MAX1203ACAP-T 查看數據表（PDF） - Maxim Integrated

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MAX1203ACAP-T

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

OUTPUT CODE

11 . . . 111

11 . . . 110

11 . . . 101

FULL-SCALE

TRANSITION

FS = +4.096V

1LSB = + 4.096V

4096

00 . . . 011

00 . . . 010

00 . . . 001

00 . . . 000

012 3

INPUT VOLTAGE (LSBs)

FS

FS - 3/2LSB

Figure 15. Unipolar Transfer Function, 4.096V = Full Scale

OUTPUT CODE

011 . . . 111

011 . . . 110

000 . . . 010

000 . . . 001

000 . . . 000

111 . . . 111

111 . . . 110

111 . . . 101

FS = +2.048V

1LSB

=

+4.096V

4096

100 . . . 001

100 . . . 000

-FS

0V

INPUT VOLTAGE (LSBs)

+FS - 1LSB

Figure 16. Bipolar Transfer Function, ±4.096V/2 = Full Scale

(“star” ground point) at GND. Connect all other analog

grounds to this ground. No other digital system ground

should be connected to this single-point analog ground.

The ground return to the power supply for this ground

should be low impedance and as short as possible for

noise-free operation.

High-frequency noise in the power supplies can affect the

ADC’s high-speed comparator. Bypass these supplies

to the single-point analog ground with 0.1μF and 4.7μF

bypass capacitors close to the MAX1202/MAX1203.

Minimize capacitor lead lengths for best supply-noise

rejection. If the +5V power supply is very noisy, a 10Ω

resistor can be connected as a lowpass filter, as shown

in Figure 18.

+5V

100kΩ

510kΩ

24kΩ

0.01µF

MAX1202

REFADJ

12

Figure 17. MAX1202 Reference-Adjust Circuit

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