Call Progress Tone Detector

FX643

© 1996 Consumer Microcircuits Limited

10

D/643/4

Operating Characteristics

For the following conditions unless otherwise specified:

Xtal Frequency = 3.579545MHz, S/N = 16 dB, Noise Bandwidth = 5 kHz,

Notes

Min.

Typ.

Max.

Units

DC Parameters

1

0.5

1.0

mA

1

0.3

0.7

mA

AC Parameters

SIGIN pin

Input Impedance (at 100Hz)

2

0.35

M

Ω

Minimum Input Signal Level

3

-40

dB

Input Signal Dynamic Range

3

40

dB

Signal to Noise Ratio

16

dB

Clock Input

'High' Pulse Width

4

40

ns

'Low' Pulse Width

4

40

ns

Input Impedance (at 100Hz)

10

M

Ω

Gain (I/P = 1mV rms at 100Hz)

20

dB

Logic Interface

Input Logic "1" Level

5

80%

Input Logic "0" Level

5

20%

5

5.0

+5.0

µA

Input Capacitance

5

10.0

pF

6

90%

6

10%

Notes:

1.

Not including any current drawn from the device pins by external circuitry.

2.

Small signal impedance over the frequency range 100Hz to 2000Hz and at 5.0V.

3.

The input level is not critical as the detector uses a stochastic algorithm.

4.

Timing for an external input to the XTAL/CLOCK pin.

5.

ENABLE pin.

6.

DETECT1, DETECT2 and DETECT3 pins.