商品详情

TCXO

ISSUE 7; 24 MARCH 2004

Recommended for New  Designs

Delivery Options

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10MHz CFPT-9003 EX 1 B

Frequency Stability

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Temperature: see table

Typical Supply Voltage Variation  ±10% < ±0.2 ppm*

Typical Load Coefficient 15pF  ±5pF < ±0.2 ppm*

*Dependant on frequency and  output type

Please contact our sales office  for current leadtimes

Description

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A series of surface mountable 7.0  × 5.0mm TCXOs for

medium to high volume  applications where small size

and high performance are  pre-requisites. This oscillator

uses C-MAC’s latest custom ASIC  "Pluto", a single chip

oscillator and analogue  compensation circuit, capable

of sub 1 ppm performance over an  extended tempera-

ture range. Its ability to  function down to a supply volt-

age of 2.4V and low power  consumption make it partic-

ularly suitable for mobile  applications

Frequency Adjustment

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Three options with external  Control Voltage applied to

pad 10:

A - Ageing adjustment: >  ±5ppm, frequency < 20MHz

                     (Standard Option)

> ±7ppm, frequency > 20MHz

B - No frequency adjustment  initial calibration @ 25°C

   < ±0.5 ppm

C - High Pulling ±10ppm to ±50ppm  can be available

   depending on frequency and stability  options.

   Please consult our sales office

Standard Frequencies

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10MHz

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Linearity

Slope

Input resistance

Modulation bandwidth

Standard control voltage ranges:

Without reference voltage

Without reference voltage

With reference voltage

< 1%

Positive

> 100k?

> 2kHz

Output Waveform

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Square HCMOS 15pF load

Square ACMOS 50pF max. load

(Available on request, contact  sales office)

Sinewave 10k? // 10pF AC-coupled,

Clipped sinewave 10k? // 10pF  AC-coupled,

SURFACE MOUNT

   TCXOs

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- Vs=5.0V 2.5V±1V

- Vs=3.3V 1.65V±1V

- Vc=0V to Vref

Supply Voltage

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Operating range 2.4 to 6.0V, see  table

Reference Voltage, Vref

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Current Consumption

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HCMOS Typically ≈

1+Frequency(MHz)*Supply(V)*{Load(pF)+15}*10-3  mA

E. g. 20MHz, 5V, 15pF ≈ 4mA

Sinewave Typically < 8mA

Clipped Sinewave Typically ≈

1+Frequency(MHz)*1.2*{Load(pF)+30}*10-3  mA

Optional reference voltage output  on pad 1, suitable for

potentiometer supply or DAC  reference.

1. No output (Standard option)

2. 2.2V, for Min. Vs>2.4V

3. 2.7V, for Min. Vs>3.0V

4. 4.2V, for Min. Vs>4.5V

Maximum load current (mA) = Vref  /10

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Package Outline

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7.0 x 5.0 x 2.0mm SMD (Surface  mount device)

ceramic carrier

For manual frequency adjustment  connect an external

50K? potentiometer between pad 1  (Reference Voltage)

and pad 4 (Ground) with wiper  connected to pad 10

(Voltage Control). Please specify  reference voltage as part

of the ordering code

Tri-state

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Ageing

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±1ppm maximum in first year,  frequency < 20MHz

±2ppm maximum in first year,  frequency > 20MHz

Pad 8 open circuit or >0.6Vs  output enabled

< 0.2Vs Tri-state

When Tri-stated, the output stage  is disabled for all out-

put options, but the oscillator  and compensation circuit

are still active

(Current consumption <1mA)

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±3ppm maximum for 10 years,  frequency < 20MHz

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±5ppm maximum for 10 years,  frequency > 20MHz

±1ppm maximum after reflow