LX1722CDB MICROSEMI, LX1722CDB Datasheet - Page 7

• Manufacturer Part Number: LX1722CDB
• Description: Audio Amp Speaker 2-CH Stereo 60W Class-D 44-Pin SSOP
• Manufacturer: MICROSEMI

Specifications of LX1722CDB

• Package: 44SSOP
• Function: Speaker
• Amplifier Type: Class-D
• Typical Voltage Gain: 60 dB
• Total Harmonic Distortion Noise: 0.06@1W %
• Typical Psrr: 70 dB
• Output Signal Type: Differential
• Output Type: 2-Channel Stereo
• Typical Gain Bandwidth Product: 7 MHz
• Maximum Input Bias Current: 1(Typ)@15V@-20C to 70C uA
• Maximum Input Offset Voltage: 5(Typ)@15V@-20C to 70C mV
• Maximum Load Resistance: 8 Ohm

Copyright © 2001
Rev. 1.2a,2004-06-10
Frequency Synchronization
Two or more LX1721 / LX1722 oscillators can be configured for
synchronous operation. One unit, the master, is programmed for
the desired frequency with the R
Additional units will be slave units, and their oscillators will be
disabled by leaving the R
and the C
pin and the C
configuration, the CLOCK pins of the slave units begin receiving
instead of transmitting clock pulses. Also, the C
driving the PWM capacitor in the slave units. Note that for
optimum performance, all slave units should be located within a
few inches of the master unit.
PWM
I N T E G R A T E D
pin of the slave units should be tied to the CLOCK
PWM
pin of the master unit respectively. In this
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PWM
pin disconnected. The CLOCK pin
PWM
P R O D U C T S
and C
A P P L I C A T I O N I N F O R M A T I O N
PWM
Linfinity Microelectronics Division
PWM
as usual.
pins quit
Microsemi
Class-D Stereo Power Amplifier Controller
Oscillator Configuration (R
The oscillator is programmed by the external timing components
R
C
in order to keep the slope of the PWM ramp voltage proportional to
the supply voltage, both the ramp peak and valley voltages, and the
charge and discharge currents are proportional to the supply voltage.
This keeps the frequency relatively constant while keeping the slope
of the PWM ramp proportional to the voltage on the VDD pin. For
operating frequencies other than 333kHz, the frequency can be
approximated by the following equation:
PWM
PWM
AudioMAX™
should be set to 49.9kOhms and 100pF respectively. Note that
and C
Frequency
PWM
. For a nominal frequency of 333kHz, R
=
P
(
RODUCTION
. 0
577
PWM
)(
R
and C
PWM
)(
PWM
1
C
LX1721 / 1722
PWM
selection)
)
+
320
PWM
ns
and
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