L9215A/G
Short-Loop Sine Wave Ringing SLIC
Data Sheet
September 2001
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Features
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Adjustable current limit:
— 10 mA to 70 mA programming range
Overhead voltage:
— Clamped typically <51 V differentially
— Clamped maximum <56.5 V single-ended
— Adjustable in active mode
Thermal shutdown protection with hysteresis
Longitudinal balance:
— ETSI/ITU-T balance
—
Telcordia Technologies
GR-909 balance
Meter pulse compatible:
— Dedicated meter pulse signal input
— On-hook transmission of PPM
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
32-pin PLCC package/48-pin MLCC package
90 V CBIC-S technology
Onboard balanced ringing generation:
— 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
Logic-controlled battery switch:
— Minimize off-hook power dissipation
Minimal external components required
11 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
— PPM active forward active, V
BAT2
applied
— PPM active polarity reversal active, V
BAT2
applied
— PPM active on-hook transmission, V
BAT1
applied
— PPM active on-hook transmission polarity rever-
sal, V
BAT1
applied
— Scan
— Forward disconnect
— Ring mode
Unlatched parallel data control interface
Ultralow SLIC power:
— Scan 38 mW (V
CC
= 5 V)
— Forward/reverse active 57 mW (V
CC
= 5 V)
— Scan 27 mW (V
CC
= 3.3 V)
— Forward/reverse active 42 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
— Common-mode current for ground key applica-
tions, user-adjustable threshold
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Description
The L9215 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.
The L9215 offers 11 operating states. The device
assumes use of a lower-voltage talk battery, a higher-
voltage ringing battery, and a V
CC
supply.
The L9215 requires only a positive V
CC
supply. No
–5 V supply is needed. The L9215 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 –75 V. V
BAT1
is used for power
ring signal amplification and for scan and on-hook
transmission modes. This supply is current limited
to approximately the maximum power ringing cur-
rent, 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.
AGERE [ AGERE SYSTEMS ]
