max9720bebet Maxim Integrated Products, Inc., max9720bebet Datasheet

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max9720bebet

Manufacturer Part Number
max9720bebet
Description
50mw, Directdrive, Stereo Headphone Amplifier With Smartsense And Shutdown
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX9720BEBET.pdf (21 pages)
The MAX9720 stereo headphone amplifier combines
Maxim’s patented DirectDrive architecture and
SmartSense™, an automatic mono/stereo detection fea-
ture. Conventional headphone amplifiers require a bulky
DC-blocking capacitor between the headphone and the
amplifier. DirectDrive produces a ground-referenced out-
put from a single supply, eliminating the need for large
DC-blocking capacitors, saving cost, board space, and
component height.
SmartSense automatically detects the presence of a
short at either the left or right amplifier output. Under a
fault condition, the shorted output is automatically dis-
abled and the stereo input signal is automatically mixed
and routed to the remaining active channel. This feature
is useful in cell phone and PDA applications where a
variety of headphone jacks with unknown loads can be
inserted into the headphone jack socket. SmartSense
prevents both damage to the amplifier and eliminates
battery drain into a shorted load.
The MAX9720 delivers up to 50mW per channel into a
16Ω load and has an ultra-low 0.003% THD+N. A high
(92dB at 217kHz) power-supply rejection ratio (PSRR)
allows the device to operate from noisy digital supplies
without additional power conditioning. The gain of the
MAX9720 is set internally, further reducing component
count. Two gain options are available (-1V/V, MAX9720A
and -1.41V/V, MAX9720B). The headphone outputs
include a comprehensive click-and-pop circuitry that
eliminates audible glitches on startup and shutdown. A
shutdown mode provides a fast 250µs turn-on time.
The MAX9720 operates from a single 1.8V to 3.6V
supply and consumes only 5mA of supply current. The
MAX9720 also features thermal overload protection,
and is specified over the extended -40°C to +85°C tem-
perature range. The MAX9720 is available in a tiny
(2mm x 2mm x 0.6mm) 16-bump chip-scale package
(UCSP™) and a 16-pin TSSOP package.
19-2859; Rev 0; 4/03
SmartSense and UCSP are trademarks of Maxim Integrated
Products, Inc.
Pin Configuration and Typical Application Circuit appear at
end of data sheet.
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.
PDAs
Cellular Phones
MP3 Players
Notebook PCs
Amplifier with SmartSense and Shutdown
________________________________________________________________ Maxim Integrated Products
50mW, DirectDrive, Stereo Headphone
General Description
Smart Phones
Tablet PCs
Portable Audio Equipment
Applications
o DirectDrive Eliminates Bulky DC-Blocking
o SmartSense Automatic Short Detection
o Low 5mA Quiescent Current
o Fixed Gain Eliminates External Feedback Network
o 50mW per Channel Output Power
o Ultra-Low 0.003% THD+N
o High PSRR (92dB at 217Hz)
o Integrated Click-and-Pop Suppression
o 1.8V to 3.6V Single-Supply Operation
o Thermal Overload Protection
o Available in Space-Saving Packages
MAX9720AEBE-T
MAX9720BEBE-T
MAX9720AEUE
MAX9720BEUE
Capacitors
MAX9720A: -1V/V
MAX9720B: -1.41V/V
16-Bump UCSP (2mm x 2mm x 0.6mm)
16-Pin TSSOP
PART
R
L
IN
IN
Simplified Block Diagram
+
TEMP RANGE
-40
-40
-40
-40
o
o
o
o
Ordering Information
C to +85
C to +85
C to +85
C to +85
3.6V TO 1.8V
SUPPLY
o
o
o
o
C
C
C
C
SmartSense
MAX9720
16 UCSP-16
16 UCSP-16
16 TSSOP
16 TSSOP
PIN/BUMP-
PACKAGE
Features
R
HPS
MODE1
MODE2
ALERT
L
OUT
OUT
GAIN
(V/V)
-1.41
-1.41
-1
-1
1

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max9720bebet Summary of contents

Page 1

Rev 0; 4/03 50mW, DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown General Description The MAX9720 stereo headphone amplifier combines Maxim’s patented DirectDrive architecture and SmartSense™, an automatic mono/stereo detection fea- ture. Conventional headphone amplifiers require a bulky DC-blocking ...

