ICS726TLF [ICSI]
12 TO 36 MHZ SOT-23 VCXO; 12 〜36 MHZ SOT- 23 VCXO
| 型号： | ICS726TLF |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | 12 TO 36 MHZ SOT-23 VCXO |
| 文件： | 总6页 (文件大小：119K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS726
12 TO 36 MHZ SOT-23 VCXO
Description
Features
Used in conjunction with an external pullable quartz
crystal, this monolithic integrated circuit replaces more
costly hybrid (canned) VCXO devices. The ICS726 is
designed primarily for data and clock recovery
applications such as ADSL modems, set-top box
receivers, and telecom systems.
• Uses an inexpensive 12 to 36 MHz external crystal
• Output frequency range of 12 to 36 MHz
• On-chip VCXO with guaranteed pull range of 115
ppm minimum
• VCXO tuning voltage 0 to 3.3 V
• Packaged in 6-pin TSOT-23-6
• Available in Pb (lead) free package
The frequency of the on-chip VCXO is adjusted by an
external control voltage to the VIN pin. Since VIN is a
high impedance input, it can be driven directly from an
PWM RC integrator circuit. Frequency output increases
with VIN voltage input. The usable range of VIN is 0 to
3.3 V.
Block Diagram
VDD
VIN
X1
Voltage
12-36MHz
Pullable
Crystal
Controlled
Crystal
Oscillator
12-36MHz
X2
GND
MDS 726 F
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Revision 112905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS726
12 TO 36 MHZ SOT-23 VCXO
Pin Assignment
X2
GND
CLK
6
5
4
1
2
3
X1
VI N
VDD
TSOT- 23- 6
Pin Descriptions
Pin
Pin
Pin
Type
Pin Description
Number Name
1
2
3
4
5
X2
Input
Crystal connection. Connect to the external pullable crystal.
GND
CLK
VDD
VIN
Power Connect to ground.
Output VCXO CMOS level clock output at the frequency of the crystal.
Power Connect to +3.3 V (0.01uf decoupling capacitor recommended).
Input
Voltage input to VCXO — 0 to 3.3 V analog input which controls the
oscillation frequency of the VCXO.
6
XI
Input
Crystal connection. Connect to the external pullable crystal.
MDS 726 F
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Revision 112905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS726
12 TO 36 MHZ SOT-23 VCXO
Required Crystal Parameters:
External Component Selection
Nominal Frequency
Initial Accuracy at 25°C
Temperature Stability
Aging, 1st year
as required MHz
-20 min/+20 max ppm
-30 min/+30 max ppm
-5 min/+5 max ppm
The ICS726 requires a minimum number of external
components for proper operation.
Decoupling Capacitor
Aging, 10 years
Operating Temp. Range, °C
or
-20 min/+20 max ppm
0 min/+25 typ/+70 max
A decoupling capacitor of 0.01µF must be connected
between VDD (pin 4) and GND (pin 2), as close to
these pins as possible. For optimum device
Operating Temp. Range, °C -40 min/+25 typ/+85 max
Load Capacitance
Shunt Capacitance, C0
C0/C1 Ratio
10 pf
7 pF Max
270 Max
35 Ω Max
performance, the decoupling capacitor should be
mounted on the component side of the PCB. Avoid the
use of vias in the decoupling circuit.
Equivalent Series Resistance
Series Termination Resistor
The third overtone mode of the crystal and all spurs
must be >100 ppm distant from the 3x fundamental
resonance measured with a physical load of 10 pF.
When the PCB trace between the clock output (CLK,
pin 3) and the load is over 1 inch, series termination
should be used. To series terminate a 50Ω trace (a
commonly used trace impedance) place a 33Ω resistor
in series with the clock line, as close to the clock output
pin as possible. The nominal impedance of the clock
output is 20Ω.
The external crystal must be connected as close to the
chip as possible and should be on the same side of the
PCB as the ICS726. There should be no vias between
the crystal pins and the X1 and X2 device pins. There
should be no signal traces underneath or close to the
crystal. See application note MAN05.
Quartz Crystal
The ICS726 VCXO function consists of the external
crystal and the integrated VCXO oscillator circuit. To
assure the best system performance (frequency pull
range) and reliability, a crystal device with the
recommended parameters (shown below) must be
used, and the layout guidelines discussed in the
following section shown must be followed.
