MAX156BCNG(2012) データシートの表示（PDF） - Maxim Integrated

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MAX156BCNG
(Rev.:2012)

8-/4-Channel ADCs with Simultaneous T/Hs and Reference

Maxim Integrated 

MAX155/MAX156

8-/4-Channel ADCs with Simultaneous

T/Hs and Reference

Multiplexer and A/D Configuration

A conversion is started with a WR pulse. All channels

sample on WR’s falling edge. Mux configuration data is

loaded on WR’s rising edge. In I/O mode (MODE = Open

Circuit), selections for channel number, single­or multi-

channel conversion, unipolar or bipolar input, and single-

ended or differential input are made with A0-A2, ALL, BIP,

and DIFF (Table 1). These input pins are also shared with

the RAM data outputs D0–D7. An alternate, simpler inter-

face is provided by the hard-wired mode, which selects

some general mux configurations without requiring ADC

programming. Hard-wired connections of MODE and VSS

select from 4 mux configurations as listed in Table 4 (see the

Hard-Wired Mode section).

On the rising edge of WR, the mux configuration register

is updated; falling edge initiates sampling of all inputs.

A channel selection can be implemented on the current

conversion, but changes from unipolar to bipolar (with

BIP) or from single­ended to differential operation (with

DIFF) do not go into effect until the following WR. This can

be overcome by writing to the configuration register while

inhibiting the conversion (INH = 1), or by changing DIFF

and BIP one conversion early, i.e. on the previous write.

Table 2. Single-Ended Channel Selection (MODE = Open Circuit)

MUX ADDRESS

A0

A1

A2

DIFF

0

1

0

0

0

0

+

1

0

0

0

+

0

1

0

0

1

1

0

0

0

0

1

0

1

0

1

0

0

1

1

0

1

1

1

0

Note: Shaded areas represent MAX156 operation.

SINGLE-ENDED CHANNEL SELECTION

2

3

4

5

6

+

+

+

+

+

7

AGND

-

-

-

-

-

-

-

+

-

Table 3. Differential Channel Selection (MODE = Open Circuit)

MUX ADDRESS

DIFFERENTIAL CHANNEL SELECTION

A0

A1

A2

DIFF

0

1

2

3

4

5

6

7

0

0

0

1

+

-

0

1

0

1

+

-

0

0

1

1

+

-

0

1

1

1

+

-

1

0

0

1

-

+

1

1

0

1

-

+

1

0

1

1

-

+

1

1

1

1

Note: Shaded areas represent MAX156 operation.

-

+

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