 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC1064-7 Datasheet(PDF) 11 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC1064-7 Datasheet(HTML) 11 Page - Linear Technology |
|
|
11 / 16 page  11 LTC1064-7 10647fb PI FU CTIO S External Connection Pins (7, 14) Pins 7 and 14 should be connected together. In a printed circuit board the connection should be done under the IC package through a short trace surrounded by the analog ground plane. NC Pins (1, 5, 8, 13) Pins 1, 5, 8 and 13 are not connected to any internal circuit point on the device and should preferably be tied to analog ground. Figure 4. Buffer for Filter Output 1k 1064-7 F04 LT1220 with a 0.1 µF capacitor. If the DC level at Pin 10 is switched mechanically or electrically at slew rates greater than 1V/ µs while the device is operating, a 10k resistor should be connected between Pin 10 and the DC source. Filter Input Pin (2) The input pin is connected internally through a 40k resis- tor tied to the inverting input of an op amp. Filter Output Pins (9, 6) Pin 9 is the specified output of the filter; it can typically source 3mA and sink 1mA. Driving coaxial cables or resistive loads less than 20k will degrade the total har- monic distortion of the filter. When evaluating the device’s distortion an output buffer is required. A noninverting buffer, Figure 4, can be used provided that its input common mode range is well within the filter’s output swing. Pin 6 is an intermediate filter output providing an unspecified 6th order lowpass filter. Pin 6 should not be loaded. Clock Feedthrough Clock feedthrough is defined as the RMS value of the clock frequency and its harmonics that are present at the filter’s output pin (9). The clock feedthrough is tested with the input pin (2) grounded and it depends on PC board layout and on the value of the power supplies. With proper layout techniques the values of the clock feedthrough are shown in Table 8. Table 8. Clock Feedthrough VS 50:1 100:1 Single 5V 90 µVRMS 100 µVRMS ±5V 100 µVRMS 300 µVRMS ±7.5V 120 µVRMS 650 µVRMS Note: The clock feedthrough at single 5V is imbedded in the wideband noise of the filter. Clock waveform is a square wave. amplitude strongly depends on scope probing techniques as well as grounding and power supply bypassing. The clock feedthrough, if bothersome, can be greatly reduced by adding a simple R/C lowpass network at the output of the filter pin (9). This R/C will completely eliminate any switching transients. Wideband Noise The wideband noise of the filter is the total RMS value of the device’s noise spectral density and it is used to determine the operating signal-to-noise ratio. Most of its frequency contents lie within the filter passband and it cannot be reduced with post filtering. For instance, the LTC1064-7 wideband noise at ±5V supply is 105µVRMS, 95 µVRMS of which have frequency contents from DC up to the filter’s cutoff frequency. The total wideband noise ( µVRMS) is nearly independent of the value of the clock. The clock feedthrough specifications are not part of the wideband noise. Any parasitic switching transients during the rise and fall edges of the incoming clock are not part of the clock feedthrough specifications. Switching transients have fre- quency contents much higher than the applied clock; their S APPLICATI I FOR ATIO |
Similar Part No. - LTC1064-7 |
|
Similar Description - LTC1064-7 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