Page 2

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown ABSOLUTE MAXIMUM RATINGS PGND to SGND .....................................................-0.3V to +0. .........................................................-0.3V to +0. PGND or SGND ............................................-0. and SV to PGND ...

Page 3

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown ELECTRICAL CHARACTERISTICS (continued 3.0V, PGND = SGND = 0V MODE1 MODE2 Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL ...

Page 4

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (V = 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V DD TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY -1V/V V ...

Page 5

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (V = 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V DD TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 100 10 OUTPUTS IN PHASE 1 OUTPUTS 0.1 ...

Page 6

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (V = 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V DD TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 100 OUTPUTS 10 IN PHASE 1 OUTPUTS 0.1 ...

Page 7

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (V = 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V DD TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER 100 OUTPUTS IN PHASE 10 1 OUTPUTS OUT ...

Page 8

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (V = 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V DD OUTPUT POWER vs. LOAD RESISTANCE 160 f = 1kHz 140 THD INPUTS OUT OF ...

Page 9

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (V = 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V DD CROSSTALK vs. FREQUENCY 1. 32Ω ...

Page 10

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown PIN BUMP TSSOP UCSP ...

Page 11

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown V OUT CONVENTIONAL DRIVER-BIASING SCHEME V OUT DirectDrive BIASING SCHEME Figure 1. Conventional Amplifier Output Waveform vs. MAX9720 Output Waveform Conventional single-supply headphone amplifiers have their outputs biased about a nominal ...

Page 12

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown • The voltage coefficient of the capacitor, the change in capacitance due to a change in the voltage across the capacitor, distorts the audio signal. At frequencies around the -3dB point, ...

Page 13

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown Mode Selection (MODE_) SmartSense is controlled by the two mode select inputs, MODE1 and MODE2. Table 1 shows the operat- ing modes in relation to the status of the MODE_ inputs. ...

Page 14

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown For automatic headphone detection, connect HPS to the control pin of a 3-wire headphone jack, as shown in Figure 7. With no headphone present, the output imped- ance of the amplifier ...

Page 15

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown Applications Information Power Dissipation Under normal operating conditions, linear power ampli- fiers can dissipate a significant amount of power. The maximum power dissipation for each package is given in the Absolute ...

Page 16

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown Table 2. Suggested Capacitor Manufacturers SUPPLIER PHONE Taiyo Yuden 800-348-2498 TDK 847-803-6100 Charge-Pump Capacitor Selection Use capacitors with an ESR less than 100mΩ for opti- mum performance. Low-ESR ceramic capacitors mini- ...

Page 17

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown HEADPHONE INSERTED HPS t DELAY 70mV OUT_ Figure 9. HPS Debouncing Delay Pin Configurations TOP VIEW MODE1 2 C1P 3 MAX9720 PGND 4 C1N ...

Page 18

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown V DD 0.1µF AUX_IN MAX4063 2.2kΩ BIAS 2.2kΩ 0.1µF IN+ IN- 0.1µF µC 18 ______________________________________________________________________________________ V DD 0.1µF 0.1µF 15kΩ OUT CODEC/ 15kΩ 0.1µF BASEBAND PROCESSOR 1µF OUT MODE1 MODE2 1µF ...

Page 19

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown 1. 10kΩ 1µ (A2) (D2) (C2) (B2) V MODE1 MODE2 ALERT DD 3 SHUTDOWN (D1) C1P CONTROL CHARGE C1 PUMP 1µF 5 (B1) ...

Page 20

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 20 ______________________________________________________________________________________ Package Information ...

Page 21

DirectDrive, Stereo Headphone Amplifier with SmartSense and Shutdown (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any ...

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