 and 20.
4
MOTOROLA ANALOG IC DEVICE DATA
TCA3388
AC ELECTRICAL CHARACTERISTICS (continued) (TA = 25C)
Characteristic DISTORTION Symbol Min Typ Max Unit
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VCC Regulated Supply @ Pin 17 3.7 - 0.8 mV/C Current Consumption at Pin 17, Pin PI = High Amplifier A8 Driver Slope Voltage on SAI 400 A - 0.55 A/C 1.0 A/mV - 0.0035 A/mV/C 0.35 mV/C VC VD French = 0.47 Vdc U.K. = 0.70 Vdc French = 0.49 Vdc U.K. = 0.72 Vdc 125 mV/A 12.5 dB 6.5 dB 6.5 dB 6.0 dB Internal Slope for Low Voltage Mode Transmit Gain K0 0.07 mV/A/C 0.01 dB/C Line Length Regulation K French U.K. L.V. < 0.3 dB Variation < 0.3 dB Variation - 0.05 dB/C < 1.0 dB Variation < 0.5 dB Variation < 0.5 dB Variation - 0.04 dB/C Internal Transconductance Ge0 Line Length Regulation Ge 180 A/V 3.7 dB 3.5 dB 5.7 dB French U.K. L.V.
NOTE: Temperature data is typical performance only, based on sample characterization, and does not provide guaranteed limits over temperature.
AAA A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A
Low Voltage Transmit (I2 = 10 A) Receive (I2 = 6.0 A) % VE = 700 mV VE = 1250 mV THDT THDR - - - - - - 3.0 3.0 5.0
NOTE: VE is the differential earpiece voltage across Pins 19 and 20.
TYPICAL TEMPERATURE PERFORMANCE
Characteristic Typical Value @ 25C Typical Change - 20 to + 60C
PIN FUNCTION DESCRIPTION
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Symbol RXI TXI Mic LAO LAI HYL HYS CM IMP SAO SAI DCM HSO PI MUT Iref VCC Gnd RXO1 RXO2 Earphone Amplifier Input Microphone Amplifier Input Microphone Bias Current Sink Line Driver Amplifier Output Line Driver Amplifier Input
Description
Hybrid Network Input for Long Lines Hybrid Network Input for Short Lines DC Mask Signal Filtering Reference Voltage Line Current Sense Amplifier Output Line Current Sense Amplifier Input DC Mask Select Hook Status Output, PABX Mode Select Pulse Input Mute Input Reference Current Supply Voltage Ground Earphone Amplifier Output Earphone Amplifier Inverted Output
MOTOROLA ANALOG IC DEVICE DATA
5
TCA3388
DESCRIPTION OF THE CIRCUIT
Concept With a TCA3388, a microcontroller and a ringer, a basic telephone set can be built according to the concept depicted in Figure 1. In off-hook position, the application is in speech mode. The line current flows through transistor T2 and supplies the externals (microcontroller) at the supply point VCC which is stabilized by the TCA3388. The Vline, Iline characteristic is adjusted by the external components Z0, Z1, Z21 and R1 which are in a regulator loop, acting on transistor T2. The ac impedance is generated in a similar way. The handset can be connected directly to the TCA3388. Via a logic level interface, the microcontroller drives the TCA3388 to perform the DTMF/pulse-dialing. The user keyboard has to be connected to the microcontroller. In on-hook position, a ringing melody can be generated with a ringer application. The block diagram of the TCA3388, in Figure 2, shows the basic blocks of the device plus the essential external components.
