 |
Moteur de recherche de fiches techniques de composants électroniques |
|
|
Moteur de recherche de fiches techniques de composants électroniques |
|
LTC2335-18 Fiches technique(PDF) 27 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC2335-18 Fiches technique(HTML) 27 Page - Linear Technology |
|
|
27 / 40 page  LTC2335-16 27 233516f For more information www.linear.com/LTC2335-16 and 2ppm/°C (maximum) temperature coefficient for high precision applications. The LTC6655-2.048 is fully speci- fied over the H-grade temperature range, complementing the extended temperature range of the LTC2335-16 up to 125°C.BypassingtheLTC6655-2.048witha2.7µFto100µF ceramic capacitor close to the REFIN pin is recommended. External Reference with Disabled Internal Buffer The internal reference buffer supports VREFBUF = 4.4V maximum. Grounding REFIN disables the internal buffer, allowing REFBUF to be overdriven with an external refer- ence voltage between 2.5V and 5V, as shown in Figure 10c. Maximum input signal swing and SNR are achieved byoverdrivingREFBUFusinganexternal5Vreference.The buffer feedback resistors load the REFBUF pin with 13kΩ evenwhenthereferencebufferisdisabled.TheLTC6655-5 offers the same small size, accuracy, drift, and extended temperature range as the LTC6655-2.048, and achieves a typical SNR of 95.3dB when paired with the LTC2335- 16. Bypass the LTC6655-5 to GND (Pin 20) close to the REFBUF pin with at least a 47μF ceramic capacitor (X7R, 10V, 1210 size or X5R, 10V, 0805 size) to absorb transient conversion currents and minimize noise. The LTC2335-16 converter draws a charge (QCONV) from the REFBUF pin during each conversion cycle. On short time scales most of this charge is supplied by the external REFBUF bypass capacitor, but on longer time scales all of the charge is supplied by either the reference buffer, or when the internal reference buffer is disabled, the external reference. This charge draw corresponds to a DC current equivalentofIREFBUF=QCONV • fSMPL,whichisproportional to sample rate. In applications where a burst of samples is taken after idling for long periods of time, as shown in Figure 11, IREFBUF quickly transitions from approximately 0.4mA to 1.1mA (VREFBUF = 5V, fSMPL = 1Msps). This current step triggers a transient response in the external reference that must be considered, since any deviation in VREFBUFaffectsconverteraccuracy.Ifanexternalreference is used to overdrive REFBUF, the fast settling LTC6655 family of references is recommended. Internal Reference Buffer Transient Response Foroptimumperformanceinapplicationsemployingburst sampling, the external reference with internal reference bufferconfigurationshouldbeused.Theinternalreference buffer incorporates a proprietary design that minimizes movements in VREFBUF when responding to a burst of applicaTions inForMaTion Figure 11. CNV Waveform Showing Burst Sampling Figure 10c. External Reference with Disabled Internal Buffer Configuration CNV IDLE PERIOD IDLE PERIOD 233516 F11 233516 F10c 47µF 6.5k 20k LTC2335-16 REFERENCE BUFFER REFBUF REFIN GND BANDGAP REFERENCE 6.5k LTC6655-5 |
Numéro de pièce similaire - LTC2335-18 |
|
Description similaire - LTC2335-18 |
|
|
Lien URL |
| Politique de confidentialité |
| ALLDATASHEET.FR |
| ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |
French ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
