LX1725ILQ Microsemi Analog Mixed Signal Group, LX1725ILQ Datasheet - Page 3

• Manufacturer Part Number: LX1725ILQ
• Description: IC AMP AUDIO 32W STER D 32MLPQ
• Manufacturer: Microsemi Analog Mixed Signal Group
• Series: AudioMAX™r
• Type: Class Dr

Specifications of LX1725ILQ

• Output Type: 1-Channel (Mono) or 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 32W x 1 @ 8 Ohm; 16W x 2 @ 4 Ohm
• Voltage - Supply: 12 V ~ 35 V, ±6 V ~ 17.5 V
• Features: Depop, Differential Inputs, Mute, PWM, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 32-MLPQ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Copyright © 2004
Rev. 1.2, 2005-12-06
OUTREF2
MASTER
VNEGA
VPOS2
VNEG2
VNEG1
VPOS1
VGND
VCOM
MUTE
OUT2
OUT1
STBY
Name
IN2M
IN2P
V5V
TM
Analog voltage sense for VNEG voltage. Needs to be protected from noise at VNEG1 and VNEG2. Typically,
about 180µA is sourced out of this pin.
Positive audio input for channel 2. The input signal should be AC-coupled into this pin. The DC bias voltage will
be equal to VREF. The input impedance to VREF will be about 17Kohm.
Negative audio input for channel 2. The input signal should be AC-coupled into this pin. The DC bias voltage will
be equal to VREF. The input impedance to VREF will be about 17Kohm.
Negative feedback input pin for channel 2. Normally connected to VCOM.
Ground reference return for the analog +5V power supply. This supply is allowed to “float” between VNEG and
VCOM. Typical current out of this pin is about 600µA.
Tri-level control pin. When this pin is set to greater than V5V/2, the audio signal path is muted. For voltages
between V5V/4 and V5V/2, the audio gain will be set to approximately 5V/V. This allows the “Low Gain” mode to
be tested. For voltages less than V5V/4, the normal 10V/V gain is in place.
Quad-level control pin. This pin has three thresholds to enable Master/Slave and the “Quick” test mode. Quick
mode forces the internal 65224 clock counter to be bypassed in order to speed-up production testing.
Here is how the various modes are mapped:
Normally, this pin should be shorted to either V5V or GND.
Positive voltage supply to channel 2’s output buffer. In a split supply system, this voltage will range between +5V
up to +15V. In a single supply system, this voltage is allowed to be +10V up to +30V. Power supply de-coupling
capacitance should be placed between VPOS2 and VNEG2.
PWM output for channel 2. This pin drives the L-C low pass filter prior to driving the speaker.
Negative voltage supply to channel 2’s output buffer. In a split supply system, this voltage will range between –
5V down to –15V. In a single supply system, this represents the 0V point.
Negative voltage supply to channel 1’s output buffer. In a split supply system, this voltage will range between –
5V down to –15V. In a single supply system, this represents the 0V point.
PWM output for channel 1. This pin drives the L-C low pass filter prior to driving the speaker.
Positive voltage supply to channel 1’s output buffer. In a split supply system, this voltage will range between +5V
up to +15V. In a single supply system, this voltage is allowed to be +10V up to +30V. Power supply de-coupling
capacitance should be placed between VPOS1 and VNEG1.
A logic high as this pin forces a zero current standby mode. CMOS logic levels.
Mid-voltage supply for both channel 1 and channel 2. This voltage should be half way between VPOS and
VNEG. De-coupling capacitance should be placed between this pin and both VPOS and VNEG.
Analog +5V supply for the signal processing section. This pin is referenced to VGND. For voltages less than 4V,
the under voltage lockout circuit will keep the part in sleep mode. De-coupling capacitance should be placed
between this pin and VGND.
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
F U N C T I O N A L P I N D E S C R I P T I O N ( C O N T I N U E D )
< V5V/4
< V5V/2, >V5V/4
< 3*V5V/4, >V5V/2
> 3*V5V/4
Integrated Products Division
V @ Master
®
Microsemi
Description
Slave, Normal Mode
Slave, Quick mode
Master, Quick mode
Master, Normal mode
15W+15W Stereo Class-D Amplifier
Filterless 30W Mono in BTL
P
Mode
RODUCTION
D
ATA
S
HEET
LX1725
Page
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