Figure 1. Telephone Concept with TCA3388
Hookswitch
Z1 Z21
Z0
T2 VCC
A/B
Ringer Handset
TCA3388
Micro
R1
Gnd
Figure 2. Block Diagram of the TCA3388 with Essential Components
Line + Z2 Z1 R20 6 HYS C20 RXO1 19 RXO2 R6 20 RXI C5 1 TXI 2 Mic Mic 3 TCA3388 SAI 11 12 ZDCM Line - R1 DCM 13 R22 HSO 14 PI MUT 15 Micro-Interface Hook-Detect PABX Line Driver Ear Mute, AGC Mute, AGC LAO 4 T3 DC Mask Generation AC Termination 2-4 Wire Conversion Line Length AGC Protection Supply- Stabilizer References HYL 8 CM 10 SAO Z0 Z21 5 LAI DTMF 9 R12 16 IMP Iref T2 VCC 17 Gnd 18
C17 R19
C16
7
C7
R9
To/From Microcontroller
6
MOTOROLA ANALOG IC DEVICE DATA
TCA3388
DC CHARACTERISTICS AND STARTUP
The dc mask has the general form as depicted in Figure 3. The TCA3388 offers the possibility to adjust the dc characteristics of all 4 regions via mask selection and hardware adjustments. The selection of the 3 masks, France, United Kingdom and Low Voltage, can be done via the ZDCM network at Pin DCM as shown in Figure 4. For French and U.K. masks, the region 3 with the high slope is within the normal dc feeding conditions. For Low Voltage mask the region 3 will be outside this and the dc mask is mainly determined by regions 1 and 2. Figure 3. General Form of the DC Mask of the TCA3388
VLine DCM 4 VLP R24 47 k C21 10 R25 1.0 M C18 470 n ZDCM for the L.V., U.K. and FR Mask VCC R23 56 k DCM DCM
Figure 4. Selection of the Country Mask via Pin DCM
I DCM ( A) FR 14 11 LV 4 V (V) DCM U.K.
0
0.5
2.0
2.5
3.0 3.2
3 VLK VLC 1 0 ILC Region 1: Region 2: Region 3: Region 4: ILP ILK IVLP ILine 2 L.V.
U.K.
FR
Startup, Low Line Current, High Slope Mid-Range Line Current, Low Slope High Line Current, High Slope Overload Protection
The capacitor in the U.K. network is to ensure a stable selection of the mask during all working modes and transitions. The capacitor in the French network is used to create a startup in Low Voltage Mask. The adjustment possibilities will be discussed below with the aid of the block diagram of Figure 5.
Figure 5. DC Part of the Block Diagram of the TCA3388
Line + C16 Z2 Z1 1.6 V I2 L HYL G I2 S HYS CM SAI Line - G RX VO1 TCA3388 VO2 R1 SAO Gnd CM 2 VBE Z21 LAI LAO T3 C7 Z0 R5 VCC IMP T2
MOTOROLA ANALOG IC DEVICE DATA
7
TCA3388
The TCA3388 offers the possibility to connect 2 sidetone networks Z1 and Z2. For correct dc operation, the dc impedance of these networks must be equal. When only 1 sidetone network is used, Pin HYS has to be connected to HYL. All formulas below are based on a single sidetone network, so only Z1 appears. When 2 sidetone networks are used, Z1 has to be replaced by Z1//Z2. In region 1, the transfer of the amplifier G at the HYL/HYS inputs equals zero. The voltage difference between SAO and SAI will equal VO1. The slope RE1 of the VLine, ILine characteristic will equal: R E1 Z0 + R1 x 1 ) Z21 When the line voltage becomes lower than VLP, the overload condition is removed and the TCA3388 will leave region 4. The current drawn from the line by the dc part is used to supply the TCA3388 and peripheral circuits. The excess loop current is absorbed by the voltage regulator at Pin VCC, where a filter capacitor is connected. The reference for the circuit is Pin Gnd. Startup of the application is ensured by an internal startup circuit. When the line current flows, the hook status output pin HSO goes high. This informs the microcontroller that the set is off-hook. When the line current is no longer present the pin will go low again. Because the line current is monitored, and not the line voltage, also an interrupt of the exchange can be recognized.
In region 2, the output current of the amplifier G will be proportional to the input current. As a result the voltage between SAO and SAI will increase with the line voltage. Speech signals on the line are of no influence on this because they are filtered out via capacitor C16. The slope RE2 of the VLine, ILine characteristic will equal:
AC CHARACTERISTICS
Impedance In Figure 6, the block diagram of the TCA3388 performing the ac impedance is depicted. As can be seen it is partly common with the dc mask block diagram. The part generating the dc mask is replaced by a dc voltage source because for ac, this part has no influence.
