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MAX9721
1V, Fixed-Gain, DirectDrive®, Stereo Headphone Amplifier with Shutdown
1V, Fixed-Gain, DirectDrive, Stereo-Headphone Amplifier with Shutdown Ideal for Portable Equipment where Board Space Is at a Premium
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Status
Active: In Production.
Description
The MAX9721 fixed-gain, stereo headphone amplifier is ideal for portable equipment where board space is at a premium. The MAX9721 uses a unique DirectDrive 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. Fixed gains of -2V/V (MAX9721A), -1.5V/V (MAX9721B), and -1V/V (MAX9721C) further reduce external component count.
The MAX9721 delivers up to 20mW per channel into a 32Ω load and achieves 0.006% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows the MAX9721 to operate from noisy digital supplies without an additional linear regulator. The MAX9721 includes ±8kV ESD protection on the headphone output. Comprehensive click-and-pop circuitry suppresses audible clicks and pops at startup and shutdown. A low-power shutdown mode reduces supply current to 1.0µA (typ).
The MAX9721 operates from a single 0.9V to 1.8V supply allowing the device to be powered directly from a single AA or AAA battery. The MAX9721 consumes only 2.2mA of supply current, provides short-circuit protection, and is specified over the extended -40°C to +85°C temperature range. The MAX9721 is available in a tiny (1.54mm x 2.02mm x 0.6mm), 12-bump chip-scale package (UCSP™) and a 12-pin thin QFN package (4mm x 4mm x 0.8mm).
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Data Sheet
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An evaluation kit is available: MAX9721EVKIT
Key Features
- Single Cell, 0.9V to 1.8V Single-Supply Operation
- Fixed Gain Eliminates External Feedback Network
- MAX9721A: -2V/V
- MAX9721B: -1.5V/V
- MAX9721C: -1V/V
- Ground-Referenced Outputs Eliminate DC Bias
- No Degradation of Low-Frequency Response Due to Output Capacitors
- 20mW per Channel into 32Ω
- Low 0.006% THD+N
- High PSRR (80dB at 1kHz)
- Integrated Click-and-Pop Suppression
- Low Quiescent Current (2.2mA)
- Low-Power Shutdown Control
- Short-Circuit Protection
- ±8kV ESD-Protected Amplifier Outputs
- Available in Space-Saving Packages
- 12-Bump UCSP (1.54mm x 2.02mm x 0.6mm)
- 12-Pin Thin QFN (4mm x 4mm x 0.8mm)
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Applications/Uses
- Cell Phones
- MP3 Players
- PDAs
- Portable Audio Equipment
- Smartphones
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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|) |
Package/Pins |
| min |
max |
typ |
@ 1% THD+N |
A- Weighted |
min |
min |
max |
| MAX9721 |
0.9 |
1.8 |
2.2 |
20 |
0.008 |
92 |
70 |
No |
1 |
2 |
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See All Headphone Amplifiers (18)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Functional Diagram
Product Guides
Reliability Reports
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Software/Models
Ordering Information
This product cannot be purchased through our web site. Contact factory for availability.
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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.
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Information Index
Document Ref.: 19-3167
Rev 0;
2004-02-16
This page last modified: 2010-05-18
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