SiTime SiT6098EBB User manual

SiT6098EBB Manual Rev. 1.2
Page 1 of 10
www.sitime.com
SiT6098EBB Evaluation Board User Manual
for 1-Hz to 2.5-MHz Oscillators and TCXOs in 1508 CSP:
SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
Contents
1 Introduction .............................................................................................................................................2
2 Board Information.................................................................................................................................... 2
3 Connectors............................................................................................................................................... 2
3.1 DUT Power .......................................................................................................................................2
3.2 Buffered Clock Output .....................................................................................................................2
3.3 Clock Output (Direct) .......................................................................................................................3
3.4 DUT Current Consumption Measurement.......................................................................................3
4 Application Notes.....................................................................................................................................3
4.1 Configurations..................................................................................................................................3
4.2 General Configuration...................................................................................................................... 3
4.2.1 Configuration 1: DC-Coupled Output ....................................................................................4
4.2.2 Configuration 2: AC-Coupled Output ....................................................................................5
4.2.3 Configuration 4: Direct Output with Additional Load Capacitor...........................................5
4.2.4 Configuration 5: DUT Power Supply Filter............................................................................. 6
4.2.5 Measuring Current Consumption.......................................................................................... 6
Appendix A....................................................................................................................................................8
The SiT6098EBB evaluation board supports 1-Hz to 2.5-MHz oscillators in a 1.5 x 0.8 mm CSP package
including the following products:
Base Part Number
Type
Output Frequency
Package
SiT1532
µPower Oscillator
32.768 kHz
1.5 x 0.8 CSP
SiT1572
Low-Jitter Oscillator
32.768 kHz
1.5 x 0.8 CSP
SiT1552
±5 to ±20-ppm TCXO
32.768 kHz
1.5 x 0.8 CSP
SiT1566
±3 to ±5-ppm TCXO
32.768 kHz
1.5 x 0.8 CSP
SiT1568
±5-ppm TCXO with calibration
32.768 kHz
1.5 x 0.8 CSP
SiT1534
µPower Oscillator
1 Hz to 32.768 kHz
1.5 x 0.8 CSP*
SiT1569
Low-Power Oscillator
1 Hz to 462.5 kHz
1.5 x 0.8 CSP
SiT1576
Low-Jitter TCXO
1 Hz to 2.5 MHz
1.5 x 0.8 CSP
SiT1579
Low-Jitter Oscillator
1 Hz to 2.5 MHz
1.5 x 0.8 CSP
*SiT1534 is also available in a 2.0 x 1.2 package. See SiT6096EBB for 2012 support.

SiT6098EBB Manual Rev. 1.2
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SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
1Introduction
The SiT6098EBB evaluation board (EVB) provides the ability to evaluate the functionality of SiTime’s 32-
kHz 1508 oscillators and TCXOs on a simple board that makes it easy to power up the oscillator and
observe the output buffered through an operational amplifier. The analog buffer isolates the device
from the significant loading, which is important for performing the best waveform and current
measurements.
2Board Information
A PCB view of the SiT6098EBB board with component reference designator call-outs is shown in
Figure A2 (SiT6098EBB layout).
3Connectors
Table 1. Connector’s Overview: Digi-Key p/n
Designator
Purpose
Digi-Key P/N for
Mating Connector
J2
DUT power
WM2613-ND
J3
Buffer power
WM2626-ND
J4
DUT consumption current measurement
WM2613-ND
Crimps for J2, J3, J4
WM6685CT-ND, 7pcs
J6
Direct output
H2011-ND
Crimps for J6
H9999-ND, 2pcs
J1
Buffer output
A97594-ND
Note: Pin-1 orientation of the chip is defined by a chamfer and dot in the silkscreen pattern.
3.1 DUT Power
Evaluation boards have input two-pin connector J2 for power supply. Pins polarities are identified on the
silkscreen pattern near connector.
3.2 Buffered Clock Output
This EVB uses an operational amplifier to buffer the oscillator clock output to make it easy to connect to
test and measurement equipment through SMA cables without loading the ultra-low power clock
output driver. The ADA4817-1 FET operational amplifier is used in a unity-gain buffer configuration. It is
a unity-gain stable, ultra-high speed, voltage feedback amplifier with FET inputs.
The three-pin connector J3 is intended for supplying the VDD power to the on-board operational
amplifier. Pin polarities are identified on the silkscreen pattern near connector J3. The operational
amplifier requires a dual power supply and should be -3V for negative power rail (V-) and +8V for the
positive supply (V+).

