Tone Detector

FX105A

© 1999 Consumer Microcircuits Limited

13

D/105A/5

Operating Characteristics

For the following conditions unless otherwise specified:

Notes

Min.

Typ.

Max.

Units

Static Parameters

2

-

0.9

3.0

mA

Amplifier Input Impedance

-

200

-

k

Ω

Digital Output Impedance

-

500

-

Ω

Analogue Output Impedance

-

1000

-

Ω

Dynamic Parameters

Input Signal

Amplitude

2

-

-

1.0

Vrms

Frequency

40

-

20,000

Hz

Response Threshold

1,2

-

30

-

mVrms

Deresponse Threshold

1,2

-

10

-

mVrms

BW Range

4

5.6

-

10

Signal to Noise Performance

-6

-9

-

dB

-

30

-

dB

-

20

-

dB

VCO

Frequency

3

240

-

120,000

Hz

-

-100

-

ppm/°C

-

2330

-

ppm/V

Amplifier

Open Loop Gain

-

60

-

dB

Gain Bandwidth Product

-

1.0

-

MHz

Closed Loop Gain

-

0

-

dB

Word Commutating Filter

2

-

25.0

-

mVrms

Notes:

1.

2.

3.

Observing pins 13, 14 or 15 (D4/P3 package) will cause a frequency shift due to additional

loading. If tuning the centre frequency by observing the VCO, design in a buffer amplifier

between pin 15 and the probe/calibration point and tune with no input signal. Otherwise, tune

by observing the detect output band edges while sweeping the input signal. The frequency at

pin 15 is 6xfo, while at pins 13 and 14 the frequency is 3xfo.

4.