 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
AD5933 датащи(PDF) 9 Page - Analog Devices |
|
||||||||||||||||||||||||||||||
AD5933 датащи(HTML) 9 Page - Analog Devices |
|
|
9 / 20 page  Preliminary Technical Data AD5933 Rev. PrA | Page 9 of 20 Figure 8. The DFT algorithm is represented by X(f) = SUM x(n)[Cos(n)-jSine(n)] Both the real and Imaginary data register have 15 bits of data and one sign bit. The 15 bits of data are in 2’s compliment format. The magnitude of the signal can be represented by Magnitude = R + I 22 This magnitude that’s returned is a scaled valued of the actual complex impedance measured. The multiplication factor between the magnitude returned and the actual impedance is called the GAIN FACTOR. The user needs to then calculate this GAIN FACTOR value and use it for calibration in the system. TEMPERATURE SENSOR The temperature sensor is a 13-bit digital temperature sensor with a 14th bit that acts as a sign bit. The block houses an on- chip temperature sensor, a 13-bit A/D converter and a reference circuit. The A/D converter section consists of a conventional successive-approximation converter based around a capacitor DAC. The on-chip temperature sensor allows an accurate measure- ment of the ambient device temperature to be made. The specified measurement range of the sensor is −40°C to +150°C. At +150°C. The structural integrity of the device starts to deteriorate when operated at voltage and temperature maximum specifications. Temperature Conversion Details The conversion clock for the part is internally generated; no external clock is required except when reading from and writing to the serial port. In normal mode, an internal clock oscillator runs an automatic conversion sequence. During this automatic conversion sequence, a conversion is initiated every 1 second. At this time, the part powers up its analog circuitry and performs a temperature conversion. This temperature conversion typically takes 800 µs, after which time the analog circuitry of the part automatically shuts down. The analog circuitry powers up again when the 1 second timer times out and the next conversion begins. The result of the most recent temperature conversion is always available in the serial output register because the serial interface circuitry never shuts down. The temperature sensor block will default to a power-down state. To perform a temperature measurement a command is written to the control register. After the temperature operation is complete, the block automatically powers down until the next temperature command is issued. In normal conversion mode, the internal clock oscillator is reset after every read or write operation. This causes the device to start a temperature conversion, the result of which is typically available 800 µs later. Similarly, when the part is taken out of shutdown mode, the internal clock oscillator is started and a conversion is initiated. The conversion result is available 800 µs later, typically. Reading from the device before a conversion is complete causes the block to stop converting; the part starts again when serial communication is finished. Temperature Value Register The temperature value register is a 16-bit read-only register that stores the temperature reading from the ADC in 13-bit twos complement format plus a sign bit. The two MSB bits are don’t cares. DB13 is the sign bit. The ADC can theoretically measure a 255°C temperature span. The internal temperature sensor is guaranteed to a low value limit of –40°C and a high limit of +150°C. Table 4. Temperature Data Format Temperature Digital Output DB13…DB0 −40°C 11, 1011 0000 0000 −30°C 11, 1100 0100 0000 −25°C 11, 1100 1110 0000 −10°C 11, 1110 1100 0000 −0.03125°C 11, 1111 1111 1111 0°C 00, 0000 0000 0000 +0.03125°C 00, 0000 0000 0001 +10°C 00, 0001 0100 0000 +25°C 00, 0011 0010 0000 +50°C 00, 0110 0100 0000 +75°C 00, 1001 0110 0000 +100°C 00, 1100 1000 0000 +125°C 00, 1111 1010 0000 +150°C 01, 0010 1100 0000 Temperature Conversion Formula 1. Positive Temperature = ADC Code(d)/32 2. Negative Temperature = (ADC Code*(d) – 16384)/32 *Using all 14 bits of the data byte, includes the sign bit. Negative Temperature = (ADC Code(d)* – 8192)/32 *DB13 (sign bit) is removed from the ADC code |
Аналогичный номер детали - AD5933 |
|
Аналогичное описание - AD5933 |
|
|
|
ссылки URL |
| Конфиденциальность |
| ALLDATASHEETRU.COM |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю 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 |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
