le79231 Zarlink Semiconductor, le79231 Datasheet - Page 12

• Manufacturer Part Number: le79231
• Description: Intelligent Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

DC SPECIFICATIONS
Unless otherwise specified, test conditions are: VCC = 5 V, RMGP
BATL = –36 V, RRX = 150 kΩ, RL = 600 Ω, RSA = RSB = 200 kΩ, RFA = RFB = 50 Ω, CHP = 22 nF,
CAD = CBD = 22 nF, IRSN = 50 mA. DC-feed conditions are normally set by the VE790 series codec.
When the Le79231 ISLIC device is tested by itself, its operating conditions must be simulated as if it were
connected to an ideal codec.
No.
10
12
13
14
15
16
17
18
19
20
21
11
1
2
3
4
5
6
7
8
9
Two-wire loop voltage
(including offset)
Feed resistance per leg at
pins AD & BD
Feed current limit
IMT current
ILG current
Ternary input voltage
boundaries for LD pin.
Mid-level input source
must be V
Logic Inputs P1, P2, P3
VTX output offset
VREF input current
CREF input current
ß, DC Ratio of VSAB to
loop voltage:
Fault Indicator Threshold
Gain from VLB pin to A or
B pin,KLG
VLB pin input current
ILOOP/IMT
ILONG/ILG
Input current, SA and SB
pins
K1
ISA/IMT
ISB/ILG
VSAB output offset
IMT output offset
ILG output offset
β
=
-------------------------- -
V
SA
V
REF
Item
SAB
–
.
V
SB
Standby mode, open circuit,
|VBH| < 55 V
|VBH| > 55 V
GND − VB
Any Active mode (does not
include OHT),
OHT mode, RL = 2200 Ω
I
Standby mode
Feed current
Standby mode, RL = 600 Ω
Standby mode
A to VBH
B to Ground
Low boundary
Mid boundary
High boundary
Input high current
Input low current
Mid-level current
Input high voltage
Input low voltage
Input high current
Input low current
CREF = 3.3 V
Tj < 145° C, VSA – VSB = 22 V
Voltage Output on IMT
VLB = VREF ±1 V
Active modes
Incremental DC current gain
Disconnect, ISA = 2 mA
Standby mode, RL = 2200 Ω
VREF = 1.4 V
ILOOP = 10 mA
ILONG = 10 mA
Disconnect, ISB = 2 mA
RL = 600 Ω, I
RSN
= 20 µA
Zarlink Semiconductor Inc.
Condition
RSN
= 50 µA
12
+25° C
+85° C
–40° C
i
= RMGL
VREF−0.3
CREF−1
VBH–8
0.0088
13.88
462.5
i
19.8
44.6
Min
130
–20
–20
–50
275
565
2.0
2.8
48
18
28
28
–3
10
= 1 kΩ, BATH = –90 V,
-3
-1
4
CREF -
VBH–7
0.0097
V
0.3 V
Typ
108
300
500
250
605
1.0
7.0
3.6
1.4
51
15
22
34
56
47
51
50
30
12
REF
0
0
0
0
0
6
0
0
VREF+0.3
VBH–6
0.0106
CREF
16.13
537.5
Max
55.5
55.5
8.75
375
325
100
645
0.6
0.8
+50
3.0
45
20
20
16
3
3
1
RT Network
Unit
mA
mV
V/V
V/V
A/A
A/A
A/A
mV
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
Ω
V
V
V
V
V
V
V
30 k Ω
VREF
Note
30 k Ω
390 pf
2
2
2
2
2
2
2
2
2
2