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PDF U3750BM Data sheet ( Hoja de datos )
| Número de pieza | U3750BM | |
| Descripción | One Chip Telephone Circuit | |
| Fabricantes | TEMIC Semiconductors | |
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TELEFUNKEN Semiconductors
U3750BM
One Chip Telephone Circuit
Description
TELEFUNKEN microelectronic’s one chip telephone
circuit, U 3750 BM, is BICMOS integrated circuit that
performs all the speech and line interface functions
required in an electronic telephone set, the tone ringer, the
pulse and DTMF dialling with redial, a keyboard inter-
face with the possibility to interface with an external
microcontroller using the internal serial bus, and a power
supply for peripherals.
Features
D Adjustable dc slope characteristic
D Adjustable automatic line length receiving and send-
ing gain control (not used in DTMF) with the
possibility of fixed gain (PABX)
D Adjustable dynamic impedance
D Stabilized power supply for peripherals
D Confidence level during pulse and DTMF dialling
D Receiving amplifier for dynamic or piezo-electric ear
pieces
D High-impedance microphone inputs (80 kW in
symmetrical and 40 kW in asymmetrical) suitable for
dynamic, magnetic, piezo-electric or electret micro-
phone
D Dynamic limiting in sending (anticlipping) prevents
distortion of line signal and sidetone
D Ringing balanced output in HVMOS for higher power
capability
D Four ringing tones adjustable without external
components
D Internal speed up circuit permits a faster charge of
VCC and VRAM capacitors
D Logic bounce elimination
D Pulse dialling 66/33 or 60/40 or DTMF dialling select-
able by programming pin
D Adjustable flashing duration
D Pause function
D Confidence tone (440 Hz)
D Last number redial up to 23 digits
D Standard low-cost ceramic 455 kHz
D Binary data input in serial mode
D Test-mode capability
Benefits
D Low number of external components
D High quality through one chip solution
Rev. A1: 16.07.1996
1 (20)
1 page  
TELEFUNKEN Semiconductors
Thermal Resistance
Junction ambient
Parameters
Symbol
RthJA
U3750BM
Value
70
Unit
K/W
Electrical Characteristics
f = 1 kHz, fclock = 455 kHz, RE = 20 kW, Tamb = 25°C,
unless otherwise specified, Q (Resonance factor) = 3100,
L1 = 6.1 mH, C1 = 21 pF, CO = 268.5 pF, R1 = 5.5 W. All
resistances are specified at 1%, all capacitance at 2%.
Parameters
Test Conditions / Pins Symbol Min. Typ. Max. Unit
Line voltage normal
Line voltage operation
IL = 8 mA
IL = 15 mA
IL = 28 mA
IL = 60 mA
figure 3
VL 2.9
3.6
4.1 4.5 4.9
6.4 7.3
12.3 13.7
V
Stabilized voltage
wIL = 8 mA, ICC = 0.6 mA
VCC 2.0
2.5
IL 28 mA, ICC = 2.1 mA
3.3 3.5 3.7
figure 3
V
Transmission
Sending gain
AGC
VMI = 2 mVRMS (note 1)
IL = 28 mA (GS max)
GS 47 48 49 dB
IL = 60 mA (GS min)
39.5 41 42.5
IL = 28 to 60 mA
D GS –6 –7 –8
figure 3
Psophometric sending noise VMI = 0, IL = 28 mA
figure 3
–73 –68 dBmp
Attenuation gain during
dialing
VMI = 2 mVRMS,
IL = 28 mA
figure 3
AS 63
dB
Microphone input
impedance (Pins 22–23)
figure 3
70 120
kW
Common mode rejection
ratio
IL = 28 mA
figure 3
CMRR
80
dB
From transmission to
dialing mode
IL = 28 to 60 mA
figure 3, Pin 25
Step –100
+100
mV
Dynamic limiter
(anticlipping)
Output voltage swing
(peak-to-peak value)
Overdrive dynamic range
Line distortion (on 600 W )
CACL = 470 nF,
RACL = 6.8 MW
wIL = 20 mA
IL 28 mA,
VMI = 8 mVRMS
figure 3
wIL 28 mA
figure 3
wIL 28 mA
VMI = 4.6 mVRMS
VMI = 8 mVRMS
VMI = 80 mVRMS
figure 3
2.5 Vpp
3.0 3.6 4.2
5 dB
3
5%
5
Rev. A1: 16.07.1996
5 (20)
5 Page 
TELEFUNKEN Semiconductors
U3750BM
Parameters
Serial bus (see figure 12)
Pulse width clock
Pulse width enable signal
Set-up time data to clock
Hold time data from clock
Enable time
Time between two trans-
missions
Pulse dialing (OL)
Dialing pulse frequency
Dialing pulse period
Test Conditions / Pins
In mode 60/40 (Pin 4 tied to
RESET)
In mode 66/33 (Pin 4 not
connected)
Break time
Make time
Interdigit time
Transmission mute:
tmol = (tm + tb) @ n + tm1
n pulses dialling
Flash pulse
Flash pulse duration
Transmission mute
Pause time
Pin 3 to GND Pin 4 to RESET
Pin 3 to GND Pin 4 to NC
Pin 3 to GND Pin 4 to GND
Pin 3 to NC Pin 4 to RESET
Pin 3 to NC Pin 4 to NC
Pin 3 to NC Pin 4 to GND
Pin 3 to RESET Pin 4 to RE-
SET
Pin 3 to RESET Pin 4 to NC
Pin 3 to RESET Pin 4 to GND
In mode 60/40
In mode 66/33
In mode DTMF
In mode 60/40
In mode 66/33
In DTMF mode
Symbol Min.
twl, twh
tel, teh
tset up
te
tRRN
2
2
0
100
0
900
TOL
tb
tm
tIDOL
830
813
[n@ 100
+ 30]
[n@ 98.8
+ 22]
tfl 89.5
98.5
102.5
239.5
263.5
274.0
109.5
120.5
125.0
tmfl 830
813
846
3116
Tp 3075
3012
Typ. Max. Unit
ms
ms
ms
ms
ms
ms
10
10.11
100
98.9
60
66
40
33
833
816.5
(n@ 100)
+ 32
(n@ 98.9)
+ 24.2
Hz
Hz
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
92
101
105
242
266
277
112
123
128
832
815.5
848.5
ms
3118
3077
3110
ms
Rev. A1: 16.07.1996
11 (20)
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet U3750BM.PDF ] | |
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