MAX1400CAI+【PDF 13/34 页】IC ADC 18BIT LP 28-SSOP

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MAX1400

+5V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

______________________________________________________________________________________

Table 11. Channel ID Tag Codes

Switching Network

A switching network provides selection between three

fully differential input channels or five pseudo-differen-

tial channels, using AIN6 as a shared common. The

switching network provides two additional fully differen-

tial input channels intended for system calibration,

which may be used as extra fully differential signal

channels. Table 12 shows the channel configurations

available for both operating modes.

Scanning (SCAN-mode)

To sample and convert the available input channels

sequentially, set the SCAN control bit in the global

setup register. The sequence is determined by DIFF

(fully differential or pseudo-differential) and by the

mode control bits M1 and M0 (Tables 8, 9, 10). With

SCAN set, the part automatically sequences through

each available channel, transmitting a single conver-

sion result before proceeding to the next channel. The

MAX1400 automatically allows sufficient time for each

conversion to fully settle, to ensure optimum resolution

before asserting the data-ready signal and moving to

the next available channel. The scan rate is, therefore,

dependent on the clock bit (CLK), the filter control bits

(FS1, FS0), and the modulator frequency selection bits

(MF1, MF0).

Burnout Currents

The input circuitry also provides two “burnout” currents.

These small currents may be used to test the integrity

of the selected transducer. They can be selectively

enabled or disabled by the BOUT bit in the global

setup register.

CHANNEL

CID2

AIN1–AIN2

AIN5–AIN6

Calibration

AIN3–AIN4

AIN1–AIN6

AIN3–AIN6

AIN4–AIN6

AIN2–AIN6

CID0

CID1

Table 12. Input Channel Configuration in Fully and Pseudo-Differential Modes

(SCAN = 0)

X = Don’t Care.

* This combination is available only in pseudo-differential mode when using the internal scanning logic

** These combinations are only available in the calibration modes.

DIFF

AIN2

AIN4

AIN3

AIN1

AIN3

CALOFF+**

AIN5

AIN1

CALOFF+**

HIGH INPUT

CALGAIN+**

AIN5*

CALGAIN+**

MODE

Pseudo-

Differential

Fully

Differential

AIN6

AIN4

CALOFF-**

AIN6

AIN2

CALOFF-**

LOW INPUT

CALGAIN-**

AIN6*

CALGAIN-**

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