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Low-Power, Low-Offset, Dual Mode, Class H DirectDrive Headphone Amplifier

Small, High-Efficiency Headphone Amplifier Delivers Outstanding Performance with Low Battery Consumption

Product Details

Key Features

Parametric specs for Headphone Amplifiers
Headphone Amplifier VCC (V) (min) 1.62
Headphone Amplifier VCC (V) (max) 1.98
Headphone Amplifier ICC (mA) (typ) 1.15
Hdph. Amp. POUT into 32Ω (mW) (@ 1% THD+N) 34
Headphone Amplifier Half-Power THD+N (%) 0.003
SNR (dB) (A- Weighted) 105
PSRR (dB) (min) 94
Headphone Amplifier External Gain No
Headphone Amplifier Fixed Gain (|V/V|) (min) 1
Headphone Amplifier Fixed Gain (|V/V|) (max) 1.41
Package/Pins WLP/12
Budgetary
Price (See Notes)
0.59
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Simplified Block Diagram

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Parameters

Parametric specs for Headphone Amplifiers
Headphone Amplifier VCC (V) (min) 1.62
Headphone Amplifier VCC (V) (max) 1.98
Headphone Amplifier ICC (mA) (typ) 1.15
Hdph. Amp. POUT into 32Ω (mW) (@ 1% THD+N) 34
Headphone Amplifier Half-Power THD+N (%) 0.003
SNR (dB) (A- Weighted) 105
PSRR (dB) (min) 94
Headphone Amplifier External Gain No
Headphone Amplifier Fixed Gain (|V/V|) (min) 1
Headphone Amplifier Fixed Gain (|V/V|) (max) 1.41
Package/Pins WLP/12
Budgetary
Price (See Notes)
0.59

Key Features

  • Second-Generation DirectDrive Technology
  • Dynamic, Class H, Dual Mode Charge Pump
  • Low Voltage Operation, VPVIN = 1.8V
  • Low Quiescent Current, 1.15mA (typ) at VPVIN = 1.8V
  • Eliminates Large Output DC-Blocking Capacitors
  • Industry-Leading Click-and-Pop Performance
  • High-Fidelity, SNR 105dB (5.6µV Output Noise)
  • Output Power 34mW into 32Ω (THD+N 1%)
  • Output Power 45mW into 16Ω (THD+N 10%)
  • Tiny, 12-Bump, 1.27mm x 1.65mm (0.4mm Lead Pitch) WLP Package

Applications/Uses

  • Cellular Phones
  • MP3 Players
  • Smartphones
  • VoIP Phones

Description

The MAX97200 is a 45mW Class H headphone amplifier that runs from a single low 1.8V supply voltage and employs Maxim's second-generation DirectDrive® technology.

The MAX97200 features a Dual Mode™ internal charge pump to generate the power rails for the amplifier. The charge-pump output can be ±PVIN/2 or ±PVIN depending on the amplitude of the output signal. When the output voltage is low, the power-supply voltage is ±PVIN/2. When the output signal demands larger output voltage, the charge pump switches modes so that a greater power-supply voltage is realized and more output power can be delivered to the load.

Second-generation DirectDrive technology improves power consumption when compared to first-generation DirectDrive amplifiers. The MAX97200 can be powered from a regulated 1.8V and have similar power consumption to a traditional DirectDrive amplifier that is powered from 0.9V.

Maxim's DirectDrive architecture uses an inverting charge pump to derive a negative voltage supply. The headphone amplifier is powered between the positive supply and the generated negative rail. This scheme allows the audio output signal to be biased about ground, eliminating the need for large DC-blocking capacitors between the amplifier output and the headphone load.

Low-output offset voltage provides very good click-and-pop performance both into and out of shutdown. High signal-to-noise ratio maintains system fidelity.

The MAX97200 is available in a tiny, 12-bump wafer level packaging (WLP 1.27mm x 1.65mm) with a small, 0.4mm lead pitch and specified over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX97200: Typical Operating Circuit MAX97200: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.