PRELIMINARY DATASHEET
VCXO PLUS AUDIO CLOCK FOR STB
Description
The IDT5V10007 is a low cost, low jitter, high performance
VCXO and PLL clock synthesizer designed to replace
expensive discrete VCXOs and multipliers. The patented
on-chip Voltage Controlled Crystal Oscillator accepts a 0 to
3.3 V input voltage to cause the output clocks to vary by
±115 ppm. Using IDT’s analog/digital Phase-Locked Loop
(PLL) techniques, the device uses an inexpensive 27 MHz
pullable crystal input to produce a reference output and a
selectable audio clock.
IDT manufactures the largest variety of VCXO based timing
devices for all applications. Consult IDT to eliminate
VCXOs, crystals, and oscillators from your board.
The frequency of the on-chip VCXO is adjusted by an
external control voltage connected to VIN. Because VIN is
a high impedance input, it can be driven directly from an
PWM RC integrator circuit.
IDT5V10007
Features
•
•
•
•
•
•
•
Packaged in 16-pin TSSOP
Available in Pb (lead) free package
Replaces a VCXO and oscillator
Operating voltage of 3.3V
Provides output of 27 MHz plus audio clock
Uses an inexpensive 27 MHz pullable crystal
On-chip patented VCXO with pull range of 230 ppm
(minimum)
•
VCXO tuning voltage of 0 to 3.3 V
•
Advanced, low power, sub-micron CMOS process
Block Diagram
VDD
3
S2:S0
VIN
X1
27 MHz
Pullable
Crystal
3
PLL/Clock
Synthesis
Circuitry
ACLK
X2
Voltage
Controlled
Crystal
Oscillator
3
27MHz
GND
PDTS
IDT™
VCXO PLUS AUDIO CLOCK FOR STB
1
IDT5V10007
REV C 071907
IDT5V10007
VCXO PLUS AUDIO CLOCK FOR STB
VCXO AND SYNTHESIZER
Pin Assignment
X2
X1
VD D
VD D
VIN
GND
GND
PD TS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
S1
NC
VD D
S0
27M
GND
AC LK
S2
Audio Clock Select Table
S2
0
0
0
0
1
1
1
1
S1
0
0
1
1
0
0
1
1
S0
0
1
0
1
0
1
0
1
ACLK (MHz)
8.192
11.2896
12.288
16.9344
18.432
16.384
22.5792
24.576
16 Pin 4.40m m body, 0.65m m pitch TSSO P
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
Name
X2
X1
VDD
VDD
VIN
GND
GND
PDTS
S2
ACLK
GND
27M
S0
VDD
NC
S1
Pin
Type
Output
Input
Power
Power
Input
Power
Power
Power
Input
Output
Power
Output
Input
Power
—
Input
Pin Description
Crystal connection. Connect to a 27 MHz fundamental mode pullable crystal.
Crystal connection. Connect to a 27 MHz fundamental mode pullable crystal.
Connect to +3.3 V.
Connect to +3.3 V.
Voltage input to VCXO. Zero to 3.3 V signal which controls the VCXO
frequency.
Connect to ground.
Connect to ground.
Power Down Tri-state. This pin powers down entire chip and tri-states the
outputs when low. Internal pull-up.
Select input S2. Selects ACLK per table above. Internal pull-up.
Audio clock output per table above.
Connect to ground.
27 MHz reference clock output.
Select input S0. Selects ACLK per table above. Internal pull-up.
Connect to +3.3 V.
No connect. Do not connect anything to this pin.
Select input S1. Selects ACLK per table above. Internal pull-up.
IDT™
VCXO PLUS AUDIO CLOCK FOR STB
2
IDT5V10007
REV C 071907
IDT5V10007
VCXO PLUS AUDIO CLOCK FOR STB
VCXO AND SYNTHESIZER
External Component Selection
The IDT5V10007 requires a minimum number of external
components for proper operation.
De coupling Capacitors
Decoupling capacitors of 0.01µF should be connected
between VDD and GND on pins 3 and 4, pins 6 and 7, and
pins 11 and 14 as close to the IDT5V10007 as possible. For
optimum device performance, the de coupling capacitors
should be mounted on the component side of the PCB.
Avoid the use of vias in the de coupling circuit.
capacitors, one between X1 and ground, and another
between X2 and ground. Stuffing of these capacitors on the
PCB is optional. 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 procedure for determining the value of these capacitors
can be found in application note MAN05.
