L9216B/H
Preliminary Data Sheet
September 2001
High-Voltage Ringing SLIC with Ground Start
■ Adjustable current limit:
— 25 mA or 40 mA via ground or open to select input
Features
■ Onboard balanced ringing generation:
— –85 V battery operation
— No ring relay
■ Overhead voltage:
— Clamped <51 V differentially
— Clamped <56.5 V single-ended
— 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
■ Thermal shutdown protection with hysteresis
■ Longitudinal balance:
— Telcordia Technologies GR-909 balance
■ ac interface:
■ Power supplies requirements:
— VCC talk battery and ringing battery required
— No –5 V supply required
— 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
— No high-voltage positive supply required
■ Flexible Vcc options:
— 5 V or 3.3 V VCC operation
— 5 V or 3.3 V VCC interchangeable and transparent
to users
■ 28-pin PLCC package
■ 90 V CBIC-S technology
■ Battery switch via logic control:
— Minimize off-hook power dissipation
Description
■ Minimal external components required
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.
■ Eight operating states:
— Forward active, VBAT2 applied
— Polarity reversal active, VBAT2 applied
— On-hook transmission, VBAT1 applied
— On-hook transmission polarity reversal, VBAT1
applied
— Ground start
— Scan
— Forward disconnect
— Ring mode
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.
■ Unlatched parallel data control interface
The L9216 offers eight operating states. The device
assumes uses of a lower-voltage talk battery, a higher-
voltage ringing battery, and a VCC supply.
■ Ultralow SLIC power at highest –85 V battery:
— Scan 42 mW (VCC = 5 V)
— Forward/reverse active 54 mW (VCC = 5 V)
— Scan 30 mW (VCC = 3.3 V)
— Forward/reverse active 41 mW (VCC = 3.3 V)
The L9216 requires only a positive VCC supply. No
–5 V supply is needed. The L9216 can operate with a
VCC of either 5 V or 3.3 V, allowing for greater user flex-
ibility. The choice of VCC voltage is transparent to the
user; the device will function with either supply voltage
connected.
■ 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
Two batteries are used:
1. A high-voltage ring battery (VBAT1).
VBAT1 is a maximum –85 V. VBAT1 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 (VBAT2).
VBAT2 is used for active mode powering.
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Agere Systems Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
