A series of miniature AES/EBU-compliant digital audio transformers from MPS Industries feature a 1:1 turns ratio and Faraday shielding. According to the company, the transformers' shielding and special construction/design improves CMRR by almost 30 dB while maintaining data quality, low jitter rate, and >100-MHz bandwidth.
The units work with sample rates from 32 kHz to 192 kHz for both 75- and 110-Ω connections. The transformers are available in both thru-hole and surface-mount versions, and are RoHS compliant. Custom designs are available.
MPS Industries, 310-324-1043, www.mpsind.com
Digital audio transformer datasheet (PDF)