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| 型號(hào)： | LE79R251JC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 13/22頁(yè) |
| 文件大?。?/td> | 533K |
| 代理商： | LE79R251JC |
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P R E L I M I N A R Y
Le79R251 ISLIC Data Sheet
13
Ringing Specifications
Current-Limit Behavior
Thermal Shutdown Fault Indications
Note:
1.
These tests are performed with the following load impedances:
Frequency < 12 kHz – Longitudinal impedance = 500
; metallic impedance = 300
Frequency > 12 kHz – Longitudinal impedance = 90
; metallic impedance = 135
2.
Not tested or partially tested in production. This parameter is guaranteed by characterization or correlation to other tests.
3.
This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
11
Total harmonic distortion level
2-wire
4-wire
4-wire overload level at VTX
300 Hz to 3400 Hz
0 dBm
11.2 dBm
–12 dBm
–0.8 dBm
RLOAD = 600
Active modes, R
L
= 600
2-wire
4-wire
2-wire
4-wire
±1
–50
–40
–48
–38
dB
dB
dB
dB
Vp
2
12
Idle channel noise
C-message
Weighted
Psophometric
Weighted
+7
–7
–83
–97
+11
–79
dBrnC
dBmp
13
Longitudinal balance
(IEEE method)
Normal Polarity
L - T
200 to 1000 Hz
T
A
= –40°C to 85°C
1000 to 3400 Hz
T
A
= –40°C to 85°C
58
53
53
48
63
58
dB
2
2
T - L
200 to 3400 Hz
40
L - T
IL = 50 to 3400 Hz
63
2
Reverse Polarity
L - T
200 to 1000 Hz
T
A
= –40°C to 85°C
50
48
14
PSRR (VBH, VBL, VBP)
50 to 3400 Hz
3.4 K to 50 kHz
25
45
40
3,4
1, 2, 4
15
PSRR (VCC)
50 to 3400 Hz
3.4 K to 50 kHz
25
45
35
3, 4
1, 2, 4
16
Longitudinal AC current per wire
F = 15 to 60 Hz Active mode
20
30
mArms
2
17
Metering distortion
Freq = 12 kHz 2.8 Vrms
Freq = 16 kHz
metering load = 200
40
56
dB
2
No.
Item
Condition
Min
Typ
Max
Unit
Note
1
Peak Ringing Voltage
Active Internal Ringing
(VBP-VBH) - 10 V
133
V
7
No.
SLIC Mode
Condition
Min
Typ
Max
Unit
Note
1
Disconnect
Applied fault between ground and T/R
VBH applied to Tip or Ring
1
VBH/200K
100
μA
A
6
2
Tip Open
Short to GND
30
40
mA
3
Standby
Short Tip-to-VBH
Short Ring-to-GND
30
30
45
40
4
Active Ringing
ISLAC generating internal ringing
100
No.
Fault
Indication
1
No Fault
ILG, IMT operates normally (Vref ±1V)
2
Thermal Shutdown
ILG, IMT above 2.8 V
No.
Item
Condition
Min
Typ
Max
Unit
Note
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