FX828 datasheet(30/34 Pages) CMLMICRO

30 / 34 page

CTCSS/DCS/SELCALL Processor

FX828

D/828/4

Notes

Min.

Typ.

Max.

Units

Transmitter Modulator Drives:

Mod.1 Attenuator

Attenuation (at 0dB)

-0.3

0.2

Cumulative Attenuation Error

(wrt attenuation at 0dB)

-1.0

1.0

Output Impedance

600

Input Impedance (at 100Hz)

15.0

Mod.2 Attenuator

Attenuation (at 0dB)

-0.3

0.2

Cumulative Attenuation Error

(wrt attenuation at 0dB)

-0.6

0.6

Output Impedance

600

General Purpose Timer

Timing Period Range

255

Count Interval

Xtal/Clock Input

Pulse Width ('High' or 'Low')

40.0

Input Impedance (at 100Hz)

10.0

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

20.0

DAC

Range

312.5

2500

Step Size

312.5

Step Accuracy

-30.0

+30.0

Input Impedance (COMPIN)

Output Impedance (COMPOUT)

Notes:

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

At Tamb = 25°C, 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.

10. SUBAUDIO, SELCALL and DCS.

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