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U3760MB
Low-Voltage Standard Telephone Circuit
Description
TEMIC's low-voltage telephone circuit, U3760MB, performs all the speech and line interface functions required in an electronic telephone set tone ringer, pulse and DTMF dialing with redial. Electrostatic sensitive device. Observe precautions for handling.
Features
Speech Circuit D Adjustable dc characteristic D Symmetrical input of microphone amplifier D Receiving amplifier for dynamic or piezo-electric
earpieces
D Automatic line-loss compensation
Dialer
D D D D
Selectable flashing duration by key pad Pause function Last number redial up to 32 digits Standard low-cost 3.58-MHz crystal or ceramic resonator
Tone Ringer
D DTMF / pulse switchable D Pulse dialing 66/33 or 60/40 for 10 ppS and 20 ppS or
DTMF dialing selectable by pins
D Two-tone ringer D Adjustable volume D RC oscillator D Adjustable threshold
D Key tone
Benefits
D Low number of external components D High quality through one-IC solution D One IC for all standards
Ordering Information
Extended Type Number U3760MB-MSD U3760MB-MFN U3760MB-MFNG3 Package SDIP40 SSO44 SSO44 Remarks
Taped and reeled
Rev. A3, 19-Feb-98
1 (19)
5V1 1M 220 k Tip HKS 5M 470 1m 220 k HKS BC546 EP 18 k 3k MPSA42 22 k 220 n 2n2 HKS Microphone - amplifier + Control function 2.4 k Sidetone amplifier 3n3 ST Pulse control logic Supply current regulator Control function Receiver attenuation RECIN 2.2 m Receiving amplifier RECO1 100 RECO2 AGC 12 k RDC 39 VBG 1 W VI VRING Supply Power-on-reset VRIAC OUT Tone signal generator 10 k 28 V 10 m 390 100 m 1.8 k 47 n EP Mute control Transmit amplifier VL 680 MODE BM KT DP VDD2 VDD1 MFO MIC1 MIC2 MICO TIN CL 13 V 1W 330 2N5401 33 k 220 m 75V 470 k 47 n 5k
3.58 MHz
AA AA
Ring 10 k
U3760MB
100 n
100 n
XT
XT
Clock generator
C1
Block Diagram / Applications
C2
C3
K e y b o a r d RAM l o g i c
Read - write counter
C o n t r o l
1
2
3 F1
R1
4
5
6 F2
R2
Figure 1.
AGC current generator D/A converter Data latch & decoder ROW & column programmable counter Clock signal oscillator Divider Divider Bandgap reference Comparator with hysteresis
7
8
9 F3
R3
*/T 0
# R/P
R4
i n t e r f a c e
Location latch
PRIVACY
47 n
MUTE
1n
RCK
150 k THA
GND1
GND2
8176
AA
2 (19)
220 k
Rev. A3, 19-Feb-98
U3760MB
SDIP40 C1 C2 C3 KT XT XT MFO GND 2 GND 1 1 2 3 4 5 6 7 8 9 40 39 38 37 36 35 34 33 C1 1 C2 2 C3 3 n.c. 4 n.c. 5 n.c. 6 MODE KT 7 BM XT 8 HKS XT 9 32 VDD 2 MFO 10 MIC 1 10 MIC 2 11 31 VDD 1 GND 2 11 30 OUT GND 1 12 29 28 RCK MIC 1 13 VL 13 RDC 14 n.c. 15 TIN 16 VI 17 MUTE 18 VBG 19 RECIN 20
10181
SSO44 44 43 42 41 40 39 38 37 36 35 34 R4 R3 R2 R1 n.c. DP MODE BM HKS n.c. VDD 2 VDD 1 OUT
R4 R3 R2 R1 DP
U3760MB
33 32
U3760MB
MICO 12 VRING
MIC 2 14 MICO 15 VL 16 RDC 17 TIN 18 VI 19 MUTE 20 VBG 21 RECIN 22
10180
31 RCK 30 VRING 29 VRIAC 28 AGC
27 VRIAC 26 AGC 25 THA 24 ST 23 PRIVACY 22 RECO 1 21 RECO 2
27 THA 26 ST 25 24 23 PRIVACY RECO 1 RECO 2
Rev. A3, 19-Feb-98
3 (19)
U3760MB
Pin Description
PD means protection device SDIP40 1 SSO44 1 Symbol C1 Function Keyboard input
C1
PD
Configuration
2
2
C2
C2
PD
3
3
C3
C3
PD
15 4
4, 5, 6, 35 7
n.c. KT
Not connected Key tone signal output generated for all keys in pulse dialing mode (except Flash + Redial) with a frequency of about 1240 Hz and duration about 50 ms A built-in inverter provides oscillation with an inexpensive 3.579545-MHz crystal or ceramic resonator
XT
PD
KT
5
8
XT
6
9
XT
XT
40P PD 40P
7
10
MFO
