Automotive DirectDrive Headphone Amplifiers

with Output Protection and Diagnostics

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7

Pin Description

Typical Operating Characteristics (continued)

∞, gain = -1.5V/V, THD+N measurement bandwidth = 22Hz to 22kHz,

PIN

NAME

FUNCTION

1

INL

Inverting Left-Channel Audio Input

2, 4

SGND

Amplifier Signal Ground. The noninverting inputs of the amplifiers are connected to the amplifier

signal ground. Connect both to the signal ground plane.

3

INR

Inverting Right-Channel Audio Input

Amplifier Positive-Power Supply. Connect to positive supply. Bypass with a 1µF capacitor to

SGND as close to the pin as possible.

6

SHDN

Active-Low Shutdown Input

7

CPVDD

Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and oscillator.

Connect to positive supply. Bypass with a 1µF capacitor to PGND as close to the pin as possible.

8

C1P

Flying-Capacitor Positive Terminal. Connect a 1µF capacitor between C1P and C1N.

9, 15

PGND

Power Ground. Connect both to the power ground plane.

10

C1N

Flying-Capacitor Negative Terminal. Connect a 1µF capacitor between C1P and C1N.

11

CPVSS

12

DIAG

Diagnostic Voltage Output

13

OUTR

Right-Channel Output

14

Amplifier Negative Power Supply. Connect to CPVSS.

16

OUTL

Left-Channel Output

ENTERING SHUTDOWN TRANSIENT

MAX13330/31 toc27

200

μs/div

1V/div

1V/div

5V/div

POWER-UP/-DOWN TRANSIENT

MAX13330/31 toc28

10ms/div

1V/div

1V/div

5V/div