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DSC2111 Datasheet Preview

DSC2111 Datasheet

Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator

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DSC2111 DSC2211
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
Datasheet
General Description
The DSC2111 and DSC2211 series of
programmable, high-performance dual CMOS
oscillators utilizes a proven silicon MEMS
technology to provide excellent jitter and
stability while incorporating high output
frequency flexibility and drive strength
control. DSC2111 and DSC2211 allow the
user to independently modify the frequency
of each output and CMOS drive strength
using I2C or SPI interface, respectively. User
can also select from two pre-programmed
default output frequencies using the control
pin.
DSC2111 and DSC2211 are packaged in 14-
pin 3.2x2.5 mm QFN packages and available
in temperature grades from Ext. Commercial
to Automotive.
Block Diagram
Features
Low RMS Phase Jitter: <1 ps (typ)
High Stability: ±25, ±50 ppm
Wide Temperature Range
o Automotive: -55° to 125° C
o Ext. Industrial: -40° to 105° C
o Industrial: -40° to 85° C
o Ext. commercial: -20° to 70° C
High Supply Noise Rejection: -50 dBc
Two Independent CMOS Outputs
I2C/SPI Programmable Freq & Drive
Short Lead Times: 2 Weeks
Wide Frequency Range:
o CMOS Output: 2.3 to 170 MHz
Miniature Footprint of 3.2x2.5mm
Excellent Shock & Vibration Immunity
o Qualified to MIL-STD-883
High Reliability
o 20x better MTF than quartz oscillators
Supply Range of 2.25 to 3.6 V
Lead Free & RoHS Compliant
Pin #
3
5
6
7
DSC2111 (I2C)
NC
SDA
SCL
CS_bar
DSC2211 (SPI)
SCLK
MOSI
MISO
SS
Applications
Storage Area Networks
o SATA, SAS, Fibre Channel
Passive Optical Networks
o EPON, 10G-EPON, GPON, 10G-PON
Ethernet
o 1G, 10GBASE-T/KR/LR/SR, and FCoE
HD/SD/SDI Video & Surveillance
PCI Express
_____________________________________________________________________________________________________________________________ _________________
DSC2111 DSC2211
Page 1
MK-Q-B-P-D-12050102




Discera

DSC2111 Datasheet Preview

DSC2111 Datasheet

Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator

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DSC2111 DSC2211 Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
Enable
NC
NC
SCLK
GND
SDA
MOSI
SCL
MISO
CS_bar
SS
Output1
NC
NC
Output2
VDD2
VDD
FS
Pin
Type
I
NA
NA
I
Power
I
I
O
I
I
O
NA
NA
O
Power
Power
I
Description
Enables outputs when high and disables when low
Leave unconnected or grounded
DSC2111: Leave unconnected or grounded
DSC2211: Serial clock from master
Ground
DSC2111: I2C Serial Data
DSC2211: SPI Serial Data from Master to Slave
DSC2111: I2C Serial Clock
DSC2211: SPI Serial Data from Slave to Master
DSC2111: I2C Chip Select (Active Low)
DSC2211: SPI Slave Select (Active Low)
CMOS output 1
Leave unconnected or grounded
Leave unconnected or grounded
CMOS output 2
Power Supply for CMOS Output 2
Power Supply
Default output clock frequency bit
Operational Description
The DSC2111/2211 is a dual CMOS oscillator
consisting of a MEMS resonator and a support
PLL IC. The outputs are generated through
independent 8-bit programmable dividers from
the output of the internal PLL.
DSC2111/2211 allows for easy programming
of the output frequencies using I2C/SPI
interface. Upon power-up, the initial output
frequencies are controlled by an internal pre-
programmed memory (OTP). This memory
stores all coefficients required by the PLL for
two different default frequency pairs. The
control pin (FS) selects the initial pair. Once
the device is powered up, a new output
frequency pair can be programmed using
I2C/SPI pins. Programming details are
provided in the Programming Guide.
Standard default frequency pairs are
described in the following sections. Discera
supports customer defined versions.
The DSC2111/2211 has independent control
of the output voltage levels of the two
outputs. The high voltage level of Output 1 is
Output Clock Frequencies
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. VDD2 can be as low as 1.65V.
When Enable (pin 1) is floated or connected to
VDD, the DSC2111/2211 is in operational
mode. Driving Enable to ground will disable
both output drivers (hi-impedance mode).
The DSC2111/2211 has programmable output
drive strength, which can be controlled via
I2C/SPI. Table 1 displays typical rise / fall
times for the output with a 15pf load
capacitance as a function of these control bits
at VDD=3.3V and room temperature.
Table 1. Rise/Fall times for drive strengths
Output Drive Strength Bits
[OXS2, OXS1, OXS0] - Default [111]
X=1 for output1, and 2 for output2
000 001 010 011 100 101 110 111
tr (ns) 2.1 1.7 1.6 1.4 1.3 1.3 1.2 1.1
tf (ns) 2.5 2.4 2.4 2 1.8 1.6 1.3 1.3
_____________________________________________________________________________________________________________________________ _________________
DSC2111 DSC2211
Page 2
MK-Q-B-P-D-12050102


Part Number DSC2111
Description Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
Maker Discera
Total Page 6 Pages
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