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PDF MC33121 Data sheet ( Hoja de datos )
| Número de pieza | MC33121 | |
| Descripción | LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MC33121 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MC33121/D
MC33121
Low Voltage Subscriber
Loop Interface Circuit (SLIC)
Thin Film Silicon Monolithic Integrated Circuit
The MC33121 is designed to provide the interface between the 4–wire side of
a central office, or PBX, and the 2–wire subscriber line. Interface functions
include battery feed, proper loop termination AC impedance, hookswitch
detection, adjustable transmit, receive, and transhybrid gains, and single/
double fault indication. Additionally, the MC33121 provides a minimum of 58 dB
of longitudinal balance (4–wire and 2–wire).
The transmit and receive signals are referenced to analog ground, while
digital signals are referenced to digital ground, easing the interface to codecs,
filters, etc. The 2 status outputs (hookswitch and faults) and the Power Down
Input are TTL/CMOS compatible. The Power Down Input permits local
shutdown of the circuit.
Internal drivers allow the external loop current pass transistors to be standard
bipolar transistors (non–Darlington).
The MC33121 is available in a 20 pin DIP and a 28 pin PLCC surface mount
package.
• 58 dB Longitudinal Balance Guaranteed; 4–wire and 2–wire
• Transmit, Receive, and Transhybrid Gains Externally Adjustable
• Return Loss Externally Adjustable
• Proper Hookswitch Detection With 30 kΩ Leakage
• Single/Double Fault Indication With Shutdown for Thermal Protection
• Critical Sense Resistors Included Internally
• Standard Power Supplies: – 21.6 V to – 42 V, and + 5.0 V, ± 10%
• On–Hook Transmission
• Power Down Input (TTL and CMOS Compatible)
• Operating Ambient Temperature: – 40°C to + 85°C
• Available in a 20 Pin DIP and 28 Pin PLCC Package
20
1
28
1
P SUFFIX
PLASTIC PACKAGE
CASE 738
FN SUFFIX
PLCC
CASE 776
ORDERING INFORMATION
Device
Temperature
Range
Package
MC33121P
Plastic DIP
– 40° to + 85°C
MC33121FN
PLCC
TIP
RING
VCC
EP
BP
CP
TSI
RSI
CN
BN
EN
VEE
(BATTERY)
*
–
+
VEE
VCC
–
+
*
SIMPLIFIED BLOCK DIAGRAM
CURRENT
MIRROR
CURRENT
MIRROR
CURRENT
MIRROR
*
*
CURRENT
MIRROR
HOOK STATUS AND
FAULT DETECTION
AND BIAS CONTROL
CURRENT
MIRROR
CURRENT
MIRROR
+
–
BIAS +
–
MC33121
VDD (+5.0 V)
VDG
(DIG. GND)
PDI/ST2
ST1
VAG
(ANA. GND)
RXI
TXO
RFO
CF
VQB
* Indicates trimmed resistor
REV 1.0
4/96
©MOMoTtoOroRla,OInLc.A1996
MC33121
1
1 page  
20 VCC
VDD 15
+ 5.0 V
IL
TIP
VL RL
RING
IEP
0.01
RP
100
RP
0.01 100
RC
1.0 k
RS
9.1 k
RS
9.1 k
RC
1.0 k
19
EP
18
BP
17
CP
16
TSI
5
RSI
4
CN
3
BN
2
EN
1
VEE
– 24 V
Components shown for a 600 Ω system.
Three grounds are connected directly together.
MC33121
ST2/PDI 12
ST1 13
PDI/ST2
CT
0.1
ST1
VDG 14
VAG 9
RXI 10
RFO 8
TXO 11
CF 7
VQB 6
IRXI
RRX
RRF RRO 30.9 k
4.7 k 20.3 k
RECEIVE
IN (VRXI)
CRO
1.0 µF
TRANSMIT
OUT (VTX)
2.0 k 1.0 µF
+10.13 dB
301 CCF
1.0 µF
20 CQB (10 µF)
Figure 1. Test Circuit
368
VCM 0.01%
TIP
2.0 µF
368
0.01%
RING
1.0 Vrms
MC33121 TEST CIRCUIT
(FIGURE 1)
VTX V4
4–Wire Balance = 20 (log V4/VCM)
2–Wire Balance = 20 (log V2/VCM)
V2
0 dB DIFF.
AMPLIFIER
Figure 2. Longitudinal Balance Test
(Per IEEE–455)
368
0.01%
TIP
MC33121 TEST CIRCUIT
(FIGURE 1)
VB 368 RING
0.01%
Signal Balance = 20 (log VB/Vin)
Figure 3. Signal Balance Test
VRXI
Vin
0 dBm
1.0 kHz
MOTOROLA
MC33121
5
5 Page 
0.7
VEE = – 28 V
0.6 TA = 25°C
VDD = + 5.0 V
0.5 RRF = 3900
0.4 RRF = 6200
0.3 RRF = 10 k
0.2
0 200 400 600 800
RL, LOOP RESISTANCE (Ω)
Figure 23. IC Power Dissipation versus
Loop Resistance and RRF
0.4
0.3
0.2
10 k
6.2 k
VEE = – 28 V
TA = 25°C
RP = 100 Ω
0.1
RRF = 3.9 k
0
0
200 400
600
RL, LOOP RESISTANCE (Ω)
Figure 24. Transistor Power Dissipation
versus Loop Resistance and RRF
800
50
40
30
RS = 5.1 k
20
RS = 11 k
10
– 42 V ≤ VEE ≤ – 24 V
f = 60 Hz AND 1.0 kHz
CT > 0.1 µF FOR 1.0 kHz
0 CT > 1.0 µF FOR 60 Hz
20 30
40
IL, LOOP CURRENT (mA)
Figure 25. Maximum Longitudinal Current
versus Loop Current
20
16
RT = 200 k
f = 1.0 kHz
12
8.0
RT = 20 k
f = 1.0 kHz
4.0
0
0.1
ST2
RT
VEE = – 28 V
TA = 25°C
CT IL = 20 mA
RS = 9.1 k
RT = 200 k
f = 60 Hz
RT = 20 k
f = 60 Hz
1.0
CT (µF)
10
Figure 26. Maximum Longitudinal Current
versus CT, RT and Frequency
MOTOROLA
MC33121
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MC33121.PDF ] | |
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