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參數(shù)資料
| 型號(hào)： | LT1684IS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC RING TONE GENERATOR 14-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 功能： | 音頻發(fā)生器 |
| 電路數(shù)： | 1 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
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10
LT1684
The component selections for the active tracking supply
lowpass MFB filter configuration follow the relations:
C2 = mC1
m
≤ 1 / [4Q2(1+|HO|)]
R2 = 1± [1–4mQ2(1+|HO|)]1/2
2
ωnC1mQ
R1 = R2 / |HO|
R3 =1
ωn2C12R2m
Example:
Conditions: Output ring tone peak voltage = 100V
Ring frequency = 20Hz
Input duty cycle range = 10% to 90%
Filter Q = 0.707
Set:
fn = ωn / 2π = 100Hz
Choose:
C1 = 1.0F (a convenient value)
Then:
m
≤ [4(0.7)2(1+100)]–1
≈ .005
C2 = mC1
C2 = 4700pF
(sets m = 0.0047)
R2 = 1± [1– 4(0.0047)(0.707)2(101)]1/2
(4
π100)(1e–6)(.0047)(0.707)
R2 = 300k
R1 = 300k/100
R1 = 3.0k
R3 = [(2π100)2(1e–6)2(300k)(0.0047)]–1
R3 = 2k
This filter configuration yields a DC Gain of 100, a corner
frequency of just under 100Hz with gain reduction of only
0.1% at 20Hz, and a 10kHz carrier rejection of greater than
40dB at the output.
Active Tracking Supply Components
Given the previous discussion, implementation of an
active tracking supply system may seem almost trivial.
Active Tracking Supply Lowpass Multiple
Feedback Filter Transfer Characteristic (AV vs fn)
However, bootstrapping an amplifier system about its
own output creates a complex myriad of inherent stability
and response issues. Attempting such a configuration
with generic “jelly-bean” components is not recommended
for the faint of heart or type-A personalities. The LT1684,
however, makes for a simplistic approach to active track-
ing component selection.
The high voltage MOSFET transistors used in the circuit
must have an operating VDS specified at greater than the
corresponding high voltage supply rail plus the opposite
maximum excursion of the output signal. For example, if
a system is designed with a 240V supply (+ 120V,
–120V) and outputs a ring signal that has a 100V peak
amplitude, the MOSFET VDS ratings must be greater than
240/2 + 100 = 220V.
Active Filter Tuned Oscillator—
No PWM Input Required
A simple yet effective method of producing a high quality
sine wave is to place a high-Q bandpass filter and a hard
limited gain element in a positive feedback loop. This
circuit will oscillate at the bandpass frequency, producing
a sine wave at the filter output. The product of the funda-
mental component of the limiter and the filter gain at the
bandpass frequency determines the output amplitude.
This type of circuit is commonly referred to as an active
filter tuned oscillator.
HERTZ (Hz)
1
10
100
1K
10K
100K
FILTER
GAIN
(dB)
1684 F02
–50
0
50
APPLICATIO S I FOR ATIO
WU
UU
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| LT1684IS#TR | IC GENERATOR RING TONE 14SOIC |
| LT1684IS | IC RING TONE GENERATOR 14-SOIC |
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