Rainbow-electronics MAX1303 Manual do Utilizador descarregar pdf (Página 16)

MAX1302/MAX1303

Figure 8 illustrates the software-selectable differential

analog input voltage range that produces a valid digital

output. Each analog input differential pair can be inde-

pendently programmed to one of three differential input

ranges by setting the R[2:0] control bits with DIF/SGL = 1.

Regardless of the specified input voltage range and

whether the channel is selected, each analog input is

±6V fault tolerant. The analog input fault protection is

active whether the device is unpowered or powered.

Any voltage beyond FSR, but within the ±6V fault-toler-

ant range, applied to an analog input results in a full-

scale output voltage for that channel.

Clamping diodes with breakdown thresholds in excess

of 6V protect the MAX1302/MAX1303 analog inputs

during ESD and other transient events (Figure 6). The

clamping diodes do not conduct during normal device

operation, nor do they limit the current during such

transients. When operating in an environment with the

potential for high-energy voltage and/or current tran-

sients, protect the MAX1302/MAX1303 externally.

8-/4-Channel, ±V

REF

Multirange Inputs,

Serial 16-Bit ADCs

16 ______________________________________________________________________________________

SCLK

DIN SC2C1C0 0000

ANALOG INPUT

TRACK AND HOLD*

HOLD

DOUT

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

BYTE 1 BYTE 2 BYTE 3 BYTE 4

SSTRB

INTCLK**

TRACK HOLD

HIGH IMPEDANCE

ACQ

100ns to 400ns

INTCLK

≈ 4.5MHz

SAMPLE

≈ f

SCLK

/ 32 + f

INTCLK

/ 17

*TRACK AND HOLD TIMING IS CONTROLLED BY SCLK.

**INTCLK IS AN INTERNAL SIGNAL AND IS NOT ACCESSIBLE TO THE USER.

SAMPLING INSTANT

Figure 3. External Acquisition-Mode Conversion (Mode 1)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 30 31

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