Datasheet
MAX11612–MAX11617
Low-Power, 4-/8-/12-Channel, I
2
C,
12-Bit ADCs in Ultra-Small Packages
10
Maxim Integrated
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
external reference from 1V to V
DD
.
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-
nects C
T/H
between the analog input selected by
CS[3:0] (see the
Configuration/Setup Bytes (Write Cycle)
section) and GND (Table 3). In differential mode, the
analog-input multiplexer connects C
T/H
to the + and -
analog inputs selected by CS[3:0] (Table 4).
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
V
DD
GND
MAX11616
MAX11617
Figure 2. MAX11616/MAX11617 Simplified Functional Diagram
V
DD
I
OL
I
OH
V
OUT
400pF
SDA
Figure 3. Load Circuit