Tone Ringer. XR-T8205 Datasheet

XR-T8205 Ringer. Datasheet pdf. Equivalent


Exar XR-T8205
EX'!IR
XR-T8205
Tone Ringer
GENERAL DESCRIPTION
The XR-TB205 Tone Ringer is primarily intended as a re-
placement for the mechanical telephone bell. The device
can be powered directly from telephone AC ringing voltage
or from a separate DC supply. An adjustable trigger level
is provided with an external resistor.
The XR-TB205 is designed for nominal 15 volt operation
and is available in an 8 pin D IL package.
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Low Supply Current
Operates Directly From Telephone Line
Provides Single or Dual Tone Frequencies to Simulate
Mechanical Bell
Operates from 15 to 30 Volts
Pin-to-Pin Compatible with MITEL ML8205
APPLICATIONS
Electronic Telephones
Alarm or Other Alerting Devices
Power Line Indicator
Toys
ABSOLUTE MAXIMUM RATINGS
Storage Temperature
Operating Temperature
Supply Voltage
Input Voltage
-65°C to +150°C
DoC to 70°C
30V
-.3 V <; V,N <; VDD +.3 V
ORDERING INFORMATION
Part Number
XR-T8205CP
XR-T8205P
Package
Plastic
Plastic
Operating Temperature
DoC to 70°C
DoC to 70°C
SYSTEM DESCRIPTION
The XR-T8205 Tone Ringer consists of two oscillator cir-
cuits, a dial reject filter and an amplifier to drive high impe-
dance audio transformer or plezo·eleetric transducers.
The power supply control circuit provides the hysteresis re-
quired to ensure positive triggering of the device and to pre-
vent transient triggering due to dial pulsing.
As the power supply voltage to the XR-T8205 is increased
up to the supply initiation voltage (VSll. oscillation begins.
The low frequency oscillator oscillates at a rate of FL con-
trolled by an external resistor and capacitor, connected
between Pins 3 and 4. The output of F L is internally con-
nected to the switching threshold cicuitry of the high fre-
quencyoscillator.
2-97


XR-T8205 Datasheet
Recommendation XR-T8205 Datasheet
Part XR-T8205
Description Tone Ringer
Feature XR-T8205; EX'!IR XR-T8205 Tone Ringer GENERAL DESCRIPTION The XR-TB205 Tone Ringer is primarily intended as.
Manufacture Exar
Datasheet
Download XR-T8205 Datasheet




Exar XR-T8205
XR-T8205
ELECTRICAL CHARACTERISTICS
Test Conditions: VOO = 17 V TA = 25°C, unless specified otherwise.
SYMBOL
PARAMETERS
MIN. TYP. MAX.
VOO
Operating Supply Voltage
15 17
30
10 Operating Current
.7 1.2
IS
Supply Initiation Current
1.4 2.5
4.2
IT Trigger Current
10 20
1000
Vo Output Voltage
17 19
21
t.fo Oscillator Frequency
Tolerance
10
UNIT
V
rnA
rnA
p.A
V
%
CONDITIONS
No Load
No Load, RT = 6.8 kll
No Load, VOO = 21 V
4.5
4.0
3.5
3.0
~ 2.5
S
!!J 2.0
1.5
1.0
5
0 2 4 6 8 10 12 14 16 18 K~l
RT(KQI
Figure 1. SupplV Initiation Current (IS) VS RT
2-98



Exar XR-T8205
XR-T8205
PIN AND FUNCTION DESCRIPTION
Pin Number
Supplies
VDD, GND
1,5
Power supply inputs - the device is designed to operate
from 15 to 30 volts.
Trigger In
2
This pin is provided to adjust power supply initiation
current.
Rate Oscillator
3,4
Rl, Cl low frequency oscillator external components.
Oscillation rate is determined using the relation FL ==
1/( 1.234 R l Cll where R is the value of the resistor con-
nected between Pin 3 and 4, and C is the value of the
capacitor connected between Pin 3 to Ground.
Ringing Oscillator
6, 7
CH, RH High frequency oscillator external components.
When the output of the rate oscillator is high, the high
frequency oscillator oscillates at its normal rate, descri-
bes by the relation FH == 1/(1.515 RHCHI where R is the
value of the resistor connected between Pins 6 and 7, and
C is the value of the capacitor connected between Pin 6 to
Ground. When the output of
rate oscillator is low,
high frequency oscillator oscillation changes to FH =
1.25 FL.
Output
8
The output amplifier of the XR-T8205 is capable of driving
a wide range of load impedances, when driven from a low
source impedance power supply.
VDD
RATE OSC
RING OSC
Figure 2. Ring and Rate Oscillator Relationship
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