型号: LT1684IS#TRPBF
厂商: Linear Technology Linear Technology
标准:
分类: 集成电路接口 - 电信
描述: IC ring tone generator 14-soic
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LT1684IS#TRPBF的详细信息

Datasheets:
LT1684:
Product Photos:
14-SOIC:
Standard Package : 2,500
Category: Integrated Circuits (ICs)
Family: Interface - Telecom
Series: -
Packaging : Tape & Reel (TR)
Function: Tone Generator
Interface: -
Number of Circuits: 1
Voltage - Supply: -
Current - Supply: -
Power (Watts): -
Operating Temperature: -40°C ~ 125°C
Mounting Type: Surface Mount
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Supplier Device Package: 14-SOIC
Includes: -
For Use With: DC192A-ND - EVAL BOARD RING TONE GEN LT1684
LT1684  
Micropower  
Ring Tone Generator  
U
FEATURES  
DESCRIPTIO  
Allows Dynamic Control of Output Frequency,  
The LT®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.  
Cadence, Amplitude and DC Offset  
Active Tracking Supply Configuration Allows Linear  
Generation of Ring Tone Signal  
No High Voltage Post-Filtering Required  
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 ±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.  
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—No Additional Supplies Necessary  
Supply Current: <1mA  
2% Signal Amplitude Reference  
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 “active tracking” supply mode of operation  
allows linear generation of the high voltage ring tone  
signal, reducing the need for large high voltage filtering  
elements.  
Available in 14-Pin SO and DIP Packages  
U
APPLICATIO S  
Wireless Local Loop Telephones  
Key System/PBX Equipment  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Fiber to the Curb Telecom Equipment  
U
TYPICAL APPLICATIO  
Electrically Isolated Ring Tone Generator  
DC  
100V  
PWM  
ISOLATION  
CONTROLLER  
6.8nF  
100k  
10k  
100pF  
100pF  
+
P1  
µC  
IN A  
IN B  
GATE  
V
IRF610  
100  
FB1  
10k  
+
+
P2  
LT1684  
1N4001  
LIM  
OUT  
+
100pF  
20pF  
AT  
REF  
RING TONE  
OUTPUT  
±100mA  
CAPABILITY  
(
)
BG  
COMP1  
OUT  
0.1µF  
3k  
1N5817  
6.8nF  
COMP2  
2k  
5k  
AMPIN  
LIM  
V
4700pF  
300k  
100Ω  
GATE  
IRF9610  
1µF  
100k  
–100V  
FB1: FERRONICS FMB1601  
(716) 388-1020  
1684 TA01  
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