Output of DTMF DTMF output frequency Specified Actual (HZ) (Hz) R1 697 699 R2 770 766 R3 852 848 R4 941 948 C1 1209 1216 C2 1336 1332 C3 1477 1472
Error (%) +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34
MFO
9 8
12 11
GND 1 GND 2
Ground 1 connected with ground 2
4 (19)
Rev. A3, 19-Feb-98
U3760MB
SDIP40 10 SSO44 13 Symbol MIC 1
1V 50K
MIC1
11
14
MIC 2
12
15
MICO
Transmit pre-amp output which is normally capacitively coupled to Pin TIN
MICO
PD
13
16
VL
Positive supply voltage input to the device. The current through this pin is modulated by the transmit signal.
VL
PD 16V
RDC
14
17
RDC
AGC
PD
RDC
1V
16
18
TIN
Input to the line output driver amplifier. Transmit AGC is applied to this stage. This internal voltage bias line must be connected to VL via an external resistor, RB, which dominates the ac input impedance of the circuit and should be 680 for 600-W input impedance or 1.2 k for a 900- input impedance.
5.6K
TIN
PD
16V
17
19
VI
VI
16V PD
Rev. A3, 19-Feb-98
E EE EE
E
An external resistor (1 W) is required from this pin to GND to control the dc input impedance of the circuit. It has a nominal value of 39 W for low-voltage operation. Values up to 100 W may be used to increase the available transmit output voltage swing at the expense of low-voltage operation.
EE E E E
Non-inverting input of microphone amplifier
MIC2
50K 1V VI
E
VI
Function Inverting input of microphone amplifier
Configuration
PD
PD
VI
1V
16K
PD
VL
PD
5 (19)
U3760MB
SDIP40 18 SSO44 20 Symbol MUTE Function Pin for testing
MUTE
PD 6.7V
Configuration
30K VBG
19
21
VBG
Pin for test mode
VBG
6.7V PD
20
22
RECIN
Receive amplifier input. The receiving amplification is regulated by an AGC. Output of the receive amplifier. Dynamic transducers with a minimum impedance of 100 W can be directly driven by these outputs.
RECIN
60K
21
23
RECO2
RECO2 RECO1
6.7V PD
23
25
PRIVACY Input for handset mute
PRIVACY
PD
6V
24
26
ST
The output of the sidetone cancellation signal, which requires a balanced impedance of 8 to 10 times the subscriber's line impedance to be connected to Pin VL. Ringer threshold adjustment
ST
PD
16V
25
27
THA
VRIAC
THA
PD
6V 6V
20K
26
28
AGC
The range of transmit and receive gain variations between short and long loops may be adjusted by connecting a resistor RAGC from this pin to (GND). This pin can be left open to set AGC out of action. Ringing supply
AGC
PD
RDC
27
29
VRIAC
50V PD
10K
6 (19)
Rev. A3, 19-Feb-98
EEE
VRIAC
70K
E EE
12K
E E EE E E EE
22
24
RECO1
6V
140K
E E E E
VL VL 60K VI 40K 0.6V
MUTE
1V
E
1V
VL
PD
U3760MB
SDIP40 28 SSO44 30 Symbol VRING Function DC supply voltage for the tone ringer is limited to 30 V with integrated Z-diode. Configuration
VRING
30V PD 6.5K 200
OUT
PD
50V
29
31
RCK
RC clock oscillator for ringer
RCK
PD
6V 6V
30
32
OUT
Buzzer output
VRING
PD 30V 200 6.5K
OUT
50V PD
31
33
VDD 1
Supply output of dialer section
6V 6V PD
VDD1
32
34
VDD 2
Supply input of dialer section
VDD2
PD
33
36
HKS
Hook switch input. HKS = 1: On-hook state. Chip in sleep mode, no operation. HKS = 0: Off-hook state. Chip enable for normal operation. If BM = floating pulse, dialing with 3:2 B/M ratio If BM is connected to ground, pulse dialing with a B/M ratio of 2:1 Pulling mode pin to VDD places the dialer in tone mode. Pulling mode pin to GND places the dialer in pulse mode ( 20 ppS ). If the mode pin is left floating, the dialer is in pulse mode ( 10 ppS) N-channel open drain pulse dialing output. Flash key will cause DP to be active in either DTMF mode or pulse mode.
