 |
Zakładka z wyszukiwarką danych komponentów |
|
|
Zakładka z wyszukiwarką danych komponentów |
|
AD5544ARS Arkusz danych(PDF) 13 Page - Analog Devices |
|
|
|||||||||||||||||||||||||||||
AD5544ARS Arkusz danych(HTML) 13 Page - Analog Devices |
|
|
13 / 16 page  REV. 0 AD5544/AD5554 –13– VREFX VSS DGND VDD RFBX IOUTX AGNDF AGNDX RR R R 2R 2R 2R 5k S1 S2 FROM OTHER DACS AGND DIGITAL INTERFACE CONNECTIONS OMITTED FOR CLARITY. SWITCHES S1 AND S2 ARE CLOSED, VDD MUST BE POWERED. Figure 4. Typical Equivalent DAC Channel These DACs are also designed to accommodate ac reference input signals. Both AD5544/AD5554 will accommodate input reference voltages in the range of –12 V to +12 V. The reference voltage inputs exhibit a constant nominal input resistance of 5k Ω, ± 30%. On the other hand, the DAC outputs IOUTA, B, C, D are code-dependent and produce various output resis- tances and capacitances. The choice of external amplifier should take into account the variation in impedance generated by the AD5544/AD5554 on the amplifiers’ inverting input node. The feedback resistance, in parallel with the DAC ladder resistance, dominates output voltage noise. For multiplying mode applications, an external feedback compensation capacitor (CFB) may be needed to provide a critically damped output response for step changes in reference input voltages. Figures 5 and 6 show the gain vs. frequency performance at various attenuation settings using a 23 pF external feedback capacitor connected across the IOUTX and RFBX terminals for AD5544 and AD5554 respectively. In order to maintain good analog performance, power supply bypassing of 0.01 µF, in parallel with 1 µF, is recommended. Under these conditions, clean power supply with low ripple voltage capability should be used. Switching power supplies is usually not suitable for this application due to the higher ripple voltage and PSS frequency-dependent characteristics. It is best to derive the AD5544/AD5554’s 5 V supply from the systems’ analog supply voltages. (Do not use the digital 5 V supply.) See Figure 7. FREQUENCY – Hz 1k FFFFH 10k 100k 1M 10M 100 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 ZS VDD = 5V VREF = 100mV rms TA = 25 C B1 B0 Figure 5. AD5554 Reference Multiplying Bandwidth vs. Code FREQUENCY – Hz 1k 3FFFH 10k 100k 1M 10M 100 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 ZS VDD = 5V VREF = 100mV rms TA = 25 C CF = 23pF Figure 6. AD5554 Reference Multiplying Bandwidth vs. Code VREFX VSS DGND VDD RFBX IOUTX AGNDF AGNDX RR R R 2R 2R 2R 5k S1 S2 FROM OTHER DACS AGND AD5544 + A1 15V VEE VCC VOUT LOAD 2R R 5V 15V ANALOG POWER SUPPLY DIGITAL INTERFACE CONNECTIONS OMITTED. FOR CLARITY SWITCHES S1 AND S2 ARE CLOSED, VDD MUST BE POWERED. + Figure 7. Recommended Kelvin-Sensed Hookup |
|
|
Link URL |
| Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Link do karty katalogowej | Linki | Lista producentów 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 |
Polish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