R
E2
+ R1 x
1
) RI
Z1
) Z21 Z0
Figure 6. AC Stage of the TCA3388
Line + T2
1
In region 3, the output current of the amplifier G is kept constant. As a result the slope in region 3 will equal the slope of region 1. The transfer from region 2 to 3 occurs at the point VLK, ILK defined by: VLK = Z1 x I2CD + 2 VBE + VCD + VO2 I
Z0 TCA3388 LAI Z21 SAO VO1 SAI Line - V02 R1 Gnd LAO
R5 VCC T3 C7
LK
+
Z21 x Z1 x I2CD 2V BE Z0 R1
)
) VCD
With: I2CD and 2 VBE
1.4 V, V02 1.1 V
+ I2C ) I2D , 2
and V
+ VC ) VD , CD 2
When the French or U.K. mask is selected, this transfer takes places for line currents of 30 mA to 40 mA depending on the components settings. With the Startup and Low Voltage mask, the transfer lies outside the normal operating range with line currents of 90 mA or more. In most applications the transfer from region 1 to 2 takes place for line currents below 10 mA. With proper settings, region 4 is entered only during an overload condition. In this mode, the power consumption in the telephone set is limited. In order to detect an overload condition, the voltage between the Pins LAI and SAO is monitored. When the voltage difference is larger than the threshold VClamp1, the protection is made active. The relation for the line voltage VLP at this point is given as: V LP Z0 + Z21 xV Clamp1
When calculating the ac loop, it can be derived that the set impedance Zin equals Z0 Z0 + VLine + R1 1 ) Z21 [ R1 x Z21 I Line
Z
in
) VCD ) VO2
When the protection mode is entered, the line current is reduced to a lower value ILP of: I 8
+ LP
V
Clamp2
) (VO1 - VO2)
R1
As can be noticed, the formula for the ac impedance Zin equals the formula for the dc slope in regions 1 and 3. However, because for the dc slope the resistive part of Z0 and Z21 are used, the actual values for Zin and the dc slopes do not have to be equal. A complex impedance can be made by making either Z0 or Z21 complex. When Z0 is made complex to fit the set impedance the transmit characteristics will be complex as well. The complex impedance is therefore preferably made via the Z21 network. Because Z21 is in the denominator of the Zin formula, Z21 will not be a direct copy of the required impedance but a derivative of it. Figure 7 gives this derived network to be used for Z21. MOTOROLA ANALOG IC DEVICE DATA
TCA3388
Figure 7. Derived Network for Z21 in Case of Complex Set Impedance
Rv SAO Ra Rw R Mic Rb Cb Cw C Mic Ru Gnd Rv Cu TXI Iu RTXI Ku Line AGC VCC TCA3388 Rv LAI
The microphone signal current is derived from the microphone signal according to the schematic in Figure 9.
Figure 9. Microphone Amplifier Input Stage
+
ILAI
R1 x Z0 2 Ra
) Rb - R1
Ra
Handset Microphone
Mic Mute
Rw
+4 R
+
4R
R1 x Z0 R a - R1 b 2
) Rb - R1
b
Cw
b
xC
R1 x Z0
TRANSMIT
When a current is injected on Pin LAI, via the loop depicted in Figure 6, a signal is created on the line. In this way the microphone signals and DTMF signals (from an external source) are transmitted. It can be derived that the signal voltage on the line (VLine) depends on the signal current injected in LAI (ILAI) according to: V Line
The input stage of Figure 9 consists of a current amplifier with transfer Ku, an input impedance of 1.0 k (RTXI), plus an attenuator which reduces the signal current at high line currents (AGC). This attenuator can be switched on/off via the microcontroller. The input current Iu within the telephony speech band is derived from the microphone signal according Iu
+R
Vu Vu ) Ru ) RTXI [ Ru Mic
With: Vu = signal of the microphone only loaded with RMic The overall gain from microphone to line (ATX) now follows as A Line + VV u + TX Z0 x Z Ku x Line Ru Z Z in Line
+ -ILAI x Z ) ZLine in Line
Z0 x Z
With this relation, a simplified replacement circuit can be made for the transmit amplifier (see Figure 8). Here the product of ILAI and Z0 is replaced by one voltage source. Figure 8. Replacement Diagram for the Transmit Amplifier
Zin
)
-I LAI*Z0
VLine
Practically, the gain can be varied only with Z0, Ru and RMic. The TCA3388 offers the possibility to mute the microphone, also called privacy mode, by making the MUT Pin high. During pulse-dialing, the microphone bias is switched off. Pin Mic will be made high impedance, shutting off the microphone dc current. This reduces the current consumption of the circuit during pulse-dialing.