HKS
PD
34
37
BM
B/M
PD
35
38
MODE
MODE
36
39
DP
DP
Rev. A3, 19-Feb-98
E EE EE
3.4V 0.8V
E E
DP
VL
7 (19)
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1.
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:/T
C1 1 4 7 C2 2 5 8 0 C3 3 6 9 # F1 F2 F3 R/P
The R/P key can execute the redial function only as the first key-in after off-hook; otherwise, it executes the pause function.
Redialing
2.
Normal Dialing
D :/T: : and pulse-to-tone key D R/P: Redial and pause function key D F1, F2, F3: Flash keys
Keyboard Operation
U3760MB
8 (19) SDIP40 37 OFF HOOK OFF HOOK 40 39 38 Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits. D1, D2, ..., Dn will be dialed out. SSO44 41 44 43 42 , D1 , Symbol R1 R4 R3 R2 D1 , D2 Function Keyboard input , , ..., D2 Dn , ..., BUSY, Come Dn ON HOOK
R4
R3
R1
R2
Configuration
,
R1 R2 R3 R4
OFF HOOK
PD
PD
PD
PD
Rev. A3, 19-Feb-98 , R/P
U3760MB
HKS
10626
KEY IN
3
2
R/P
tKID DP tPDP MUTE
tPDP
tKID
tIDP
tB tM
tIDP
tPDP
KT
LOW MFO
OSC ON HOOK
Oscillation OFF HOOK Normal dialing
Oscillation Auto dialing
Figure 2. Pulse mode
10627
HKS
KEY IN tKID tKRD tKRD tKID tITP MFO tTD MUTE tITP tITP
LOW KT HIGH DP
OSC
Oscillation
Oscillation
Figure 3. DTMF mode normal dialing
Rev. A3, 19-Feb-98
9 (19)
U3760MB
10628
HKS KEY IN tKID R/P
MFO tTD MUTE tITP tITP
KT DP
LOW HIGH
OSC
Oscillation
Figure 4. DTMF auto dialing
Access Pause
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OFF HOOK , D1 , D2 , R/P , D3 , ..., Dn' 1. 2. The pause function can be stored in memory. The pause function is executed in normal dialing and redialing.
10629
HKS R/P
KEY IN
4 tKID
2
2
M tIDP tB tM tIDP tPDP tIDP
DP tPDP
MUTE tP
KT MFO OSC LOW Oscillation
Figure 5. Pause function
10 (19)
Rev. A3, 19-Feb-98
U3760MB
Pulse-to-Tone (:/T)
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OFF HOOK , D1 , D2 , ..., Dn ,
:/T
,
D1'
,
D2'
, ...,
Dn'
1.
If the mode switch is set to pulse mode, then the output signal will be:
D1, D2, ..., Dn, Pause (3.6 s), D1', D2' ,..., Dn' (Pulse) (Tone)
2.
If the mode switch is set to tone mode, then the output signal will be: D1, D2, ..., Dn, (Tone) * (Tone) , D1', D2', ..., Dn' (Tone)
3.
The dialer remains in tone mode when the digits have been dialed out and can be reset to pulse mode only by going on-hook.
HKS
10630
KEY IN
4
2
*/T
8
tKID DP tIDP tIDP
tPDP MUTE
tB tM
tP
KT
MFO
OSC
Oscillation
Figure 6. Pulse-to-tone operation
Rev. A3, 19-Feb-98
11 (19)
U3760MB
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AAA A A AA A A AAAAAAAAAAA AAA A A AAAAAAAAAAA AAA AA A AAAAAAAAAAA AAAAAAAAAAA AAAAAAAAA A A
OFF HOOK , Fn 1. 2. OFF HOOK , Fn LNB = D1, D2, D3, ..., Dn OFF HOOK , D1 LNB = D3, ..., Dn
HKS KEY IN F tKID DP MFO MUTE KT OSC
Flash (F1 or F2 or F3)
The flash key cannot be stored as a digit in memory. The flash key has first priority among the keyboard functions. The system will return to the initial state after the flash pause time has elapsed.
