Datasheet > AL1214H

AL1214H

更新时间： 2022-01-19 05:40:00

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AL1214H 数据手册

10BIT 80MSPS DAC

Testability

AL1214H

Whether you use MUX or the internal logic for testability, it is required to be able to select the values of digital

inputs ( D<9:0> ) See above figure. Only if it is, you can check the main function ( Linearity ) ,and

output(IO),VBIAS,IREF,and CCOMP pins are reserved for external use.

Analysis

The voltage applied to VBIAS is measured at IREF node . And the voltage value is proportioned to the reference

current value of resistor which is connected to IREF node. So you can estimate the full scale current value by

measuring the voltage, and check the DC characteristics of the OPAMP. For reference, as VREF applied to

VBIAS node is given at IREF node, the current flowing through RSET is given as VREF/RSET. The voltage is

scaled factor of 1/116 for HDD and 1/456 for VIDEO. The full scale current is given as the decimal value

equivalent to the digital code.

* Resolution

If you want to change the resolution, use as many appear bits as you want and connect the rest

lower bits to the ground as above diagram which is 8bit application.

* Output Range Alteration

In order to change the output swing, use following equation.

Vout = { Vref/(RSET*116) }*DAC_CODE*Rio

Output swing width is a function of Vi(VBIAS=3.2V , Vref=1.4V) , RSET(1kohm or 463ohm ), and

Rio(160Ohm or 37.5 Ohm) maximum output swing width is (2Vpp or 1Vpp)

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