ZLine
MOTOROLA ANALOG IC DEVICE DATA
9
TCA3388
Figure 10. Receive Part of the TCA3388
Z1 Line + R20 C17 Z2 HYS R19 HYL IMP TCA3388 1.6 V Ge Vref RXO1 RLoad 2V BE + V01 SAI R1 Line - Ge Line Mute AGC Gnd RXI CLoad Handset Earpiece -1X RXO2 Cear
RECEIVE
The receive part of the TCA3388 is shown in Figure 10. The receive signal is picked up by the amplifiers at the HYL/HYS inputs. These are the same amplifiers present in the dc loop of Figure 5. The signal is first converted to current by the transconductance amplifier with transfer Ge. The multiplier placed after performs the line length AGC. It switches over between the 2 signals at HYS and HYL according to the line current via a modulation factor m. Afterwards, the current is converted back to voltage via the external feedback network ZLoad. The resulting voltage is available at output RXO1, and inverted at RXO2. From the diagram of Figure 10 the receive gain (ARX) can be derived as:
SIDETONE
When a transmit signal is transmitted to the line, a part of the signal is returned to the receive channel due to the architecture of the 2 to 4 wire conversion of the hybrid. During transmit, the signal on the line will be -ILine x ZLine. During receive, the signal on the line will be ILine x Zin. When replacing Zin in the formula for the receive gain, it follows that the signal on the earpiece output due to a sending signal on the line will be: V ear V Line (transmit)
+ Ge x R1 x ZLoad
x
1- 1 Z Z Line H
In applications with 1 sidetone network where HYS is connected to HYL, it follows: 1 Z H
A
RX
+ VRXO + Ge x R1 x ZLoad V
Line
x
1 Z H
) Z1
in
+ R1R20Z1 + Z 1 x
HL
1 With: Z H
+ R1R20Z1 x
in case of 1 sidetone network and
HYS connected to HYL, or 1 Z H
+ m x R1R20Z1 ) (m -1) R1R19Z2 x x
in case of
ZH has to be chosen according the average line impedance, and the average linelength of the countries involved in the application. A complex sidetone network can be made via a complex Z1 which is preferred above making R20 complex. The coupling capacitor C17 in series with R20 is meant only to block dc. For applications with 2 sidetone networks it follows: 1 Z H
2 sidetone networks More information on ZH and the modulation factor m can be found under the sidetone characteristics. The earpiece can either be connected as a single ended or as a differential load. The above calculated gain is valid for the single ended case. When connecting as a differential load, the gain is increased by 6.0 dB. The TCA3388 offers the possibility to mute the signal coming from the line to the earpiece. This can be useful during pulse- and DTMF-dialing. 10
+ m R1R20Z1 ) (m -1) R1R19Z2 + x x m 1 ) (m - 1) 1 Z Z
HL HS
The ZH thus exists as ZHL for long lines with low line currents and as ZHS for short lines with high line currents. This can be useful in applications such as DECT and handsfree where the sidetone has to be minimized to reduce the effect of delayed echoing and howling respectively. The TCA3388 will automatically switch over between the 2 hybrid networks as a function of line current. This is expressed in the MOTOROLA ANALOG IC DEVICE DATA
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
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: Z1 x (I2R - I2CD) I Lrange R E3 For Low Voltage mask, the line AGC is active in region 2.
+
0.5
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.
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 k resistor 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 Gain Nominal Gain
SUPPORT MATERIAL
Device Specification: Brief description of the TCA3388, block diagram, device data, test diagram, typical application
+
Nominal Gain I -I L Lstart 1 I Lrange
)
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
Reduced Gain
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.
