MAX9850ETI+T Maxim Integrated Products, MAX9850ETI+T Datasheet

IC AMP AUDIO .095W STER 28TQFN

MAX9850ETI+T

Manufacturer Part Number
MAX9850ETI+T
Description
IC AMP AUDIO .095W STER 28TQFN
Manufacturer
Maxim Integrated Products
Series
DirectDrive™r
Type
Class ABr
Datasheet
1.MAX9850ETI.pdf (36 pages)

Specifications of MAX9850ETI+T

Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
95mW x 2 @ 16 Ohm
Voltage - Supply
1.8 V ~ 3.6 V
Features
DAC, Depop, Digital Inputs, I²C, I²S, Line Level Inputs & Outputs, Mute, Shutdown, Volume Control
Mounting Type
Surface Mount
Package / Case
28-WQFN Exposed Pad, 28-HWQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX9850 is a low-power, high-performance stereo
audio DAC with an integrated DirectDrive headphone
amplifier. The MAX9850 is designed to meet the board
space and performance requirements of portable devices
such as cell phones and MP3 and portable DVD players.
The MAX9850 uses Maxim’s DirectDrive headphone
technology that produces a ground-biased analog
audio output from a single supply, which allows for dri-
ving the headphones directly from the amplifier outputs
without large DC-blocking capacitors. This feature
saves board space, provides higher click/pop suppres-
sion, and improves low-frequency (bass) response. The
architecture does not require the headphone jack to be
biased to a DC voltage and thus allows for a conven-
tional, grounded chassis design.
The MAX9850’s flexible clocking circuitry utilizes any
available system clock up to 40MHz, eliminating the
need for an external PLL and multiple crystal oscillators.
The DAC supports a wide range of sample rates from
8kHz to 48kHz in both master and slave modes, making
the MAX9850 the easiest to use and most versatile audio
DAC available. It can also be operated like traditional
synchronous DACs, at any integer-oversampling ratio.
The audio DAC receives input data over a flexible
3-wire interface that supports left-justified, right-justified
audio data, or I
line inputs are provided to either mix analog audio with
the digital input stream, or to drive the headphone out-
puts directly. Mode settings, headphone amplifier vol-
ume controls, and shutdown for both the headphone
and line outputs are programmed through a 2-wire,
I
The MAX9850 is fully specified over the -40°C to +85°C
extended temperature range and is available in a low-
profile, 28-pin thin QFN package (5mm x 5mm x 0.8mm).
19-3454; Rev 3; 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.
2
C-compatible interface.
MP3/Portable Multimedia Players
Cell Phones/Smart Phones
Portable DVD Players
2
S-compatible audio data. Stereo audio
________________________________________________________________ Maxim Integrated Products
General Description
Stereo Audio DAC with DirectDrive
Applications
♦ 1.8V to 3.6V Single-Supply Operation
♦ 30mW Stereo Headphone Output Power with
♦ DirectDrive Outputs Eliminate DC-Blocking
♦ 91dB PSRR at 1kHz
♦ Any Master Clock Up to 40MHz
♦ Flexible I
♦ I
♦ Stereo Line Inputs and Outputs
♦ Clickless/Popless Operation
♦ 2-Wire (I
♦ Available in 28-Pin Thin QFN Package
**EP = Exposed pad.
+Denotes lead-free package.
Pin Configuration appears at end of data sheet.
MAX9850ETI+ -40°C to +85°C
LRCLK
BCLK
SDIN
GPIO
1.8V Supply
Capacitors
SDA
ADD
SCL
2
Headphone Amplifier
PART
C Headphone Volume and Mute Control
DIGITAL
DIGITAL
2
MCLK
AUDIO
2
PLL
C)-Compatible Control Interface
I
2
S-Compatible Digital Audio Interface
C
TEMP RANGE
1.8V TO 3.6V
MAX9850
DAC
DAC
Ordering Information
+
+
INR
INL
PIN-PACKAGE
28 TQFN-EP**
Block Diagram
OUTR
OUTL
HPR
HPL
Features
LINE
OUT
LINE
OUT
T2855-6
CODE
PKG
1

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MAX9850ETI+T Summary of contents

Page 1

... QFN package (5mm x 5mm x 0.8mm). MP3/Portable Multimedia Players Cell Phones/Smart Phones Portable DVD Players ________________________________________________________________ Maxim Integrated Products 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. Headphone Amplifier ♦ 1.8V to 3.6V Single-Supply Operation ♦ ...

