ADAU1592ACPZ-RL Analog Devices Inc, ADAU1592ACPZ-RL Datasheet - Page 16

• Manufacturer Part Number: ADAU1592ACPZ-RL
• Description: 18W Int Stereo Switching Audio Power Amp
• Manufacturer: Analog Devices Inc
• Type: Class Dr

Specifications of ADAU1592ACPZ-RL

• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 24W x 2 @ 4 Ohm
• Voltage - Supply: 9 V ~ 18 V
• Features: Depop, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 48-LFCSP
• Operational Class: Class-D
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Output Power (typ): 24x2@4OhmW
• Audio Amplifier Function: Speaker
• Total Harmonic Distortion: 0.005@6Ohm@1W%
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): 3.3/15V
• Power Supply Requirement: Triple
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 65dB
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): 3/9V
• Dual Supply Voltage (max): 3.6/18V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LFCSP EP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADAU1592
The slicer threshold can be set externally using a resistor as
follows:
where:
AVDD = 3.3 V typical.
V
The following equation can be used to calculate the input signal
at which the slicer becomes active:
Therefore, for AVDD = 3.3 V typical and V
Thus, the slicer is activated at and above 0.864 V
This feature allows the user to set the slicer and, in turn, reduces
the output power at a given supply voltage. To disable the slicer,
SLC_TH should be connected directly to AGND. Table 9 shows
the typical values for R
Table 9. Typical R
V
1.1
1.17
1.24
1.32
POWER STAGE
The ADAU1592 power stage comprises a high-side PMOS and
a low-side NMOS. The typical R
NMOS stage does not need an external bootstrap capacitor and
simplifies the high-side driver design. The power stage also has
comprehensive protection circuits to detect the faults in typical
applications. See the Protection Circuits section for further details.
TH
TH
(V)
is the voltage threshold at which the slicer is activated.
R
V
V
V
EXTERNAL
IN rms
TH
IN rms
=
Figure 43. Block for Slicer Threshold Adjust, SLC_TH
= 0.864 V
=
⎛
⎜
⎝
V
CM
AVDD
1.414 ×
= 24.9 kΩ
SLICER_LEVEL
2
V
R
24.9
20.5
16.5
12.4
TH
EXTERNAL
EXTERNAL
⎞
⎟
⎠
0.9
EXTERNAL
×
⎛
⎜
⎜
⎝
(kΩ)
Values
50
50kΩ
k
.
V
R
TH
Ω
EXTERNAL
DS-ON
50
+
R
k
is ~300 mΩ. The PMOS-
EXTERNAL
Ω
PIN 24 (SLC_TH)
TH
V
0.864
0.919
0.974
1.037
= 1.1 V,
IN rms
⎞
⎟
⎟
⎠
IN rms
(V)
.
Rev. A | Page 16 of 24
GAIN
The gain of the amplifier is set internally using feedback
resistors optimized for 15 V nominal operation. The typical
gain values are tabulated in Table 1. The typical gain is 19 dB
with PGA set to 0 dB. PGA0 (Pin 14) and PGA1 (Pin 13) are used
for setting the desired gain.
The gain can be set according to Table 10. Note that the ampli-
fier full-scale input level changes as per the PGA gain setting.
Table 10. Gain Settings
PGA1
(Pin 13)
0
0
1
1
PROTECTION CIRCUITS
The ADAU1592 includes comprehensive protection circuits. It
includes thermal warning, thermal overheat, and overcurrent or
short-circuit protection on the outputs. The ERR and OTW
outputs are open-drain and require external pull-up resistors.
The outputs are capable of sinking 10 mA. The open-drain
outputs are useful in multichannel applications where more
than one ADAU1592 is used. The error outputs of multiple
ADAU1592s can be OR’ e d to simplify the system design. The
logic outputs of the error flags ease the system design of using
a microcontroller.
THERMAL PROTECTION
Thermal protection in the ADAU1592 is categorized into two
error flags: one as thermal warning and the other as thermal
shutdown. When the device junction temperature reaches near
135°C (±5°C), the ADAU1592 outputs a thermal warning error
flag by pulling OTW (Pin 10) low. This flag can be used by the
microcontroller in the system for indication to the user or can
be used to lower the input level to the amplifier to prevent
thermal shutdown. The device continues operation until
shutdown temperature is reached.
When the device junction temperature exceeds 150°C, the
device outputs an error flag by pulling ERR (Pin 9) low. This
error flag is latched. To restore the operation, MUTE (Pin 15)
needs to be toggled to low and then to high again.
OVERCURRENT PROTECTION
The overcurrent protection in the ADAU1592 is set internally
at a 5 A peak output current. The device protects the output
devices against excessive output current by pulling ERR (Pin 9)
low. This error flag is latched. To restore the normal operation,
MUTE (Pin 15) needs to be toggled to low and then to high
again. The error flag is useful for the microcontroller in the
system to indicate abnormal operation and to initiate the audio
MUTE sequence. The device senses the short-circuit condition
PGA0
(Pin 14)
0
1
0
1
PGA
Gain (dB)
0
6
12
18
Amplifier
Gain (dB)
19
25
31
37
Full-Scale
Input Level
(V
1
0.5
0.25
0.125
rms
)