Maxim MAX9777 - Manual
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Table of Contents:
- Page 2 – SHDN
- Page 4 – INT
- Page 5 – Typical Operating Characteristics
- Page 6 – Typical Operating Characteristics (continued)
- Page 7 – CROSSTALK vs. FREQUENCY; TOTAL HARMONIC DISTORTION PLUS NOISE; POWER-SUPPLY REJECTION RATIO
- Page 9 – SUPPLY CURRENT vs. SUPPLY VOLTAGE; POWER DISSIPATION vs. OUTPUT POWER
- Page 11 – Pin Description; PIN; BIAS Capacitor
- Page 12 – Detailed Description
- Page 13 – Shutdown; MUTE; Figure 2. HPS Configuration Circuit
- Page 14 – Digital Interface; Bit Transfer; START; START and STOP Conditions; SMBus is a trademark of Intel Corp.
- Page 15 – Early STOP Conditions; Write; ADD CONNECTION; C Slave Addresses
- Page 16 – Table 3. MAX9777 MUTE Register Format
- Page 17 – Read Data Format; Table; C Compatibility; Table 5. MAX9777 Control Register Format
- Page 18 – Applications Information; BTL Speaker Amplifiers
- Page 19 – Component Selection; Gain-Setting Resistors
- Page 20 – Gain Select; Bass Boost Circuit; Layout and Grounding
- Page 21 – Typical Application Circuits; Stereo 3W Audio Power Amplifiers with
- Page 23 – Functional Diagrams
- Page 25 – THIN QFN; THIN QFN; Pin Configurations
- Page 26 – Package Information
- Page 27 – © 2006 Maxim Integrated Products
General Description
The MAX9777/MAX9778 combine a stereo 3W bridge-
tied load (BTL) audio power amplifier, stereo single-
ended (SE) headphone amplifier, headphone sensing,
and a 2:1 input multiplexer all in a tiny 28-pin thin QFN
package. These devices operate from a single 4.5V to
5.5V supply and feature an industry-leading 100dB
PSRR, allowing these devices to operate from noisy
supplies without the addition of a linear regulator. An
ultra-low 0.002% THD+N ensures clean, low-distortion
amplification of the audio signal. Click-and-pop sup-
pression minimizes audible transients on power and
shutdown cycles. Power-saving features include low
4mV V
OS
(minimizes DC current drain through the
speakers), low 13mA supply current, and a 10µA shut-
down mode. A MUTE function allows the outputs to be
quickly enabled or disabled.
A headphone sense input detects the presence of a
h e a d p h o n e j a c k a n d a u t o m a t i c a l l y c o n f i g u r e s t h e
amplifiers for either speaker or headphone mode. In
speaker mode, the amplifiers can deliver up to 3W of
continuous average power into a 3
Ω
load. In head-
phone mode, the amplifier can deliver up to 200mW of
continuous average power into a 16
Ω
load. The gain of
the amplifiers is externally set, allowing maximum flexi-
bility in optimizing output levels for a given load. The
amplifiers also feature a 2:1 input multiplexer, allowing
multiple audio sources to be selected. The multiplexer
can also be used to compensate for limitations in the
frequency response of the loud speakers by selecting
an external equalizer network. The various functions are
controlled by either an I
2
C-compatible (MAX9777) or
simple parallel control interface (MAX9778).
The MAX9777/MAX9778 are available in a thermally
e f f i c i e n t 2 8 - p i n t h i n Q F N p a c k a g e ( 5 m m x 5 m m x
0.8mm). These devices have thermal-overload protec-
tion (OVP) and are specified over the extended -40°C
to +85°C temperature range.
Features
♦
Industry-Leading, Ultra-High 100dB PSRR
♦
3W BTL Stereo Speaker Amplifier
♦
200mW Stereo Headphone Amplifier
♦
Low 0.002% THD+N
♦
Click-and-Pop Suppression
♦
ESD-Protected Outputs
♦
Low Quiescent Current: 13mA
♦
Low-Power Shutdown Mode: 10µA
♦
MUTE Function
♦
Headphone Sense Input
♦
Stereo 2:1 Input Multiplexer
♦
Optional 2-Wire, I
2
C-Compatible or Parallel
Interface
♦
Tiny 28-Pin Thin QFN (5mm
x
5mm
x
0.8mm)
Package
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
________________________________________________________________
Maxim Integrated Products
1
SE/
BTL
SINGLE SUPPLY
4.5V TO 5.5V
I
2
C-
COMPATIBLE
MAX9777
LEFT IN
1
LEFT IN
2
RIGHT IN
1
RIGHT IN
2
CONTROL
Simplified Block Diagram
Ordering Information
19-0509; Rev 0; 4/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
µ
PART
CONTROL
INTERFACE
PIN-
PACKAGE
PK G
C O D E
MAX9777
ETI+
I
2
C Compatible
28 Thi n QFN - E P * T2855-6
MAX9778
ETI+
Parallel
28 Thi n QFN - E P * T2855-6
Pin Configurations and Functional Diagrams appear at end
of data sheet.
Note: All devices are specified over the -40°C to +85°C operat-
ing temperature range.
+Denotes lead-free package.
*EP = Exposed paddle.
Notebooks
Portable DVD Players
Tablet PCs
PC Audio Peripherals
Camcorders
Multimedia Monitor
Applications
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Summary
MAX9777/MAX9778 Stereo 3W Audio Power Amplifiers withHeadphone Drive and Input Mux 2 _ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ ...
MAX9777/MAX9778 Stereo 3W Audio Power Amplifiers withHeadphone Drive and Input Mux 4 _ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ ...
MAX9777/MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux _______________________________________________________________________________________ 5 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (SPEAKER MODE) MAX9777/78 toc01 FREQUENCY (Hz) THD+N (%) 10k 1k 100 0.01 0....
