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參數(shù)資料
| 型號： | LE79R251JC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大小： | 533K |
| 代理商： | LE79R251JC |
P R E L I M I N A R Y
Le79R251 ISLIC Data Sheet
11
DC Specifications
Unless otherwise specified, test conditions are: V
CC
= 5 V, R
MGP
= R
MGL
= 1 k
, BATH = –68 V, BATL =
–36 V, BATP = +52 V, R
RX
= 150 k
, R
L
= 600
, R
SA
= R
SB
= 200 k
, R
FA
= R
FB
= 50
, C
HP
= 22 nF,
C
AD
= C
BD
= 22 nF, I
RSN
= 50 μA. DC-feed conditions are normally set by the ISLAC device. When the
Le79R251 device is tested by itself, its operating conditions must be simulated as if it were connected to
an ideal ISLAC device.
No.
Item
Condition
Min
Typ
Max
Unit
Note
1
Two-wire loop voltage,
including offset (V
A
-V
B
)
Standby mode, open circuit,
|VBH| < 55 V
|VBH| > 55 V
GND – VB
Any Active mode (does not
include OHT), RL = 600
,
I
RSN
= 50 μA
OHT mode, RL = 2200
,
I
RSN
= 20 μA
|VBH| – 9
48
13.88
19.8
|VBH|–8
52
15
22
|VBH|–7
55
55
16.13
V
2
2
Feed resistance per leg at
pins AD & BD
Standby mode
130
250
375
3
Feed current limit
Feed current
Standby mode, RL = 600
Standby mode, RL = 2200
Standby mode
A to VBH
B to Ground
18
30
40
mA
IMT current
44.6
56
μA
ILG current
25.7
25.7
4
Ternary input voltage
boundaries for LD pin. Mid-
level input source must be
Vref.
Low boundary
Medium boundary
High boundary
Input high current
Input low current
Mid-level current
VREF–0.3
CREF – 1
–20
–20
–20
0.6
VREF+0.3
20
20
20
V
V
V
μA
μA
μA
2
2
2
5
Logic Inputs P1, P2, P3
Input high voltage
Input low voltage
Input high current
Input low current
2.0
–20
–20
0.6
20
20
V
V
μA
μA
6
VTX output offset
–50
+50
mV
7
VREF input current
VREF = 1.4 V, Active Low Battery
I
LOOP
= -25 mA
I
LOOP
= 0 mA
60
200
120
300
μA
2
8
CREF input current
β
, DC Ratio of VSAB to
loop voltage:
V
V
SA
–
CREF = 3.3 V
1
10
μA
2
9
Tj < 145°C, VSA – VSB = 22 V
0.00606
0.00667
0.00740
V/V
10
Gain from VLB pin to A or B
pin
41
45
49
V/V
2
11
VLB pin input current
VLB = VREF
±
1V
ILOOP = 10 mA
–100
100
μA
2
12
ILOOP/IMT
290
300
350
A/A
13
ILONG/ILG
ILONG = 10 mA
580
600
700
A/A
14
Input current, SA and SB
pins
Active modes
1.0
3.0
μA
2
15
K1
Incremental DC current gain
462
500
538
A/A
2
16
ISA/IMT
Disconnect, ISA = 2 mA
5.0
6
7
17
ISB/ILG
Disconnect, ISB = 2 mA
10
12
14
18
VSAB output offset
-20
20
mV
19
IMT output offset
–3
0
3
μA
390 pf
RT Network
30 k
30 k
VREF
β
V
SB
---------------------------
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