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Maxim > Products > [Amplifiers and Comparators]  [Audio]  [Automotive] 
MAX9722
5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown

Next-Generation DirectDrive Headphone Amplifiers Offer Differential Inputs and 5V Operation


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 500kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX9722A/MAX9722B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The MAX9722A/MAX9722B use a unique, patented DirectDrive™ architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, which saves cost, board space, and component height. Additionally, the gain of the amplifier is set internally (-2V/V, MAX9722B) or adjusted externally (MAX9722A). The MAX9722A/MAX9722B deliver up to 70mW per channel into a 16Ω load or 130mW into a 32Ω load and have low 0.009% THD+N. An 80dB at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. The MAX9722A/MAX9722B include ±8kV ESD protection on the headphone outputs. Comprehensive anticlick-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces the supply current to 0.1µA.

The MAX9722A/MAX9722B operate from a single 2.4V to 5.5V supply, consume only 5.5mA of supply current, feature short-circuit and thermal-overload protection, and are specified over the extended -40°C to +85°C temperature range. The devices are available in tiny 16-pin thin QFN (3mm x 3mm x 0.8mm) and 16-pin TSSOP packages.

An evaluation kit is available:  MAX9722AEVKIT  

Key Features   Applications/Uses
  • 2.4V to 5.5V Single-Supply Operation
  • High PSRR (80dB at 217Hz) Eliminates LDO
  • No Bulky DC-Blocking Capacitors Required
  • Ground-Referenced Outputs Eliminate DC Bias Voltage on Headphone Ground Pin
  • No Degradation of Low-Frequency Response Due to Output Capacitors
  • Differential Inputs for Enhanced Noise Cancellation
  • Adjustable Gain (MAX9722A) or Fixed -2V/V Gain (MAX9722B)
  • 130mW per Channel into 32Ω
  • Low 0.009% THD+N
  • Integrated Click-and-Pop Suppression
  • Low Quiescent Current (5.5mA)
  • Short-Circuit and Thermal-Overload Protection
  • ±8kV ESD-Protected Amplifier Outputs (Human Body Model)
  • Available in a Space-Saving 16-Pin Thin QFN (3mm x 3mm x 0.8mm) Package

 
  		• Cell Phones
  		• Flat-Panel Monitors
  		• MP3 Players
  		• Notebook and Desktop PCs
  		• PDAs
  		• Portable Audio Equipment
  		• Smartphones

    Key Specifications:  Headphone Amplifiers
    Part Number Hdph. Amp. VCC
    (V)    		 Hdph. Amp. VCC
    (V)    		 Hdph. Amp. ICC
    (mA)    		 Hdph. Amp. POUT into 32Ω
    (mW)    		 Hdph. Amp. Half Pwr. THD+N
    (%)    		 SNR
    (dB)    		 PSRR
    (dB)    		 Hdph. Amp. Ext. Gain Hdph. Amp. Fxd. Gain
    (|V/V|)    		 Hdph. Amp. Fxd. Gain
    (|V/V|)    		 Features Industry Qualified Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max typ @ 1% THD+N A- Weighted min min max max w/pins See Notes
    MAX9722  2.4 5.5 5.5 130 0.015 103 90 Yes 2 2 Common-Mode Sense Automotive - General
    TQFN/16
    TSSOP/16
    		 10 $0.49 @1k
    See All Headphone Amplifiers (15)

    Diagram
    MAX9722: Typical Application Circuit
    Typical Application Circuit

    Evaluation Kits
  		• MAX9722AEVKIT

    Design Guides
  		• Amplifiers and Sensors (PDF)
  		• Audio (PDF)

    Reliability Reports
  		• Reliability Report: MAX9722.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-12 of 12

    MAX9722A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX9722AETE    
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX9722AETE-T    
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX9722AETE+  
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9722AETE+T    
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9722AEUE+  
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9722AEUE+T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9722B Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX9722BETE    
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX9722BETE-T    
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX9722BETE+  
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9722BETE+T    
    		Active TQFN;16 pin;10 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0031 (PDF)
    Use pkgcode/variation: T1633+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9722BEUE+  
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9722BEUE+T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX9722
  		• New Product Press Release 2003-11-10 

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    Document Ref.: 19-3049; Rev 2; 2007-10-23
    This page last modified: 2009-10-08


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