AD7228ABRZ

更新时间： 2024-02-10 04:41:27

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亚德诺 - ADI		/
页数	文件大小	规格书
8页	209K
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AD7228ABRZ 数据手册

AD7228A

DACs for correct timing relationships during the calibration

cycle of the instrument.

Figure 12. Self-Program m able Reference

Figure 10b. AD7228A Tim ing Deskew Circuit

CO ARSE/FINE AD JUST

T he DACs on the AD7228A can be paired together to form a

coarse/fine adjust function as indicated in Figure 11. T he func-

tion is achieved using one external op amp and a few resistors

per pair of DACs.

DAC1 is the most significant or coarse DAC. Data is first

loaded to this DAC to coarsely set the output voltage. DAC2 is

then used to fine tune this output voltage. Varying the ratio of

R1 to R2 varies the relative effect of the coarse and fine DACs

on the output voltage. For the resistor values shown, DAC2 has

a resolution of 150 µV in a 10 V output range. Since each DAC

on the AD7228A is guaranteed monotonic, the coarse adjust-

ment and fine adjustment are each monotonic. One application

for this is as a set-point controller (see “Circuit Applications of

the AD7226 Quad CMOS DAC” available from Analog Devices,

Publication Number E873–15–11/84).

Figure 13. Variation of V_REFwith Feedback Configuration

MICRO P RO CESSO R INTERFACING

Figure 14. AD7228A to 8085A/Z80 Interface

Figure 11. Coarse/Fine Adjust Circuit

SELF-P RO GRAMMABLE REFERENCE

T he circuit of Figure 12 shows how one DAC of the AD7228,

in this case DAC1, may be used in a feedback configuration to

provide a programmable reference for itself and the other seven

converters. T he relationship of V_REFto V_INis expressed by

1 + G

(

)

V_REF

•V_IN

where G = R2/R1

1 + G • D

(

)

Figure 13 shows typical plots of V_REFversus digital code, D₁, for

three different values of G. With V_IN= 2.5 V and G = 3 the

voltage at the output varies between 2.5 V and 10 V giving an

effective 10-bit dynamic range to the other seven converters. For

correct operation of the circuit, V_SSshould be –5 V and R1

greater than 6.8 kΩ.

Figure 15. AD7228A to 6809/6502 Interface

–7–

REV. A

1...4 5 678

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AD7228ABRZ 替代型号

型号	品牌	替代类型	描述	数据表
AD7228ACR	ADI	完全替代	LC2MOS Octal 8-Bit DAC
AD7228ABR	ADI	完全替代	LC2MOS Octal 8-Bit DAC

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