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DSC2132 Datasheet Preview

DSC2132 Datasheet

Low-Jitter I2C/SPI Programmable LVDS-LVPECL Oscillator

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DSC2132 DSC2232
Low-Jitter I2C/SPI Programmable LVDS-LVPECL Oscillator
General Description
The DSC2132 and DSC2232 series of
programmable, high-performance dual
oscillators utilizes a proven silicon MEMS
technology to provide excellent jitter and
stability while incorporating additional device
flexibility. DSC2132 and DSC2232 allow the
user to independently modify the frequency
of each output using I2C or SPI interface,
respectively. User can also select from two
pre-programmed default output frequencies
using the control pin.
DSC2132 and DSC2232 are packaged in 14-
pin 3.2x2.5 mm QFN packages and available
in temperature grades from Ext. Commercial
to Industrial.
Block Diagram
Features
Low RMS Phase Jitter: <1 ps (typ)
High Stability: ±50 ppm
Wide Temperature Range
o Industrial: -40° to 85° C
o Ext. commercial: -20° to 70° C
High Supply Noise Rejection: -50 dBc
Independent LVDS & LVPECL Outputs
I2C/SPI Programmable Frequencies
Wide Frequency Range:
o LVDS Output: 2.3 to 460 MHz
o LVPECL Output: 2.3 to 460 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
DSC2132 (I2C)
NC
SDA
SCL
CS_bar
DSC2232 (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
_____________________________________________________________________________________________________________________________ _________________
DSC2132 DSC2232
Page 1
MK-Q-B-P-D-12050108




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DSC2132 Datasheet Preview

DSC2132 Datasheet

Low-Jitter I2C/SPI Programmable LVDS-LVPECL Oscillator

No Preview Available !

DSC2132 DSC2232 Low-Jitter I2C/SPI Programmable LVDS-LVPECLOscillator
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+
Output1-
Output 2-
Output 2+
VDD2
VDD
FS
Pin Type
I
NA
NA
I
Power
I
I
O
I
I
O
O
O
O
Power
Power
I
Description
Enables outputs when high and disables when low
Leave unconnected or grounded
DSC2132: Leave unconnected or grounded
DSC2232: Serial clock from master
Ground
DSC2132: I2C Serial Data
DSC2232: SPI Serial Data from Master to Slave
DSC2132: I2C Serial Clock
DSC2232: SPI Serial Data from Slave to Master
DSC2132: I2C Chip Select (Active Low)
DSC2232: SPI Slave Select (Active Low)
Positive LVDS Output 1
Negative LVDSOutput 1
Negative LVPECL Output 2
Positive LVPECL Output 2
Power Supply for LVDS Output
Power Supply
Default output clock frequency bit
Operational Description
The DSC2132/2232 is a dual oscillator with an
LVPECL output and an LVDS output. The
device consists 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.
DSC2132/2232 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.
Programming details are provided in the
Programming Guide. Standard default
frequency pairs are described in the following
sections. Discera supports customer defined
versions of the DSC2132/22332.
When Enable (pin 1) is floated or connected to
VDD, the DSC2132/2232 is in operational
mode. Driving Enable to ground will tri-state
both output drivers (hi-impedance mode).
_____________________________________________________________________________________________________________________________ _________________
DSC2132 DSC2232
Page 2
MK-Q-B-P-D-12050108


Part Number DSC2132
Description Low-Jitter I2C/SPI Programmable LVDS-LVPECL Oscillator
Maker Micrel
Total Page 6 Pages
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