Class-D Audio Power Amplifier – 2 × 25W

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Replacement Parts

Rochester Electronics is the only authorized source of Analog Devices' products that have previously been discontinued or have become obsolete. Product availability should be checked directly with Rochester Electronics.

Product Details

The AD1994 class-D amplifier integrates a stereo ∑∆ modulator and stereo “bridge-tied" load (BTL) power stage onto a single die capable of delivering 50W of continuous power without a heat sink. The new ∑∆ modulator architecture uses a patented dynamic hysteresis algorithm to achieve audiophile performance (THD < 0.005 %, SNR > 105 dB) without compromising efficiency. The closed-loop architecture and continuous-time modulator front-end achieve a PSRR > 65 dB, and the stereo BTL power stage requires only a single supply that can operate over a wide voltage range. The ∑∆ modulator in the AD1994. designed to minimize radiated and conducted EMI and RF emissions, can optionally be used to drive external power devices to achieve arbitrarily high output power.


  • Advanced televisions
  • Compact multimedia systems
  • Minicomponents
  • Active loudspeakers