Rainbow-electronics MAX1092 Manual do Utilizador descarregar pdf (Página 14)

MAX1090/MAX1092

cies lower than 100kHz is not recommended because it

will cause a voltage droop across the hold capacitor in

the T/H stage that will result in degraded performance.

Digital Interface

Input (control byte) and output data are multiplexed on

a three-state parallel interface. This parallel interface

(I/O) can easily be interfaced with standard µPs. The

signals CS, WR, and RD control the write and read

operations. CS represents the chip-select signal, which

enables a µP to address the MAX1090/MAX1092 as an

I/O port. When high, CS disables the CLK, WR, and RD

inputs and forces the interface into a high-impedance

(high-Z) state.

Input Format

The control byte is latched into the device on pins D7–

D0 during a write command. Table 2 shows the control

byte format.

Output Format

The output format for the MAX1090/MAX1092 is binary in

unipolar mode and two’s complement in bipolar mode.

When reading the output data, CS and RD must be low.

When HBEN = 0, the lower 8 bits are read. With HBEN =

1, the upper 2 bits are available and the output data bits

D7–D2 are set either low in unipolar mode or to the value

of the MSB in bipolar mode (Table 5).

400ksps, +5V, 8-/4-Channel, 10-Bit ADCs

with +2.5V Reference and Parallel Interface

14 ______________________________________________________________________________________

Table 2. Control Byte Format

Table 4. Channel Selection for Pseudo-Differential Operation (SGL/DIF = 0)

Table 3. Channel Selection for Single-Ended Operation (SGL/DIF = 1)

*Channels CH4–CH7 apply to MAX1090 only.

*Channels CH4

–CH7 apply to MAX1090 only.

A1 CH0

0 +0 -0

0 -1

CH2 CH4*

1 0 + -

CH3

CH1 CH7*CH6*

CH5*

1 - +0

0 0

+ -1

0 1 - +1

1 0 -1

1 1

1 +-

A1 CH0

0 +00

0 1

CH2 CH4*

1 0 +

CH3

CH1 CH7*

CH6*

COM

CH5*

1 + -0

0 0

0 1 +1

1 01

1 1

+ -

D6 D4

PD0

SGL/DIF

ACQMOD A2 A0A1

UNI/BIP

PD1

D5 D2 D0 (LSB)D1D3D7 (MSB)

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20

MAX1090/MAX1092 1

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