Detailed Description

The MAX11612–MAX11617 analog-to-digital converters

(ADCs) use successive-approximation conversion tech-

niques and fully differential input track/hold (T/H) cir-

cuitry to capture and convert an analog signal to a

serial 12-bit digital output. The MAX11612/MAX11613

are 4-channel ADCs, the MAX11614/MAX11615 are

8-channel ADCs, and the MAX11616/MAX11617 are

12-channel ADCs. 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 MAX11616/MAX11617.

Power Supply

The MAX11612–MAX11617 operate from a single sup-

ply and consume 670µA (typ) at sampling rates up to

94.4ksps. The MAX11613/MAX11615/MAX11617 fea-

ture a 2.048V internal reference and the MAX11612/

MAX11614/MAX11616 feature a 4.096V internal refer-

ence. All devices can be configured for use with an

Analog Input and Track/Hold

The MAX11612–MAX11617 analog-input architecture

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

ferential track-and-hold (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-

CS[3:0] (see the

Configuration/Setup Bytes (Write Cycle)

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

analog inputs selected by CS[3:0] (Table 4).

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

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

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9

ANALOG

INPUT

MUX

AIN1

AIN11/REF

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

AIN8

AIN9

AIN10

AIN0

SCL

SDA

INPUT SHIFT REGISTER

SETUP REGISTER

CONFIGURATION REGISTER

CONTROL

LOGIC

REFERENCE

4.096V (MAX11616)

2.048V (MAX11617)

INTERNAL

OSCILLATOR

OUTPUT SHIFT

REGISTER

AND RAM

REF

T/H

12-BIT

ADC

GND

MAX11616

MAX11617

Figure 2. MAX11616/MAX11617 Simplified Functional Diagram

400pF

SDA

Figure 3. Load Circuit