CM8870P 查看數據表（PDF） - California Micro Devices Corp

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CM8870P

CMOS Integrated DTMF Receiver

California Micro Devices Corp 

CALIFORNIA MICRO DEVICES

CM8870/70C

AC Characteristics: All voltages referenced to VSS, VDD=5.0V ±5%, TA=-40°C to +85°C, fCLK=3.579545 MHz using

test circuit (Fig. 1) unless otherwise noted.

Parameter

Valid Input Signal Levels

(each tone of composite signal)

Positive Twist Accept

Negative Twist Accept

Freq. Deviation Accept Limit

Freq. Deviation Reject Limit

AC CHARACTERISTICS

Symbol Min

Typ

Max

-29

+1

27.5

869

10

10

1.5%±2Hz

±3.5%

Third Tone Tolerance

-16

Noise Tolerance

-12

Dial Tone Tolerance

Tone Present Detection Time

Tone Absent Detection Time

Min Tone Duration Accept

Max Tone Duration Reject

Min. Interdigit Pause Accept

Max. Interdigit Pause Reject

Propagation Delay (St to Q)

Propagation Delay (St to StD)

Output Data Set Up (Q to StD)

Propagation Delay (TOE to Q)

Crystal/Clock Frequency

Clock Output (OSC 2)

Enable

Disable

Capacitive

Load

tDP

tDA

t REC

t REC

tID

tDO

tPQ

tPStD

t QSt D

tPTE

tPTD

f CLK

C LO

+22

5

8

0.5

3

20

20

3.5759

6

9

3.4

50

300

3.5795

14

8.5

40

40

11

16

3.5831

30

Units

dBm

mVRMS

dB

dB

Nom.

Nom.

dB

dB

dB

mS

mS

mS

mS

mS

µS

µS

µS

µS

nS

nS

MHz

pF

Notes

1,2,3,4,5,8

2,3,4,8

2,3,5,8,10

2,3,5

2,3,4,5,8,9,13,14

2,3,4,5,6,8,9

2,3,4,5,7,8,9

Refer to

Timing Diagram

(User Adjustable)

Times shown are

obtained with

circuit in Fig. 1)

TOE = VDD

RL = 10KΩ

CL = 50pF

Notes:

1.

dBm = decibels above or below a reference power

of 1 mW into a 600 ohm load.

2.

Digit sequence consists of all 16 DTMF tones.

3.

Tone duration = 40mS. Tone pause = 40 mS.

4.

Nominal DTMF frequencies are used.

5.

Both tones in the composite signal have

an equal amplitude.

6.

Bandwidth limited (0 to 3 KHz) Gaussian Noise.

7.

The precise dial tone frequencies are

(350 Hz and 440 Hz) ±2%.

8.

For an error rate of better than 1 in 10,000

9.

Referenced to lowest level frequency component

in DTMF signal.

10. Minimum signal acceptance level is measured with

specified maximum frequency deviation.

11. Input pins defined as IN+, IN-, and TOE.

12.

External voltage source used to bias VREF.

13. This parameter also applies to a third tone injected onto

the power supply.

14. Referenced to Figure 1. Input DTMF tone level

at -28 dBm.

© 2000 California Micro Devices Corp. All rights reserved.

9/28/2000 215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

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