ICS661GITR [ICSI]
Precision Audio Clock Source; Precision音频时钟源
| 型号： | ICS661GITR |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Precision Audio Clock Source |
| 文件： | 总6页 (文件大小：125K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS661
Precision Audio Clock Source
Description
Features
The ICS661 provides synchronous clock generation for
audio sampling clock rates derived from an MPEG
stream, or can be used as a standalone clock source
with a 27 MHz crystal. The device uses the latest PLL
technology to provide excellent phase noise and long
term jitter performance for superior synchronization
and S/N ratio.
• Packaged in 16-pin TSSOP
• Available in Pb (lead) fere package
• Clock or crystal input
• Low phase noise
• Low jitter
• Exact (0 ppm) multiplication ratios
• Reference clock output available
Please contact ICS if you have a requirement for an
input and output frequency not included here - we can
rapidly modify this product to meet special
requirements.
• Support for 256, 384, 512, and 768 times sampling
rate
Block Diagram
VDD (P2)
VDD (P3)
VDDO
VDDR
X2
REF
Crystal
Oscillator
X1/REFIN
SELIN
PLL Clock
CLK
Synthesis
S3:0
4
GND (P13)
GND (P6) GND (P5)
MDS 661 D
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Revision 111804
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS661
Precision Audio Clock Source
Pin Assignment
Output Clock Selection Table
Input
Frequency
Output
Frequency
(MHz)
S3
S2
S1
S0
X1/REFIN
VDD
VDD
S0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
X2
(MHz)
REF
VDDR
GND
SELIN
VDDO
S1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
8.192
11.2896
12.288
24.576
12.288
16.9344
18.432
36.864
16.384
22.5792
24.576
49.152
24.576
33.8688
36.864
73.728
GND
GND
S3
S2
CLK
16-pin 4.40 mil body, 0.50 mm pitch TSSOP
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
Connect this pin to a crystal or clock input
1
2
X1/REFIN
VDD
VDD
S0
Input
Power Power supply for crystal oscillator.
Power Power supply for PLL.
3
4
Input
Output frequency selection. Determines output frequency per table above. On chip pull-up.
5
GND
GND
S3
Power Connect to ground.
6
Power Ground for output stage.
7
Input
Input
Output frequency selection. Determines output frequency per table above. On chip pull-up.
Output frequency selection. Determines output frequency per table above. On chip pull-up.
8
S2
9
CLK
S1
Output Clock output.
10
11
12
13
14
15
16
Input
Output frequency selection. Determines output frequency per table above. On chip pull-up.
VDDO
SELIN
GND
VDDR
REF
X2
Power Power supply for output stage.
Input
Low for clock input, high for crystal. On chip pull-up.
Power Connect to ground.
Power Power supply for reference output. Ground to turn off REF.
Output Reference clock output.
Input
Connect this pin to a crystal. Leave open if using a clock input.
MDS 661 D
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Revision 111804
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS661
Precision Audio Clock Source
Application Information
adjust the stray capacitance of the board to match the
nominally required crystal load capacitance. To reduce
possible noise pickup, use very short PCB traces (and
no vias) been the crystal and device.
Series Termination Resistor
Clock output traces should use series termination. 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 value of the load capacitors can be roughly
determined by the formula C = 2(C - 6) where C is the
L
load capacitor connected to X1 and X2, and C is the
L
Decoupling Capacitors
specified value of the load capacitance for the crystal.
A typical crystal C is 18 pF, so C = 2(18 - 6) = 24 pF.
Because these capacitors adjust the stray capacitance
of the PCB, check the output frequency using your final
layout to see if the value of C should be changed.
L
As with any high performance mixed-signal IC, the
ICS661 must be isolated from system power supply
noise to perform optimally.
Decoupling capacitors of 0.01µF must be connected
between each VDD and the PCB ground plane. To
further guard against interfering system supply noise,
the ICS661 should use one common connection to the
PCB power plane as shown in the diagram on the next
page. The ferrite bead and bulk capacitor help reduce
lower frequency noise in the supply that can lead to
output clock phase modulation.
PCB Layout Recommendations
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
1) Each 0.01µF decoupling capacitor should be
mounted on the component side of the board as close
to the VDD pin as possible. No vias should be used
between decoupling capacitor and VDD pin. The PCB
trace to VDD pin should be kept as short as possible,
as should the PCB trace to the ground via. Distance of
the ferrite bead and bulk decoupling from the device is
less critical.
Recommended Power Supply Connection for
Optimal Device Performance
VDD Pin
Ferrite
Bead
Connection to 3.3V
VDD Pin
2) The external crystal should be mounted next to the
device with short traces. The X1 and X2 traces should
not be routed next to each other with minimum spaces,
instead they should be separated and away from other
traces.
