MAX11606 Datasheet, PDF(18/22 Page) Maxim Integrated Products – 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/8-/12-Channel, 2-Wire Serial 10-Bit ADCs

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MAX11606 Datasheet, PDF (18/22 Pages) Maxim Integrated Products – 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/8-/12-Channel, 2-Wire Serial 10-Bit ADCs

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2.7V to 3.6V and 4.5V to 5.5V, Low-Power,

4-/8-/12-Channel, 2-Wire Serial 10-Bit ADCs

Table 6. Reference Voltage, AIN_/REF, and REF Format

SEL2

SEL1

X = Donât care.

SEL0

REFERENCE

VOLTAGE

VDD

External reference

Internal reference

AIN_/REF

(MAX11606/

MAX11607/

MAX11610/

MAX11611)

Analog input

Reference input

Analog input

Reference output

REF

(MAX11608/

MAX11609)

INTERNAL

REFERENCE STATE

Not connected

Reference input

Not connected

Reference output

Always off

Always on

Always off

Always on

using an external reference or VDD as a reference, all

analog circuitry is inactive in shutdown and supply cur-

rent is less than 0.5ÂµA (typ). The digital conversion

results obtained in internal clock mode are maintained

in memory during shutdown and are available for

access through the serial interface at any time prior to a

STOP or a repeated START condition.

When idle, the MAX11606âMAX11611 continuously wait

for a START condition followed by their slave address (see

Slave Address section). Upon reading a valid address

byte the MAX11606âMAX11611 power-up. The internal

reference requires 10ms to wake up, so when using the

internal reference it should be powered up 10ms prior to

conversion or powered continuously. Wake-up is invisible

when using an external reference or VDD as the reference.

Automatic shutdown results in dramatic power savings,

particularly at slow conversion rates and with internal

clock. For example, at a conversion rate of 10ksps, the

average supply current for the MAX11607 is 60ÂµA (typ)

and drops to 6ÂµA (typ) at 1ksps. At 0.1ksps the average

supply current is just 1ÂµA, or a minuscule 3ÂµW of power

consumption, see Average Supply Current vs. Conversion

Rate in the Typical Operating Characteristics).

Reference Voltage

SEL[2:0] of the setup byte (Table 1) control the reference

and the AIN_/REF configuration (Table 6). When

AIN_/REF is configured to be a reference input or refer-

ence output (SEL1 = 1), differential conversions on

AIN_/REF appear as if AIN_/REF is connected to GND

(see note 2 of Table 4). Single-ended conversion in scan

mode on AIN_/REF is ignored by internal limiter, which

sets the highest available channel at AIN2 or AIN10.

Internal Reference

The internal reference is 4.096V for the MAX11606/

MAX11608/MAX11610 and 2.048V for the MAX11607/

MAX11609/MAX11611. SEL1 of the setup byte controls

whether AIN_/REF is used for an analog input or a refer-

ence (Table 6). When AIN_/REF is configured to be an

internal reference output (SEL[2:1] = 11), decouple

resistor (see the Typical Operating Circuit). Once powered

up, the reference always remains on until reconfigured.

The internal reference requires 10ms to wake up and is

accessed using SEL0 (Table 6). When in shutdown, the

internal reference output is in a high-impedance state. The

reference should not be used to supply current for exter-

nal circuitry. The internal reference does not require an

OUTPUT CODE

11 . . . 111

11 . . . 110

11 . . . 101

FULL-SCALE

TRANSITION

MAX11606â

MAX11611

00 . . . 011

00 . . . 010

00 . . . 001

00 . . . 000

012 3

INPUT VOLTAGE (LSB)

Figure 12. Unipolar Transfer Function

FS = VREF

ZS = GND

1 LSB = VREF

1024

FS - 3/2 LSB

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