Does this come with instructions on how to connect to the Raspberry Pi?

Hi,No, instructions available online by adafruit.e-s

How can I wire headphone jack, speaker and Arduino with this amp?

The screw connector is for the speaker. the connections marked A+ and A- are for the input connections. I think you need a mono jack plug and the A+ should be connected the main part of the plug and the A- to the edge.

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Description

🔊 Amplify your audio game with power and precision!

POWERFUL 2 5 W OUTPUT - Crystal-clear sound that fills any room with ease.
SMART SAFETY FEATURES - Thermal and over-current protection keep your gear safe and sound.
PRECISION VOLUME CONTROL - Onboard trim potentiometer lets you dial in the perfect audio level.
BRIDGE TIED OUTPUT DESIGN - Direct speaker connection for cleaner, distortion-free sound.
NEXT GEN CLASS D EFFICIENCY - Maximize battery life and minimize heat with cutting-edge tech.

The AdafruitMono 2.5W Class D Audio Amplifier (PAM8302, 2130) delivers efficient, high-quality sound output with 2.5 watts into 4-8 ohm speakers. Featuring a Class-D controller for low power consumption, built-in thermal and over-current protection, a fixed 24dB gain, and an onboard trim potentiometer for volume adjustment, it ensures reliable and customizable audio performance. Its bridge-tied output design connects directly to speaker pins, enhancing sound clarity and reducing distortion.

Specifications

Item dimensions L x W x H	3.54 x 2.36 x 0.39 inches
Voltage	5.5 Volts
Manufacturer	Adafruit
Maximum Supply Voltage	5.5 Volts (DC)
Minimum Supply Voltage	2 Volts (DC)
Mounting Type	Surface Mount
Brand	Adafruit
Number of Channels	1
Output Power	2.5 Watts
Package Type Name	box or padded envelope
Supply Current	4 Milliamps
UPC	748347525977 711978442135
Item model number	PAM8302
Item Weight	0.705 ounces
Product Dimensions	3.54 x 2.36 x 0.39 inches
Item Dimensions LxWxH	3.54 x 2.36 x 0.39 inches
ASIN	B00PY2YSI4
Is Discontinued By Manufacturer	No
Date First Available	January 15, 2015

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