FX818D2 datasheet(23/26 Pages) CMLMICRO

23 / 26 page

CTCSS Signalling Processor

FX818

D/818/4

Notes

Min.

Typ.

Max.

Units

Audio Band-Pass Filter

Passband

300

3000

Passband Gain (at 1.0kHz)

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

-2

+0.5

Stopband Attenuation

33.0

Residual Hum and Noise

-50.0

dBp

Alias Frequency

kHz

Output Impedances

TX SUB-AUDIO OUT and (Enabled)

2.0

RX AUDIO OUT

(Disabled)

500

Rx Amp and Summing Amp

Open Loop Gain

(I/P = 1mV at 100Hz)

70.0

Unity Gain Bandwidth

5.0

MHz

Input Impedance

(at 100Hz)

Ω

Output Impedance

(Open Loop)

6.0

Ω

Transmitter Modulator Drives:

Mod.1 Attenuator

Attenuation (at 0dB)

-0.2

0.2

Cumulative Attenuation Error

(wrt attenuation at 0dB)

-1.0

1.0

Output Impedance

600

Ω

Input Impedance (at 100Hz)

15.0

Ω

Mod.2 Attenuator

Attenuation (at 0dB)

-0.2

0.2

Cumulative Attenuation Error

(wrt attenuation at 0dB)

-0.6

0.6

Output Impedance

600

Ω

General Purpose Timer

Timing Period Range

242

Count Interval

0.95

Xtal/Clock Input

Pulse Width ('High' or 'Low')

40.0

Input Impedance (at 100Hz)

10.0

Ω

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

20.0

Notes:

At VDD = 5.0V only. Signal levels or currents are proportional to VDD.

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

Small signal impedance, at VDD = 5.0V and Tamb = 25°C.

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

With input gain components set as recommended in Figure 2.

IRQN pin.

From one tone to another tone.

See filter response (Figure 3).

Measured at MOD1 or MOD2 output.

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