v.23 Compatible Modem
12
MX604 PRELIMINARY INFORMATION
Line Interface Notes:
ꢁ
ꢁ
ꢁ
The components 'Z' between points B and C should match the line impedance.
Device A2 must be able to drive 'Z' and the line.
R2: For optimum results R2 should be set so that the gain is V /5.0, i.e. R2 = 100kꢃ at V
=
DD
DD
5.0V, rising to 150kꢃ at V = 3.3V.
DD
ꢁ
R3: The levels in dB (relative to a 775mV
signal) at 'A', 'B' and 'C' in the line interface circuit are:
RMS
'A' = 20Log(VDD/5)
'B' = 'A' + 20Log(100kꢃ/R3)
'C' = 'B' - 6
VDD
3.3V
5.0V
'A'
-3.6dB
0dB
R3
'B'
'C'
-3.6dB
-3.5dB
-9.6dB
-9.5dB
100kꢃ
150kꢃ
6.
Performance Specification
6.1
Electrical Performance
Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device.
General
Min.
Max.
Units
Supply (V
- V
)
SS
-0.3
7.0
V
DD
Voltage on any pin to V
Current
-0.3
V
DD
+ 0.3
V
SS
V
-30
-30
-20
30
30
20
mA
mA
mA
DD
SS
V
Any other pins
DW / PDIP Package
Total Allowable Power Dissipation at T
= 25°C
800
mW
AMB
Derating above 25°C
Storage Temperature
Operating Temperature
13
125
85
mW/°C above 25°C
-55
-40
°C
°C
Operating Limits
Correct operation of the device outside these limits is not implied.
Notes
Min.
Max.
Units
Supply (V - V
)
SS
3.0
5.5
V
DD
Temperature
-40
85
°C
Xtal Frequency
1
3.575965
3.583125
MHz
Operating Limits Notes:
1. A crystal frequency of 3.579545MHz ±0.1% is required for correct FSK operation.
ꢀ1998 MXꢁCOM, INC.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480152.004
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CMLMICRO [ CML MICROCIRCUITS ]
