Am79534/Am79535
Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
s
Programmable constant-current feed
s
Line-feed characteristics independent of
battery variations
s
Programmable loop-detect threshold
s
On-chip switching regulator for low-power
dissipation
s
Pin for external ground-key noise-filter
capacitor available
s
Ground-key detect
s
Two-wire impedance set by single external
impedance
s
Polarity reversal feature
s
Tip Open state for ground-start lines
s
Test relay driver optional
s
On-hook transmission
BLOCK DIAGRAM
Ring Relay Driver
A(TIP)
Test Relay Driver
Ground-Key
Detector
HPA
Two-Wire
Interface
HPB
Signal Transmission
Off-Hook Detector
B(RING)
DA
DB
VREG
L
VBAT
BGND
Power-Feed
Controller
Ring-Trip Detector
RD
RDC
Input Decoder
and Control
RINGOUT
TESTOUT
C1
C2
C3
C4
E1
E0
DET
GKFIL
VTX
RSN
Switching Regulator
CHS
QBAT
CHCLK
VCC
VEE
AGND
16854C-01
Notes:
1. Am79534—E0 and E1 inputs; ring and test relay drivers sourced internally to BGND.
2. Am79535—E0 and E1 inputs; ring relay driver sourced internally to BGND; ground-key filter pin.
3. Current gain (K
1
) = 1000 for all parts.
Publication#
16854
Rev:
D
Amendment: /0
Issue Date:
October 1999
ORDERING INFORMATION
Standard Products
AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed
by a combination of the elements below.
Am7953X
J
C
OPERATING CONDITIONS
C = Commercial (0°C to 70°C)*
PACKAGE TYPE
J = 32-Pin Plastic-Leaded Chip Carrier (PL 032)
PERFORMANCE GRADE
Blank = Standard Specification
–1 = Performance Grading
–2 = Performance Grading
DEVICE NUMBER/DESCRIPTION
Am7953X
Subscriber Line Interface Circuit
Valid Combinations
Am7953X
–1
–2
DC
JC
Valid Combinations
Valid Combinations list configurations planned to be supported
in volume for this device. Consult the local AMD sales office to
confirm availability of specific valid combinations, to check on
newly released combinations, and to obtain additional data on
AMD’s standard military grade products.
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
Am7953X Data Sheet
CONNECTION DIAGRAMS
Top View
Am79534
RINGOUT
B(RING)
BGND
A(TIP)
31
VREG
VCC
4
RSVD
TESTOUT
L
VBAT
QBAT
CHS
CHCLK
C4
E1
5
6
7
8
9
10
11
12
13
14
E0
3
2
1
32
30
29
28
27
26
25
24
23
22
21
RSVD
DA
RD
HPB
HPA
VTX
VEE
RSN
AGND
15
DET
16
C2
17
C3
18
C1
19
RDC
A(TIP)
31
20
DGND
30
29
28
27
26
25
24
23
22
21
TP
DA
RD
HPB
HPA
VTX
VEE
RSN
AGND
20
DGND
DB
Am79535
RINGOUT
B(RING)
BGND
VREG
4
TP
GKFIL
L
VBAT
QBAT
CHS
CHCLK
RSVD
E1
5
6
7
8
9
10
11
12
13
14
Notes:
1. Pin 1 is marked for orientation.
E0
VCC
3
2
1
32
15
DET
16
C2
17
C3
18
C1
19
RDC
2. TP is a thermal conduction pin tied to substrate (QBAT).
3. RSVD = Reserved. Do not connect to these pins.
SLIC Products
DB
3
PIN DESCRIPTIONS
Pin Names
AGND
A(TIP)
BGND
B(RING)
C3–C1
C4
CHCLK
CHS
DA
DB
DET
DGND
E0
E1
Type
Gnd
Output
Gnd
Output
Input
Input
Input
Input
Input
Input
Output
Gnd
Input
Input
Analog (quiet) ground.
Output of A(TIP) power amplifier.
Battery (power) ground.
Output of B(RING) power amplifier.
Decoder. TTL compatible. C3 is MSB and C1 is LSB.
Test relay driver command (Am79534). TTL compatible. A logic Low enables the driver.
Chopper clock. Input to switching regulator (TTL compatible). Frequency = 256 kHz (nominal).
Chopper stabilization. Connection for external stabilization components.
Ring-trip negative. Negative input to ring-trip comparator.
Ring-trip positive. Positive input to ring-trip comparator.
Detector. A logic Low indicates that the selected detector is tripped. The detector is selected by
the logic inputs (C3–C1, E0, and E1). The output is open-collector with a built-in 15 kΩ pull-up
resistor.
Digital ground.
