1993_Motorola_Linear_Interface_ICs_Vol_2.pdf

Tone Ringers
The MC34012, MC34017, and MC34117 Tone Ringers are
designed to replace the bulky bell assembly of a telephone,
while providing the same function and performance under a
variety of conditions. The operational requirements spelled
out by the FCC and EIA-470, simply stated, are that a ringer
MC34012P, D
TA = -20° to +60°C, Case 626, 751
• Complete Telephone Bell Replacement
• On-Chip Diode Bridge and Transient Protection
• Single-Ended Output to Piezo Transducer
• Input Impedance Signature Meets Bell and EIA Standards
• Rejects Rotary Dial and Hook Switch Transients
• Adjustable Base Frequencies
• Output Frequency to Warble Ratio - MC34012-1 :80
MC34012-2:160
MC34012-3:40
MC34017P, D
TA = -20° to +60°C, Case 626, 751
• Complete Telephone Bell Replacement
• On-Chip Diode Bridge and Transient Protection
• Differential Output to Piezo Transducer for Louder Sound
• Input Impedance Signature Meets Bell and EIA Standards
• Rejects Rotary Dial and Hook Switch Transients
• Output Frequency to Warble Ratio - MC34017-1 :80
MC34017-2:160
MC34017-3:40
MC34217P, D
TA = -20° to +60°C, Case 626, 751
• Complete Telephone Bell Replacement
• On-Chip Diode Bridge
• Internal Transient Protection TIp
• Differential Output to Piezo Transducer ior Louder Sound
• Input Impedance Signature Meets Bell and EIA Standards R;"9
• Rejects Rotary Dial and Hook Switch Transients
• Base Frequency and Warble Frequencies are
Independently Adjustable
• Adjustable Base Frequency
• Reduced Number of Externals
MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA
8-18
Ring
C2
circuit MUST function when a ringing signal is provided, and
MUST NOT ring when other signals (speech, dialing, noise)
are on the line. The tone ringers described below were
designed to meet those requirements with a minimum of
external components.
C3