,
D1
,
D2
,
D3
, ...,
Dn
,
D2
,
Fn
,
D3
, ...,
Dn
10631
4
tFB
tFP
tTD
tITP
LOW
Oscillation
Figure 7. Flash operation
tKID tKRD tPDP tIDP tTD
= key active in debounce = key release debounce = pre-digit pause = inter-digit pause = DTMF output duration
tITP tFB tFP tP
= intertone pause = flash break time = flash pause time = pause time
12 (19)
Rev. A3, 19-Feb-98
U3760MB
Absolute Maximum Ratings
Parameters Line current DC line voltage Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb = 60C SSO44 SDIP40 Junction ambient SSO44 SDIP40 RthJA 70 50 k/W Symbol IL VL Tj Tamb Tstg Ptot Value 140 14 125 - 25 to + 75 - 55 to + 150 0.9 1.3 Unit mA V C C C W
Electrical Characteristics Speech Circuit
Reference point Pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39 / 1 W, Tamb = 25C, unless otherwise specified Parameters Line voltage Test Conditions / Pin IL = 5 mA IL = 20 mA IL = 30 mA IL = 73 mA Ri IL = 20 mA, S5 = open RAGC = 12 kW, IL = 73 mA IL > 20 mA, GS = 48dB IL Symbol VL Min. 1.2 Typ. 4.0 4.5 6.4 Ri Gs no GSTA 10 1.3 -8 1 15 45 46.8 - 4.8 80 47.8 -6 120 48.8 -7 - 72 20 Max. 1.5 Unit V V V V k dB dB dBmp dB dBm dBm dB
Transmit and sidetone Input resistance Gain Line-loss compensation Noise at line weighted psophometrically Sidetone reduction DTMF amplifier Volume range d < 5% DTMF output level low frequency group Preemphasis between highand low-level frequency group Receiving amplifier Gain Line-loss compensation Receiving noise at earphone weighted psophometrially Gain change when muted Output voltage push-pull
DGs
y 20 mA w
Single tone, IL 20 mA IL = 20 mA, S5 = closed PPRE = PHLG - PLLG, S5 = closed
VL VL PPRE
-4 3
IL 20 mA IL = 73 mA IL = 73 mA
w
DGR
ni
GR
3 - 4.7
-6 - 77.5
5 -7 - 71
dB dB dBm
IL 20 mA IL 20 mA, Zear = 68 nF, 100 W in series Supply voltage (for internal use only) Output voltage IL 20 mA dialing mode
y y
GRM VRECO
24 0.8
29 0.9
34
dB VRMS
y
VDD 1
2.3
6.3
V
Rev. A3, 19-Feb-98
13 (19)
U3760MB
DC Characteristics Dialer
VDD2 = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9b Parameters Memory retention current Preemphases DTMF distortion DP output sink current Keyboard input drive current Keyboard input sink current Keyboard resistance Key tone output current Key tone frequency Test Conditions / Pins HKS = 1, VDD2 = 1.0 V Column/Row RL = 5 kW VPO = 0.5 V VI = 0 V VI = 2.7 V Symbol IMR d IPL IKD IKS 0.5 30 200 400 Min. 1 Typ. 2 - 30 Max. 0.2 3 - 23 Unit
mA
dB dB mA
mA mA
t = 50 ms
1240
"1
5
kW mA Hz
AC Characteristics Dialer
Parameters Keypad active in debounce Key release debounce Pre-digit pause Inter-digit pause ( auto dialing ) Make/break ratio DTMF output duration Inter-tone pause Flash break time F1 F2 F3 Flash pause time Test Conditions / Pins Symbol tKID tKRD tPDP tPDP tIDP tIDP M/B tTD tITP tFB Min. Typ. 20 20 40 33.3 800 500 40:60 33:67 87 87 94 250 600 3.6 tP 3.6 Max. Unit ms ms ms ms ms ms % % ms ms ms ms ms s s s s
