Description

The PAM8908 stereo headphone driver is designed for portable equipment where board space is at a premium. The PAM8908 uses a unique, patent pending architecture to produce a ground-referenced output from a single supply, eliminating the need for large DCblocking capacitors, saving cost, board space, and component height.

The PAM8908 delivers up to 60mW per channel into a 32Ω load and has low 0.03% THD+N. A high power-supply rejection ratio (80dB at 1kHz) allows this device to operate from noisy digital supplies without an additional linear regulator.

The PAM8908 operates from a single supply from 2.5V to 5.5V and has short-circuit and overtemperature protections. Shutdown mode reduces supply current to less than 1µA.

Feature(s)

Patent Pending 3 Phase Power Line Shift Charge Pump Eliminates Need for DC-Blocking Capacitors
True Cap Free Architecture, Output Biased at 0V (System Ground)
Excellent Low Frequency Fidelity
80dB PSRR at 1kHz
Less than 1µA Shutdown Current
Support Both Fully Differential and Single-Ended Inputs
Short-Circuit and Overtemperature Protections
Selectable Gain Settings: -6dB, 0dB, 3dB and 6dB
Available in Space-Saving Package: U-QFN3030-16 Standard
Lead-Free and Green Devices Available (RoHS Compliant)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/

Application(s)

Smart phones/cellular phones
Notebook computers
Portable DVD players
Personal digital assistants (PDAs)
Electronic dictionaries
Digital still cameras
Portable gaming

Specifications & Technical Documents

Product Parameters

Compliance (Only Automotive Supports PPAP)	Standard
AEC Qualified	No
Input Type	Analog In
Category	Headphone Amplifier
Minimum V_DD (V)	2.5
Maximum V_DD (V)	5.5 V
Mono or Stereo	Stereo
Architecture	Class AB
I_{Q (mA)}	4 mA
Minimum Load (Ω)	16
Control Interface	Hardware
Power/CH (W) @ THD=10%	0.09
Power/CH (W) @ THD=1%	0.06
Headphone Out	Yes
Efficiency (%)	50 %
SNR	100 dB

Technical Documents

Application Notes

PAM8908-as-Audio-Line-Driver.pdf (669 KB)

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2512	2021-04-16	2021-07-16	Qualified Additional Assembly & Test (A/T) Site

PAM8908