MAX1202ACAP 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1202ACAP

5V, 8-Channel, Serial, 12-Bit ADCs with 3V Digital Interface

Maxim Integrated 

MAX1202/MAX1203

5V, 8-Channel, Serial, 12-Bit ADCs

with 3V Digital Interface

CS

SCLK

1 2 345678

DIN

SSTRB

DOUT

ADC STATE

SEL2 SEL1 SEL0

UNI/

BIP

SGL/

DIF

PD1

PD0

START

tCONV

ACQUISITION CONVERSION

IDLE

1.5s

(SCLK = 2MHz)

10s MAX

Figure 9. Internal Clock Mode Timing

9 10 11 12

B11

MSB

B10

B9

18 19 20 21 22 23 24

B2

B1

B0

LSB

FILLED WITH

ZEROS

IDLE

CS • • •

SSTRB • • •

SCLK • • •

tCONV

tCSH

tSSTRB

tCSS

tSCK

PD0 CLOCK IN

Figure 10. Internal Clock Mode SSTRB Detailed Timing

NOTE: KEEP SCLK LOW DURING CONVERSION FOR BEST NOISE PERFORMANCE.

lowed by the remaining bits in MSB-first format (Figure

9). CS does not need to be held low once a conversion is

started. Pulling CS high prevents data from being clocked

into the MAX1202/MAX1203 and three-states DOUT, but

it does not adversely affect an internal clock mode con-

version already in progress. When internal clock mode is

selected, SSTRB does not go into a high-impedance state

when CS goes high.

Figure 10 shows SSTRB timing in internal clock mode.

Data can be shifted in and out of the MAX1202/MAX1203

at clock rates up to 2.0MHz, if tACQ is kept above 1.5μs.

Data Framing

CS’s falling edge does not start a conversion on the

MAX1202/MAX1203. The first logic high clocked into

DIN is interpreted as a start bit and defines the first bit

of the control byte. A conversion starts on SCLK’s falling

edge after the eighth bit of the control byte (the PD0 bit)

is clocked into DIN. The start bit is defined as one of the

following:

The first high bit clocked into DIN with CS low anytime

the converter is idle (e.g., after VDD is applied).

or

The first high bit clocked into DIN after bit 5 (B5) of a

conversion in progress appears at DOUT.

If a falling edge on CS forces a start bit before B5

becomes available, the current conversion is terminated

and a new one started. Thus, the fastest the MAX1202/

MAX1203 can run is 15 clocks/conversion.

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