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MAX9708
20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier
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Status
Active: In Production.
Description
The MAX9708 mono/stereo, Class D audio power amplifier delivers up to 2 x 21W into an 8Ω stereo mode and 1 x 42W into a 4Ω load in mono mode while offering up to 87% efficiency. The MAX9708 provides Class AB amplifier performance with the benefits of Class D efficiency, eliminating the need for a bulky heatsink and conserving power. The MAX9708 operates from a single +10V to +18V supply, driving the load in a BTL configuration.
The MAX9708 offers two modulation schemes: a fixed-frequency modulation (FFM) mode, and a spread-spectrum modulation (SSM) mode that reduces EMI-radiated emissions. The MAX9708 can be synchronized to an external clock from 600kHz to 1.2MHz. A synchronized output allows multiple units to be cascaded in the system.
Features include fully differential inputs, comprehensive click-and-pop suppression, and four selectable-gain settings (22dB, 25dB, 29.5dB, and 36dB). A pin-programmable thermal flag provides seven different thermal warning thresholds. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition.
The MAX9708 is available in 56-pin TQFN (8mm x 8mm x 0.8mm) and 64-pin TQFP (10mm x 10mm x 1.4mm) packages, and is specified over the extended -40°C to +85°C temperature range.
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Data Sheet
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An evaluation kit is available: MAX9708EVKIT
Key Features
- 2 x 21W Output Power in Stereo Mode (8Ω, THD = 10%)
- 1 x 42W Output Power in Mono Mode (4Ω, THD = 10%)
- High Efficiency: Up to 87%
- Filterless Class D Amplifier
- Unique Spread-Spectrum Mode
- Programmable Gain (+22dB, +25dB, +29.5dB, +36dB)
- High PSRR (90dB at 1kHz)
- Differential Inputs Suppress Common-Mode Noise
- Shutdown and Mute Control
- Integrated Click-and-Pop Suppression
- Low 0.1% THD+N
- Current Limit and Thermal Protection
- Programmable Thermal Flag
- SYNC Input/Output
- Available in Thermally Efficient, Space-Saving Packages: 56-Pin TQFN and 64-Pin TQFP
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Applications/Uses
- Automotive
- LCD TVs
- PC/HiFi Audio Solutions
- PDP TVs
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Key Specifications:
| Speaker Amplifiers |
| Part Number |
Class |
Spkr. Amp. VCC
(V) |
Spkr. Amp. VCC
(V) |
Spkr. Amp. ICC
(mA) |
POUT into 4Ω @ 1% THD+N
(W) |
POUT into 4Ω @ 10% THD+N
(W) |
POUT into 8Ω @ 1% THD+N
(W) |
POUT into 8Ω @ 10% THD+N
(W) |
Spkr. Amp. Half Pwr. THD+N
(%) |
SNR
(dB) |
PSRR
(dB) |
Spkr. Amp. Ext. Gain |
Spkr. Amp. Fxd. Gain
(V/V) |
Spkr. Amp. Fxd. Gain
(V/V) |
Channels |
Budgetary Price |
| min |
max |
typ |
min |
min |
min |
min |
A- Weighted |
min |
min |
max |
See Notes |
| MAX9708 |
D |
10 |
18 |
20 |
32 |
42 |
16 |
21 |
0.15 |
95 |
90 |
No |
12.6 |
63 |
2 |
$2.98 @1k |
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See All Speaker Amplifiers (41)
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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
Simplified Block Diagram: Stereo Mode
Simplified Block Diagram: Mono Mode
Application Notes
Reliability Reports
| 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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| MAX9708ETN+D
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Active |
TQFN;56 pin;65.6 mm²
Outline Drawing:21-0135 (PDF)
Land Pattern: 90-0047 (PDF)
Use pkgcode/variation: T5688+3*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9708ETN+TD
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Active |
TQFN;56 pin;65.6 mm²
Outline Drawing:21-0135 (PDF)
Land Pattern: 90-0047 (PDF)
Use pkgcode/variation: T5688+3*
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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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Similar Products by Function
| MAX9741 |
12W+12W, Low-EMI, Spread-Spectrum, Stereo, Class D Amplifier |
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More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-3678
Rev 2;
2006-05-26
This page last modified: 2010-05-24
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