 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC1410I Datasheet(PDF) 11 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC1410I Datasheet(HTML) 11 Page - Linear Technology |
|
|
11 / 16 page  11 LTC1410 APPLICATIONS INFORMATION 1 2 3 4 5 0.1 µF 10 µF ANALOG INPUT 1410 F08b LT1019A-2.5 VOUT VIN 5V +AIN –AIN VREF REFCOMP AGND LTC1410 Figure 8b. Using the LT1019-2.5 as an External Reference easily overdriven in applications where an external refer- ence is required. The reference amplifier provides buffer- ing between the internal reference and the capacitive DAC. The reference amplifier compensation pin REFCOMP (Pin 4), must be bypassed with a capacitor to ground. The reference amplifier is stable with capacitors of 1 µF or greater. For the best noise performance, a 10 µF tantalum in parallel with 0.1 µF ceramic is recommended. The VREF pin can be driven with an external reference (Figure 8b), a DAC or other means to provide input span adjustment. The VREF should be kept in the range of 2.25V to 2.75V for specified linearity. Full-Scale and Offset Adjustment Figure 9 shows the ideal input/output characteristics for the LTC1410. The code transitions occur midway between successive integer LSB values (i.e., – FS + 0.5LSB, – FS + 1.5LSB, – FS + 2.5LSB, . . . FS – 1.5LSB, FS – 0.5LSB).The output is two’s complement binary with 1LSB = [(+FS) – (– FS)]/4096 = 5V/4096 = 1.22mV. In applications where absolute accuracy is important, offset and full-scale errors can be adjusted to zero. Offset error must be adjusted before full-scale error. Figure 10 shows the extra components required for full-scale error adjustment. Zero offset is achieved by adjusting the offset applied to the – AIN input. For zero offset error apply – 0.61mV (i.e., – 0.5LSB) at +AIN and adjust the offset at the – AIN input until the output code flickers between 0000 0000 0000 and 1111 1111 1111. For full-scale adjust- ment, an input voltage of 2.49817V (FS – 1.5LSBs) is applied to AIN and R2 is adjusted until the output code flickers between 0111 1111 1110 and 0111 1111 1111. BOARD LAYOUT AND BYPASSING Wire wrap boards are not recommended for high resolu- tion or high speed A/D converters. To obtain the best performance from the LTC1410, a printed circuit board with ground plane is required. Layout for the printed circuit board should ensure that digital and analog signal lines are separated as much as possible. Particular care should be taken not to run any digital track alongside an analog signal track or underneath the ADC. The analog input should be screened by AGND. ANALOG INPUT 1410 F10 1 2 3 R4 100 Ω R2 50k R3 47k –5V R6 24k R1 50k R5 47k 4 5 0.1 µF 10 µF +AIN –AIN VREF REFCOMP AGND LTC1410 Figure 10. Offset and Full-Scale Adjust Circuit INPUT VOLTAGE, (+AIN) – (–AIN) (V) 0V –1 LSB 1410 F09 011...111 011...110 000...001 000...000 100...000 100...001 111...110 1 LSB BIPOLAR ZERO 111...111 FS – LSB –FS FS = 2.5V 1LSB = 2FS 4096 Figure 9. LTC1410 Transfer Characteristics |
Similar Part No. - LTC1410I |
|
Similar Description - LTC1410I |
|
|
|
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
