FX818 datasheet(22/26 Pages) CMLMICRO

22 / 26 page

CTCSS Signalling Processor

FX818

D/818/4

Operating Characteristics

For the following conditions unless otherwise specified:

Xtal Frequency = 4.032MHz

Audio Level 0dB ref = 308mVrms at 1kHz

VDD = 3.3V to 5.0V, Tamb = -40°C to +85°C.

Composite Signal = 308mVrms at 1kHz + 75mVrms Noise + 31mVrms Sub-Audio Signal

Noise Bandwidth = 5kHz Band Limited Gaussian

Notes

Min.

Typ.

Max.

Units

DC Parameters

At VDD = 3.3V

IDD (powersaved, VDD = 5.0V)

1, 2

0.6

1.0

IDD (powersaved, VDD = 3.3V)

1, 2

0.35

0.6

IDD (Tx/Rx Operating VDD = 5.0V)

1, 2

3.5

6.0

IDD (Tx/Rx Operating VDD = 3.3V)

1, 2

1.6

2.5

"C-BUS" Interface

Input Logic "1"

70%

VDD

Input Logic "0"

30%

VDD

Input Leakage Current (Logic "1" or "0")

-1.0

1.0

µA

Input Capacitance

7.5

Output Logic "1" (IOH = 120µA)

90%

VDD

Output Logic "0" (IOL = 360µA)

10%

VDD

"Off" State Leakage Current (Vout = VDD)

µA

AC Parameters

CTCSS Decoder

Sensitivity

(Pure CTCSS Tone)

-26.0

Response Time

(Composite Signal)

140

De-Response Time

(Composite Signal)

145

Frequency Range

253

CTCSS Detector - Fast Detect

Sensitivity

(Pure CTCSS Tone)

-26.0

Response Time

(Composite Signal)

56.0

Frequency Range

253

CTCSS Detector - Fast Predictive

Sensitivity

(Pure CTCSS Tone)

-26.0

Response Time

(Composite Signal)

37.0

Frequency Range

253

Decode Bandwidth

CTCSS Encoder

Frequency Range

253

Tone Frequency Resolution

0.3

Tone Amplitude Tolerance

-1.0

+1.0

Total Harmonic Distortion

2.0

FX818 Datasheet(PDF) 22 Page - CML Microcircuits

FX818 Datasheet(HTML) 22 Page - CML Microcircuits

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Datasheet Download

Link URL