SC9270C/D 查看數據表（PDF） - Silan Microelectronics

零件编号

产品描述 (功能)

生产厂家

SC9270C/D

DTMF RECEIVER

Silan Microelectronics 

Silan

Semiconductors

SC9270C/D

TIMING DIAGRAM

D

EVENTS

Vin

ESt

St/GT

DATA

OUTPUTS

Q1 ~ Q4

StD

OUTPUT

TOE

A

tREC

B

tREC

TONE # n

tDP

C

tID

tDA

E

F

G

tDO

TONE DROPOUT

TONE # n+1

TONE # n+1

tGTP

tGTA

DECODED TONE # n -1

tPSTD

tPQ

DECODED TONE#n

HIGH IMPEDANCE

VTst

DECODED TONE # n+1

tPTE

tPTD

Figure 4. Timing diagram

EXPLANATION OF EVENTS

A. Short tone bursts: detected. Tone duration is invalid.

B. Tone #n is detected. Tone duration is valid. Decoded

to outputs.

C. End of tone #n is detected and validated.

D. 3 State outputs disabled (high impedance).

E. Tone #n + 1 is detected. Tone duration is valid.

Decoded to outputs.

F. Tristate outputs are enabled. Acceptable drop out of

tone #n + 1 does not negister at outputs.

G. End of tone #n + 1 is detected and validated.

EXPLANATIONN OF SYMBOLS

Vin: DTMF composite input signal.

tREC :Maximum DTMF signal duration not detected as

valid.

tREC: Minimum DTMF Signal duration required for valid

recognition.

tID: Minimum time between valid DTMF signals.

tDO: Maximum allowable dropout during valid DTMF

signal

tDP: Time to detect the presence of valid DTMF signals.

tDP: Time to detect the absence of valid DTMF signals.

tGTP: Guard Time, Tone present.

tGTP: Guard Time, Tone absent.

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2001.04.27

7

Share Link: