AD1990

Audio Switching Amplifier AD1990 FEATURES Integrated stereo modulator and power stage <0.002% THD + N 101 dB dynamic range (A-weighted) 2 × 5 W output power (4 Ω, <0.01% THD + N) RDS-ON < 0.3 Ω (per transistor) PSRR > 65 dB On-off-mute pop noise suppression EMI optimized modulator Short-circuit protection Overtemperature protection Low cost DMOS process GENERAL DESCRIPTION The AD1990 is a 2-channel, bridge tied load (BTL), switching audio power amplifier with integrated Σ-Δ modulator. The modulator accepts a single-ended, analog input signal and converts it to a switching waveform to drive speakers directly. A digital, microprocessor-compatible interface provides control of reset, mute, and PGA gain, as well as feedback signals for thermal and overcurrent error conditions. The output stage can operate over a power supply voltages range of 8 V to 12 V. The analog modulator and digital logic operate from a 5 V supply. APPLICATIONS Advanced televisions Compact multimedia systems Minicomponents FUNCTIONAL BLOCK DIAGRAM FEEDBACK NETWORK PGA1 PGA0 AVDD NFL+ www.DataSheet4U.com NFL– DVDD PVDD AD1990 AINL PGA Σ-Δ MODULATOR A1 A2 OUTL+ B1 LEVEL SHIFTER AND DEAD TIME CONTROL AINR PGA Σ-Δ MODULATOR B2 H-BRIDGE C1 C2 CLKI CLKO OSCILLATOR MODE CONTROL LOGIC AND POP/CLICK SUPPRESSION D1 REF_FILT VOLTAGE REFERENCE D2 OUTR– OUTL– OUTR+ MUTE RESET NFR– DCTRL2 DCTRL1 DCTRL0 ERR2 ERR1 ERR0 NFR+ AGND PGND FEEDBACK NETWORK 05380-001 Figure 1. Rev. 0 Information furnished b...