MAX9485ETP Maxim Integrated Products, MAX9485ETP Datasheet

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MAX9485ETP

Manufacturer Part Number
MAX9485ETP
Description
Clock Generators & Support Products Programmable Audio C lock Generator Gener
Manufacturer
Maxim Integrated Products
Datasheet
The MAX9485 programmable multiple-output clock
generator provides a cost-efficient solution for MPEG-2
audio systems such as DVD players, DVD drives for
multimedia PCs, digital HDTV systems, home entertain-
ment centers, and set-top boxes.
The MAX9485 accepts an input reference frequency of
27MHz from a crystal or system reference clock. The
device provides two buffered clock outputs of 256, 384,
or 768 times the chosen sampling frequency (f
ed through an I
Sampling frequencies of 12kHz, 32kHz, 44.1kHz,
48kHz, 64kHz, 88.2kHz, or 96kHz are available. The
MAX9485 also offers a buffered 27MHz output and an
integrated voltage-controlled oscillator (VCXO) that is
tuned by a DC voltage generated from the MPEG
processor. The use of VCXO allows the audio system
clock to lock with the overall system clock.
The MAX9485 features the lowest jitter in its class, guar-
anteeing excellent dynamic performance with audio
ADCs and DACs in an MPEG-2 audio system. The
device operates with a 3.3V supply and is specified over
the -40°C to +85°C extended temperature range. The
MAX9485 is offered in 6.5mm x 4.4mm 20-pin TSSOP
and 4mm x 4mm 20-pin thin QFN packages.
19-3315; Rev 0; 7/04
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
Digital TVs
Set-Top Boxes
Home Entertainment
Centers
TOP VIEW
SDA/FS1
SCL/FS0
________________________________________________________________ Maxim Integrated Products
2
GND_P
V
C interface or hardwired inputs.
DD_P
GND
TUN
V
FS2
X1
X2
DD
General Description
10
1
2
3
4
5
6
7
8
9
Programmable Audio Clock Generator
MAX9485
TSSOP
DVD Players
HDTVs
Applications
20
19
18
17
16
15
14
13
12
11
SAO2
SAO1
MCLK
V
CLK_OUT2
GND
CLK_OUT1
MODE
RST
GND
DD
S
) select-
♦ 27MHz Crystal with ±30ppm Frequency Reference
♦ Two Buffered Output Ports with Multiple Audio
♦ Supports Standard and Double Sampling Rates
♦ I
♦ Separate Output Clock Enable
♦ Low Jitter Typical 21ps (RMS at 73.728MHz)
♦ No External Components for PLL
♦ Integrated VCXO with ±200ppm Tuning Range
♦ Small Footprint, Thin QFN Package, 4mm x 4mm
*EP = Exposed pad.
MAX9485ETP
MAX9485EUP
Clocks: 256, 384, or 768 Times f
(12kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2 kHz,
and 96kHz)
2
C Interface or Hardwired Output Clock Selection
PART
SCL/FS0
TUN
V
X1
X2
DD
1
2
3
4
5
EXPOSED PAD
Ordering Information
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
THIN QFN
MAX9485
(GROUND)
Pin Configurations
S
15
14
13
12
11
PIN-PACKAGE
20 Thin QFN-EP*
20 TSSOP
V
CLK_OUT2
GND
CLK_OUT1
MODE
DD
Features
1

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MAX9485ETP Summary of contents

Page 1

... S ♦ Separate Output Clock Enable ♦ Low Jitter Typical 21ps (RMS at 73.728MHz) ♦ No External Components for PLL ♦ Integrated VCXO with ±200ppm Tuning Range ♦ Small Footprint, Thin QFN Package, 4mm x 4mm PART MAX9485ETP MAX9485EUP *EP = Exposed pad. Applications 20 SAO2 19 SAO1 ...

