AC Electrical Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Units

TRANSMITTER

Carrier Frequency Error

4Hz

Power Output

b

12

b

105

b

9

dBm

2nd Harmonic Energy

b

62

b

56

dBm

RECEIVE FILTER AND HYBRID

Hybrid Input Impedance

50

kX

(Pins 15 and 16)

FTLC Output Impedance

5

10

50

kX

Adjacent Channel Rejection

60

dB

Input to RXA1

DEMODULATOR (INCORPORATING HYBRID RECEIVE FILTER AND DISCRIMINATOR)

Carrier Amplitude

b

38

b

12

dBm

Bit Jitter

100

200

m

s

(

Bit Bias

Alternating 1 – 0 Pattern

5

10

%

Carrier Detect Trip Points

Off to On

b

38

b

36

b

34

dBm

On to Off

b

41

b

39

b

37

dBm

Carrier Detect Hystereisis

2

3

4

dB

The demodulator specifications apply to the 74VHC943 operating with a modulator having frequency accuracy phase jitter and harmonic content equal to or

better than the 74VHC943 modulator

AC Specification Circuit

TLF11679 – 3

6