DSC2211FM2-T [MICREL]
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator;
| 型号： | DSC2211FM2-T |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator |
| 文件： | 总6页 (文件大小：567K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DSC2111 DSC2211
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
eet
General Description
Features
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.
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
DSC2111 and DSC2211 are packaged in 14-
pin 3.2x2.5 mm QFN packages and available
in temperature grades from Ext. Commercial
to Automotive.
Wide Frequency Range:
o CMOS Output: 2.3 to 170 MHz
Miniature Footprint of 3.2x2.5mm
Block Diagram
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
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
Pin # DSC2111 (I2C)
DSC2211 (SPI)
3
5
6
7
NC
SDA
SCL
SCLK
MOSI
MISO
SS
CS_bar
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DSC2111 DSC2211 Page 1 MK-Q-B-P-D-12050102
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
DSC2111 DSC2211
Pin Description
Pin No. Pin Name
Pin
Type
Description
Enables outputs when high and disables when low
Leave unconnected or grounded
DSC2111: Leave unconnected or grounded
DSC2211: Serial clock from master
1
2
Enable
NC
I
NA
NA
I
NC
3
SCLK
GND
SDA
MOSI
SCL
MISO
CS_bar
SS
4
5
Power Ground
I
DSC2111: I2C Serial Data
DSC2211: SPI Serial Data from Master to Slave
I
O
I
DSC2111: I2C Serial Clock
6
7
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
I
8
9
Output1
NC
O
NA
NA
O
10
11
12
13
14
NC
Output2
VDD2
VDD
FS
Power Power Supply for CMOS Output 2
Power Power Supply
I
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.
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).
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
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.
I2C/SPI pins.
provided in the Programming Guide.
Standard default frequency pairs are
Programming details are
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
described in the following sections. Discera
supports customer defined versions.
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
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
tf (ns) 2.5 2.4 2.4
2
1.8 1.6 1.3 1.3
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DSC2111 DSC2211 Page 2 MK-Q-B-P-D-12050102
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
DSC2111 DSC2211
Table 2 lists the standard default frequency configurations and the associated ordering information
to be used in conjunction with the ordering code. Customer defined combinations are available.
Table 2. Pre-programmed pin-selectable output frequency pairs
Select Bit [FS] – Default is [1]
Ordering
Info
Freq
(MHz)
0
1
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
27
24
25
E0001
E0002
E0004
E0005
E0006
E0007
E0008
EXXXX
125
106.25
25
100
100
75
24
24
75
25
0*
25
0*
27
74.175
37.0875
0*
13.5
24
40
0*
40
40
200
128
Contact factory for additional
configurations.
Frequency select bit are weakly tied high so if left unconnected the default setting will be [1] and
the device will output the associated frequency highlighted in Bold.
0* – denotes invalid selection, output frequency is not specified.
______________________________________________________________________________________________________________________________________________
DSC2111 DSC2211
Page 3
MK-Q-B-P-D-12050102
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
DSC2111 DSC2211
Absolute Maximum Ratings
Ordering Code
Temp Range
Item
Min
Max
Unit Condition
E: -20 to 70
I: -40 to 85
L: -40 to 105
M: -55 to 125
Prog Mode
1: I2C bus
2: SPI bus
Packing
T: Tape & Reel
: Tube
Supply Voltage
-0.3
+4.0
V
Input Voltage
Junction Temp
Storage Temp
Soldering Temp
-0.3 VDD+0.3
V
°C
°C
°C
V
-
-55
-
+150
+150
+260
DSC2 1 11 F I 2
xxxxx
T
40sec max.
ESD
HBM
MM
-
Package
F: 3.2x2.5mm
Stability
1: ±50ppm
2: ±25ppm
Freq (MHz)
See Freq. table
4000
400
CDM
1500
Note: 1000+ years of data retention on internal memory
Specifications (Unless specified otherwise: T=25° C)
Parameter
Supply Voltage1
Supply Voltage (Output2)1
Condition
Min.
