L9215A/G
Short-Loop Sine Wave Ringing SLIC
Data Sheet
September 2001
■ Adjustable current limit:
— 10 mA to 70 mA programming range
Features
■ Onboard balanced ringing generation:
— No ring relay
■ Overhead voltage:
— Clamped typically <51 V differentially
— Clamped maximum <56.5 V single-ended
— Adjustable in active mode
— 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:
— ETSI/ITU-T balance
— Telcordia Technologies GR-909 balance
■ Power supplies requirements:
— VCC talk battery and ringing battery required
— No –5 V supply required
■ Meter pulse compatible:
— Dedicated meter pulse signal input
— On-hook transmission of PPM
— 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
■ ac interface:
— Two SLIC gain options to minimize external com-
ponents required for interface to first- or third-gen-
eration codecs
■ Logic-controlled battery switch:
— Sufficient dynamic range for direct coupling to
codec output
— Minimize off-hook power dissipation
■ Minimal external components required
■ 32-pin PLCC package/48-pin MLCC package
■ 90 V CBIC-S technology
■ 11 operating states:
— Forward active, VBAT2 applied
— Polarity reversal active, VBAT2 applied
— On-hook transmission, VBAT1 applied
— On-hook transmission polarity reversal, VBAT1
applied
Description
— PPM active forward active, VBAT2 applied
— PPM active polarity reversal active, VBAT2 applied
— PPM active on-hook transmission, VBAT1 applied
— PPM active on-hook transmission polarity rever-
sal, VBAT1 applied
— Scan
— Forward disconnect
— Ring mode
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 VCC supply.
The L9215 requires only a positive VCC supply. No
–5 V supply is needed. The L9215 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.
■ Unlatched parallel data control interface
■ Ultralow SLIC power:
— Scan 38 mW (VCC = 5 V)
— Forward/reverse active 57 mW (VCC = 5 V)
— Scan 27 mW (VCC = 3.3 V)
— Forward/reverse active 42 mW (VCC = 3.3 V)
Two batteries are used:
■ Supervision:
1. A high-voltage ring battery (VBAT1).
— 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
VBAT1 is a maximum –75 V. VBAT1 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 (VBAT2).
VBAT2 is used for active mode powering.
4
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