Series Termination Resistor
When the PCB traces between the clock outputs and the
loads are 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
.
Quartz Crystal
The IDT5V10007 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 meeting IDT’s recommended
parameters must be used, and the layout guidelines
discussed in the following section must be followed.
See Application Note MAN05 for a full list of crystal
parameters.
The frequency of oscillation of a quartz crystal is determined
by its “cut” and by the load capacitors connected to it. The
IDT5V10007 incorporates on-chip variable load capacitors
that “pull” (change) the frequency of the crystal. The crystal
specified for use with the IDT5V10007 is designed to have
zero frequency error when the total of on-chip + stray
capacitance is 14pF.
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 IDT5V10007. There should be no via’s between the
crystal pins and the X1 and X2 device pins. There should be
no signal traces underneath or close to the crystal.
Crystal Tuning Load Capacitors
The crystal traces should include pads for small fixed
IDT™
VCXO PLUS AUDIO CLOCK FOR STB
3
IDT5V10007
REV C 071907
IDT5V10007
VCXO PLUS AUDIO CLOCK FOR STB
VCXO AND SYNTHESIZER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the IDT5V10007. These ratings, which
are standard values for IDT 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
Supply Voltage, VDD
All Inputs and Outputs
Ambient Operating Temperature
Storage Temperature
Soldering Temperature
5V
Rating
-0.5 V to VDD+0.5 V
0 to +70° C
-65 to +150° C
260° C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Reference crystal parameters
Min.
0
+3.15
Typ.
3.3
Max.
+70
+3.45
Units
°
C
V
Refer to page 3
DC Electrical Characteristics
VDD=3.3 V ±5%
, Ambient temperature 0 to +70° C, unless stated otherwise
Parameter
Operating Voltage
Output High Voltage
Output Low Voltage
Output High Voltage (CMOS Level)
Input High Voltage (S2:S1:S0)
Input Low Voltage (S2:S1:S0)
Operating Supply Current
Short Circuit Current
VIN, VCXO Control Voltage
On Chip Pull-up Resistor, inputs
Input Capacitance
Nominal Output Impedance
Symbol
VDD
V
OH
V
OL
V
OH
V
IH
V
IL
IDD
I
OS
V
IA
R
PU
C
IN
Z
OUT
Conditions
I
OH
= -12 mA
I
OL
= 12 mA
I
OH
= -4 mA
Min.
3.15
2.4
Typ.
3.3
Max.
3.45
0.4
Units
V
V
V
V
V
VDD-0.4
2.2
0.8
V
mA
mA
No load, 2
outputs
0
S0, S1, S2,PDTS
S0, S1, S2,PDTS
18
±50
3.3
600
5
20
V
kΩ
pF
Ω
AC Electrical Characteristics
IDT™
VCXO PLUS AUDIO CLOCK FOR STB
4
IDT5V10007
REV C 071907
IDT5V10007
VCXO PLUS AUDIO CLOCK FOR STB
VCXO AND SYNTHESIZER
VDD = 3.3 V ±5%
, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Crystal Pullability
VCXO Gain
Output Rise Time
Output Fall Time
Output Clock Duty Cycle
Maximum Output Jitter,
short term
t
OR
t
OF
t
D
t
J
Symbol
f
P
Conditions
0V< VIN < 3.3 V, Note 1
VIN = VDD/2 + 1 V, Note 1
0.8 to 2.0 V, C
L
=15 pF
2.0 to 0.8 V, C
L
=15 pF
Measured at 1.65 V, C
L
=15 pF
C
L
=15 pF
Min.
+ 100
Typ.
80
0.75
0.75
Max. Units
ppm
ppm/V
1.5
1.5
60
ns
ns
%
ps
40
50
+150
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3.
Thermal Characteristics
Parameter
Thermal Resistance Junction to
Ambient
Symbol
θ
JA
θ
JA
θ
JA
θ
JC
Conditions
Still air
1 m/s air flow
3 m/s air flow
Min.
Typ.
78
70
68
37
Max. Units
°
C/W
°
C/W
°
C/W
°
C/W
Thermal Resistance Junction to Case
Marking Diagram
16
9
IDT5V100
07PGG
YYWW
1
8
Notes:
1. YYWW is the last two digits of the year and week that the part was assembled.
2. “G” after the two-letter package code designates RoHS compliant package.
3. Bottom marking: country of origin if not USA.
IDT™
VCXO PLUS AUDIO CLOCK FOR STB
5
IDT5V10007
REV C 071907
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