2.25
1.65
Typ.
Max.
3.6
Unit
VDD
VDD2
IDD
V
V
3.6
Supply Current
EN pin low – outputs are disabled
21
32
23
mA
EN pin high – outputs are enabled
CL=15Ω, FO1=FO2 =125 MHz
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
Supply Current2
IDD
mA
±25
±50
Frequency Stability
Aging
Startup Time3
Δf
ppm
Δf
tSU
1 year @25°C
T=25°C
±5
5
ppm
ms
Input Logic Levels
Input logic high
Input logic low
VIH
VIL
0.75xVDD
-
-
V
0.25xVDD
Output Disable Time4
Output Enable Time
Pull-Up Resistor2
tDA
5
ns
ns
tEN
20
Pull-up exists on all digital IO
40
kΩ
CMOS Outputs
Output Logic Levels
Output logic high
Output logic low
Output Transition time4
Rise Time
VOH
VOL
0.9xVDD
-
-
V
I=±6mA
0.1xVDD
20% to 80%
CL=15pf
tR
tF
1.1
1.4
2
2
ns
Fall Time
Commercial/Industrial temp range
Automotive temp range
2.3
45
170
100
55
Frequency
f0
MHz
Output Duty Cycle
Period Jitter5
SYM
JPER
%
psRMS
FO1=FO2=125 MHz
3
200kHz to 20MHz @ 125MHz
100kHz to 20MHz @ 125MHz
12kHz to 20MHz @ 125MHz
0.3
0.38
1.7
Integrated Phase Noise
JCC
psRMS
2
Notes:
1.
Pin 4 VDD should be filtered with 0.01uf capacitor.
2.
3.
4.
5.
Output is enabled if Enable pad is floated or not connected.
tsu is time to 100PPM stable output frequency after VDD is applied and outputs are enabled.
Output Waveform and Test Circuit figures below define the parameters.
Period Jitter includes crosstalk from adjacent output.
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DSC2111 DSC2211 Page 4 MK-Q-B-P-D-12050102
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
DSC2111 DSC2211
Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V)
2.5
25MHz-CMOS
50MHz-CMOS
106MHz-CMOS
125MHz-CMOS
2.0
1.5
1.0
0.5
0.0
0
200
400
600
800
1000
Low-end of integration BW: x kHz to 20 MHz
CMOS Phase jitter (integrated phase noise)
Output Waveform: CMOS
tR
tF
VOH
Output
VOL
tEN
1/fo
tDA
VIH
Enable
VIL
______________________________________________________________________________________________________________________________________________
DSC2111 DSC2211 Page 5 MK-Q-B-P-D-12050102
Low-Jitter I2C/SPI Programmable Dual CMOS Oscillator
DSC2111 DSC2211
Solder Reflow Profile
20-40
Sec
260°C
MSL 1 @ 260°C refer to JSTD-020C
Ramp-Up Rate (200°C to Peak Temp) 3°C/Sec Max.
217°C
200°C
60-150
Sec
Preheat Time 150°C to 200°C
Time maintained above 217°C
Peak Temperature
Time within 5°C of actual Peak
Ramp-Down Rate
60-180 Sec
60-150 Sec
255-260°C
20-40 Sec
6°C/Sec Max.
8 min Max.
Reflow
60-180
Sec
150°C
Cool
Pre heat
25°C
Time 25°C to Peak Temperature
Time
8 min max
Package Dimensions
3.2 x 2.5 mm 14 Lead Plastic Package
Disclaimer:
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information
is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and
descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted
by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims
any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the
body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or
sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any
damages resulting from such use or sale.
MICREL, Inc.
Phone: +1 (408) 944-0800
●
●
2180 Fortune Drive,
Fax: +1 (408) 474-1000
San Jose, California
95131
●
●
USA
●
Email: hbwhelp@micrel.com
www.micrel.com
______________________________________________________________________________________________________________________________________________
DSC2111 DSC2211 Page 6 MK-Q-B-P-D-12050102
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