Le9520
General Purpose Ringing SLIC
Product is discontinued and not allowed for new designs.
Use LE9540 instead.
Overview
The Le9520 Dual Ringing SLIC device is a dual-channel device optimized to provide battery feed, ringing, and supervision on voice loops found in short-loop VoIP applications. This device is optimized to interface to the Broadcom BCM3367/3368 device, or a similar codec.
The Le9520 device operates independently from a single, user-adjusted battery and a +3.3 V VCC per channel. Each channel provides forward and reverse battery feed, voice transmission, power ringing, an ultra low-power scan state, ground start (Tip open), and a disconnect state. A test load switch is also included to support integrated test algorithms. |
Features & Benefits
- Dual Architecture
- Two fully independent integrated SLIC channels
- Differential or Single-Ended Ringing and Codec Interface
- Ringing
- 15 to 70 Hz ring frequency input supported
- Ringing Inputs
- Sinusoidal wave input - sinusoidal wave output
- PWM input - sinusoidal wave output
- Square wave input - trapezoidal output
- Flexible Power Supply Options:
- Single user adjusted battery input per channel
- No lower voltage auxiliary battery
- 3.3 V for VCC
- No -5 V required
- No +5 V required
- High Voltage Design
- Two Grades
- Up to -145 V ringing battery Le9520D
- Up to -100 V ringing battery Le9520C
- Two Grades
- Six Operating States
- Scan state for minimal power dissipation
- PT / PR clamped to > -56.5 V
- Active Forward Battery
- On-Hook or Off-Hook transmission mode
- PT / PR clamped to > -56.5 V
- Active Reverse Battery
- On-Hook or Off-Hook transmission mode
- PT / PR clamped to > -56.5 V
- Ground Start
- Tip Open
- Ring Ground Detection
- Ringing
- Disconnect
- Default Power Up Mode
- Scan state for minimal power dissipation
- Ultra-Low On-Hook Power
- Loop Start, Ring Trip, and Ground Start Detections
- Software-Controllable Current Limit Option
- 25-mA or 40-mA via ground or open control input
- Intermediate current limit values possible with a voltage input to VPROG
- Independent channel control
- Thermal Shutdown Protection with Hysteresis
- Test Load Switch
- Supports integrated test algorithms