Am79R101
Ringing Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
s
Ideal for short-loop applications
— ISDN terminal adaptor, fixed radio access, PBX
and cable telephony
s
Through sinusoidal ringing with DC offset
s
On-chip ring-trip detector
s
Low standby state power
s
Battery operation:
— V
BAT1
: –15 V to –99 V
— V
BAT2
: –15 V to V
BAT1
s
On-chip battery switching and feed selection
s
On-hook transmission
s
Two-wire impedance set by single external
impedance
s
Programmable constant-current feed
s
Programmable Open Circuit voltage
s
Programmable loop-detect threshold
s
Current gain = 1000
s
Ground-key detector
s
Tip Open state for ground-start lines
s
Polarity reversal option available
s
Internal V
EE
regulator (no external –5 V power
supply required)
s
Two on-chip relay drivers and snubber circuits
s
Meets UL1950 safety requirements
BLOCK DIAGRAM
Relay
Driver
RTRIP1
RTRIP2
Relay
Driver
RYOUT2
RYE
RYOUT1
D1
D2
C1
C2
C3
E1
DET
RD
VTX
RSN
RREF
VRING
RDC
RDCR
VSU
RSGL
RSGH
A(TIP)
Ring-Trip
Detector
HPA
Two-Wire
Interface
HPB
Signal
Transmission
B(RING)
Power-Feed
Controller
Ground-Key
Detector
Off-Hook
Detector
Input Decoder
and Control
VBAT2
Switch
Driver
VBAT1
VCC VNEG BGND AGND/DGND
Publication#
23116
Rev:
A
Amendment:
/0
Issue Date:
October 1999
GENERAL DESCRIPTION
The AMD family of subscriber line interface circuit
(SLIC) products provide the telephone interface func-
tions required throughout the worldwide market. AMD
SLIC devices address all major telephony markets in-
cluding central office (CO), private branch exchange
(PBX), digital loop carrier (DLC), fiber-in-the-loop
(FITL), radio-in-the-loop (RITL), hybrid fiber coax
(HFC), and cable telephony applications.
The AMD SLIC devices offer support of BORSHT (bat-
tery feed, overvoltage protection, ringing, supervision,
hybrid, and test) functions with features including cur-
rent limiting, on-hook transmission, polarity reversal, Tip
Open, and loop-current detection. These features allow
reduction of linecard cost by minimizing component
count, conserving board space, and supporting auto-
mated manufacturing.
The AMD SLIC devices provide the two- to four-wire hy-
brid function, DC-loop feed, and two-wire supervision.
Two-wire termination is programmed by a scaled imped-
ance network. Transhybrid balance can be achieved with
an external balance circuit or simply programmed using
a companion AMD codec device, the Am79C02/03/031
DSLAC™ device, the Am79Q02/021/03 Programmable
Quad SLAC (QSLAC™) device, or the Am79Q5457/4457
Nonprogrammable QSLAC device.
The Am79R101 Ringing SLIC device is a bipolar mono-
lithic SLIC that offers on-chip sinusoidal ringing. Now
designers can achieve significant cost reductions at the
system level for reduced-loop applications by integrat-
ing the ringing function on chip. Examples of such ap-
plications would be ISDN terminal adaptors, fiber-in-
the-loop, radio-in-the-loop, hybrid fiber/coax and cable
telephony (home-side) boxes. The Am79R101 Ringing
SLIC can provide sufficient voltage to meet the stringent
LSSGR five-ringer equivalent specification. Using an
appropriate input signal, the Am79R101 provides a si-
nusoidal ringing waveform with DC offset.
In order to further enhance the suitability of this device
in short-loop, distributed switching applications, AMD
has maximized power savings by incorporating battery
switching on chip. The Am79R101 Ringing SLIC device
switches between two battery supplies such that in the
off-hook (active) state, a low battery is used to save
power. In order to meet the Open Circuit voltage require-
ments of fax machines and maintenance termination
units (MTU), the SLIC automatically switches to a higher
voltage in the on-hook (standby) state.
Like all of the AMD SLIC devices, the Am79R101 Ring-
ing SLIC device supports on-hook transmission, ring-
trip detection, programmable loop-detect threshold, and
is available with on-chip polarity reversal. The
Am79R101 Ringing SLIC device is a programmable
constant-current feed device with two on-chip relay driv-
ers to operate external relays. Several performance
grades are available to meet both CCITT and LSSGR
requirements, including various longitudinal balance
options. This unique device is available in a 100 V bi-
polar process in a 32-pin PLCC package.
2
Am79R101 Data Sheet
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.
