L9500A Datasheet, PDF (4/32 Pages) Agere Systems – High-Voltage Ringing SLIC for VolP Applications

L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Features
s On board 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
s Power supplies requirements:
— VCC talk battery and ringing battery required
— No –5 V supply required
— No high-voltage positive supply required
s Flexible Vcc options:
— 5 V or 3.3 V VCC operation
— 5 V or 3.3 V VCC interchangeable and transparent
to users
s Battery switch via logic control:
— Minimize off-hook power dissipation
s Minimal external components required
s 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
s Unlatched parallel data control interface
s Ultralow SLIC power:
— Scan 38 mW (VCC = 5 V)
— Forward/reverse active 54 mW (VCC = 5 V)
— Scan 27 mW (VCC = 3.3 V)
— Forward/reverse active 41 mW (VCC = 3.3 V)
s Supervision:
— Loop start, fixed threshold with hysteresis
— Ring trip, single-pole ring trip filtering, fixed thresh-
old as a function of battery voltage
— Ground start fixed threshold with hysteresis
s Adjustable current limit:
— 25 mA or 40 mA via ground or open to control
input
s Overhead voltage:
— Clamped typically <51 V differentially
— Clamped maximum <56.5 V single-ended
s Thermal shutdown protection with hysteresis
s Device interfaces:
— Differential receive interface
— Singled-ended transmit interface
— Differential ring input
s Package options:
— 28-pin PLCC
— 48-pin MLCC
s 90 V CBIC-S technology
Description
The L9500 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 L9500 offers 8 operating states. The device
assumes use of a lower-voltage talk battery, a higher-
voltage ringing battery, and a VCC supply.
The L9500 requires only a positive VCC supply. No
–5 V supply is needed. The L9500 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.
Two batteries are used:
1. A high-voltage ring battery (VBAT1).
VBAT1 is a maximum –75 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.