L9216B/H
High-Voltage Ringing SLIC with Ground Start
Preliminary Data Sheet
September 2001
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Features
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Adjustable current limit:
— 25 mA or 40 mA via ground or open to select input
Overhead voltage:
— Clamped <51 V differentially
— Clamped <56.5 V single-ended
Thermal shutdown protection with hysteresis
Longitudinal balance:
—
Telcordia Technologies
GR-909 balance
ac interface:
— Two SLIC gain options to minimize external com-
ponents required for interface to first- or third-gen-
eration codecs
— Sufficient dynamic range for direct coupling to
codec output
28-pin PLCC package
90 V CBIC-S technology
Onboard balanced ringing generation:
— –85 V battery operation
— No ring relay
— No bulk ring generator required
— 15 Hz to 70 Hz ring frequency supported
— Sine wave input-sine wave output
— PWM input-sine wave output
— Square wave input-trapezoidal output
Power supplies requirements:
— V
CC
talk battery and ringing battery required
— No –5 V supply required
— No high-voltage positive supply required
Flexible Vcc options:
— 5 V or 3.3 V V
CC
operation
— 5 V or 3.3 V V
CC
interchangeable and transparent
to users
Battery switch via logic control:
— Minimize off-hook power dissipation
Minimal external components required
Eight operating states:
— Forward active, V
BAT2
applied
— Polarity reversal active, V
BAT2
applied
— On-hook transmission, V
BAT1
applied
— On-hook transmission polarity reversal, V
BAT1
applied
— Ground start
— Scan
— Forward disconnect
— Ring mode
Unlatched parallel data control interface
Ultralow SLIC power at highest –85 V battery:
— Scan 42 mW (V
CC
= 5 V)
— Forward/reverse active 54 mW (V
CC
= 5 V)
— Scan 30 mW (V
CC
= 3.3 V)
— Forward/reverse active 41 mW (V
CC
= 3.3 V)
Supervision:
— Loop start, fixed threshold with hysteresis
— Ring trip, single-pole ring trip filtering, fixed thresh-
old as a function of battery voltage
— Ring current for ground start applications, user-
adjustable threshold
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Description
The L9216 is designed to provide battery feed, ringing,
and supervision functions on short plain old telephone
service (POTS) loops. This device is designed for
ultralow power in all operating states.
Operating battery voltage is up to 85 V. This allows for
a higher rms ringing voltage to extend ringing loop
lengths. It will also increase peak-to-peak ringing volt-
age to improve compatibilty with various CPE. Because
of the higher voltage battery, this device will light neon
lamps that may be found on some types of CPE.
The L9216 offers eight operating states. The device
assumes uses of a lower-voltage talk battery, a higher-
voltage ringing battery, and a V
CC
supply.
The L9216 requires only a positive V
CC
supply. No
–5 V supply is needed. The L9216 can operate with a
V
CC
of either 5 V or 3.3 V, allowing for greater user flex-
ibility. The choice of V
CC
voltage is transparent to the
user; the device will function with either supply voltage
connected.
Two batteries are used:
1. A high-voltage ring battery (V
BAT1
).
V
BAT1
is a maximum –85 V. V
BAT1
is used for power
ring signal amplification and for scan, on-hook
transmission, and ground start modes. This supply
is current limited to approximately the maximum
power ringing current, typically 50 mA.
2. A lower-voltage talk battery (V
BAT2
).
V
BAT2
is used for active mode powering.
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Agere Systems Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