Am79R101
–1
J
C
TEMPERATURE RANGE
C = Commercial (0°C to 70°C)*
PACKAGE TYPE
J = 32-pin Plastic Leaded Chip Carrier (PL 032)
PERFORMANCE GRADE OPTION
–1 = 52 dB Longitudinal Balance, Polarity Reversal
–2 = 63 dB Longitudinal Balance, Polarity Reversal
–3 = 52 dB Longitudinal Balance, No Polarity Reversal
–4 = 63 dB Longitudinal Balance, No Polarity Reversal
DEVICE NUMBER/DESCRIPTION
Am79R101
Ringing Subscriber Line Interface Circuit
Valid Combinations
–1
–2
–3
–4
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.
Am79R101
JC
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.
SLIC Products
3
CONNECTION DIAGRAM
Top View
32-Pin PLCC
RYOUT2
B(RING)
VBAT2
BGND
A(TIP)
VCC
4
RYE
RYOUT1
VSU
VBAT1
D1
E1
C3
C2
DET
5
6
7
8
9
10
11
12
13
14
C1
3
2
1
32
31 30
29
RTRIP1
RTRIP2
HPB
HPA
VRING
RDCR
VTX
VNEG
RSN
RD
28
27
26
25
24
23
22
21
AGND/DGND
BJ
SU
CT
E
TO
E
G
AN
CH
15 16 17
RSGH
RREF
D2
18 19 20
RSGL
RDC
Note:
Pin 1 is marked for orientation.
4
Am79R101 Data Sheet
PIN DESCRIPTIONS
Pin Names
AGND/DGND
A(TIP)
BGND
B(RING)
C3–C1
D1
D2
DET
Type
Gnd
Output
Gnd
Output
Input
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. C3 is MSB and C1 is LSB. TTL compatible.
Relay1 Control. TTL compatible. Logic Low activates the Relay1 relay driver.
Relay2 Control. (Option) TTL compatible. Logic Low activates the Relay2 relay driver.
Switchhook Detector. When enabled, a logic Low indicates that a selected condition is de-
tected. The detect condition is selected by the logic inputs (C3–C1 and E1). The output is
open collector with a built-in 15 kΩ pull-up resistor.
Ground-Key Enable. (Option) A logic High selects the off-hook detector. A logic Low selects
the ground-key detector. TTL compatible.
High-Pass Filter. A(TIP) side of high-pass filter capacitor.
High-Pass Filter. B(RING) side of high-pass filter capacitor.
Detect Resistor. Detector threshold set and filter pin.
DC Feed Resistor. Connection point for the DC-feed current programming network. The oth-
er end of the network connects to the receiver summing node (RSN). The sign of VRDC is
negative for normal polarity and positive for reverse polarity.
Connection point for feedback during ringing.
Ringing Reference. Reference voltage for Vring pin.
Saturation Guard High. Pin for resistor to adjust Open Circuit voltage when operating
from V
BAT1
.
Saturation Guard Low. Pin for resistor to adjust the anti-saturation cut-in voltage when oper-
ating from both V
BAT1 and
V
BAT2
.
Receive Summing Node. The metallic current (both AC and DC) between A(TIP) and
B(RING) is equal to 1000 x the current into this pin. The networks that program receive gain,
two-wire impedance, and feed resistance all connect to this node.
Ring-Trip Detector. Ring-trip detector threshold set and filter pin.
Ring-Trip Detector. Ring-trip detector threshold offset (switch to V
BAT1
). For power conser-
vation in any nonringing state, this switch is open.
Common Emitter of RYOUT1/RYOUT2. Emitter output of RYOUT1 and RYOUT2. Normally
connected to relay ground.
Relay/Switch Driver. Open collector driver with emitter internally connected to RYE.
Relay/Switch Driver. (Option) Open collector driver with emitter internally connected to RYE.
Battery supply and connection to substrate.
Power supply to output amplifiers. Connect to off-hook battery through a diode.
Positive analog power supply
Negative analog power supply. This pin is the return for the internal V
EE
regulator.
Ring Signal. Ring signal input with respect R
REF
. 1 V maximum level 10 kΩ input impedance
to R
REF
.
Connects to CDC to speed up state transitions.
Transmit Audio. This output is proportional to the A(TIP) and B(RING) metallic AC voltage.
VTX also sources the two-wire input impedance programming network. (See two- to four-
wire gain accuracy.)
Description
E1
HPA
HPB
RD
RDC
Input
Capacitor
Capacitor
Resistor
Output
RDCR
RREF
RSGH
RSGL
RSN
—
—
Input
Input
Input
RTRIP1
RTRIP2
RYE
RYOUT1
RYOUT2
VBAT1
VBAT2
VCC
VNEG
VRING
VSU
VTX
Input
Input
Output
Output
Output
Battery
Battery
Power
Power
Input
—
Output
SLIC Products
5
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