VREE(d,2*+d,2+d.2+d20)Vo = -Ri =-RR VREFD24对n位输入时，应有VREF(d./2"-+d.22"-+..+d.2'+d.2°)Vo=-Ri, =-R2hRVREF-D2"2n-11D,范围为0~2"-1,V。=0~REF2nVREF取“负”则得V为“正”11
11 D V d d d d R V V R i R n n REF n n n n n REF O 2 2 2 2 2 2 1 0 0 1 1 2 2 1 1 = − = − = − + + + + − − − − ( ) 对 位输入时，应有 n REF n O n Dn V V 2 2 1 0 2 1 0 − 范围为 ~ − , = ~ − VREF取“负”则得VO 为“正” D V d d d d R V V R i R REF REF O 4 0 0 1 1 2 2 3 4 3 2 2 2 2 2 2 1 = − = − = − ( + + + )
实例：CB7520(LSB)(MSB)d.dd.dsdsd.d,VDDd.d.do139765414121081116(RF)W1(lout)R2(lour)00SSsS2S3STSSoS1S6S.E2R2R2R2R2R三2R2R三2R2R三2R三2R20k2RRRRRRRR15VREFCB752010k23GND12
12 实例：CB7520