High-Precision Digital-to-Analog Conversion

The Evertz 7720DAC-A4 and 7720DAC-A4-B are broadcast-grade, 24-bit Digital-to-Analog Audio Converters designed to split and decode two digital AES/EBU streams into four channels of balanced analog audio. Supporting standard broadcast sampling frequencies of $44.1\text{ kHz}$ and $48\text{ kHz}$, these modules utilize advanced VCXO-based clock recovery to minimize jitter and guarantee transparent, low-distortion conversion. The series provides ultra-clean signal processing with a signal-to-noise ratio exceeding $110\text{ dB}$ and total harmonic distortion (THD+N) below $-100\text{ dB}$.

Unbalanced vs. Balanced Input Flexibility

To seamlessly integrate into different facility cabling infrastructures, the module is available in two distinct hardware configurations:

• 7720DAC-A4 (Unbalanced BNC): Features two 75$\ \Omega$ BNC inputs compliant with SMPTE ST 276M / AES3id / S/PDIF standards. It supports equalization for long coaxial cable runs over 1,000 meters.
• 7720DAC-A4-B (Balanced Terminal Block): Equipped with 3-pin removable terminal strip connectors for 110$\ \Omega$ transformer-coupled balanced AES3 signals, supporting shielded twisted-pair cable runs up to 400 meters.

Both configurations incorporate AC-coupled grounding on the inputs to prevent 60Hz ground loops and hum interference.

On-Card Level Configuration and Remote SNMP Control

Engineered for efficient field maintenance and calibration, the 7720DAC-A4 series features a card-edge toggle switch and digital LED display. Operators can individually calibrate each output's peak operating level ($0\text{ dBFS}$) between $+12\text{ dBu}$ and $+25\text{ dBu}$ in precise $0.1\text{ dB}$ increments. A built-in 4-channel LED bargraph meter provides immediate visual audio level checks without requiring external monitoring equipment. When installed in Evertz 7700FR or 7800FR enclosures equipped with a 7800FC Frame Controller card, the modules integrate fully into VistaLINK® SNMP management systems and Evertz hardware control panels (such as the VUE-CP232 and VUE-TOUCH2-12R).