Electronic Components Datasheet Search |
|
AD660ANZ1 Datasheet(PDF) 11 Page - Analog Devices |
|
AD660ANZ1 Datasheet(HTML) 11 Page - Analog Devices |
11 / 20 page AD660 Rev. B | Page 11 of 20 BIPOLAR CONFIGURATION The circuit shown in Figure 10 provides a bipolar output voltage from −10.000000 V to +9.999694 V with positive full scale occur- ring with all bits on. As in the unipolar mode, Resistor R1 and Resistor R2 can be eliminated altogether to provide AD660 bipolar operation without any external components. Eliminating these resistors increases the gain error by 0.50% of FSR in bipolar mode. HBE CONTROL LOGIC SER CLR LDAC REF IN R1 50Ω R2 50Ω REF OUT AD660 SOUT VOUT AGND SPAN/ BIPOLAR OFFSET DGND –VEE +VCC +VLL 10V REF 16-BIT LATCH 16-BIT DAC 16 17 18 19 23 24 20 21 22 13 1 2 3 4 15 OUTPUT 10kΩ 10kΩ 10.05kΩ DB1/DB9/ DATADIR 11 LBE/ CLEAR SELECT DB0/ DB8/ SIN CS DB7/ DB15 5 12 14 16-BIT LATCH Figure 10. ±10 V Bipolar Voltage Output Gain offset and bipolar zero errors can be adjusted to zero using the circuit shown in Figure 11 as follows: 1. Offset adjust. Turn off all bits. Adjust the trimmer, R2, to give 10.000000 V output. 2. Gain adjust. Turn all bits on and adjust R1 to give a reading of 9.999694 V. 3. Bipolar zero adjust (optional). In applications where an accurate zero output is required, set the MSB on, all other bits off, and readjust R2 for 0 V output. HBE CONTROL LOGIC SER CLR LDAC REF IN R1 50Ω REF OUT AD660 SOUT VOUT AGND SPAN/ BIPOLAR OFFSET DGND –VEE +VCC +VLL 10V REF 16-BIT LATCH 16-BIT DAC 16 17 18 19 23 24 20 21 22 13 1 2 3 4 15 OUTPUT R2 100Ω 10kΩ 10kΩ 10.05kΩ DB1/DB9/ DATADIR 11 LBE/ CLEAR SELECT DB0/ DB8/ SIN CS DB7/ DB15 5 12 14 16-BIT LATCH Figure 11. ±10 V Bipolar Voltage Output with Gain and Offset Adjustment Note that using external resistors introduces a small temperature drift component beyond that inherent in the AD660. The inter- nal resistors are trimmed to ratio-match and temperature-track other resistors on-chip, even though their absolute tolerances are ±20% and absolute temperature coefficients are approximately −50 ppm/°C. In the case that external resistors are used, the temperature coefficient mismatch between internal and external resistors, multiplied by the sensitivity of the circuit to variations in the external resistor value, is the resultant additional tempera- ture drift. INTERNAL/EXTERNAL REFERENCE USE The AD660 has an internal low noise buried Zener diode reference that is trimmed for absolute accuracy and temperature coefficient. This reference is buffered and optimized for use in a high speed DAC and gives long-term stability equal or superior to the best discrete Zener diode references. The performance of the AD660 is specified with the internal reference driving the DAC and with the DAC alone (for use with a precision external reference). The internal reference has sufficient buffering to drive external circuitry in addition to the reference currents required for the DAC (typically 1 mA to REF IN and 1 mA to SPAN/BIPOLAR OFFSET). A minimum of 2 mA is available for driving external loads. The AD660 reference output should be buffered with an external op amp if it is required to supply more than 4 mA total current. The reference is tested and guaranteed to ±0.2% maximum error. |
Similar Part No. - AD660ANZ1 |
|
Similar Description - AD660ANZ1 |
|
|
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 |