SiTime SiT6098EBB Manuel utilisateur

SiTime Corporation 1 SiT6098EBB User Manual

SiT6098EBB Manual Rev. 1.2

April 2015

SiT6098EBB Evaluation Board User Manual for

1 Hz - 32 kHz Oscillator and TCXO in CSP:

SiT1532/4, SiT1552

SiT6098EBB Evaluation Board Introduction.......................................................................................... 1

Board Information .................................................................................................................................. 1

Connectors............................................................................................................................................. 2

3.1

DUT Power.................................................................................................................................... 2

3.2

Buffered Clock Output ................................................................................................................... 2

3.3

Clock Output (Direct)..................................................................................................................... 2

3.4

DUT Current Consumption Measurement .................................................................................... 3

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 ........................................................................................4

4.2.3

Configuration 4: Direct Output with Additional Load Capacitor.................................................5

4.2.4

Configuration 5: DUT Power Supply Filter ................................................................................ 5

4.2.5

Measuring SiT1532/4, SiT1552 Current Consumption ............................................................. 6

Appendix A .................................................................................................................................................... 7

A1: Board Schematic .................................................................................................................................... 7

This evaluation board supports the following products.

SiT1532: 32.768 kHz oscillator in 1.5 x 0.8 mm CSP package

SiT1534: 1 Hz to 32.768 kHz oscillator in 1.5 x 0.8 mm CSP package

SiT1552: 32.768 kHz TCXO in 1.5 x 0.8 mm CSP package

SiT6098EBB Evaluation Board Introduction

The SiT6098EBB evaluation board provides the ability to evaluate the functionality of the 32 kHz

oscillators 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 best waveform and current measurements.

The SiT6098EBB supports the following package size: 1.5 x 0.8 mm CSP

Board Information

A PCB view of the SiT6098EBB board with component reference designator call out is shown in

Figure A2 (SiT6098EBB layout).

Downloaded from Arrow.com.

SiTime Corporation 2 SiT6098EBB User Manual

SiT6096EBB Evaluation Board User Manual

3 Connectors

Overview:

Designator

Purpose

J2 DUT Power

J3 Buffer Power

J1 Buffer output

J6 Direct output

J4 DUT Consumption Current measurement

Mating connectors:

Designator

Mating connector

(

Digi

Key Part Number

J2 WM2613-ND

J3 WM2626-ND

J4 WM2613-ND

Crimps for J2, J3, J4 WM6685CT-ND, 7pcs

J6 H2011-ND

Crimps for J6 H9999-ND, 2pcs

J1 A97594-ND

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+).

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 Figures A2-A3 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 MΩand 1pF

impedance.

Downloaded from Arrow.com.Downloaded from Arrow.com.

SiTime Corporation 3 SiT6098EBB User Manual

SiT6096EBB Evaluation Board User Manual

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.

4 Application Notes

4.1 Configurations

SiT6098EBB supports multiple configurations for evaluating AC and DC coupled output modes of SiTime

oscillator. In addition, this EVB provides the ability to add additional load capacitance and to bypass the

output buffer. Figure A1 (see Appendix A) shows the schematic of SiT6098EBB. Components labeled

“DNP” are not assembled. Components which are common to all listed bellow configurations have

nominal values assigned to them.

4.2 General Configuration

Figure 1 shows general shipment configuration.

Figure 1: General EVB configuration

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

SiTime Corporation 4 SiT6098EBB User Manual

SiT6096EBB Evaluation Board User Manual

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 Figures A1-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

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 Figures A1-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

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

SiTime Corporation 5 SiT6098EBB User Manual

SiT6096EBB Evaluation Board User Manual

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 Figures A1-A2 of Appendix A for test points on the

board) or to connect the oscillator output to 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

4.2.4 Configuration 5: DUT Power Supply Filter

This configuration is intended for providing power-supply bypass filtering for the oscillator by soldering

user-defined capacitor C1. Figure 5 shows circuit for this configuration. The DUT power-supply bypass

filtering is not required in common 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

GND

Current Measurement Connector

DUT Power Connector

4.7V MAX

DNP

VDUT

Optional DUT Power filter

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

SiTime Corporation 6 SiT6098EBB User Manual

SiT6096EBB Evaluation Board User Manual

4.2.5 Measuring Current Consumption

When measuring supply current, simply remove jumper resistor R3 across 2-pin connector J4. Figure 6

shows circuit for this configuration and connect 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

Figure 7: Setup for measuring IDD

Current Measurement Connector

DNP

R3 Desolder for

current measurement

VDUT

removed

IDD = 1.03 uA

under load

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

SiTime Corporation 7 SiT6098EBB User Manual

SiT6098EBB Manual Rev. 1.2

April 2015

Appendix A

A1: Board Schematic

Figure A1: SiT6098EBB schematic

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

SiTime Corporation 8 SiT6098EBB User Manual

SiT6098EBB Manual Rev. 1.2

April 2015

A2: Board Layout

Figure A2: SiT6098EBB layout

SiTime Corporation

990 Almanor Avenue

Sunnyvale, CA 94085, USA

Phone: 408-328-4400

http://www.sitime.com

assumes no responsibility or liability for any loss, damage or defect of a Product which is caused in whole or in part by (i) use of any

circuitry other than circuitry embodied in a SiTime product, (ii) misuse or abuse including static discharge, neglect or accident, (iii)

unauthorized modification or repairs which have been soldered or altered during assembly and are not capable of being tested by

SiTime under its normal test conditions, or (iv) improper installation, storage, handling, warehousing or transportation, or (v) being

subjected to unusual physical, thermal, or electrical stress.

Disclaimer: SiTime makes no warranty of any kind, express or implied, with regard to this material, and specifically disclaims any

and all express or implied warranties, either in fact or by operation of law, statutory or otherwise, including the implied warranties of

merchantability and fitness for use or a particular purpose, and any implied warranty arising from course of dealing or usage of

trade, as well as any common-law duties relating to accuracy or lack of negligence, with respect to this material, any SiTime product

and any product documentation. Products sold by SiTime are not suitable or intended to be used in a life support application or

component, to operate nuclear facilities, or in other mission critical applications where human life may be involved or at stake.

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

Direct out test

point

Optional power

filter capacitor

Current

measurement jumper

Optional load

capacitor

AC/DC coupling

capacitor/resistor

GND

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

Autres manuels pour SiT6098EBB

Ce manuel convient aux modèles suivants

Table des matières