DS1081LE/T+C01 Maxim Integrated Products, DS1081LE/T+C01 Datasheet - Page 4

• Manufacturer Part Number: DS1081LE/T+C01
• Description: Timers & Support Products Spread-Spectrum Cloc k Modulator for LCD
• Manufacturer: Maxim Integrated Products

Specifications of DS1081LE/T+C01

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The DS1081L modulates an input clock to generate a
center-dithered spread-spectrum output. A 20MHz to
134MHz clock is applied to the CLKIN pin. An internal
PLL dithers the output clock about its center frequency
at a user-selectable magnitude.
The DS1081L can generate dither magnitudes up to
±2%. The desired magnitude is selected using input pins
SMSEL1 and SMSEL2 as shown in Table 1.
20MHz to 134MHz Spread-Spectrum
Clock Modulator for LCD Panels
Table 1.
4
PIN
1
2
3
4
5
6
7
8
_____________________________________________________________________
SMSEL2
0
0
1
1
Spread-Spectrum Dither Magnitude
SMSEL2
SMSEL1
CRSEL
NAME
CLKIN
SSEN
GND
SSO
V
CC
Clock Input. 20MHz to 134MHz clock input (f
Spread-Spectrum Magnitude Select Inputs. These digital inputs select the desired spread-spectrum
magnitude as shown in the table below.
Ground
Spread-Spectrum Enable. Three-level input to enable/disable spread-spectrum and to tri-state the output.
0 = Power-up/spread-spectrum enabled.
Float = SSO tri-stated.
1 = Power-up/spread-spectrum disabled (not a bypass mode).
Spread-Spectrum Clock Output. Outputs a center-dithered spread-spectrum version of the clock input at
CLKIN.
Clock Range and Dither Rate Select. Three-level input that determines the dither rate. See the Detailed
Description section for details.
Supply Voltage
Detailed Description
SMSEL1
0
1
0
1
SMSEL2
CRSEL
Float
0
0
1
1
0
1
MAGNITUDE
±2.0%
±1.5%
±1.0%
±0.5%
66MHz to 134MHz
33MHz to 80MHz
20MHz to 38MHz
IN
The output spread-spectrum dither rate is determined
by the input frequency to maximize EMI reduction and
to ensure that the dither rate is always above the audio
frequency range. The user must configure CRSEL,
based on Table 2, depending on the input frequency
(f
Table 2.
CLKIN RANGE
IN
).
FUNCTION
SMSEL1
) so that the appropriate dither rate is programmed.
CRSEL
Float
0
1
0
1
0
1
66MHz to 134MHz
33MHz to 80MHz
20MHz to 38MHz
Spread-Spectrum Dither Rate
CLKIN RANGE
MAGNITUDE SELECTED
Pin Description
DITHER RATE
f
f
f
IN
IN
±2.0%
±1.5%
±1.0%
±0.5%
IN
/2048
/1024
/512
DITHER RATE
f
f
IN
IN
f
IN
/2048
/1024
/512