MIKROE-2779

MIKROE-2779 Datasheet

PID MIKROE-2779 Weight 30 g

Part	Datasheet
MIKROE-2779	MIKROE-2779 (pdf)

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2x20W Amp click PID MIKROE-2779 Weight 30 g 20W, stereo, high-performance digital amplifier 2x20W Amp click carries the MAX9744 stereo class D audio power amplifier from Maxim Integrated. This click brings the Class AB sound performance with Class D efficiency. The perfect combination for your speakers. 2x20W Amp click also offers 64 step volume control,single-supply operation, adjustable gain, and industry-leading click-and-pop suppression. How the click works Class-D amplifiers work by producing a series of square-shaped pulses of fixed amplitude, but varying duty cycle, representing the amplitude variations of the analog signal. The output of the modulator is used to gate the output transistors on and off, alternately. The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors. Since the transistors are either fully ON or fully OFF, they spend a small amount of time in the linear region and consume little amounts of power. In a Class D amplifier, the output transistors act as current steering switches and don't use a lot of additional power. A low-pass filter made of an inductor and a capacitor is used to produce a path for the low-frequencies of the audio signal leaving the high-frequency pulses behind . When the output current exceeds the current limit, 5.5A typ , the MAX9744 disables the outputs and initiates a 220µs startup sequence. The shutdown and startup sequence is repeated until the output fault is removed. When the die temperature exceeds the thermal-shutdown threshold, +165°C typ , the MAX9744 outputs are disabled. Normal operation resumes when the die temperature decreases by a factor equal to the thermal-shutdown threshold minus the thermal-shutdown hysteresis, typically below +150°C . Power supply The board logic is powered from the 3.3V supply over the mikroBUS socket, while the amplifier circuit is powered by the onboard 5V power supply or an external source that can go from 4.5V to 14V. In order to use an external power source, the jumper JP1 must be positioned to the EXT position see more in the Jumpers and Settings table . Shutdown mode The MAX9744 features a shutdown mode that reduces power consumption and extends battery life. Driving SHDN pin low places the device in low-power shutdown mode. Connect SHDN pin to digital high for normal operation. Volume control For maximum flexibility, the click features volume control operation using an analog voltage input or through the I2C interface. To set the device to analog mode, connect ADDR1 and ADDR2 to GND. In analog mode, SDA/VOL pin is an analog input for volume control. The analog input range is ratiometric between x VDD and x VDD where x VDD = full mute and x VDD = full volume. Use ADDR1 and ADDR2 to select I2C mode. There are three addresses that can be chosen, allowing for multiple devices on a single bus. In the I2C mode, the volume is controlled by choosing the speaker volume control register in the command byte. There are 64 volume settings, where the lowest setting is full mute. Specifications Type Applications Programming Key Features Key Benefits Amplifier Battery powered devices, mobile phones, portable sound systems, etc. MAX9744 20W stereo Class D audio power amplifier 20W Stereo Output, integrated volume control, high 93% efficiency 64 step volume control Interface Input Voltage 3.3V,5V Click board size L x mm Pinout diagram This table shows how the pinout on 2x20W Amp click corresponds to the pinout on the mikroBUS socket the latter shown in the two middle columns . Notes Notes NC 1 AN PWM 16 ADDR1 Address Select Input Shutdown Input #SHDN 2 RST INT 15 ADDR2 Address Select Input Mute Input MUTE 3 CS TX 14 NC NC 4 SCK RX 13 NC NC 5 MISO SCL 12 SCL I2C Serial Clock NC 6 MOSI SDA 11 SDA I2C Serial Data Power supply +3.3V 7 3.3V 5V 10 +5V Ground GND 8 GND 9 GND Ground • ADDR1 and ADDR2 - Sets the device address for the I2C address option. Connect ADDR1 and ADDR2 to GND to select analog volume control mode. • MUTE - Drive the MUTE pin high to mute the speaker outputs. Connect MUTE to GND for normal operation mute function controls speaker outputs . • SHDN - Drive SHDN low to disable the audio amplifiers. Connect SHDN to VDD or drive high for normal operation. • SCL - I2C Serial Clock Input and Modulation Scheme Select. In I2C mode ADDR1 and ADDR2 GND , acts as the I2C serial clock input. When ADDR1 and ADDR2 = GND, set SCLK = 1 for standard PWM output scheme, or set SCLK = 0 for filterless modulation output scheme.

