PAM890825MW
功率25mw
较小包装3000
品牌pam
库存情况现货
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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
Description
The PAM8901 / PAM8908 stereo headphone driver is designed for
portable equipment where board space is at a premium. The
PAM8901 / PAM8908 uses a unique, patent pending architecture to
produce a ground-referenced output from a single supply, eliminating
the need for large DC-blocking capacitors, saving cost, board space,
and component height.
The PAM8901 / PAM8908 delivers up to 25mW per channel into a
16Ω 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 PAM8901 / PAM8908 operates from a single supply from 2.5V to
5.5V, has short-circuit and over temperature protection. Shutdown
mode reduces supply current to less than 1µA.
Example: Design for a 20Hz corner frequency with a PAM8901 / PAM8908 gain of +6dB. The input impedance table gives RIN as 13.2kΩ. The CIN
Equation shows the input coupling capacitors must be at least 0.6µF to achieve a 20Hz highpass corner frequency. Choose a 0.68µF standard
value capacitor for each PAM8901 / PAM8908 input (X5R material or better is required for best performance).
Charge Pump Flying Capacitor, HPVDD Capacitor and HPVSS Capacitor
The PAM8901 / PAM8908 uses a built-in charge pump to generate a positive and negative voltage supply for the headphone amplifiers. The
charge pump flying capacitor connects between CAP+ and CAP-. It transfers charge to generate the positive and negative supply voltage. The
HPVDD capacitor or HPVSS capacitor must be at least equal in or larger than value to the flying capacitor to allow maximum charge transfer. Use
low equivalent-series-resistance (ESR) ceramic capacitors (X5R material or bette
The input impedance, RIN, is dependent on device gain. Larger input capacitors decrease the corner frequency. See the following table for input
impedance values.
G0 Voltage G1 Voltage RIN
≤0.6V ≤0.6V 26.4kΩ
≥1.4V ≤0.6V 19.8kΩ
≤0.6V ≥1.4V 16.5kΩ
≥1.4V ≥1.4V 13.2kΩ
For a given high-pass cutoff frequency, the minimum input coupling capacitor is found as:
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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