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參數(shù)資料
型號(hào): MC33121
廠商: Motorola, Inc.
英文描述: LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT
中文描述: 低電壓用戶環(huán)路接口電路
文件頁數(shù): 3/32頁
文件大小: 570K
代理商: MC33121
MC33121
MOTOROLA
3
ELECTRICAL CHARACTERISTICS
(VEE = – 24 V, VDD = + 5.0 V, unless otherwise noted. VCC = VAG = VDG = 0 V, TA = 25
°
C, see Figure 1.)
Characteristic
Symbol
Min
Typ
Max
Unit
LOOP FUNCTIONS
Loop Current
Maximum (RRF = 4.7 k, RL = 10
)
Nominal (RRF = 4.7 k, RL = 367
)
Minimum (RRF = 4.7 k, RL = 796
)
Battery Feed Resistance (RRF = 4.7 k, RL = 796
)*
Hookswitch Threshold
On–to–Off Hook
Off–to–On Hook
IL(max)
IL
IL(min)
37
21
16
41
27
17.5
51
34
mA
RBF
475
575
675
RNF
RFN
2.0
4.1
7.7
10
k
Fault Detection Threshold
Ring–to–Ground (RL = 367
)
Tip–to–Battery (RL = 367
)
RRG
RTB
600
600
1100
1100
* Calculated from [(24/IL(min)) – 796]
GAIN LEVELS
Transmit Voltage Gain (CP, CN to TXO)
GTX1
0.328
V/V
Transmit Voltage Gain (VTX/VL)
VL = 0 dBm, f = 1.0 kHz
VL = 0 dBm, f = 3.4 kHz, with respect to GTX2
VL = + 3.0 dBm, f = 1.0 kHz, with respect to GTX2
VL = – 48 dBm, f = 1.0 kHz, with respect to GTX2
GTX2
– 0.3
– 0.1
– 0.15
0
0
0
±
0.1
0.3
0.1
0.15
dB
Transmit Distortion (at Pin 11)
(f = 300 Hz to 4.0 kHz, – 40 dBm
VT–R
+ 5.0 dBm)
THDT
0.05
%
Receive Current Gain (IEP/IRXI)
Receive Voltage Gain (VL/VRXI) (RL = 600
)
VRXI = 0 dBm, f = 1.0 kHz
VRXI = 0 dBm, f = 3.4 kHz, with respect to GRX2
VRXI = + 3.0 dBm, f = 1.0 kHz, with respect to GRX2
VRXI = – 48 dBm, f = 1.0 kHz, with respect to GRX2
GRX1
94
102
110
mA/mA
GRX2
– 0.3
– 0.1
– 0.15
0
0
0
±
0.1
0.3
0.1
0.15
dB
Receive Distortion
(f = 300 Hz to 4.0 kHz, – 40 dBm
VRXI
+ 5.0 dBm)
THDR
0.05
%
Return Loss (Reference = 600
resistive, f = 1.0 kHz)
RL
30
> 40
dB
Transhybrid Rejection (RL = 600
resistive, f = 1.0 kHz, Figure 4)
LONGITUDINAL SIGNALS
(VCM = 1.0 Vrms, see Figures 1 and 2)
2–Wire Balance, f = 1.0 kHz, Zac = 600
(@ Tip/Ring)
4–Wire Balance, f = 1.0 kHz, Zac = 600
(@ VTX)
THR
44
dB
LB
58
58
64
64
dB
2–Wire Balance, f = 330 Hz, Zac = 600
(@ Tip/Ring)
4–Wire Balance, f = 330 Hz, Zac = 600
(@ VTX)
58
58
64
64
2–Wire Balance, f = 3.3 kHz, Zac = 600
(@ Tip/Ring)
4–Wire Balance, f = 3.3 kHz, Zac = 600
(@ VTX)
53
53
60
60
2–Wire Balance, f = 1.0 kHz, Zac = 900
(@ Tip/Ring)
4–Wire Balance, f = 1.0 kHz, Zac = 900
(@ VTX)
62
62
Signal Balance, f = 1.0 kHz (Figure 3)
40
55
Longitudinal Impedance, RS = 9100
ZLong
ILong(max)
150
180
210
Maximum Longitudinal Current, per side
f = 1.0 kHz, ILoop = IL(min), CT = 0.1
μ
F
VEE = – 42, VCM = 5.12 Vrms
8.5
16
mA
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