IN9270N 데이터 시트보기 (PDF) - Integral Corp.

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IN9270N

DTMF RECEIVER High-Performance Silicon-Gate CMOS

Integral Corp. 

IN9270

TIMING REQUIREMENTS (All Voltages referenced to GND. VCC = 5.0 V, GND = 0 V, TA = -10 to

+70°C, FCLK = 3.579545 Mhz, using test circuit of Figure 5)

Symbol

Parameter

Guaranteed

Limits

Min Max Unit

Notes

tDP

Tone Present Detection Time (Figure 7)

5

18 ms

Refer to

tDA Tone Absent Detection Time (Figure 7)

0.5

10 ms

Fig. 7

tREC Maximum Tone Detection Accept (Figure 7)

40 ms

(User

Adjustable)

tREC Minimum Tone Detection Reject (Figure 7)

20

ms

tID

Maximum Interdigit Pause Accept (Figure 7)

40 ms

Refer to

“Guard Time

tDO Minimum Interdigit Pause Reject (Figure 7)

20

ms Adjustment”

tPQ

Maximum Propagation Delay (St to Q) (Figure 7)

11

µs

OE = VCC

tPSED Maximum Propagation Delay (St to StD) (Figure 7)

16

µs

tQSED Maximum Output Data Set Up (Q to StD) (Figure 7)

5

µs

tPTE

Maximum

ENABLE

Propagation Delay

75

ns RL= 10 KΩ

CL= 50 pF

tPTD

(OE to Q) (Figure 7) DISABLE

460 ns

fCLK Crystal/Clock Frequency

3.5759 3.581 MHz

CLO

Notes:

Clock Output (C2)

Capacitive

Load

30 pF

1. dBm = decibels above or below a reference power of 1 mW into a 600 Ω load.

2. Digit sequence consists of all 16 DTMF tones.

3. Tone duration = 40 ms, Tone pause = 40 ms.

4. Nominal DTMF frequencies are used.

5. Both tones in the composite signal have an equal amlitude.

6. Tone pair is deviated by ±1.5% ±2 Hz.

7. Bandwidth limited (3 KHz) Gaussian Noise.

8. The precise dial tone frequencies are (350 Hz and 440 Hz) ±2%.

9. For an error rate of less than 1 in 10,000.

10. Referenced to the lowest level frequency component in DTMF signal.

Figure 1. Typical Filter Characteristic

5

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