CTCSS Signalling Processor

FX818

© 1997 Consumer Microcircuits Limited

23

D/818/4

Notes

Min.

Typ.

Max.

Units

Audio Band-Pass Filter

Passband

8

300

-

3000

Hz

Passband Gain (at 1.0kHz)

8

-

0

-

dB

Passband Ripple (w.r.t. gain at 1.0kHz)

8

-2

-

+0.5

dB

Stopband Attenuation

8

33.0

-

-

dB

Residual Hum and Noise

-

-50.0

-

dBp

Alias Frequency

-

63

-

kHz

Output Impedances

TX SUB-AUDIO OUT and (Enabled)

-

2.0

-

k

RX AUDIO OUT

(Disabled)

-

500

-

k

Rx Amp and Summing Amp

Open Loop Gain

(I/P = 1mV at 100Hz)

-

70.0

-

dB

Unity Gain Bandwidth

-

5.0

-

MHz

Input Impedance

(at 100Hz)

10

-

-

M

Ω

Output Impedance

(Open Loop)

-

6.0

-

k

Ω

Transmitter Modulator Drives:

Mod.1 Attenuator

Attenuation (at 0dB)

-0.2

0

0.2

dB

Cumulative Attenuation Error

(wrt attenuation at 0dB)

-1.0

-

1.0

dB

Output Impedance

3

-

600

-

Ω

Input Impedance (at 100Hz)

-

15.0

-

k

Ω

Mod.2 Attenuator

Attenuation (at 0dB)

-0.2

0

0.2

dB

Cumulative Attenuation Error

(wrt attenuation at 0dB)

-0.6

-

0.6

dB

Output Impedance

3

-

600

-

Ω

General Purpose Timer

Timing Period Range

1

-

242

ms

Count Interval

-

0.95

-

ms

Xtal/Clock Input

Pulse Width ('High' or 'Low')

4

40.0

-

-

ns

Input Impedance (at 100Hz)

10.0

-

-

M

Ω

Gain (I/P = 1mVrms at 100Hz)

20.0

-

-

dB

Notes:

1.

2.

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

3.

4.

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

5.

With input gain components set as recommended in Figure 2.

6.

IRQN pin.

7.

From one tone to another tone.

8.

See filter response (Figure 3).

9.

Measured at MOD1 or MOD2 output.