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MC33121 Datasheet

LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT

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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 kLeakage
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


Motorola Electronic Components Datasheet

MC33121 Datasheet

LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT

No Preview Available !

MAXIMUM RATINGS
Characteristic
Symbol
Value
Unit
Supply Voltage
(with respect to VCC)
(with respect to VDG)
VEE
VDD
– 60, + 0.5
– 0.5, + 7.0
Vdc
Voltage
@ PDI, (with respect to VDG)
@ CP, CN
EP, TSI
BP
RSI, EN
BN
Vin Vdc
– 0.5, + 7.0
VEE – 0.5, VCC + 0.5
VCC – 7.0, VCC + 0.5
VCC – 14, VCC + 0.5
VEE – 0.5, VCC + 14
VEE – 1.0, VEE + 21
Junction Temperature
TJ 150 °C
Storage Temperature
Tstg – 65 to + 150 °C
* Devices should not be operated at these limits. The “Recommended Operating Conditions” table
provides for actual device operation.
RECOMMENDED OPERATING CONDITIONS
Characteristic
Supply Voltage
(with respect to VCC)
(with respect to VDG)
(with respect to VCC)
(with respect to VCC)
(with respect to VAG)
(with respect to VEE)
(with respect to VCC and VAG)
Loop Current
PDI Input Voltage
Sink Current
ST1
ST2
Transmit Signal Level at Tip & Ring
Receive Signal Level at VRX
Loop Resistance VEE = – 42 V
VEE = – 24 V
External Transistor Beta
Operating Ambient Temperature (See text for derating)
All limits are not necessarily functional concurrently.
Symbol
VEE
VDD
VAG
VDG
VDD
IL
VPDI
IST1L
IST2L
STX
SRX
RL
Hfe
TA
Min
– 42
+ 4.5
– 3.0
– 3.0
– 3.0
3.5
15
0
0
0
– 48
– 48
0
0
40
– 40
Typ
– 24
+ 5.0
0
0
0
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
POWER SUPPLIES
VEE Current
On Hook (RL > 10 M, VEE = – 42 V)
Off Hook (RL = 0 , VEE = – 42 V)*
VDD Current
On Hook (RL > 10 M, VDD = + 5.5 V)
Off Hook (RL = 0 , VDD = + 5.5 V)
VEE Ripple Rejection
f = 1.0 kHz, @ VTX (4–wire)
f = 1.0 kHz, @ Tip/Ring (2–wire)
VDD Ripple Rejection
f = 1.0 kHz, @ VTX (4–wire)
f = 1.0 kHz, @ Tip/Ring (2–wire)
IEEN
IEEF
IDDN
IDDF
PSRR
– 2.7
– 72
4.0
40
40
37
37
– 1.0
– 55
1.4
7.0
62
52
52
48
* Includes loop current.
MC33121
2
Max
– 21.6
+ 5.5
+ 10
+ 7.0
+ 10
47.5
50
VDD
1.0
1.0
+ 3.0
+ 3.0
2.0 k
800
500
+ 85
Unit
Vdc
mA
Vdc
mA
dBm
A/A
°C
Max Unit
mA
– 41
2.7
14
dB
MOTOROLA


Part Number MC33121
Description LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT
Maker Motorola
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MC33121 Datasheet PDF






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