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MAX9728, MAX9728A, MAX9728B
60mW, DirectDrive, Stereo Headphone Amplifier with Shutdown
60mW DirectDrive Headphone Amplifiers Ideal for TV and Notebook Applications
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Status
Active: In Production.
Description
The MAX9728A/MAX9728B stereo headphone amplifiers are designed for display and notebook applications or 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 MAX9728A offers an externally adjustable gain, while the MAX9728B has an internally preset gain of -1.5V/V. The MAX9728A/MAX9728B 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 MAX9728A/MAX9728B operate from a single 4.5V 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-pin Thin QFN (3mm x 3mm x 0.8mm) and 14-pin TSSOP packages (5mm x 4.4mm x 1.1mm).
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Data Sheet
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An evaluation kit is available: MAX9728AEVKIT
Key Features
- No Bulky DC-Blocking Capacitors Required
- Low-Power Shutdown Mode, < 0.1µA
- Adjustable Gain (MAX9728A) or Fixed -1.5V/V Gain (MAX9728B)
- Low 0.02% THD+N
- High PSRR (80dB at 1kHz) Eliminates LDO
- Integrated Click-and-Pop Suppression
- 4.5V to 5.5V Single-Supply Operation
- Low Quiescent Current (3.5mA)
- Available in Space-Saving Packages
- 12-Pin Thin QFN (3mm x 3mm x 0.8mm)
- 14-Pin TSSOP (5mm x 4.4mm x 1.1mm)
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Applications/Uses
- CRT TVs
- DVD Players
- LCD/PDP Displays
- Multimedia Monitors
- Notebook PCs
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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) |
Budgetary Price |
| min |
max |
typ |
@ 1% THD+N |
A- Weighted |
min |
min |
max |
max w/pins |
See Notes |
| MAX9728 |
4.5 |
5.5 |
3.5 |
63 |
0.02 |
101 |
86 |
Yes |
1.5 |
1.5 |
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33.4 |
$0.45 @1k |
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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
 Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
| Reliability Report: |
MAX9728.pdf |
| Show FIT data for: |
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| Request Reliability Report for: |
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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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| MAX9728AETC+
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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 |
| MAX9728AETC+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 |
| MAX9728AEUD+
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Active |
TSSOP;14 pin;33.4 mm²
Outline Drawing:21-0066 (PDF)
Land Pattern: 90-0113 (PDF)
Use pkgcode/variation: U14+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9728AEUD+T
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Active |
TSSOP;14 pin;33.4 mm²
Outline Drawing:21-0066 (PDF)
Land Pattern: 90-0113 (PDF)
Use pkgcode/variation: U14+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9728BETC+
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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 |
| MAX9728BETC+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 |
| MAX9728BEUD+
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Active |
TSSOP;14 pin;33.4 mm²
Outline Drawing:21-0066 (PDF)
Land Pattern: 90-0113 (PDF)
Use pkgcode/variation: U14+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9728BEUD+T
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Active |
TSSOP;14 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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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.: 19-3963
Rev 1;
2009-12-07
This page last modified: 2010-10-01
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