QuickView

Technical Documents

Ordering Info

More Information

User Comments (0)

All

Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 516kB) Download   E-Mail

Description

The MAX9720 stereo headphone amplifier combines Maxim's patented DirectDrive architecture and SmartSense, an automatic mono/stereo detection feature. Conventional headphone amplifiers require a bulky DC-blocking capacitor between the headphone and the amplifier. DirectDrive produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. SmartSense automatically detects the presence of a short at either the left or right amplifier output. Under a fault condition, the shorted output is automatically disabled and the stereo input signal is automatically mixed and routed to the remaining active channel. This feature is useful in cell phone and PDA applications where a variety of headphone jacks with unknown loads can be inserted into the headphone jack socket. SmartSense prevents both damage to the amplifier and eliminates battery drain into a shorted load. The MAX9720 delivers up to 50mW per channel into a 16Ω load and has an ultra-low 0.003% THD+N. A high (92dB at 217kHz) power-supply rejection ratio (PSRR) allows the device to operate from noisy digital supplies without additional power conditioning. The gain of the MAX9720 is set internally, further reducing component count. Two gain options are available (-1V/V, MAX9720A and -1.41V/V, MAX9720B). The headphone outputs include a comprehensive click-and-pop circuitry that eliminates audible glitches on startup and shutdown. A shutdown mode provides a fast 250µs turn-on time. The MAX9720 operates from a single 1.8V to 3.6V supply and consumes only 5mA of supply current. The MAX9720 also features thermal overload protection, and is specified over the extended -40°C to +85°C temperature range. The MAX9720 is available in a tiny (2mm x 2mm x 0.6mm) 16-bump chip-scale package (UCSP™) and a 16-pin TSSOP package.

Key Features		Applications/Uses
DirectDrive Eliminates Bulky DC-Blocking Capacitors SmartSense Automatic Short Detection Low 5mA Quiescent Current Fixed Gain Eliminates External Feedback Network MAX9720A: -1V/V MAX9720B: -1.41V/V 50mW per Channel Output Power Ultra-Low 0.003% THD+N High PSRR (92dB at 217Hz) Integrated Click-and-Pop Suppression 1.8V to 3.6V Single-Supply Operation Thermal Overload Protection Available in Space-Saving Packages 16-Bump UCSP (2mm x 2mm x 0.6mm) 16-Pin TSSOP		Cell Phones MP3 Players Notebook Computers PDAs Portable Audio Equipment Smartphones Tablet PCs

Diagram

Typical Operating Circuit

Design Guides

Video (PDF) Audio (PDF)

Reliability Reports

Show FIT data for: MAX9720 Request Reliability Report for: MAX9720 MAX9720A MAX9720B

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * 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: 1-6 of 6

MAX9720A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX9720AEUE+T			Active	TSSOP;16 pin;33.4 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
MAX9720AEUE+			Active	TSSOP;16 pin;33.4 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
MAX9720AEBE-T			Active	UCSP;16 pin;4.3 mm² Outline Drawing: 21-0101 (PDF) Land Pattern: Not Available Use pkgcode/variation: B16-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX9720AEBE+T			Active	UCSP;16 pin;4.3 mm² Outline Drawing: 21-0101 (PDF) Land Pattern: Not Available Use pkgcode/variation: B16+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9720B	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX9720BEBE-T			Active	UCSP;16 pin;4.3 mm² Outline Drawing: 21-0101 (PDF) Land Pattern: Not Available Use pkgcode/variation: B16-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX9720BEBE+T			Active	UCSP;16 pin;4.3 mm² Outline Drawing: 21-0101 (PDF) Land Pattern: Not Available Use pkgcode/variation: B16+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

Topmark Coding: MAX9720 New Product Press Release 2003-05-06

Didn't Find What You Need?

Next Day Product Selection Assistance from Applications Engineers Parametric Search Applications Help

QuickView

Technical Documents

Ordering Info

More Information

Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

Price and Availability   Samples   Buy Online   Package Information   Lead-Free Information

Related Products   Notes and Comments   Evaluation Kits