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2x20W Amp click

PID MIKROE-2779 Weight 30 g
20W, stereo, high-performance digital amplifier
2x20W Amp click carries the MAX9744 stereo class D audio power amplifier from Maxim Integrated. This click brings the Class AB sound performance with Class D efficiency. The perfect combination for your speakers. 2x20W Amp click also offers 64 step volume control,single-supply operation, adjustable gain, and industry-leading click-and-pop suppression.

How the click works

Class-D amplifiers work by producing a series of square-shaped pulses of fixed amplitude, but varying duty cycle, representing the amplitude variations of the analog signal.

The output of the modulator is used to gate the output transistors on and off, alternately. The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors. Since the transistors are either fully ON or fully OFF, they spend a small amount of time in the linear region and consume little amounts of power. In a Class D amplifier, the output transistors act as current steering switches and don't use a lot of additional power. A low-pass filter made of an inductor and a capacitor is used to produce a path for the low-frequencies of the audio signal leaving the high-frequency pulses behind .

When the output current exceeds the current limit, 5.5A typ , the MAX9744 disables the outputs and initiates a 220µs startup sequence. The shutdown and startup sequence is repeated until the output fault is removed.

When the die temperature exceeds the thermal-shutdown threshold, +165°C typ , the MAX9744 outputs are disabled. Normal operation resumes when the die temperature decreases by a factor equal to the thermal-shutdown threshold minus the thermal-shutdown hysteresis, typically below +150°C .

Power supply The board logic is powered from the 3.3V supply over the mikroBUS socket, while the amplifier circuit is powered by the onboard 5V power supply or an external source that can go from 4.5V to 14V. In order to use an external power source, the jumper JP1 must be positioned to the EXT position see more in the Jumpers and Settings table .

Shutdown mode The MAX9744 features a shutdown mode that reduces power consumption and extends battery life. Driving SHDN pin low places the device in low-power shutdown mode. Connect SHDN pin to digital high for normal operation.

Volume control For maximum flexibility, the click features volume control operation using an analog voltage input or through the I2C interface. To set the device to analog mode, connect ADDR1 and ADDR2 to GND. In analog mode, SDA/VOL pin is an analog input for volume control. The analog input range is ratiometric between x VDD and x VDD where x VDD = full mute and x VDD = full volume.

Use ADDR1 and ADDR2 to select I2C mode. There are three addresses that can be chosen, allowing for multiple devices on a single bus. In the I2C mode, the volume is controlled by choosing the speaker volume control register in the command byte. There are 64 volume settings, where the lowest setting is full mute.

Specifications

Type Applications Programming Key Features Key Benefits

Amplifier Battery powered devices, mobile phones, portable sound systems, etc. MAX9744 20W stereo Class D audio power amplifier 20W Stereo Output, integrated volume control, high 93% efficiency 64 step volume control

Interface

Input Voltage 3.3V,5V

Click board size L x mm

Pinout diagram

This table shows how the pinout on 2x20W Amp click corresponds to the pinout on the mikroBUS socket the latter shown in the two middle columns .

Notes

Notes

NC 1 AN PWM 16 ADDR1 Address Select Input

Shutdown Input #SHDN 2 RST INT 15 ADDR2 Address Select Input

Mute Input

MUTE 3 CS

TX 14 NC

NC 4 SCK RX 13 NC

NC 5 MISO SCL 12 SCL

I2C Serial Clock

NC 6 MOSI SDA 11 SDA

I2C Serial Data

Power supply +3.3V 7 3.3V 5V 10 +5V

Ground

GND 8 GND 9 GND

Ground
• ADDR1 and ADDR2 - Sets the device address for the I2C address option. Connect ADDR1 and ADDR2 to GND to select analog volume control mode.
• MUTE - Drive the MUTE pin high to mute the speaker outputs. Connect MUTE to GND for normal operation mute function controls speaker outputs .
• SHDN - Drive SHDN low to disable the audio amplifiers. Connect SHDN to VDD or drive high for normal operation.
• SCL - I2C Serial Clock Input and Modulation Scheme Select. In I2C mode ADDR1 and ADDR2 GND , acts as the I2C serial clock input. When ADDR1 and ADDR2 = GND, set SCLK = 1 for standard PWM output scheme, or set SCLK = 0 for filterless modulation output scheme.

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Datasheet ID: MIKROE-2779 649429