CMX850 查看數據表（PDF） - CML Microsystems Plc
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CMX850 Datasheet PDF : 103 Pages
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Communications Controller
CMX850
Package
L8
68
69
70
71
72
73
74
DVSS
WEN
OEN
CSN1
CSN2
CSN3
RESETN
Signal
75
VCAP
76
AVDD
77
VREF
78
VINA
79
VINB
80
AVSS
81
LINERXF
82
LINERXBN
83
LINERXN
84
LINERXP
85
PHONERXF
86
PHONERXN
87
PHONERXP
88
AVSS
89
VBIAS
Power
O/P
O/P
O/P
O/P
O/P
I/P
O/P
Power
O/P
I/P
I/P
Power
O/P
I/P
I/P
I/P
O/P
I/P
I/P
Power
O/P
Description
The digital negative supply rail (ground).
External memory read/~write control.
External memory output enable (active low).
External memory chip select #1 (active low).
External memory chip select #2 (active low).
External memory chip select #3 (active low).
Chip reset (active low). Requires an external 100k Ω pullup
resistor to DVDD.
Decoupling capacitor
The analogue positive supply rail. Levels and thresholds within
the modem are proportional to this voltage.
A/D converter voltage reference output.
A/D converter input A. This input should be carefully decoupled
to AVSS to avoid instability in readings.
A/D converter input B. This input should be carefully decoupled
to AVSS to avoid instability in readings.
The analogue negative supply rail (ground).
The output of the Line Rx Input Amplifier.
An auxiliary inverting input to the Line Rx Input Amplifier,
switched in parallel with LINERXN to boost gain.
The inverting input to the Line Rx Input Amplifier.
The non-inverting input to the Line Rx Input Amplifier.
The output of the Phone Rx Input Amplifier.
The inverting input to the Phone Rx Input Amplifier.
The non-inverting input to the Phone Rx Input Amplifier.
The analogue negative supply rail (ground).
Internally generated bias voltage of approximately AVSS/2,
except when the device is in Powersave mode, when VBIAS
will discharge to AVSS. Should be decoupled to AVSS by a
capacitor mounted close to the device pins.
© 2003 CML Microsystems Plc
8
D/850/6
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