MX919B Просмотр технического описания (PDF) - MX-COM Inc
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MX919B Datasheet PDF : 48 Pages
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4-Level FSK Modem Data Pump
Page 42 of 47
6.1.3 Operating Characteristics
For the following conditions unless otherwise specified:
Xtal Frequency = 4.9152MHz, Symbol Rate = 4800 symbols/sec,
Noise Bandwidth = 0 to 9600Hz, VDD = 5.0V @ TAMB = 25°C
DC Parameters
IDD
IDD (VDD = 3.3V)
IDD (Powersave Mode)
IDD (Powersave Mode, VDD = 3.3V)
AC Parameters
TX Output
TXOUT Impedance
Signal Level
TXIMP = 0
TXIMP = 1
Output DC Offset with respect to VDD/2
RX Input
RXIN Impedance (at 100Hz)
RXIN Amp Voltage Gain (input = 1mVRMS at 100Hz)
Input Signal Level
DC Offset with respect to VDD/2
XTAL/CLOCK INPUT
‘High’ Pulse Width
‘Low’ Pulse Width
Input Impedance (at 100Hz)
Inverter Gain (input = 1mVRMS at 100Hz)
µC Interface
Input Logic ‘1’ Level
Input Logic ‘0’ Level
Input Leakage Current (VIN = 0 to VDD)
Input Capacitance
Output Logic ‘1’ Level (IOH = 120µA)
Output Logic ‘0’ Level (IOL = 360µA)
‘Off’ State Leakage Current (VOUT = VDD)
MX919B PRELIMINARY INFORMATION
Notes Min. Typ. Max. Units
1
4.0 10.0 mA
1
2.5 6.3 mA
1
1.5
mA
1
0.6
mA
2
1.0 2.5
kΩ
3
0.8
1.0
1.2
VP-P
3
0.88 1.1 1.32 VP-P
4
-0.25
0.25
V
10.0
MΩ
300
V/V
5
0.7
1.0
1.3
VP-P
5
-0.5
0.5
V
6
40
ns
6
40
ns
10.0
MΩ
20
dB
7,8 70%
7,8
7,8 -5.0
VDD
30% VDD
5.0
µA
7,8
10.0
pF
8
92%
8,9
9
VDD
8%
VDD
10
µA
6.1.3.1 Operating Characteristics Notes:
1. Not including any current drawn from the modem pins by external circuitry other than the Xtal oscillator.
2. Small signal impedance.
3. Measured after the external RC filter (R4/C5) for a "+3 +3 -3 -3...." symbol sequence, (Tx output level is
proportional to VDD).
4. Measured at the TXOUT pin with the modem in the Tx idle mode.
5. For optimum performance, measured at RXAMPOUT pin, for a "...+3 +3 -3 -3..." symbol sequence,
TXIMP = 0 or 1, The optimum level and DC offset values are proportional to VDD.
6. Timing for an external input to the XTAL/CLOCK pin.
7. WR , RD , CS , A0 and A1 pins.
8. D0 - D7 pins.
9. IRQ pin.
©2001 MX•COM, INC.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480170.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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