AD1994

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.