Crystal Tuning Load Capacitors
The crystal traces should include pads for small fixed
capacitors, one between X1 and ground, and another
between X2 and ground. The need for these capacitors
is determined at system prototype evaluation, and is
influenced by the particular crystal used (manufacture
and frequency) and by PCB layout. The typical required
capacitor value is 1 to 4 pF.
The frequency of oscillation of a quartz crystal is
determined by its “cut” and by the load capacitors
connected to it. The ICS726 incorporates on-chip
variable load capacitors that “pull” (change) the
frequency of the crystal. The crystal specified for use
with the ICS726 is designed to have zero frequency
error when the total of on-chip + stray capacitance is 14
pF.
The procedure for determining the value of these
capacitors can be found in application note MAN05.
MDS 726 F
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Revision 112905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS726
12 TO 36 MHZ SOT-23 VCXO
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS726. These ratings, which
are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the
device at these or any other conditions above those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can
affect product reliability. Electrical parameters are guaranteed only over the recommended operating
temperature range.
Item
Rating
Supply Voltage, VDD
All Inputs and Outputs
7 V
-0.5 V to VDD+0.5 V
0 to +70°C
Ambient Operating Temperature
Storage Temperature
-65 to +150°C
260°C
Soldering Temperature
Recommended Operating Conditions
Parameter
Min.
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Reference crystal parameters
0
+3.15
+3.45
V
Refer to page 3
MDS 726 F
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Revision 112905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS726
12 TO 36 MHZ SOT-23 VCXO
DC Electrical Characteristics
VDD=3.3 V ±±% , Ambient temperature 0 to +70°C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
3.15
2.4
Typ.
Max.
Units
Operating Voltage
VDD
3.45
V
V
V
V
Output High Voltage
Output Low Voltage
V
I
I
I
= -12 mA
= 12 mA
= -4 mA
OH
OH
OL
OH
V
0.4
OL
Output High Voltage (CMOS
Level)
V
VDD-0.4
OH
Operating Supply Current
IDD
Output = 12 MHz,
no load
5
mA
Short Circuit Current
I
50
mA
V
OS
VIN, VCXO Control Voltage
V
0
3.3
IA
AC Electrical Characteristics
VDD = 3.3 V ±±%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Conditions
Min. Typ. Max. Units
Output Frequency
F
12
36
MHz
ppm
O
Crystal Pullability,
Note 2
F
0V< VIN < 3.3 V, Note 1
115
P
VCXO Gain
VIN = VDD/2 1 V, Note 1
140
0.8
0.8
50
ppm/V
ns
Output Rise Time
Output Fall Time
t
0.8 to 2.0 V, C =15 pF
1.5
1.5
60
OR
L
t
2.0 to 0.8 V, C =15 pF
ns
OF
L
Output Clock Duty
Cycle
t
Measured at 1.4 V, C =15 pF
40
%
D
L
Maximum Output
Jitter, short term
t
C =15 pF
100
ps
J
L
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3.
MDS 726 F
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Revision 112905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS726
12 TO 36 MHZ SOT-23 VCXO
Package Outline and Package Dimensions (6-pin TSOT-23-6)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Inches
Symbol
Min
Max
1.45
0.15
1.30
0.50
0.22
3.00
3.00
1.75
Min
Max
A
A1
A2
b
0.90
0
.0354
0
.0571
.0059
.0512
.0197
.0087
.1181
.1181
.0689
0.90
0.35
0.09
2.80
2.60
1.50
0.95 BASIC
1.90 BASIC
0.35 0.55
0.50 0.70
0.25 BASIC
.0354
.0138
.0036
.1102
.1024
.0591
c
D
E
E1
e
e1
L
L1
L2
0.0374 BASIC
0.0748 BASIC
.0138
.0197
.0098 BASIC
.0217
.0276
0°
10°
0°
10°
θ
aaa
—
0.10
—
.0039
Ordering Information
Part / Order Number
ICS726T
Marking
726
Shipping Packaging
Tubes
Package
Temperature
0 to +70° C
0 to +70° C
0 to +70° C
0 to +70° C
6-pin TSOT-23-6
6-pin TSOT-23-6
6-pin TSOT-23-6
6-pin TSOT-23-6
ICS726TT
ICS726TLF
ICS726TLFT
726
726
726
Tape and Reel
Tubes
Tape and Reel
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS)
assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would
result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial
applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary
environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any
circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or
critical medical instruments.
MDS 726 F
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Revision 112905
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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