Page 2

Programmable Audio Clock Generator ABSOLUTE MAXIMUM RATINGS GND ...............................................-0.3V to +4.0V DD, DD_P GND_P to GND ...................................................................±0.3V All Inputs and Outputs to GND...................-0. Short-Circuit Duration of Outputs to GND ..................Continuous Continuous Power Dissipation (T = ...

Page 3

Programmable Audio Clock Generator AC ELECTRICAL CHARACTERISTICS ( 3.0V to 3.6V -40°C to +85°C, output frequency is 73.728MHz DD_P A are +25° 3.3V.) (Note 3) ...

Page 4

Programmable Audio Clock Generator TIMING CHARACTERISTICS ( 3.0V to 3.6V -40°C to +85°C, unless otherwise noted. Typical values are DD_P A Figure 7.) (Note 1) PARAMETER Serial Clock Bus ...

Page 5

Programmable Audio Clock Generator ( 3.3V +25°C.) DD DD_P A SUPPLY CURRENT vs. LOAD CAPACITANCE 1.5V TUN f = 73.728MHz CLK_OUT ...

Page 6

Programmable Audio Clock Generator PIN NAME TSSOP TQFN PLL Power Supply. Bypass V DD_P 2 20 GND_P PLL Ground VCXO Tuning Voltage Input. Apply TUN to adjust the VCXO frequency. Connect 3 1 ...

Page 7

Programmable Audio Clock Generator V DD COUNTER N COUNTER M TUN X1 VCXO X2 MODE RESET RST Detailed Description The MAX9485 uses an input reference frequency of 27MHz from a crystal or system reference clock. The device provides two buffered ...

Page 8

Programmable Audio Clock Generator Table 1. Sampling Frequency and Output Clock SAMPLING FREQUENCY f (kHz) 256 x f (MHz 3.072 32 8.1920 44.1 11.2896 48 12.2880 64 16.3840 88.2 22.5792 96 24.5760 ACK PULSE HIGH t SDA ...

Page 9

Programmable Audio Clock Generator The internal power-on reset completes after 1024 cycles of the reference clock starting when V greater than 2.2V with a tolerance of ±0.4V. When using the internal power-on reset, RST must be high. Figure 3 shows ...

Page 10

Programmable Audio Clock Generator Table 5. Selection of Sampling Frequency FS0 SAMPLING FREQUENCY (kHz) Low 32 High 44.1 Open 48 Table 6. MCLK Enable/Disable Control SAO1 MCLK Low Disabled High Enabled Open Reserved Table 7. CLK_OUT Enable/Disable Control SAO1 SAO2 ...

Page 11

Programmable Audio Clock Generator Table 13. Frequency Scaling Factors C3 C2 OUTPUT SCALING FACTOR Table 14. Sampling Frequency Selection C1 C0 SAMPLING FREQUENCY (kHz ...

Page 12

Programmable Audio Clock Generator SDA t SU, DAT t LOW SCL t HIGH t HD, STA START CONDITION Figure 7. 2-Wire Serial Interface ( 80% 80% ...

Page 13

Programmable Audio Clock Generator Output CLK Frequency Setting A specific frequency could be achieved through multi- ple settings (Table 1) such as different sampling rate and multiplication factors (256, 384, and 768). However, due to the difference of internal structure, ...

Page 14

Programmable Audio Clock Generator INTERFACE TO SET AUDIO CLK RATE FILTERED PWM CONTROL VOLTAGE FOR VCXO TUN MAX9485 AUDIO CLK 27MHz GENERATOR CRYSTAL MCLK 27MHz AUDIO ENCODED DATA FROM DVD/HDD/BS-TUNER 14 ______________________________________________________________________________________ AUDIO CLK: 256/384/768f CLK_OUT1 S ...

Page 15

Programmable Audio Clock Generator (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.) ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, TSSOP 4.40mm BODY 1 21-0066 ...

Page 16

... 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. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Package Information (continued) Printed USA is a registered trademark of Maxim Integrated Products ...

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