Page 2

Stereo Audio DAC with DirectDrive Headphone Amplifier ABSOLUTE MAXIMUM RATINGS (Voltages with respect to AGND ..................................................-0. Referenced to PV ....................................-0.3V to +0. ...............................................................-4V to ...

Page 3

Stereo Audio DAC with DirectDrive ELECTRICAL CHARACTERISTICS (continued) ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 32Ω to AGND, R LOAD_HP LOAD_OUT ...

Page 4

Stereo Audio DAC with DirectDrive Headphone Amplifier ELECTRICAL CHARACTERISTICS (continued) ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 32Ω to AGND, R ...

Page 5

Stereo Audio DAC with DirectDrive ELECTRICAL CHARACTERISTICS (continued) ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 32Ω to AGND, R LOAD_HP LOAD_OUT ...

Page 6

Stereo Audio DAC with DirectDrive Headphone Amplifier TIMING CHARACTERISTICS ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 32Ω to AGND, R LOAD_HP ...

Page 7

Stereo Audio DAC with DirectDrive Note 5: DAC SNR measured from DAC inputs to OUTL and OUTR. Note 6: Headphone amplifier SNR measured from line inputs to headphone outputs. Note 7: GPIO is 100kΩ to ground when DV Note 8: ...

Page 8

Stereo Audio DAC with DirectDrive Headphone Amplifier ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 12.288MHz, master integer mode, headphone volume set ...

Page 9

Stereo Audio DAC with DirectDrive ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 12.288MHz, master integer mode, headphone volume set to +6dB, ...

Page 10

Stereo Audio DAC with DirectDrive Headphone Amplifier ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 12.288MHz, master integer mode, headphone volume set ...

Page 11

Stereo Audio DAC with DirectDrive ( 3.0V, AGND = DGND = PGND = 0V 0.47µ 2.2µ 12.288MHz, master integer mode, headphone volume set to +6dB, ...

Page 12

Stereo Audio DAC with DirectDrive Headphone Amplifier PIN NAME Digital Audio Left-Right Clock Input/Output. LRCLK is the audio sample rate clock and determines 1 LRCLK whether the audio data on SDIN is routed to the left or right channel. LRCLK ...

Page 13

Stereo Audio DAC with DirectDrive Functional Diagram/Typical Operating Circuit ______________________________________________________________________________________ Headphone Amplifier 13 ...

Page 14

Stereo Audio DAC with DirectDrive Headphone Amplifier Detailed Description The MAX9850 audio digital-to-analog converter (DAC) with a stereo DirectDrive headphone amplifier is a com- plete digital audio playback solution. The sigma-delta DAC has 90dB of dynamic range and accepts stereo ...

Page 15

Stereo Audio DAC with DirectDrive 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 VOL(5:0) CODE Figure 1. Headphone Amplifier Attenuation Profile requires only two small ceramic capacitors (0.47µF and ...

Page 16

Stereo Audio DAC with DirectDrive Headphone Amplifier DV DD SHDN* 100kΩ MAX9850 HPS *SHDN = 1 FOR THIS DIAGRAM Figure 2. Headphone Sense (HPS) Input control pin of a 3-wire headphone jack as shown in Figure 2. With no headphone ...

Page 17

Stereo Audio DAC with DirectDrive Table 4. Interrupt Enable Register (0x4) Events LCK (register 0x0, bit B5) sets when the internal PLL acquires or loses frequency lock SHPS (register 0x0, bit B4) sets after the headphone is inserted and the ...

Page 18

Stereo Audio DAC with DirectDrive Headphone Amplifier Table 5. Acceptable MCLK Frequency Ranges MINIMUM ICLK (MHz) LRCLK NONINTEGER (kHz) INTEGER MODE MODE (160 LRCLK (176 1.280 1.4080 11.025 1.764 1.9404 12 1.920 2.1120 16 ...

Page 19

Stereo Audio DAC with DirectDrive Slave modes of operation allow the MAX9850 to operate in any audio system where the LRCLK and BCLK must be supplied from an external source. When operating in slave mode, the MCLK supplied to the ...

Page 20

Stereo Audio DAC with DirectDrive Headphone Amplifier where ICLK frequency. f must be at least 176 x ICLK ICLK f for proper DAC operation. LRCLK f = LRCLK frequency. LRCLK N = decimal value of MSB(14:8) and LSB(7:0) ...

