MAX9708

20W/40W, Filterless, Spread-Spectrum,

Mono/Stereo, Class D Amplifier

9

Maxim Integrated

Pin Description (continued)

PIN

NAME

FUNCTION

8

C1N

Charge-Pump Flying Capacitor C1, Negative Terminal

9

C1P

Charge-Pump Flying Capacitor C1, Positive Terminal

10

11

SYNCOUT

Open-Drain, Slew-Rate Limited Clock Output. Pullup with a 10k

Ω resistor to REG.

13

SYNCIN

Clock Synchronization Input. Allows for synchronization of the internal oscillator with an external clock.

Ω resistor.

14

FS2

Frequency Select 2

15

FS1

Frequency Select 1

16

INL-

Left-Channel Negative Input (Stereo Mode Only)

17

INL+

Left-Channel Positive Input (Stereo Mode Only)

18

MONO

Mono/Stereo Mode Input. Drive logic-high for mono mode. Drive logic-low for stereo mode.

19, 20, 21

REG

Internal Regulator Output Voltage (6V). Bypass with a 0.01µF capacitor to GND.

22, 23

GND

Analog Ground

24

SS

Soft-Start. Connect a 0.47µF capacitor to GND to utilize soft-start power-up sequence.

25

Analog Power Supply. Bypass to GND with a 0.1µF capacitor as close to pin as possible.

26

INR-

Right-Channel Negative Input. In mono mode, INR- is the negative input.

27

INR+

Right-Channel Positive Input. In mono mode, INR+ is the positive input.

28

G1

Gain Select Input 1

29

G2

Gain Select Input 2

30

SHDN

Active-Low Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low to place the

device in shutdown mode.

31

MUTE

Active-Low Mute Input. Drive logic-low to place the device in mute. In mute mode, Class D output

with a 100k

Ω resistor.

32

TEMP

Thermal Flag Output, Open Drain. Pull up with a 10k

Ω resistor to REG.

33

TH2

Temperature Flag Threshold Select Input 2

34

TH1

Temperature Flag Threshold Select Input 1

35

TH0

Temperature Flag Threshold Select Input 0

45, 46

OUTR-

Right-Channel Negative Output

47, 48

OUTR+

Right-Channel Positive Output

51, 52

OUTL-

Left-Channel Negative Output

53, 54

OUTL+

Left-Channel Positive Output

EP

EP

Exposed Paddle. Connect to GND with multiple vias for best heat dissipation.