AD1990: Class-D Audio Power Amplifier – 2 × 5W 0 pages

Audio Switching Amplifier
AD1990
Rev. 0
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FEATURES
Integrated stereo modulator and power stage
<0.002% THD + N
101 dB dynamic range (A-weighted)
2 × 5 W output power (4 Ù, <0.01% THD + N)
RDS-ON < 0.3 Ù (per transistor)
PSRR > 65 dB
On-off-mute pop noise suppression
EMI optimized modulator
Short-circuit protection
Overtemperature protection
Low cost DMOS process
APPLICATIONS
Advanced televisions
Compact multimedia systems
Minicomponents
GENERAL DESCRIPTION
The AD1990 is a 2-channel, bridge tied load (BTL), switching audio power amplifier with integrated Ó-Ä 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.
FUNCTIONAL BLOCK DIAGRAM B2B1A2A1OUTL+LEVELSHIFTERANDDEAD TIMECONTROLH-BRIDGEPGNDOUTL–OUTR+DCTRL2DCTRL1DCTRL0OUTR–D2D1C2C1NFR+NFR–NFL+NFL–MUTERESETERR2ERR1ERR0Ó-ÄMODULATORÓ-ÄMODULATORPGAPGAOSCILLATORVOLTAGEREFERENCEMODE CONTROLLOGIC ANDPOP/CLICKSUPPRESSIONAGNDCLKICLKOREF_FILTAINRAINLPVDDAVDDDVDDPGA1PGA0FEEDBACKNETWORKFEEDBACKNETWORKAD199005380-001
Figure 1.