Reference Voltage for analog-to-digital conversion. Also, Output of the Reference Buffer Amplifier

(4.096V in the MAX186, 1.638 x REFADJ in the MAX188). Add a 4.7µF capacitor to ground when

using external compensation mode. Also functions as an input when used with a precision external

reference.

Low-Power, 8-Channel,

Serial 12-Bit ADCs

6

________________________________________________________________________________________________

__________________________________________Typical Operating Characteristics

0.30

-0.05

-60

140

POWER-SUPPLY REJECTION

vs. TEMPERATURE

0.00

0.25

TEMPERATURE (°C)

60

0.10

0.05

-40

20

100

0.15

0.20

-20 0

40

80

120

2.456

INTERNAL REFERENCE VOLTAGE

vs. TEMPERATURE

2.452

2.455

TEMPERATURE (°C)

2.454

2.453

-40 -20 0

20 40 60 80 100 120

0.16

0

-60

-20

60

140

CHANNEL-TO-CHANNEL OFFSET MATCHING

vs. TEMPERATURE

0.02

0.12

TEMPERATURE (°C)

20

100

0.10

0.04

-40

0

40

80

120

0.14

0.08

0.06

20

-140

0

66.5kHz

MAX186/MAX188 FFT PLOT – 133kHz

-120

0

-80

-100

-40

-20

-60

ft = 10kHz

fs = 133kHz

33.25kHz

FREQUENCY

ft = 10kHz

PIN

NAME

FUNCTION

1-8

CH0-CH7

Sampling Analog Inputs

9

Negative Supply Voltage. Tie to -5V ±5% or AGND

10

SHDN

11

VREF

Three-Level Shutdown Input. Pulling

SHDN low shuts the MAX186/MAX188 down to 10µA (max)

supply current, otherwise the MAX186/MAX188 are fully operational. Pulling

SHDN high puts the ref-

erence-buffer amplifier in internal compensation mode. Letting

SHDN float puts the reference-buffer

amplifier in external compensation mode.

_____________________________________________________________Pin Description