MAX1188 Datasheet

IC型号：
MAX1188
PDF描述：
" 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog In...
文件大小：
337.78KB
芯片厂家：
Maxim

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16-Bit, 135ksps, Single-Supply ADCs with

Bipolar Analog Input Range

MAX1177/MAX1178/MAX1188

OUTPUT CODE

11 1111 1111 1111

MAX1177

INPUT RANGE = 0V TO +10V

FULL-SCALE

TRANSITION

+5V

68k鈩?/div>

100k鈩?/div>

MAX1177

MAX1178

MAX1188

REFADJ

11 1111 1111 1110

11 1111 1111 1101

FULL-SCALE RANGE

(FSR) = +10V

00 0000 0000 0011

00 0000 0000 0010

00 0000 0000 0001

00 0000 0000 0000

INPUT VOLTAGE (LSB)

65535

65534 65536

1LSB =

FSR x V

REF

65536 x 4.096

150k鈩?/div>

0.1碌F

Figure 7. MAX1177/MAX1178/MAX1188 Reference Adjust

Circuit

Figure 8. MAX1177 Transfer Function

OUTPUT CODE

11 1111 1111 1111

11 1111 1111 1110

11 1111 1111 1101

10 0000 0000 0001

10 0000 0000 0000

01 1111 1111 1111

00 0000 0000 0011

00 0000 0000 0010

00 0000 0000 0001

MAX1188

INPUT RANGE = -10V TO +10V

FULL-SCALE

TRANSITION

OUTPUT CODE

11 1111 1111 1111

11 1111 1111 1110

11 1111 1111 1101

10 0000 0000 0001

10 0000 0000 0000

01 1111 1111 1111

00 0000 0000 0011

00 0000 0000 0010

00 0000 0000 0001

MAX1178

INPUT RANGE = -5V TO +5V

FULL-SCALE

TRANSITION

FULL-SCALE RANGE

(FSR) = +20V

1LSB =

FSR x V

REF

65536 x 4.096

FULL-SCALE RANGE

(FSR) = +1V

1LSB =

FSR x V

REF

65536 x 4.096

00 0000 0000 0000

+32766 +32768

-32768 -32766

-32767 -32765 -1

+32767

INPUT VOLTAGE (LSB)

00 0000 0000 0000

+32766 +32768

-32768 -32766

-32767 -32765 -1

+32767

INPUT VOLTAGE (LSB)

Figure 9. MAX1188 Transfer Function

Figure 10. MAX1178 Transfer Function

be compromised. To avoid this situation, increase the

acquisition time, use a driving circuit that can settle

within t

ACQ

, or leave the MAX1178/MAX1188 powered

up by setting the voltage at R/C low during the second

falling edge of

CS.

Layout, Grounding, and Bypassing

For best performance, use printed circuit boards. Do

not run analog and digital lines parallel to each other,

and do not lay out digital signal paths underneath the

ADC package. Use separate analog and digital ground

planes with only one point connecting the two ground

systems (analog and digital) as close to the device as

possible.

Route digital signals far away from sensitive analog and

reference inputs. If digital lines must cross analog lines,

do so at right angles to minimize coupling digital noise

onto the analog lines. If the analog and digital sections

share the same supply, isolate the digital and analog

supply by connecting them with a low value (10鈩?

resistor or ferrite bead.

______________________________________________________________________________________

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