Am79467
Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
Programmable constant-current feed
Programmable loop-current detector
Programmable ground-key detector
Low standby power
BLOCK DIAGRAM
Ring Relay
Driver
RINGOUT
A(TIP)
Input Decoder
and Control
Ground-Key
Detector
HPA
Two-Wire
Interface
HPB
Signal
Transmission
Off-Hook
Detector
B(RING)
DA
DB
VBAT
BGND
Power-Feed
Controller
Ring-Trip
Detector
Optimized for long-loop operation
On-hook transmission
–24 V to –58 V battery operation
On-chip relay driver
Two-wire impedance set by single external
impedance
C1
C2
E0
E1
DET
VTX
RSN
RD
RDC
CAS
VCC
VEE
AGND/DGND
Publication#
080144
Rev:
D
Amendment: /0
Issue Date:
October 1999
ORDERING INFORMATION
Standard Products
Legerity standard products are available in several packages and operating ranges. The order number (Valid Combination) is
formed by a combination of the elements below.
Am79467
–
1
J
C
OPERATING CONDITIONS
C = Commercial (0°C to 70°C)*
PACKAGE TYPE
J = 28-Pin Plastic Leaded Chip Carrier (PL 028)
PERFORMANCE GRADE
–
1 = 52 dB Long. Balance
–
2 = 63 dB Long. Balance
DEVICE NUMBER/DESCRIPTION
Am79467
Subscriber Line Interface Circuit
Valid Combinations
Am79467
Valid Combinations
JC
Valid Combinations list configurations planned to be
supported in volume for this device. Consult the
local Legerity sales office to confirm availability of
specific valid combinations, to check on newly
released combinations, and to obtain additional
data on Leger ity ’s standard militar y–grade
products.
–
1
–
2
Note:
* Functionality of the device from 0°C to +70°C is guaranteed by production testing. Performance from
–
40°C to +85°C is
guaranteed by characterization and periodic sampling of production units.
2
Am79467 Data Sheet
CONNECTION DIAGRAMS
Top View
28-Pin PLCC
B(RING)
BGND
A(TIP)
27
VCC
NC
NC
4
RINGOUT
VBAT
CAS
E1
E0
NC
DET
5
6
7
8
9
10
11
12
C2
3
2
1
28
26
25
24
23
22
21
20
19
DB
NC
DA
RD
HPA
HPB
VTX
13
C1
14
RDC
15
AGND
16
RSN
17
NC
18
VEE
Notes:
1. Pin 1 is marked for orientation.
2. NC = No connect
SLIC Products
NC
3
PIN DESCRIPTIONS
Pin Names
AGND/DGND
A(TIP)
BGND
B(RING)
C2–C1
CAS
DA
DB
DET
Type
Ground
Output
Ground
Output
Input
Capacitor
Input
Input
Output
Analog and digital ground.
Output of A(TIP) power amplifier.
Battery (power) ground.
Output of B(RING) power amplifier.
Decoder. SLIC control pins. C2 is MSB and C1 is LSB. TTL compatible.
Anti-saturation capacitor pin for capacitor to filter reference voltage when operating in
anti-saturation region.
Ring-Trip negative. Negative input to ring-trip comparator.
Ring-Trip positive. Positive input to ring-trip comparator.
Switchhook detector. When enabled, a logic Low indicates that selected condition is
detected. The detect condition is selected by the logic inputs (C2–C1 and E0–E1). The
output is open-collector with a built-in 15 kΩ pull-up resistor.
DET enable. A logic High disables DET. A logic Low enables DET.
Ground-key enable. A logic High connects the off-hook/ring-trip detector to DET, and a
logic Low connects the ground-key/ring-trip detector to DET.
High-pass filter capacitor. A(TIP) side of high-pass filter capacitor.
High-pass filter capacitor. B(RING) side of high-pass filter capacitor.
No connect. This pin not internally connected.
Detect resistor. Detector threshold set and filter pin.
