UG364: SiTCXO1-EVB Evaluation Board
User's Guide
The Silicon Labs SiTCXO1-EVB (kit) is used to help evaluate Silicon Labs Jitter Attenu-
ator and
Network Synchronization products for Stratum 3/3E, IEEE 1588 and G.8262
SyncE applications. This board is often used with the Si5348 network synchronizer
clock as the reference input. This board can come with an option of one of two Rakon
TCXOs. U1, option 1 is Rakon's E6518LF 5 mm x 7 mm part (pictured below) and U2,
option2 is Rakon's smaller RPT5032A 3.2 mm x 5 mm part.
EVB FEATURES:
• Dual Footprint capable of two TCXO sizes.
• Power supply filtering
•
Simple single ended output
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1. Quick Start
1. Connect power 3.3V to J1, and note that start-up current could be on the order of 7-8 mA.
2. Connect SiOCXO1-EB output, J2, to the Si5348 REF clock input using the short SMA cable provided with the EVB kit.
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Quick Start
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2. Top Layer View of Board
Figure 2.1. Top Layer View of Board
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Top Layer View of Board
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3. Functional Description
The SiTCXO1-EB is used in conjunction with Silicon Labs precision timing devices to facilitate characterization. The SiTCXO1-EB was
designed to maximize output termination configurations as well as optional control voltage terminations. Resistors and capacitors are
0603, which makes it simple to remove and add various values. The SiTCXO1-EB bill of materials and PCB layouts are in Section
7. Bill of Materials and Section 6. Schematic.
The SiTCXO1-EB is intended to be a general use board for a 6-pin TCXO with 5.0 mm x 3.2 mm nominal package size, such as the
Rakon P/N RPT5032A. It can also be used with the 6-pin TCXO with 5.0 mm x 7 mm nominal package size, such as the Rakon P/N
E6518LF 12.8 MHz pictured below. See 6. Schematic for example measurements carried out using this TCXO.
Figure 3.1. SiTCXO1-EB Shown Populated with a TCXO
3.1 Power Supply
The
power
supply voltage and current requirements are listed in the manufacturers data sheet. A 3.3 V ±5% supply is required. Also,
note the TCXO initial current can be on the order of 7mA. Power supply filtering has been added to the evaluation board to minimize
spurious response.
3.2 Output Termination
In most applications simple R C termination is used, as seen with R3 and C4 in Figure 6.1 SiTCXO1-EB Schematic on page 7. This
is a resistor to optimize impedance matching and a capacitor to block dc. Modifications can be made as required.
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Functional Description
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4. Configuring the SiTCXO-EB
SiTCXO1-EB
Power Supply
Ref Input
Si5348-EVB
Frequency Counter
or other MTIE T
DEV
Instrument
Figure 4.1. SiTCXO1-EB Configured with Si5348 EVB
The connection between the SiTCXO-EB and Si5348 EVB should be kept as short as possible. It is recommended to use a UPS Power
Supply back-up for long term testing.
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Configuring the SiTCXO-EB
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5. SiTCXO1-EB Functionality Test
1. Connect power to J1 (3.3 V).
2. Connect SiTCXO1-EB Output, J2, to an oscilloscope (terminate into 50 Ω).
3. Verify that the red LED is illuminated, the current draw matches closely to the specs, and the output matches the TCXO’s data
sheet.
UG364: SiTCXO1-EVB Evaluation Board User's Guide
SiTCXO1-EB Functionality Test
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6. Schematic
Figure 6.1. SiTCXO1-EB Schematic
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Schematic
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7. Bill of Materials
Table 7.1. Bill of Materials
Qty Ref Value Rating Voltage Tol Type PCB Footprint Mfr PN Mfr
1 C1 10 µF 10 V ±10% TANT C3216 TA010TCM106KA Venkel
1 C2, C4 0.1 µF 10 V ±10% X7R C0603|C0603L C0603X7R100-104K Venkel
1 C3 100 pF 50 V ±20% C0G C0603 C0603C0G500-101M Venkel
1 C5 10 pF 50 V ±10% C0G C0603 C0603C0G500-100K Venkel
1 D1 Green 20 mA 3.4 V
SMT,
Chip
LED
LED-HSMX-C170 HSMQ-C170
Avago
Technolo-
gies
1 J1
CONN
TRBLK 2
TERM
BLK
CONN-1X2-TB 1729018
PHOENIX
CONTACT
1 J2 SMA SMA SMA-EDGE-3 142-0701-801
Johnson
Compo-
nents
1 R3 39.0 Ω 1/10 W ±1%
Thick
Film
R0603|R0603L ERJ-3EKF39R0V Panasonic
1 R4 17.4 kΩ 1/16 W ±1%
Thick
Film
R0603 CR0603-16W-1742F Venkel
1 U1 E6518LF
Stratum
3
3.3 TCXO OSC6N5X7-E6518LF E6518LF Rakon
Not Installed Components
2 R1, R2 1 k 1/10 W ±1%
Thick
Film
R0603 CR0603-10W-1001F Venkel
2
TP1,
TP2
Blue Loop TESTPOINT 151-205-RC Kobiconn
1 U2 RPT5032A TCXO
OSC6N3.2X5P0.8-
RPT5032A
RPT5032A Rakon
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Bill of Materials
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8. Layout
Figure 8.1. Primary Silkscreen
Figure 8.2. Primary Solder Mask
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Layout
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Figure 8.3. Primary Side
Figure 8.4. Secondary Side
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Layout
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Figure 8.5. Secondary Solder Mask
Figure 8.6. Primary Solder Paste
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Layout
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