Page 1
1
2 3 4 5 6 7 8
VCC
RSL
LOWOSC_1
LOWOSC_2
OUTPUT
HIGHOSC_2
HIGHOSC_1
GND
6 7 8 4 3
LOW FREQUENCY
HIGH FREQUENCY
OUTPUT
GL6851
GL6851
TWO TONE RINGER
Description
The GL6851 tone ringer is a monolithic device,
which incorporates two oscillators, an output
amplifier and a power supply control circuit. The
oscillator frequencies can be adjusted over a wide
range by selection of external components. One
oscillator, normally operated at a low frequency,
causes the second oscillator to alternate between
its nominal frequency, and a related higher
frequency. The resulting output is a distinct
warbling tone. The output amplifier will drive
either a transformer coupled loudspeaker or a
piezo-ceramic transducer. The device can be
powered from a telephone line or a fixed d.c.
supply. The GL6851 has provision for
adjustment of the supply initiation current.
Pin Configuration
1
Features
• Low current consumption.
• Designed for telephone bell replacement.
• Small size MINIDIP package.
• Adjustable 2- frequency tone.
• Built-in hysteresis prevents false triggering and rotary dial CHIRPS.
• Alarms or other alerting devices.
• Adjustable for reduced supply initiation current
• Include ESD protection.
Block Diagram
2
GL6851
1
POWER SUPPLY
CONTROL CIRCUIT
(WITH HYSTERESIS)
OSCILLATOR
5
OSCILLATOR
AMPLIFIER
Page 2
2
Absolute Maximum Ratings (Ta = 25¡É)
CHARACTERISTICS SYMBOL VALUE UNIT
Supply Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Electrical Characteristics (Ta = 25¡É)
CHARACTERISTICS SYMBOL
Operating Supply Voltage V
Initiation Supply Voltage
Initiation Supply Current
Sustaining Voltage
Sustaining Current
1
1
2
2
Output Voltage High V
Output Voltage Low V
High Frequency 1
High Frequency 2
Low Frequency
V
V
I
f
f
CC
SI
I
SI
SUS
SUS
OH
OL
H1
H2
f
L
VCC
Po
Topr
Tstg
30
400
-25 to 65
-65 to 150
TEST CONDITION MIN TYP MAX UNIT
- - 29.0 V
17 19 21 V
0.9 2.0 3.7 mA
9.7 11.0 12.0 V
0.4 1.0 2.0 mA
V
=21V, I8=-10mA
CC
Pin6=6V,Pin7=GND
V
=21V, I8= 10mA
CC
Pin6=GND,Pin7=6V
R3=191K,C3=6800pF
R3=191K,C3=6800pF
R2=165K,C2=0.47µF
17 19 21 V
- - 2 V
461
576
9.0
512
640
10
V
mW
¡É
¡É
563
704
11.0
GL6851
Hz
Hz
Hz
* NOTE
1. Initial supply voltage (VSI) is the supply voltage required to start the tone ringer oscillation.
2. Sustaining voltage (V
) in the supply voltage required to maintain oscillation.
SUS
Page 3
3
PIN DESCRIPTION
7K - 13K
1300 : 8 ohm
TIP
C1
R1
RING
C4
D1
R2
C2
R3 C315K
D1 = 29 V
R3 = 191 kohm
1
3 4 5
6
8
RSL
PIN NUMBER PIN FUNCTION DESCRIPTION
PIN 1 VCC
PIN2 RSL
PIN3 LOWOSC_1
PIN 4 LOWOSC_2
Operating supply D.C. voltage rectified
from ringing signal.
Initiation current programming Pin.
(Must be connected)
Low Frequency Time Constant Adjustment pins
fL is controlled externally by R2 and C2
fL = 1/1.289R2C2
PIN 5 GND Ground
PIN 6 HIGHOSC_1
PIN 7 HIGHOSC_2
High Frequency Time Constant Adjustment Pins
fH1 and fH2 are controlled externally by R3 and C3.
fH1=1/1.504R3C3, f
PIN 8 OUTPUT Tone output
APPLICATON CIRCUIT
= 1/1.203R3C3
H2
GL6851
C1 = 0.9uF
C2 = 0.47uF
C3 = 6.8nF
C4 = 22µf / 35V
C5 = 0.22 uF
R1 = 560 ohm
R2 = 165 kohm
2
GL 6851
C5
10K
7
VOLUME
Loading...