ILine ILstart ILrange
For low line currents, and thus long lines, the gains are nominal. When the line current has increased above ILstart
MOTOROLA ANALOG IC DEVICE DATA
11
Figure 13. Typical Application
12
C13 R15 C11 R28 R16 Z1 Z21 T1 D5 C16 R29 R20 C14 C25 C24 R1 Line Driver C8 C4 11 Transmit Gain 20 R9 TCA3387 TCA3388 TCA3389 C5 C6 10 1 R7 C2 C17 T3 D3 D4 Z0 R13 R5 R3 D1 D2 Long Line C23 R21 C10 R14 T2 Rp On-Hook Off-Hook C1 Z1 R26 R23 C22 R12 C26 R24 PABX R22 C7 C19 C20 C3 R27 R6 Receive Gain
C12
R18
Line + Ring
Z2
R17
Short Line
A/B
R19
C15
B/A
Line-
Sidetone Balance
R11
TCA3388
VMic
DTMF
DTMF Gain
R8
Mic + Mic - Ear + Ear -
HSO Pulse Mute
VCC
FR
LV
UK
R25
C18
C21
Gnd
Gnd
MOTOROLA ANALOG IC DEVICE DATA
Mask Setting
TCA3388
Figure 14. List of Components for Typical Application TCA3388
Item R1 R3 R5 R6 R7 R8 R9 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 Rp C1 C2 C3 C4 C5 C6 C7 C8 C10 C11 C12 C13 C14 C15 C16 C17 Location on Board Line Driver Line Driver Line Driver Receive Gain Transmit Gain DTMF Gain Transmit Gain DTMF Gain Iref, Pin 16 Z0 Z0 Z1 Z1 Z2 Z2 Sidetone Bal Sidetone Bal Z21 PABX Mask Setting Mask Setting Mask Setting Pin 19 Pin 20 Z21 Transmit Gain Line+ A/B Line Driver Receive Gain DTMF Gain Transmit Gain Transmit Gain Pin 17 DTMF Gain Z0 Z1 Z2 Z21 Sidetone Bal Sidetone Bal Pin 8 Sidetone Bal - 680 n - 220 p - 0 - - - 580 k - 620 k 130 k - - - 7.5 k 16 k Application Basic L.V. 16 France 16 10 k 1.0 k 150 k 2.2 k 470 k 39 k 56 k 121 k 560 k 680 k 1.2 m 300 k 620 k 820 k 18 k 15 k 16 k 150 k - - 1.0 m 10 10 0 1.0 k 22 10 n 470 p 220 p 10 n 10 n 6.8 n 220 10 n 4.7 n 120 p 82 p 470 p 470 p 470 p 680 n 680 n 470 p 2.2 Stability Stability DC Mask 330 p 150 p 150 p VCC, 10 V 22 EMC VMic 56 k 47 k - Stability Stability 330 k 620 k 1.8 m 330 k 820 k 1.5 m 39 k 22 k 18 k 1.0% U.K. 18 Remarks
MOTOROLA ANALOG IC DEVICE DATA
13
TCA3388
Figure 14. List of Components for Typical Application TCA3388
Item C18 C19 C20 C21 C22 C23 C24 C25 C26 T1 T2 T3 D1-D4 D5 Z1 Location on Board Mask Setting Pin 19 Pin 20 Mask Setting Pin 17 Z21 Transmit Gain Pin 2 Pin 16 Line Driver Line Driver Line Driver Bridge Line Driver A/B - Application Basic L.V. - France 470 n 100 n 100 n - 100 n - 10 4.7 n 1.0 n MPSA92 MJE350 MPSA42 4 x 1N4004 1N4004 MKP1V270 VMic, 10 V EMC EMC PNP-HV PNP-HV NPN-HV HV Signal Sidac 10 U.K. - Stability Stability 10 V Close to Pin Remarks
14
MOTOROLA ANALOG IC DEVICE DATA
TCA3388
OUTLINE DIMENSIONS
DP SUFFIX PLASTIC PACKAGE CASE 738-03 ISSUE E -A20 11 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. DIM A B C D E F G J K L M N INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 15 0 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0 15 1.01 0.51
B
1 10
C
L
-TSEATING PLANE
K M E G F D 20 PL 0.25 (0.010)
M
N J 20 PL 0.25 (0.010) TA
M
M
T
B
M
FP SUFFIX PLASTIC PACKAGE CASE 751D-03 ISSUE E
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.150 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A B C D F G J K M P R MILLIMETERS MIN MAX 12.65 12.95 7.40 7.60 2.35 2.65 0.35 0.49 0.50 0.90 1.27 BSC 0.25 0.32 0.10 0.25 0_ 7_ 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.499 0.510 0.292 0.299 0.093 0.104 0.014 0.019 0.020 0.035 0.050 BSC 0.010 0.012 0.004 0.009 0_ 7_ 0.395 0.415 0.010 0.029
-A-
20 11
-B-
1 10
10X
P 0.010 (0.25)
M
B
M
20X
D
M
0.010 (0.25)
TA
S
B
J
S
F R C -T-
18X SEATING PLANE X 45 _
G
K
M
MOTOROLA ANALOG IC DEVICE DATA
15
TCA3388
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different applications. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
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TCA3388/D MOTOROLA ANALOG IC DEVICE DATA
*TCA3388/D*

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