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參數資料
| 型號： | MC33121 |
| 廠商： | Motorola, Inc. |
| 英文描述： | LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT |
| 中文描述： | 低電壓用戶環路接口電路 |
| 文件頁數： | 3/32頁 |
| 文件大小： | 570K |
| 代理商： | MC33121 |
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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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