B/M pin = floating 10 ppS B/M pin = low 10 ppS 20 ppS B/M pin = floating B/M pin = low Auto dialing Auto dialing R1 grounded R2 grounded R3 grounded F1 F2 F3
tFP
Pause time
14 (19)
Rev. A3, 19-Feb-98
U3760MB
Electrical Characteristics Tone Ringer
fRCK = 4 kHz, VRING = 20 V, Tamb = 25_C, reference point GND, unless otherwise specified Parameters Supply current, outputs open Switch-on threshold Switch-off threshold Ringing frequency Test Conditions / Pins VRIAC = 20 V VRIAC VRIAC R = 150 k, C = 1 nF VRIAC > VRON Symbol IRING VRon VRoff f1H f1L f2 toff 937 752 11.5 Min. 2.1 Typ. Max. 3.8 Unit mA V V 1083 868 14.0 Hz Hz Hz ms
23.5 5.6 1010 808 12.5 65
Audio sequence frequency Turn-off delay
See figure 8
Volt VRING 0
12459
t
VRIAC 0 t
OUT Melody t 0 toff
Figure 8. Turn off delay time
Rev. A3, 19-Feb-98
15 (19)
Basic Test Circuit
U3760MB
I/O
OUT
I/O
IN
A A
To tester
To tester
16 (19) Rev. A3, 19-Feb-98
12460
a To tester VMIC To tester VGEN 100 mV 100n 220 m a S9
I/O IN IN
b S7 VGEN 100 m 300 mV / 1 kHz 600 IL
VDD 25k
8.2k S5 220n
25k
1m S8
10k S6 MIC2 MFO
b VDD1 MIC1
BM KT DP VDD2 MODE HKS XT S11 XT
MICO
TIN VL
1.5k
VL 13V
Clock
4.7k 1 ST 47n RECIN VI C1 C2 C3 R1 R2 R3 R4 MUTE RECO1 2.2n 620
3.58 MHz
IN IN IN IN IN IN IN I/O
U3760MB
RECO2 AGC RDC VBG VRING VRIAC OUT THA
VRECO
2.2 m 330
100 m
12k
S1 47n 1n 150k
39
PRIVACY RCK GND2 GND1
VRING VRIAC 68n
U3760MB
Formulas for Parameters of Electrical Characteristics of Speech Circuit
Formulas refer to the basic test circuit. If not otherwise specified, switches in basic test circuit are inactive.
Transmit gain GS
+ 20
log
VL VMIC
VMIC = 3 mV/1 kHz, S5 = open
Receiving gain GR
+ 20
log VRECO VL
RX-mode: VGEN = 300 mV/1 kHz, S7b
Line-loss compensation transmit DGS GS(at IL 73 mA)-GS(at IL
+
+
+ 20 mA)
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Sidetone reduction GSTA
+ 20
log
VL (in TX-mode) VRECO
) GR
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Line-loss compensation receive DGR GR(at IL 73 mA)-GR(at IL
+
+
+ 20 mA)
RX-mode: VGEN = 300 mV/1 kHz, S7b
Gain change when muted GRM
+ 20
log VRECO (Mute VL
+ inactive)-20
log VRECO (Mute VL
+ active)
VGEN = 100 mV/1 kHz, S5 = open, S8 = open
Input impedance of microphone amplifier 50 k Ri
+
VL (s6
VL(S6
+ closed) -1 + open)
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Rev. A3, 19-Feb-98
17 (19)
U3760MB
Package Information
Package SDIP40
Dimensions in mm
37.4 36.9 4.9 4.3 0.7 3.3 0.53 0.48 33.782 1.778 0.38 0.20 17.2 16.0 13.9 13.7 15.34 15.14
technical drawings according to DIN specifications
1
13027
Package SSO44
Dimensions in mm
18.05 17.80
9.15 8.65 7.50 7.30
2.35 0.3 0.8 16.8 44 23 0.25 0.10
0.25 10.50 10.20
technical drawings according to DIN specifications 13040
1
22
18 (19)
Rev. A3, 19-Feb-98
U3760MB
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC Semiconductor GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC Semiconductor GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
Rev. A3, 19-Feb-98
19 (19)

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