CMX683D4

Telecom Overview

The CMX683D4 is a Call Progress and Voice Detector manufactured by CML Microcircuits. It operates within a supply voltage range of 2.7V to 5.5V, consuming 1µA in standby mode and typically 0.6mA at 3.0V during active operation. The device detects single and dual call progress tones within the 315Hz to 650Hz band and identifies non-call progress signals such as voice or music via VOICE FAST and VOICE SLOW outputs. It utilizes a 3.58MHz crystal oscillator for accurate timing and features a SOIC-16 package with an operating temperature range of -40°C to +85°C.

Telecom Feature Summary

• Detects worldwide call progress tone compatibility including dial tone, ringing, busy, and not available states
• Outputs fast and slow voice detection signals for billing and payphone applications
• Uses stochastic signal processing to distinguish valid call progress tones from DTMF, noise, and speech
• Integrates a 3.58MHz crystal oscillator for precise frequency analysis

Telecom Applications

• Worldwide payphone systems
• Telephone redialling systems
• Banking and billing systems
• Telecom test equipment
• Telecom security systems

Telecom Procurement Notes

Verify the specific suffix 'D4' corresponds to the SOIC-16 package variant when sourcing. Confirm that the component meets RoHS compliance requirements if applicable to your manufacturing standards. Ensure the host microcontroller interface logic levels are compatible with the CMOS outputs provided by this detector IC.

Telecom Selection Notes

Select the CMX683D4 when a surface-mount SOIC-16 package is required for space-constrained designs. Choose this part over DIP or TSSOP variants based on PCB layout constraints and assembly capabilities. Consider the low power consumption characteristics suitable for battery-operated telecom devices requiring long standby periods.

Telecom Part Context

The CMX683 series includes multiple package options to accommodate different design needs. The CMX683P1 denotes the DIP package version, while the CMX683E4 represents the TSSOP package variant. All versions share identical electrical performance and functional specifications, differing only in physical footprint and pin configuration.

Telecom Replacement Considerations

CMX683E4 (TSSOP Package)

Telecom FAQ

How does the CMX683D4 distinguish between call progress tones and voice activity?

It uses stochastic signal processing techniques that analyze signal frequency, duration, and amplitude. It checks if the signal profile matches international call progress standards or if it resembles speech, music, or noise.

What is the function of the CONFIG pin?

The CONFIG pin determines the clock source. Leaving it unconnected enables the internal 3.58MHz crystal oscillator. Connecting it to VDD enables the external clock input on the CLOCK IN pin.

Can CP DETECT and VOICE outputs be active simultaneously?

Yes, both can be at logic 1 simultaneously. The host microcontroller must use cadence information to determine the actual signal state, as the device may detect call progress characteristics followed by voice activity.