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LT1684 Datasheet

  • LT1684

  • Micropower Ring Tone Generator

  • 16頁(yè)

  • LINER

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LT1684
Micropower
Ring Tone Generator
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Allows Dynamic Control of Output Frequency,
Cadence, Amplitude and DC Offset
Active Tracking Supply Configuration Allows Linear
Generation of Ring Tone Signal
No High Voltage Post-Filtering Required
Capacitive Isolation Eliminates Optocouplers
Low Distortion Output Meets International
PTT Requirements
Differential Input Signal for Noise Immunity
User Adjustable Active Output Current Limit
Powered Directly From High Voltage Ringer
Supply鈥擭o Additional Supplies Necessary
Supply Current: < 1mA
2% Signal Amplitude Reference
Available in 14-Pin SO and DIP Packages
The LT
廬
1684 is a telecommunication ring tone generator.
The IC takes a user-generated pulse width modulated
(PWM) input and converts it to a high voltage sine wave
suitable for telephone ringing applications.
The LT1684 receives capacitor-isolated differential PWM
input signals encoded with desired ring output cadence,
frequency, and amplitude information. The LT1684 nor-
malizes the pulse amplitude to
鹵1.25V
for an accurate
signal voltage reference. The cadence, frequency and
amplitude information is extracted using a multiple-
pole active filter/amplifier, producing the output ring tone
signal.
The LT1684 uses its own ring tone output as a reference
for generating local supply rails using complementary
high voltage external MOSFETs as dynamic level-shifting
devices. This 鈥渁ctive tracking鈥?supply mode of operation
allows linear generation of the high voltage ring tone
signal, reducing the need for large high voltage filtering
elements.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Wireless Local Loop Telephones
Key System/PBX Equipment
Fiber to the Curb Telecom Equipment
TYPICAL APPLICATIO
PWM
CONTROLLER
P1
碌C
P2
DC
ISOLATION
100pF
Electrically Isolated Ring Tone Generator
100V
6.8nF
IN A
10k
IN B
LT1684
LIM
+
OUT
AT
REF
COMP1
GATE
+
FB1
V
+
1N4001
100鈩?/div>
100k
IRF610
10k
100pF
100pF
0.1碌F
BG
OUT
3k
2k
300k
1碌F
5k
AMPIN
4700pF
20pF
COMP2
LIM
鈥?/div>
V
鈥?/div>
GATE
鈥?/div>
6.8nF
1N5817
100鈩?/div>
IRF9610
100k
鈥?00V
FB1: FERRONICS FMB1601
(716) 388-1020
U
+
RING TONE
OUTPUT
U
U
鈥?/div>
(
鹵100mA
CAPABILITY
)
1684 TA01
1

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