 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC2470 Datasheet(PDF) 8 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC2470 Datasheet(HTML) 8 Page - Linear Technology |
|
|
8 / 22 page  LTC2470/LTC2472 8 24702fb For more information www.linear.com/LTC2470 applicaTions inForMaTion complete, the SLEEP state is entered and power is reduced to 2μA (maximum). The reference is powered up once CS is brought low. The reference startup time is 12ms (if the reference and compensation capacitor values are both 0.1μF). As the reference and compensation capacitors are decreased, the startup time is reduced (see Figure 3), but the transition noise increases (see Figure 4). Upon entering the DATA INPUT/OUTPUT state, SDO outputs the sign (D15) of the conversion result. During this state, the ADC shifts the conversion result serially through the SDO output pin under the control of the SCK input pin. There is no latency in generating this data and the result corresponds to the last completed conversion. A new bit of data appears at the SDO pin following each falling edge detected at the SCK input pin and appears from MSB to LSB. The user can reliably latch this data on every rising edge of the external serial clock signal driving the SCK pin. During the DATA INPUT/OUTPUT state, the LTC2470/ LTC2472 can be programmed to SLEEP or NAP (default) and the output rate can be updated. Data is shifted into the device through the SDI pin on the rising edge of SCK. The input word is 4 bits. If the first bit EN1 = 1 and the second bit EN2 = 0 the device is enabled for programming. The following two bits (SPD and SLP) will be written into the device. SPD is used to select the output rate. If SPD = 0 (Default) the output rate is 208sps and SPD = 1 sets a 833sps output rate. The next bit (SLP) enables the sleep or nap mode. If SLP = 0 (default) the reference remains powered up at the end of each conversion cycle. If SLP = 1, the reference powers down following the next conver- sion cycle. The remaining 12 SDI input bits are ignored (don’t care). SDI may also be tied directly to GND or VDD in order to simplify the user interface. If SDI is tied LOW the output rate is 208sps and if SDI is tied HIGH the output rate is 833sps. The reference sleep mode is disabled if SDI is tied to GND or VDD. The DATA INPUT/OUTPUT state concludes in one of two differentways.First,theDATAINPUT/OUTPUTstateopera- tion is completed once all 16 data bits have been shifted out and the clock then goes low. This corresponds to the 16th falling edge of SCK. Second, the DATA INPUT/OUT- PUT state can be aborted at any time by a LOW-to-HIGH transition on the CS input. Following either one of these twoactions,theLTC2470/LTC2472willentertheCONVERT state and initiate a new conversion cycle. Power-Up Sequence When the power supply voltage (VCC) applied to the con- verter is below approximately 2.1V, the ADC performs a power-on reset. This feature guarantees the integrity of the conversion result. When VCC rises above this critical threshold, the converter generates an internal power-on reset (POR) signal for approximately 0.5ms. For proper operation VDD needs to be restored to normal operating range (2.7V to 5.5V) Figure 4. Transition Noise RMS vs COMP and Reference Capacitance Figure 3. Reference Start-Up Time vs VREF and Compensation Capacitance CAPACITANCE (µF) 1 50 150 250 24702 F03 –50 0 100 200 0.1 0.01 0.001 VCC = 5.5V VCC = 4.1V VCC = 2.7V 0.001 0.01 0.1 0.0001 10 1 CAPACITANCE (µF) 24702 F04 0 5 10 15 20 25 |
Similar Part No. - LTC2470_15 |
|
Similar Description - LTC2470_15 |
|
|
|
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