Power Plane
Bulk Decoupling Capacitor
(such as 1 F Tantalum)
VDD Pin
3) To minimize EMI and obtain the best signal integrity,
the 33Ω series termination resistor should be placed
close to the clock output.
0.01 F Decoupling Capacitors
4) An optimum layout is one with all components on the
same side of the board, minimizing vias through other
signal layers (the ferrite bead and bulk decoupling
capacitor can be mounted on the back). Other signal
traces should be routed away from the ICS661. This
includes signal traces just underneath the device, or on
layers adjacent to the ground plane layer used by the
device.
All power supply pins must be connected to the same
voltage, except VDDR and VDDO may be connected to
a lower voltage in order to change the output level. If
the reference output is not used, ground VDDR.
Crystal Load Capacitors
If a crystal is used, the device crystal connections
should include pads for capacitors from X1 to ground
and from X2 to ground. These capacitors are used to
MDS 661 D
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Revision 111804
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS661
Precision Audio Clock Source
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS661. 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
5.5 V
-0.5 V to VDD+0.5 V
-40 to +85°C
-65 to +150°C
125°C
Ambient Operating Temperature
Storage Temperature
Junction Temperature
Soldering Temperature
260°C
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+85
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
-40
+3.0
+3.6
V
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 10%, Ambient Temperature -40 to +85°C
Parameter
Symbol
VDD
Conditions
Min.
3.0
1.8
1.8
2
Typ.
Max. Units
Operating Voltage
3.6
V
V
VDDO
VDDR
VDD
VDD
V
Input High Voltage
Input Low Voltage
V
V
IH
V
0.8
0.4
V
IL
Output High Voltage
Output High Voltage
Output Low Voltage
Supply Current
V
V
I
I
I
= -4 mA
= -20 mA
= 20 mA
VDD-0.4
2.4
V
OH
OH
OH
OH
OL
V
V
V
OL
IDD
No Load
25
65
20
7
mA
mA
Ω
Short Circuit Current
Nominal Output Impedance
Input Capacitance
I
Each output
OS
Z
OUT
Input pins
pF
kΩ
Internal Pull-up Resistor
120
MDS 661 D
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Revision 111804
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS661
Precision Audio Clock Source
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 10%, Ambient Temperature -40 to +85°C
Parameter
Crystal Frequency
Output Clock Rise Time
Output Clock Fall Time
Output Duty Cycle
Jitter, Short term
Symbol
Conditions
Min.
Typ.
Max. Units
27
28
1.5
1.5
55
MHz
ns
t
20% to 80%, 15 pF load
80% to 20%, 15 pF load
At VDD/2, 15 pF load
Reference clock off
OR
t
ns
OF
OD
t
45
49 to 51
175
%
ps p-p
ps p-p
Jitter, Short term
Reference clock on
175
Reference clock off; 10
us delay
Jitter, Long term
Jitter, Long term
300
300
ps p-p
ps p-p
dBc
Reference clock on; 10
us delay
Single Sideband Phase
Noise
Reference clock off; 10
kHz offset
-110
Single Sideband Phase
Noise
Reference clock on; 10
kHz offset
-110
0
dBc
Actual Mean Frequency
Error versus Target
ppm
Thermal Characteristics
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
θ
Still air
78
70
68
37
°C/W
°C/W
°C/W
°C/W
JA
JA
JA
JC
1 m/s air flow
3 m/s air flow
Thermal Resistance Junction to Case
MDS 661 D
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Revision 111804
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS661
Precision Audio Clock Source
Package Outline and Package Dimensions (16-pin TSSOP, 4.40 mm Body, 0.50 mm Pitch)
Package dimensions are kept current with JEDEC Publication No. 95, MO-153
16
Millimeters
Min Max
Inches
Max
Symbol
Min
--
A
A1
A2
b
--
1.20
0.15
1.05
0.30
0.20
5.1
0.047
0.006
0.041
0.012
0.05
0.80
0.19
0.09
4.90
0.002
0.032
0.007
E1
E
INDEX
AREA
C
D
E
0.0035 0.008
0.193 0.201
0.252 BASIC
0.169 0.177
0.0256 Basic
1
2
6.40 BASIC
4.30 4.50
0.65 Basic
E1
e
D
L
0.45
0°
0.75
8°
0.018
0°
0.030
8°
α
aaa
--
0.10
--
0.004
A
A2
A1
c
- C -
e
SEATING
PLANE
b
L
aaa C
Ordering Information
Part / Order Number
ICS661GI
Marking
ICS661GI
Shipping Packaging
Tubes
Package
Temperature
-40 to +85°C
-40 to +85°C
-40 to +85°C
-40 to +85°C
16-pin TSSOP
16-pin TSSOP
16-pin TSSOP
16-pin TSSOP
ICS661GITR
ICS661GI
661GILF
661GILF
Tape and Reel
Tubes
ICS661GILF
ICS661GILFTR
Tape and Reel
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 661 D
6
Revision 111804
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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