DS1086L Dallas Semiconductor, DS1086L Datasheet - Page 8

• Manufacturer Part Number: DS1086L
• Description: Spread-Spectrum EconOscillator
• Manufacturer: Dallas Semiconductor

3.3V Spread-Spectrum EconOscillator
Figure 1. Clock Spectrum Dither Comparison
8
DITHERED 260kHz TO
_____________________________________________________________________
PIN
133MHz OUTPUT
DECOUPLING CAPACITORS
1
2
3
4
5
6
7
8
(0.1µF and 0.01µF)
V
CC
Processor-Controlled Mode
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
43
OUT
SPRD
V
GND
NAME
SPRD
CC
OUT
GND
PDN
SDA
V
SCL
OE
CC
(12OkHz BW, SAMPLE DETECT)
SPECTRUM COMPARISON
45
DS1086
8%
FREQUENCY (MHz)
Oscillator Output. The output frequency is determined by the OFFSET, DAC, and prescaler registers.
Dither Enable. When the pin is high, the dither is enabled. When the pin is low, the dither is disabled.
Power Supply
Ground
Output Enable. When the pin is high, the output buffer is enabled. When the pin is low, the output is
disabled but the master oscillator is still on.
Power-Down. When the pin is high, the master oscillator is enabled. When the pin is low, the master
oscillator is disabled (power-down mode).
2-Wire Serial Data. This pin is for serial data transfer to and from the device. The pin is open drain and
can be wire-ORed with other open-drain or open-collector interfaces.
2-Wire Serial Clock. This pin is used to clock data into the device on rising edges and clock data out on
falling edges.
2%
47
fo = 50MHz
DITHER RATE = fo/4096
0.5%
PDN
SCL
SDA
OE
49
4.7kΩ
V
V
CC
CC
51
NO
SPREAD
4.7kΩ
53
2-WIRE
INTERFACE
Figure 2. Temperature Variation Over Frequency
FUNCTION
*SDA AND SCL CAN BE CONNECTED DIRECTLY HIGH IF THE DS1086L NEVER NEEDS
TO BE PROGRAMMED IN-CIRCUIT, INCLUDING DURING PRODUCTION TESTING.
XTL1/OSC1
XTL2/OSC2
µP
-1%
-2%
-3%
-4%
-5%
3%
2%
1%
0
33
DITHERED 130kHz TO
66.6MHz OUTPUT
DECOUPLING CAPACITORS
MAXIMUM THERMAL VARIATION vs.
N.C.
MASTER OSCILLATOR FREQUENCY
36 39 42
(0.1µF and 0.01µF)
MASTER FREQUENCY (MHz)
V
CC
45
Stand-Alone Mode
OUT
SPRD
V
GND
CC
48 51 54
Pin Description
DS1086L
57
60
63
SCL*
SDA*
PDN
OE
66
V
CC