Rainbow-electronics MAX1033 Manual do Utilizador descarregar pdf (Página 18)

Differential Common-Mode Range

The MAX1032/MAX1033 differential common-mode

range (V

CMDR

) must remain within -14V to +10V to

obtain valid conversion results. The differential com-

mon-mode range is defined as:

In addition to the common-mode input voltage limita-

tions, each individual analog input must be limited to

±16.5V with respect to AGND1.

The range-select bits R[2:0] in the analog input config-

uration bytes determine the full-scale range for the cor-

responding channel (Tables 2 and 6). Figures 9, 10,

and 11 show the valid analog input voltage ranges for

the MAX1032/MAX1033 when operating with FSR =

12V, FSR = 24V, and FSR = 48V, respectively. The

shaded area contains the valid common-mode voltage

ranges that support the entire FSR.

CH CH

CMDR

_ _

()

−

MAX1032/MAX1033

8-/4-Channel, ±12V Multirange Inputs,

Serial 14-Bit ADCs

18 ______________________________________________________________________________________

Table 3. Input Data Word Formats

DATA BIT

OPERATION

(START)

D6 D5 D4 D3 D2 D1 D0

Conversion-Start Byte

(Tables 4 and 5)

1C2C1C00000

Analog-Input Configuration Byte

(Table 2)

1C2C1C0

DIF/SGL

R2 R1 R0

Mode-Control Byte

(Table 7)

1M2M1M01000

Table 4. Channel Selection in Single-Ended Mode (DIF/SGL = 0)

CHANNEL-SELECT BIT CHANNEL

C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7

AGND1

000+ -

001 + -

010 + -

011 + -

100 + -

101 + -

110 +-

111 +-

Table 5. Channel Selection in True-Differential Mode (DIF/SGL = 1)

CHANNEL-SELECT BIT CHANNEL

C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7

AGND1

000+-

001 RESERVED

010 +-

011 RESERVED

100 +-

101 RESERVED

110 +-

111 RESERVED

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 30 31

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