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====== AD5686R/AD5685R/AD5684R Quick Start Guide ======
** Quad, 16-/14-/12-Bit, Voltage Output DACs with a 2 ppm/ºC Reference, SPI Interface **

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{{ :resources:tools-software:ad5686r:ad5686r_block_diagram.png? 390X288 |}}\\
<WRAP centeralign>//Figure 1. Functional Block Diagram//</WRAP>
===== Features =====
  * High relative accuracy (INL): ±2 LSB maximum (16-bit [[adi>ad5686r|AD5686R]])
  * Low drift 2.5 V on-chip reference: 2 ppm/°C typical temperature coefficient
  * Tiny 3 mm × 3 mm 16-lead LFCSP  or 16-lead TSSOP package
  * Total unadjusted error (TUE): 0.1 % of FSR maximum
  * Offset error: 1.5 mV maximum
  * Gain error: 0.1% of FSR maximum
  * High drive capability: 20 mA, 0.5 V  from supply rails 
  * User selectable gain of 1 or 2 (GAIN pin)
  * Reset to zero scale or midscale (RSTSEL pin)
  * 1.8 V logic compatibility
  * 50 MHz SPI interface
  * 2.7 V to 5.5 V power supply
  * −40°C to +105°C temperature range
===== Pin Configurations =====
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<WRAP column 40%>{{ :resources:tools-software:ad5686r:16lfcsppinout.png? |}} </WRAP> 
<WRAP column 40%>{{ :resources:tools-software:ad5686r:16tssoppinout.png? |}} </WRAP>
<WRAP clear></WRAP>
<WRAP column 40%> <WRAP centeralign>//Figure 2. 16-Lead LFCSP//  </WRAP></WRAP>  
<WRAP column 40%> <WRAP centeralign>//Figure 3. 16-Lead TSSOP// </WRAP></WRAP>
<WRAP clear></WRAP>
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**Table 1. Function Descriptions for Quick Start**
^   Mnemonic     ^ Description      ^ 
|V<sub>OUT</sub>A  | Analog output voltage from DAC A.|
|V<sub>OUT</sub>B  | Analog output voltage from DAC B.|
|V<sub>OUT</sub>C  | Analog output voltage from DAC C.|
|V<sub>OUT</sub>D  | Analog output voltage from DAC D.|
|<m>overline{SYNC}</m>   | Connect to serial interface.   |
|SCLK   | Connect to serial interface.   |
|SDIN    | Connect to serial interface.  |
|SDO|No connect.|
|V<sub>REF</sub>   | No connect.|
|V<sub>DD</sub>    | Connect to 5 V supply. Decouple with 10 μF and 0.1 μF capacitors.  |
|GND    | Connect to ground.|
|<m>overline{LDAC}</m>   | Tie low.  |
|RSTSEL | Tie to GND to power up to zero scale.|
|GAIN   | Tie to GND. DAC outputs have a span from 0 V to V<sub>REF</sub>. |
|<m>overline{RESET}</m>  | Tie high. |
|V<sub>LOGIC</sub> | Connect to serial interface supply voltage.|
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===== Shift Register Contents =====
{{ :resources:tools-software:ad5686r:ad5686r_shift_register_contents.png? 700X160 |}}\\
<WRAP CENTERALIGN>//Figure 4. Shift Register Contents [[adi>ad5686r|(AD5686R]])//</WRAP>

**Table 2. Command Definitions**
^Command^^^^ ^
^C3	^C2	^C1	^C0	^Description ^
|0	|0	|0	|0	|No operation|
|0	|0	|0	|1	|Write to Input Register n (Dependent on LDAC)|
|0	|0	|1	|0	|Update DAC Register n with contents of Input Register n|
|0	|0	|1	|1	|Write to and update DAC Channel n|
|0	|1	|0	|0	|Power down/power up DAC |
|0	|1	|0	|1	|Hardware <m>overline{LDAC}</m> mask register|
|0	|1	|1	|0	|Software reset (power-on reset)|
|0	|1	|1	|1	|Internal reference setup register|
|1	|0	|0	|0	|Set up DCEN register (daisy-chain enable)|
|1	|0	|0	|1	|Set up readback register (readback enable)|
|1	|0	|1	|0	|Reserved|
|…	|…	|…	|…	|Reserved|
|1	|1	|1	|1	|Reserved|


===== Transfer Function =====
 <m>V_OUT = V_REF * Gain delim{[}{D/2^N}{]}</m>\\
where:\\ 
//D// is the decimal equivalent. \\ 
//N// is the number of bits. \\ 
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==== Simple Write: Example 1 ====
<WRAP tip>To update Channel A, write the following over the serial interface: 0001 XXX1 1000000000000000 
(four command bits, four address bits, 16 data bits for the [[adi>ad5686r|AD5686R]]).\\
This updates Channel A to midscale.
GAIN = 1, V<sub>OUT</sub>A = 1.25 V.</WRAP>
{{  :resources:tools-software:ad5686r:example_write_1.png?  700X160  |}}\\
<WRAP CENTERALIGN>//Figure 5. Simple Write—Update Channel A)//</WRAP>
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==== Simple Write: Example 2 ====

<WRAP tip>To update Channel B, write the following over the
serial interface: 0001 XX1X 1000000000000000.\\
This updates Channel B to midscale.
GAIN = 1, V<sub>OUT</sub>B = 1.25 V.</WRAP>
{{ :resources:tools-software:ad5686r:example_write_2.png? 700X160 |}}\\
<WRAP CENTERALIGN>//Figure 6. Simple Write—Update Channel B//</WRAP>
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==== Simple Write: Example 3 ====
<WRAP tip>To update both Channel A and Channel B, write the following over the serial interface:
0001 XX11 1111111111111111. This updates both channels to full scale. GAIN = 1, V<sub>OUT</sub>B = 2.5 V, V<sub>OUT</sub>A = 2.5 V.</WRAP>

{{ :resources:tools-software:ad5686r:example_write_3.png? 700X160 |}}\\
<WRAP CENTERALIGN>//Figure 7. Simple Write—Update Channel A and Channel B//</WRAP>
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