GL6840A Datasheet, PDF (1/8 Pages) Hynix Semiconductor – Electronic Two Tone Ringer

GL6840
GL6840A
Electronic Two Tone Ringer
Description
Pin Configuration
GL6840A are monolithic integrated circuits designed
to replace the mechanical bell in telephone sets,
in connection with an electro acoustical converter.
The device can drive either directly a piezo ceramic
converter(buzzer) or a small loudspeaker. In this
case a transformer is needed. The two tone frequen-
cies generated are switched by an internal oscillator
in a fast sequence and made audible across output
amplifiers in the transducer, both tone frequencies
and switching frequency can be externally adjusted.
The supply voltage is obtained from the AC rings
signal and the circuit is designed so that noise on the
line or variations on the ringing signal cannot affect
the correct operation of the devices.
The output bridge configuration allows to use a high
impedance transducer with acoustical results much
better than in a single ended configuration. The two
outputs can also be connected independently to
different converters or actuators(acoustical, opto and
logic)
Line
1
8 Line
GND
2
7
Rectifier
capacitor
Sweep rate
control capacitor
3
6 Buzzer
Output freq.
Control resistor
4
5
(Top View)
Buzzer
Absolute Maximum Ratings
Calling Voltage(f=50§ Ô)
120Vrms
continuous
Calling Voltage(f=50§ Ô)
200Vrms
5s ON/10s OFF
Supply Current
Operating Temperature
Storage Temperature
22§ Ì
-20 to 75¡ É
-65 to 150¡ É
Features
• Low current consumption, in order to allow the
parallel operation of 4 devices
• Integrated rectifier bridge with zener diodes to
protect against overvoltages
Test Circuit
For GL6840A
f₁ =
3.26 x
R₁(§
10⁴
Ú)
x
(2
-
e
14
- R₁(§
95
Ú)
)
f₂ = 0.717 x f₁
1§ Þ 2.2§ Ú
f_sweep =
1000
C₁(§ Ý)
• Little external circuitry
Buzzer
• Tone and switching frequencies adjustable byV_{AB Line}
external components
£«
• Integrated voltage and current hysteresis
• Bridge output configuration
10§ Þ
8
5
7 ^GL6840A 6
1234
VS
C1
R1
100§ Ý ^{14§ Ú}
1