AD1990_15 Datasheet, PDF (1/16 Pages) Analog Devices – Audio Switching Amplifier

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
PGA1 PGA0
AV_DD
DV_DD
FEEDBACK
NETWORK
PV_DD
AD1990
AINL
PGA
Σ-Δ
MODULATOR
A1
OUTL+
A2
AINR
CLKI
CLKO
REF_FILT
PGA
Σ-Δ
MODULATOR
LEVEL
SHIFTER
AND
DEAD TIME
CONTROL
OSCILLATOR
MODE CONTROL
LOGIC AND
POP/CLICK
SUPPRESSION
VOLTAGE
REFERENCE
B1
B2
H-BRIDGE
C1
C2
D1
D2
OUTL–
OUTR+
OUTR–
AGND
PGND
Figure 1.
FEEDBACK
NETWORK
Rev. 0
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