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DSC2011 Datasheet(PDF) 2 Page - Micrel Semiconductor

Part # DSC2011
Description  Low-Jitter Configurable Dual CMOS Oscillator
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

DSC2011 Datasheet(HTML) 2 Page - Micrel Semiconductor

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______________________________________________________________________________________________________________________________________________
DSC2011
Page 2
MK-Q-B-P-D-12042602-2
DSC2011
Low-Jitter Configurable Dual CMOS Oscillator
Pin Description
Pin No. Pin Name Pin Type
Description
1
Enable
I
Enables outputs when high and disables when low
2
NC
NA
Leave unconnected or grounded
3
O2S0
I
Least significant bit for drive strength selection for Output 2
4
GND
Power
Ground
5
FS0
I
Least significant bit for frequency selection
6
FS1
I
Middle bit for frequency selection
7
FS2
I
Most significant bit for frequency selection
8
Output1
O
CMOS output 1
9
O1S0
I
Least significant bit for drive strength selection for output 1
10
O1S1
I
Most significant bit for drive strength selection for output 1
11
Output2
O
CMOS output 2
12
VDD2
Power
Power Supply for Output 2
13
VDD
Power
Power Supply
14
O2S1
I
Most significant bit for drive strength selection for output 2
Operational Description
The DSC2011 is a dual output CMOS oscillator
consisting of a MEMS resonator and a support
PLL IC. The two CMOS outputs are generated
through
independent
8-bit
programmable
dividers from the output of the internal PLL.
For temp ranges up to Industrial, two
constraints
are
imposed
on
the
output
frequencies: 1) f2=M x f1/N, where M and N
are even integers between 4 and 254, 2)
1.2GHz < N x f2 < 1.7GHz. Please consult
factory for acceptable frequency combinations
for other temp ranges.
The actual frequencies output by the DSC2011
are controlled by an internal pre-programmed
memory (OTP).
This memory stores all
coefficients required by the PLL for up to eight
different frequency combinations.
Three
control pins (FS0 – FS2) select the output
frequency combination.
Discera supports
customer defined versions of the DSC2011.
Standard frequency options are described in in
the following sections.
The DSC2011 has independent control of the
output voltage levels of the two outputs. The
high voltage level of Output 1 is equal to the
main supply voltage, VDD (pin 13).
VDD2
(pin 12) sets the high voltage level of Output
2. VDD2 must be equal to or less than VDD at
all times to insure proper operation.
VDD2
can be as low as 1.65V.
When Enable (pin 1) is floated or connected to
VDD, the DSC2011 is in operational mode.
Driving Enable to ground will tri-state both
output drivers (hi-impedance mode).
The DSC2011 has programmable output drive
strength for each output. Using two control
pins (OXS0-OXS1) for each output, the drive
strength can be independently adjusted to
match circuit board impedances to reduce
power supply noise, overshoot/undershoot
and EMI. Table 1 displays typical rise / fall
times for the output with a 15pf load
capacitance as a function of these control pins
at VDD=3.3V and room temperature.
Table 1. Rise/Fall times for drive strengths
Output Drive Strength Bits
[OXS1, OXS0] - Default [11]
00
01
10
11
tr (ns)
1.6
1.4
1.2
1.1
tf (ns)
2.4
2.2
1.5
1.4


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