PAM890825MW
功率25mw
较小包装3000
品牌pam
库存情况现货
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Power Supply Sequencing
Use input coupling capacitors to ensure inaudible turn-on pop. Activate the PAM8901 / PAM8908 after all audio sources have been activated and
their output voltages have settled. On powerdown, deactivate the PAM8901 / PAM8908 before deactivating the audio input source. The EN pin
controls device shutdown: Set to 0.6V or lower to deactivate the PAM8901 / PAM8908; set to 1.4V or higher to activate.
TrueCapFree Headphone Amplifiers
The TrueCapFree amplifier architecture operates from a single supply voltage and uses two internal charge pumps to generate a positive supply
and a rail for the headphone amplifier. The output voltages are centered around 0V and are capable of positive and negative voltage swings as
shown in the following drawing.
TrueCapFree amplifiers require no output DC-blocking capacitors. The headphone connector shield pin connects to ground and will interface with
headphones and non-headphone accessories. The PAM8901 / PAM8908 is a TrueCapFree amplifier.
LAYOUT RECOMMENDATIONS
Exposed Pad on PAM8901 / PAM8908
Solder the exposed metal pad on the PAM8901 / PAM8908 U-QFN3030-16 (Type US) package to the landing pad on the PCB. Connect the
landing pad to ground or leave it electrically unconnected (floating). Do not connect the landing pad to PVDD or to any other power supply voltage.
If the pad is grounded, it must be connected to the same ground as the PGND. Soldering the thermal pad is required for mechanical reliability and
enhances thermal conductivity of the package.
GND Connections
Pin Descriptions
Pin Number
Pin Name I/O/P Function
PAM8901 PAM8908
1 1 INL- I Inverting left input for differential **s. 2 2 INL+ I Non-inverting left input for differential **s.
3 3 INR+ I Inverting right input for differential **s. 4 4 INR- I Non-inverting right input for differential **s. 5 6 G0 I Gain select bit 0 6 7 G1 I Gain select bit 1
7 5 OUTR O Right headphone amplifier output. Connect to right terminal of headphone jack.
8 8 HPVSS P
Charge pump output and negative power supply for output amplifiers; connect 1µF
capacitor to GND
9 10 PGND P Power Ground
10 9 CAP- O Charge pump negative flying cap.
11 11 CAP+ O Charge pump positive flying cap.
12 14 PVDD P Power VDD.
13 12 HPVDD O Positive power supply for headphone amplifiers. Charge pump positive half VDD output.
14 16 OUTL O Left headphone amplifier output. Connect to left terminal of headphone jack.
15 15 SGND I Amplifier reference voltage.
16 13 EN I Amplifier enabled. Connect to logic low to shutdown; connect to logic high to activate
Application Information
The basic PAM8901 / PAM8908 application circuit is shown in page 2.
Gain Control
The PAM8901 / PAM8908 h
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4)
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.
Parameter Rating Unit
Supply Voltage (PVDD) 6.0 V
Input Voltage (INR+, INR-, INL+, INL-) HPVSS -0.3 to HPVDD +0.3 V
Control Interface Voltage (G0, G1, EN) -0.3 to PVDD +0.3 V
Storage Temperature -65 to +150
°C Maximum Junction Temperature +150
Soldering Temperature +250, 10sec
Note: 4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
VDD Supply Voltage Range 2.5 to 5.5 V TA Ambient Temperature Range -40 to +85
°C
TJ Junction Temperature Range -40 to +125
Thermal Information (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Package Max Unit
θJA Thermal Resistance (Junction to Ambient) U-QFN3030-16 (Type US) 35 °C/W
θJC Thermal Resistance (Junction to Case) U-QFN3030-16 (Type US) 14 °C/W
NEW PRO
Features
Patent Pending 3 Phase Power Line Shift Charge Pump
Eliminates Need for DC-Blocking Capacitors
TrueCapFree 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 Over Temperature Protection
Selectable Gain Settings: -6dB, 0dB, 3dB and 6dB
Available in Space Saving Packages: U-QFN3030-16 (Type US)
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)
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