73M223

1200 Baud FSK Modem

4

ELECTRICAL CHARACTERSITICS

Unless otherwise specified, 4.5 <VDD <13 VDC, VSS = 0 VDC, -25

° C <TA

POWER SUPPLY

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

VDD Voltage Supply Range

4.5

13

V

Supply Current

VDD = 5V 25

° C

2.0

mA

VDD = 12V 25

° C

5.0

mA

Digital Inputs

Input Low Voltage VIL

VSS - 0.3

VSS + 1.5

V

Input High Voltage VIH

VDD - 1.5

VDD + 0.3

V

Input Low Current IIL

-1

µA

Input High Current IIH

1µA

Digital Outputs

Output Low Voltage VOL

IOL < 1 µA

0.05

V

Output High Voltage VOH

IOL < -1 µA

VDD = 5V

4.95

V

Output Low Current IOL

VOL = 0.4V

VDD = 5V

0.5

mA

Output High Current IOH

VOH = 4.5V

VDD = 5V

-0.2

mA

Analog Input Level @ RXA

Centered at VDD/2 + 0.5V

0.2

VDD/4

Vpp

Analog Input Level @ RXF

*DC Level between VDD & VSS

0.2

VDD/2

VDC

Error Rate

S/N = 8 dB Input @ RXF

Analog Output Level @ TXA

RL

≥ 10K

7; = 0

VDD/4

Vpp

7; = 1

VDD/2

VDC

XTAL = 3.1872 MHz

TXD=1

1302

Hz

Output Frequency @ TXA

TXD=0

2097

Hz

2nd to 14th Harmonics

-60

-50

dB

Output Harmonics

15th Harmonic

-20

dB

Input Filter (RFX)

*Input = 200 mVp-p to VDD/2 Vp-p

Lower 3 dB Corner

760

Hz

Upper 3 dB Corner

2625

Hz

* Note: The 73M223 RXF input is AC coupled internally but the DC value of the input must be between the two

supplies VDD & VSS.