Page 21

Stereo Audio DAC with DirectDrive For example 12MHz and f MCLK CP(4:0) Table 8 shows recommended CP(4:0) values for typical MCLK frequencies. Registers and Bit Descriptions Eleven internal registers program and report ...

Page 22

Stereo Audio DAC with DirectDrive Headphone Amplifier Status Registers (0x0, 0x1) Table 10. Status A (0x0) Read-Only, Bit Descriptions ALERT SGPIO LCK SHPS VMN interrupt event has occurred interrupt ...

Page 23

Stereo Audio DAC with DirectDrive Table 11. Status B (0x1) Read-Only, Bit Descriptions SMONO SHP Mono Status (SMONO The headphone amplifier outputs are in mono mode The headphone ...

Page 24

Stereo Audio DAC with DirectDrive Headphone Amplifier Volume Register (0x2) Table 12. Volume (0x2) Read/Write, Bit Descriptions MUTE SLEW VOL(5:0) Mute Enable (MUTE Mute headphone outputs Unmute headphone outputs. Set MUTE ...

Page 25

Stereo Audio DAC with DirectDrive General-Purpose Register Table 14. General Purpose (0x3) Read/Write, Bit Descriptions GM(1:0) GPD DBDEL(1:0) GPIO Output Mode Control (GM(1:0 GPIO outputs low GPIO is high impedance. 10 ...

Page 26

Stereo Audio DAC with DirectDrive Headphone Amplifier Headphone Overcurrent Interrupt Enable (IIOH ALERT sets to 1 when either IOHL or IOHR set ALERT will not set when IOHL or IOHR set to 1. IIOH ...

Page 27

Stereo Audio DAC with DirectDrive Slew-Rate Control (SR(1:0 Headphone volume slews from code 0x00 to 0x28 in 63µs. Not recommended when ZDEN = Headphone volume slews from code 0x00 to 0x28 in 125ms ...

Page 28

Stereo Audio DAC with DirectDrive Headphone Amplifier Least Significant Bit First (LSF Accepts audio data LSB first Accepts audio data MSB first. 2 Set LSF = 0 to conform to the I S standard ...

Page 29

Stereo Audio DAC with DirectDrive DIGITAL AUDIO REGISTER (0xA) CONTENTS = 00001000 LEFT LRCLK SDIN BCLK LEFT-JUSTIFIED DIGITAL AUDIO REGISTER ...

Page 30

Stereo Audio DAC with DirectDrive Headphone Amplifier S Sr SCL SDA Figure 6. START, STOP, and REPEATED START Conditions START CONDITION SCL 1 2 NOT ACKNOWLEDGE SDA Figure 7. Acknowledge Start and Stop Conditions SDA and SCL idle high when ...

Page 31

Stereo Audio DAC with DirectDrive A write to the MAX9850 includes transmission of a START condition, the slave address with the R/W bit set to 0 (see Table 23), one byte of data to configure the internal register address pointer, ...

Page 32

Stereo Audio DAC with DirectDrive Headphone Amplifier ACKNOWLEDGE FROM MAX9850 ACKNOWLEDGE FROM MAX9850 S SLAVE ADDRESS 0 A R/W Figure 10. Reading One Byte of Data from MAX9850 ACKNOWLEDGE FROM MAX9850 ACKNOWLEDGE FROM MAX9850 S SLAVE ADDRESS 0 A REGISTER ...

Page 33

Stereo Audio DAC with DirectDrive 1μF DV SCL μC SDA REF 1μF C1P 0.47μF C1N MCLK DIGITAL SDIN AUDIO SOURCE BCLK LRCLK PV SS 2.2μF Figure 12. Stereo Speakerphone The DAC begins its soft-start routine after being enabled and after ...

Page 34

Stereo Audio DAC with DirectDrive Headphone Amplifier 1μF 1μF 0.47μ INL BASEBAND 0.47μF IC INR SCL SDA APPLICATIONS MCLK PROCESSOR SDIN BCLK LRCLK 2.2μF Figure 13. Cell Phone Audio Cell Phone Audio The MAX9850 ...

Page 35

Stereo Audio DAC with DirectDrive Pin Configuration TOP VIEW C1N 23 PGND 24 C1P 25 MAX9850 SCL SDA TQFN ...

Page 36

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 36 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Package Information ...

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