SiT6098EBB Manual Rev. 1.2
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SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
Table 2. Buffer supply voltage:
Power Rail Name
Voltage
V+
+8V (max)
V-
-3V (min)
3.3 Clock Output (Direct)
The oscillator output is best observed through the buffered output path using a test probe placed on the
test point TP2 or through the SMA connector J1. The buffer can be bypassed and the output can be
directly observed thru J6 2mm pitch pin header connector or using test point TP1 (see Figure A1 –
Figure A2 of Appendix A for test points arrangement on the board).
Section 4.1 shows recommended measurement configurations. When probing the oscillator output
directly, the probe loading can affect the output waveform and power consumption of the device.
SiTime recommends active probes with 10-MΩ and 1-pF impedance.
3.4 DUT Current Consumption Measurement
Two-pin connector J4 enables measuring the current consumption. To measure the current properly,
remove zero-ohm resistor R3, and connect the DMM or other current measuring device across this
connector.
4Application Notes
4.1 Configurations
The SiT6098EBB board supports multiple configurations for evaluating AC and DC coupled output modes
of the SiTime oscillator. In addition, this EVB provides the ability to add additional load capacitance and
to bypass the output buffer. Figure A1 in Appendix A shows the schematic of SiT6098EBB. Components
labeled “DNP” are not assembled. Components which are common to all listed below configurations
have nominal values assigned to them.
4.2 General Configuration
Figure 1 shows general shipment configuration.

SiT6098EBB Manual Rev. 1.2
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SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
Figure 1. General EVB configuration
4.2.1 Configuration 1: DC-Coupled Output
This configuration is intended for observing a DC coupled output through an oscilloscope through the
buffered output at SMA (J1) connector or test point (TP2) (see Figure A1 –Figure A2 of Appendix A for
test point locations on the board). Figure 2 shows the circuit for this configuration.
Figure 2. DC-coupled output configuration

SiT6098EBB Manual Rev. 1.2
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SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
4.2.2 Configuration 2: AC-Coupled Output
This configuration is intended for observing an AC-coupled output through an oscilloscope through the
buffered output at SMA (J1) connector or buffer output test point (TP2) (see Figure A1 –Figure A2 of
Appendix A for test point locations on the board). A 0.1-µF capacitor is placed in the clock output signal
path. Figure 3 shows the circuit for this configuration.
Figure 3. AC-coupled output configuration
4.2.3 Configuration 4: Direct Output with Additional Load Capacitor
This configuration is intended for observing direct oscillator output with a passive high input impedance
(> 1 MΩ || < 1 pf) scope probe at test point TP1 (see Figure A1 –Figure A2 of Appendix A for test points
on the board) or to connect the oscillator output to the end user system using 2-mm pitch header
connector J6 with an optional user defined load capacitor C2. Figure 4 shows the circuit for this
configuration.
Figure 4. Circuit for observing direct oscillator output

SiT6098EBB Manual Rev. 1.2
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SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
4.2.4 Configuration 5: DUT Power Supply Filter
This configuration is intended for providing power-supply filtering for the oscillator by soldering user-
defined capacitor C1. Figure 5 shows the circuit for this configuration. Power-supply filtering for the
device under test (DUT) is not required in common use cases. It should be used only if power supply
noise is significant or to cancel parasitic inductance effect of long wires from the power supply to EVB.
Figure 5. Circuit for providing DUT power filter
4.2.5 Measuring Current Consumption
When measuring supply current, simply remove jumper resistor R3 across 2-pin connector J4. Figure
6 shows the circuit for this configuration and connection of a precision DMM, e.g. Agilent U1242A to
connector J4. Figure 7 shows the setup for measuring supply current.
Figure 6. DUT supply current measurement

SiT6098EBB Manual Rev. 1.2
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SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
Figure 7. Setup for measuring IDD
IDD = 1.03 µA
under load
R3
removed

SiT6098EBB Manual Rev. 1.2
Page 8 of 10
www.sitime.com
SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz
Oscillators and TCXOs in 1508 CSP: SiT1532/34, SiT1552,
SiT1566/68/69, SiT1572/76/79
Appendix A
A1: Board Schematic
Figure A1. SiT6098EBB schematic

SiT6098EBB Manual Rev. 1.2
Page 9 of 10
www.sitime.com
SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
A2: Board Layout
Figure A2. SiT6098EBB layout
Buffer power
connector
DUT current
measurement
connector
DUT power
connector
Buffer output
connector
Direct output
connector
Posts for scope
GND clip
Buffer output
test point
Optional power
filter capacitor
Optional load
capacitor
Direct out
test point
Current measurement
jumper resistor
AC/DC coupling
capacitor/resistor

SiT6098EBB Manual Rev. 1.2
Page 10 of 10
www.sitime.com
SiT6098EBB Evaluation Board User Manual for 1-Hz to 2.5-MHz Oscillators
and TCXOs in 1508 CSP: SiT1532/34, SiT1552, SiT1566/68/69, SiT1572/76/79
Table 3. Revision History
Version
Release Date
Change Summary
1.2
09/11/2019
Addition of SiT1566/68/69, SiT1572/76/79. Edits for clarity.
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