MAX9485 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Programmable Audio Clock Generator

19-3315; Rev 0; 7/04
Programmable ^{EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL} Audio Clock Generator
General Description
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_S) select-
ed through an I²C™ interface or hardwired inputs.
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.
Applications
Digital TVs
DVD Players
Set-Top Boxes
HDTVs
Home Entertainment
Centers
Features
♦ 27MHz Crystal with ±30ppm Frequency Reference
♦ Two Buffered Output Ports with Multiple Audio
Clocks: 256, 384, or 768 Times f_S
♦ Supports Standard and Double Sampling Rates
(12kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2 kHz,
and 96kHz)
♦ I²C Interface or Hardwired Output Clock Selection
♦ 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
Ordering Information
PART
MAX9485ETP
MAX9485EUP
*EP = Exposed pad.
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Thin QFN-EP*
20 TSSOP
I²C is a trademark of Philips Corp.
Purchase of I²C components of Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I²C Patent Rights to use these com-
ponents in an I²C system, provided that the system conforms
to the I²C Standard Specification as defined by Philips.
Pin Configurations
TOP VIEW
V_{DD_P} 1
GND_P 2
TUN 3
X1 4
X2 5
V_DD 6
SCL/FS0 7
SDA/FS1 8
FS2 9
GND 10
MAX9485
20 SAO2
19 SAO1
18 MCLK
17 V_DD
16 CLK_OUT2
15 GND
14 CLK_OUT1
13 MODE
12 RST
11 GND
TSSOP
TUN 1
X1 2
X2 3
V_DD 4
SCL/FS0 5
MAX9485
EXPOSED PAD
(GROUND)
15 V_DD
14 CLK_OUT2
13 GND
12 CLK_OUT1
11 MODE
THIN QFN
________________________________________________________________ Maxim Integrated Products 1
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