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IL9170D

更新时间： 2024-01-20 05:12:35

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IL9170D 技术参数

IL9170N, IL9170D

Operation description

The IC detects all sixteen standard DTMF signals and converts them into corresponding digital

Input of the IC is composed of input operational amplifier and three filters - pre-filter, filter of

code.

low- frequency group, filter of high-frequency group.

The signal received at the input of IC, is supplied to inverting input of operational amplifier V_N,

which gain ratio is set by external components (at typical application gain equals 1). From the

operational amplifier output signal is supplied to pre-filter. Preliminary filter is a band rejection filter

and is designed to suppress frequencies to 440 Hz. After filtering DTMF signal is simultaneously

supplied to filter high and low groups. Filter low-frequency group - band filter that passes only the low

tone group. Filter high-frequency group - band-pass filter which passes only the high-tone group.

Allocated signals are amplified and passed through to the frequency detector. Frequency detector

determines the frequency of signals received from each filter, code detector converts this information

in to 4-bit code, which goes to the latch output. Output latches are designed for the reception,

transmission and storage of 4-bit code. When a high-level signal at the output DV, the tone code

can be read from D0 - D3 pins.

Control unit allows controlling intertone pause duration and the duration of the input DTMF

signal for the given values of R3 and C4 (Fig. 4).

Figure 4 provides application diagram. Operation timing diagram of IC is presented in

Figure 5.

1...3 4 567 8 9...12

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型号	品牌	描述	获取价格	数据表
IL9170N	INTEGRAL	DTMF Signaling Circuit, PDIP18,	获取价格
IL9200AD	INTEGRAL	Telephone Circuit	获取价格
IL9200AN	INTEGRAL	Telephone Circuit	获取价格
IL9270	INTEGRAL	DTMF RECEIVER High-Performance Silicon-Gate CMOS	获取价格
IL9270D	INTEGRAL	DTMF RECEIVER High-Performance Silicon-Gate CMOS	获取价格
IL9270N	INTEGRAL	DTMF RECEIVER High-Performance Silicon-Gate CMOS	获取价格