Read enable. A logic High enables DET. A logic Low disables DET.
Ground-key enable. E1 = High connects the ground-key detector to DET, and E1 = Low connects
the off-hook or ring-trip detector to DET.
Ground-key filter capacitor connection ( Am79535). An external capacitor for filtering out
high-frequency noise from the ground-key loop can be connected to this pin. An internal 36 kΩ, –
20%, +40% resistor is provided to form an RC filter with the external capacitor. In versions that
have a GKFIL pin, 3.3 nF minimum capacitance must be connected from the GKFIL pin to ground.
High-pass filter capacitor; A(TIP) side of high-pass filter capacitor.
High-pass filter capacitor; B(RING) side of high-pass filter capacitor.
Switching regulator power transistor. Connection point for filter inductor and anode of catch diode.
This pin has up to 60 V of pulse waveform on it and must be isolated from sensitive circuits. Keep
the diode connections short because of the high currents and high di/dt.
Quiet battery. Filtered battery supply for the signal processing circuits.
Detect resistor. Threshold modification and filter point for the off-hook detector.
DC feed resistor. Connection point for the DC feed-current programming network which also
connects to the Receiver Summing Node (RSN). V
RDC
is negative for normal polarity and
positive for reverse polarity.
Ring relay driver; sourcing from BGND with internal diode to QBAT.
Receive 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 current all connect to this node. This node is extremely sensitive. Route the
256 kHz chopper clock and switch lines away from the RSN node.
Test relay driver (Am79534); sourcing from BGND with internal diode to QBAT.
Thermal pin. Connection for heat dissipation. Internally connected to substrate (QBAT). Leave as
open circuit or connected to QBAT. In both cases, the TP pins can connect to an area of copper
on the board to enhance heat dissipation.
Battery supply through an external protection diode.
+5 V power supply.
–5 V power supply.
Regulated voltage. Provides negative power supply for power amplifiers and connection point for
inductor, filter capacitor, and chopper stabilization.
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 connects here.
Description
GKFIL
Capacitor
HPA
HPB
L
QBAT
RD
RDC
RINGOUT
Capacitor
Capacitor
Output
Battery
Resistor
Resistor
Output
RSN
Input
TESTOUT
TP
VBAT
VCC
VEE
VREG
VTX
Output
Thermal
Battery
Power
Input
Input
Output
4
Am7953X Data Sheet
ABSOLUTE MAXIMUM RATINGS
Storage temperature . . . . . . . . . . . . –55
°
C to +150
°
C
V
CC
with respect to AGND/DGND . . .–0.4 V to +7.0 V
V
EE
with respect to AGND/DGND . . .+0.4 V to –7.0 V
V
BAT
with respect to AGND/DGND . . +0.4 V to –70 V
Note:
Rise time of V
BAT
(dv/dt) must be limited to 27 V/µs or
less when Q
BAT
bypass = 0.33
µF.
In 32-pin PLCC package . . . . . . . . . . . . . 1.74 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.
BGND with respect to
AGND/DGND. . . . . . . . . . . . . . . .+1.0 V to –3.0 V
A(TIP) or B(RING) to BGND:
Continuous . . . . . . . . . . . . . . . . . –70 V to +1.0 V
10 ms (f = 0.1 Hz) . . . . . . . . . . . . –70 V to +5.0 V
1
µ
s (f = 0.1 Hz). . . . . . . . . . . . . . .–90 V to +10 V
250 ns (f = 0.1 Hz) . . . . . . . . . . . .–120 V to +15 V
Current from A(TIP) or B(RING). . . . . . . . . .
±
150 mA
Voltage on RINGOUT . . . BGND to 70 V above Q
BAT
Voltage on TESTOUT . . . BGND to 70 V above Q
BAT
Current through relay drivers . . . . . . . . . . . . . . 60 mA
Voltage on ring-trip inputs (DA and DB) . . .V
BAT
to 0 V
Current into ring-trip inputs . . . . . . . . . . . . . .
±
10 mA
Peak current into regulator switch (L pin) . . . 150 mA
Switcher transient peak off voltage on L pin . . +1.0 V
C4–C1, E1, CHCLK to
AGND/DGND. . . . . . . . . . –0.4 V to (V
CC
+ 0.4 V)
Maximum power dissipation (see note) . . . T
A
= 70
°
C
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
. . . . . . . . . . . . . . . . . . . . . . . . . . –40 V to –58 V
AGND/DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V
BGND with respect to
AGND/DGND . . . . . . . . . . . –100 mV to +100 mV
Load resistance on VTX to ground . . . . . . . 10 k
Ω
min
Operating Ranges define those limits between which the
functionality of the device 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
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