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MAX9724A, MAX9724B
60mW, DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown
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Status
Active: In Production.
Description
The MAX9724A/MAX9724B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. These devices use 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. The MAX9724 suppresses RF radiation received by input and supply traces acting as antennas and prevents the amplifier from demodulating the coupled noise. The MAX9724A offers an externally adjustable gain while the MAX9724B has an internally preset gain of -1.5V/V. The MAX9724A/MAX9724B deliver up to 60mW per channel into a 32Ω load and have low 0.02% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.
The MAX9724A/MAX9724B operate from a single 2.7V to 5.5V supply, consume only 3.5mA 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 12-bump UCSP™ (1.5mm x 2mm) and 12-pin thin QFN (3mm x 3mm x 0.8mm) packages.
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Data Sheet
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An evaluation kit is available: MAX9724AEVKIT
Key Features
- Improved RF Noise Rejection (Up to 67dB Over Typical Amplifiers)
- No Bulky DC-Blocking Capacitors Required
- Low-Power Shutdown Mode, < 0.1µA
- Adjustable Gain (MAX9724A) or Fixed -1.5V/V Gain (MAX9724B)
- Low 0.02% THD+N
- High PSRR (80dB at 1kHz) Eliminates LDO
- Integrated Click-and-Pop Suppression
- 2.7V to 5.5V Single-Supply Operation
- Low Quiescent Current (3.5mA)
- Available in Space-Saving Packages
- 12-Bump UCSP (1.5mm x 2mm)
- 12-Pin Thin QFN (3mm x 3mm x 0.8mm)
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Applications/Uses
- Cellular Phones
- DVD Players
- Handheld Gaming Consoles
- MP3 Players
- Notebook PCs
- PDAs
- 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 |
Smallest Available Pckg.
(mm2) |
| min |
max |
typ |
@ 1% THD+N |
A- Weighted |
min |
min |
max |
max w/pins |
| MAX9724A/B |
2.7 |
5.5 |
3.5 |
63 |
0.02 |
101 |
86 |
Yes |
1.5 |
1.5 |
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3.3 |
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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
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX9724AEBC+TG45
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Active |
UCSP;12 pin;3.3 mm²
Outline Drawing:21-0104 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: B12+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9724AETC+
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Active |
TQFN;12 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0017 (PDF)
Use pkgcode/variation: T1233+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9724AETC+T
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Active |
TQFN;12 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0017 (PDF)
Use pkgcode/variation: T1233+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9724BEBC+TG45
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Active |
UCSP;12 pin;3.3 mm²
Outline Drawing:21-0104 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: B12+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9724BETC+
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Active |
TQFN;12 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0017 (PDF)
Use pkgcode/variation: T1233+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9724BETC+T
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Active |
TQFN;12 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0017 (PDF)
Use pkgcode/variation: T1233+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
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.: 19-3597
Rev 6;
2009-09-01
This page last modified: 2010-05-21
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