DC feed resistor. Connection point for the DC feed current programming network. The
other end of the network connects to the receiver summing node (RSN). V
RDC
is negative
for normal polarity and positive for reverse polarity.
Ring relay driver. Open-collector driver with emitter internally connected to BGND.
Receiver summing node. The metallic current (AC and DC) between A(TIP) and B(RING)
is equal to 1000 times the current into this pin. The networks that program receive gain,
two-wire impedance, and feed resistance all connect to this node.
Battery supply.
+5 V power supply.
–5 V power supply.
Transmit audio. This output is a unity gain version of the A(TIP) and B(RING) metallic
voltage. VTX also sources the two-wire input impedance programming network.
Description
E0
E1
HPA
HPB
NC
RD
RDC
Input
Input
Capacitor
Capacitor
—
Resistor
Resistor
RINGOUT
RSN
Output
Input
VBAT
VCC
VEE
VTX
Battery
Power
Power
Output
4
Am79467 Data Sheet
ABSOLUTE MAXIMUM RATINGS
Storage temperature . . . . . . . . . . . . –60
°
C to +150
°
C
V
CC
with respect to AGND/DGND . . . . . 0.5 V to +7 V
V
EE
with respect to AGND/DGND . . . . . 0.5 V to –7 V
V
BAT
with respect to AGND/DGND . . . 0.5 V to –70 V
BGND with respect to AGND/DGND . . . +3 V to –3 V
A(TIP) or B(RING) to BGND:
Continuous . . . . . . . . . . . . . . . . . . . V
BAT
to +2 V
10 ms (f = 0.1 Hz) . . . . . . . . . V
BAT
– 20 V to +5 V
1
µ
s (f = 0.1 Hz). . . . . . . . . . V
BAT
– 40 V to +10 V
250 ns (f = 0.1 Hz) . . . . . . . .V
BAT
– 70 V to +15 V
Current from A(TIP) or B(RING). . . . . . . . . . . . 70 mA
Current through relay driver . . . . . . . . . . . . . . . 50 mA
Ring relay supply voltage . . . . . . . . 0 V to V
BAT
+ 75 V
DA and DB inputs:
Voltage on ring-trip inputs . . . . . . . . . .V
BAT
to 0 V
Current into ring-trip inputs . . . . . . . . . . . .
±
5 mA
C2–C1, E0, E1, DET
Input voltage . . . . . . . . . . . . . . . . . . . . 0 V to V
CC
Output voltage (DET not active) . . . . . 0 V to V
CC
Output current (DET) . . . . . . . . . . . . . . . . . . 5 mA
Power Dissipation (T
A
≤
70
°
C):
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 W
Peak (t < 100 ms, t
REP
> 1 s). . . . . . . . . . . . . 4 W
Note:
Thermal limiting circuitry on chip will shut down the
circuit at a junction temperature of about 165°C. The device
should never be exposed to this temperature. Operation
above 145°C junction temperature may degrade device
reliability. See the SLIC Packaging Considerations for more
information.
Stresses above those listed under Absolute Maximum
Ratings may cause permanent device failure. Functionality
at or above these limits is not implied. Exposure to Absolute
Maximum Ratings for extended periods may affect device
reliability.
OPERATING RANGES
Commercial (C) Devices
Ambient temperature . . . . . . . . . . . . . . 0
°
C to +70
°
C*
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . 4.75 V to 5.25 V
V
EE
. . . . . . . . . . . . . . . . . . . . . . . . –4.75 V to –5.25 V
V
BAT
. . . . . . . . . . . . . . . . . . . . . . . . . . –24 V to –58 V
AGND/DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V
BGND with respect to
AGND/DGND . . . . . . . . . . . –100 mV to +100 mV
Operating Ranges define those limits between which device
functionality is guaranteed.
* Functionality of the device from 0°C to +70°C is guaranteed
by production testing. Performance from
–
40°C to +85°C is
guaranteed by characterization and periodic sampling of
production units.
SLIC Products
5
Power technology
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