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参数资料
| 型号： | S1T0567X01-D0B0 |
| 元件分类： | 信令电路 |
| 英文描述： | TELECOM, TONE DECODER CIRCUIT, PDIP8 |
| 封装： | 0.300 INCH, DIP-8 |
| 文件页数： | 4/8页 |
| 文件大小： | 561K |
| 代理商： | S1T0567X01-D0B0 |
S1T0567
TONE DECODER
4
TEST CIRCUIT
NOTE: Adjust for fo =100kHz
APPLICATION INFORMATION
CIRCUIT DESCRIPTION
The S1T0567 monolithic tone decoder consists of a phase detector, low pass filter, and current-controlled oscillator
which comprise the basic phase-locked loop, plus an additional low pass filter and quadrature detector enabling
detection on in-band signals. The device normally has a high open collector output capable of sinking 100 mA.
The input signal is applied to Pin 3 (20k
nominal input resistance). Free running frequency is controlled by an RC
network at Pin 5 , Pin 6 and can typically reach 500kHz. A capacitor on Pin 1 serves as the output filter and
eliminates out-of-band triggering. PLL filtering is accomplished with a capacitor on Pin 2; bandwidth and skew are
also dependent upon the circuitry here. Bandwidth is adjustable from 0% to 14% of the center frequency. Pin 4 is
+VCC (4.75 to 9V nominal, 10V maximum); Pin 7 is ground; and Pin 8 is an open collector output, pull-down when
an inband signal triggers the device.
Definition of S1T0567 Parameters
Center Frequency fO
fO is the free-running frequency of the CL controlled oscillator with no input signal. It is determined by resistor R1
between pins 5 and 6. Capacitor C1 from pin 6 to ground fO can be approximated by
where R1 is in ohms and C1 is in farads.
1
2
3
4
5
6
7
8
S1T0567
+5V
RL
C1
3.3nF
R1
2.4K
C3
C2
C1
0.005
0.01
1uF
0.02uF
Vin
+5V
fi = 100kHz
fo
≈
R1C1
1
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