• 24-pin SSOP package
• Programmable two-wire signal headroom for 2.2 Vrms metering
• High and low battery with automatic switching
• Only +5 V feed in addition to battery
• Selectable transmit gain (0.5x or 0.25x)
• 70 mW on-hook power dissipation in active state
• On-hook transmission
• Long loop .