AD1994_15 Datasheet, PDF (1/24 Pages) Analog Devices – Audio Switching Amplifier

Audio Switching Amplifier
AD1994
FEATURES
GENERAL DESCRIPTION
Integrated stereo modulator and power stage
The AD1994 is a 2-channel, bridge tied load (BTL), switching
<0.005% THD + N
audio power amplifier with integrated Σ-Δ modulator. The
105 dB dynamic range (A-weighted)
modulator accepts a single-ended, analog input signal and
2 × 25 W output power (6 Ω, 10% THD + N)
converts it to a switching waveform to drive speakers directly.
1 × 50 W output power (3 Ω, 10% THD + N)
One of the two modulators can control both output stages
RDS-ON < 0.3 Ω (per transistor)
PSRR > 65 dB
On-off-mute pop noise suppression
EMI optimized modulator
Short-circuit protection
E Overtemperature protection
Low cost DMOS process
T ^APPLICATIONS
Advanced televisions
Compact multimedia systems
E ^{Minicomponents}
providing twice the current and almost twice the efficiency for
single-channel applications. Both modulators can also control
external power devices for arbitrarily high output power. 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 20 V. The analog
modulator and digital logic operate from a 5 V supply.
FUNCTIONAL BLOCK DIAGRAM
L _{PGA1 PGA0}
AV_DD
DV_DD
FEEDBACK
NETWORK
PV_DD
AD1994
O ^AINL
PGA
Σ-Δ
MODULATOR
A1
OUTL+
A2
S _{MOD_FILT}
B AINR
CLKI
O^CLKO
PGA
ORDER
REDUCER
Σ-Δ
MODULATOR
LEVEL
SHIFTER
AND
DEAD TIME
CONTROL
OSCILLATOR
MODE CONTROL
LOGIC AND
POP/CLICK
B1
B2
H-BRIDGE
C1
C2
OUTL–
OUTR+
SUPPRESSION
REF_FILT
VOLTAGE
REFERENCE
D1
D2
OUTR–
AGND
Figure 1.
PGND
FEEDBACK
NETWORK
Rev. 0
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