MAX11647EUA+T【PDF 2/22 页】IC ADC 10BIT I2C 94.4KSPS 8UMAX

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MAX11646/MAX11647

Low-Power, 1-/2-Channel, I2C, 10-Bit ADCs

in Ultra-Tiny 1.9mm x 2.2mm Package

______________________________________________________________________________________

Detailed Description

The MAX11646/MAX11647 ADCs use successive-

approximation conversion techniques and fully differen-

tial input T/H circuitry to capture and convert an analog

signal to a serial 10-bit digital output. The

MAX11646/MAX11647 measure either two single-

ended inputs or one differential input. These devices

feature a high-speed, 2-wire serial interface supporting

data rates up to 1.7MHz. Figure 2 shows the simplified

internal structure for the MAX11646/MAX11647.

Power Supply

The MAX11646/MAX11647 operate from a single supply

and consume 670A (typ) at sampling rates up to

94.4ksps. The MAX11647 features a 2.048V internal ref-

erence and the MAX11646 features a 4.096V internal ref-

erence. These devices can be configured for use with an

external reference from 1V to VDD.

Analog Input and Track/Hold

The MAX11646/MAX11647 analog input architecture

contains an analog input multiplexer (mux), a fully dif-

ferential T/H capacitor, T/H switches, a comparator,

and a fully differential switched capacitive digital-to-

analog converter (DAC) (Figure 4).

In single-ended mode, the analog-input multiplexer con-

nects CT/H between the analog input selected by CS0

(see the

Configuration/Setup Bytes (Write Cycle) sec-

tion) and GND (Table 3). In differential mode, the analog

input multiplexer connects CT/H to the + and - analog

inputs selected by CS0 (Table 4).

During the acquisition interval, the T/H switches are in

the track position and CT/H charges to the analog input

signal. At the end of the acquisition interval, the T/H

switches move to the hold position retaining the charge

on CT/H as a stable sample of the input signal.

ANALOG

INPUT

MUX

AIN1

REF

AIN0

SCL

SDA

INPUT SHIFT REGISTER

SETUP REGISTER

CONFIGURATION REGISTER

CONTROL

LOGIC

REFERENCE

4.096V (MAX11646)

2.048V (MAX11647)

INTERNAL

OSCILLATOR

OUTPUT SHIFT

AND RAM

REF

T/H

10-BIT

ADC

VDD

GND

MAX11646

MAX11647

Figure 2. Functional Diagram

VDD

IOL

IOH

VOUT

400pF

SDA

Figure 3. Load Circuit

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