GMSK Modem Data Pump
Page 33 of 37
MX909A PRELIMINARY INFORMATION
6.1.3 Operating Characteristics
For the following conditions unless otherwise specified:
Xtal Frequency = 4.096MHz, Bit Rate = 8k bits/sec, Noise Bandwidth = Bit Rate,
= 5.0V @ T = 25°C
V
DD
AMB
Notes
Min.
Typ. Max.
Units
DC Parameters
I
I
I
I
(not powersaved) (V = 3.3V)
1
1
1
1
2.2
0.4
3
3.3
0.6
4.5
1.4
mA
mA
mA
mA
DD
DD
DD
DD
DD
(powersaved)
(not powersaved)
(powersaved)
(V = 3.3V)
DD
0.9
AC Parameters
Tx Output
TXOUT Impedance (not powersaved)
TXOUT Impedance (powersaved)
Signal Level
2
2
3
4
1.0
300
1.0
4
2.5
kΩ
kΩ
0.9
1.1
6
V
P-P
Tx Data Delay
bits
Rx Input
RXIN Impedance (at 100Hz)
RXIN Amp Voltage Gain (input = 1mV
10.0
0.7
MΩ
at 100Hz)
500
1.0
3.5
V/V
RMS
Input Signal Level
5
6
1.3
V
P-P
Rx Data Delay
bits
Xtal/Clock Input
'High' Pulse Width
'Low' Pulse Width
Input Impedance (at 100Hz)
7
7
40
40
ns
ns
10.0
20
MΩ
dB
Gain (input = 1 mV
µC Interface
at 100Hz)
RMS
Input Logic "1" Level
Input Logic "0" Level
8, 9
8, 9
70%
V
V
DD
30%
5.0
DD
Input Leakage Current (V = 0 to V
)
DD
8, 9
8, 9
9
µA
pF
ꢀ5.0
IN
Input Capacitance
10.0
Output Logic "1" Level (l = 120µA)
90%
V
DD
OH
Output Logic "0" Level (l = 360µA)
9,10
10
10%
10
V
OL
DD
'Off' State Leakage Current (V
= V
)
DD
µA
OUT
6.1.3.1 Operating Characteristics Notes:
1. Not including any current drawn from the modem pins by external circuitry.
2. Small signal impedance
3. For "1111000011110000..." bit sequence (output level is proportional to V ).
DD
4. Measured between issuing first task after idle and the center of the first bit at TXOUT see Figure 7)
5. For optimum performance, measured at RXAMPOUT pin, for a "...11110000..." bit sequence
6. Measured between center of last bit of an Rx single byte or Frame Sync at RXIN and an IRQ
the host µC.
interrupt to
7. Timing for an external input to the CLOCK/XTAL pin.
8. WR ,RD , CS, A0 and A1 pins.
9. D0 - D7 pins.
10. IRQ pin.
¤2001 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480134.005
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