MAX1238EEE Maxim Integrated Products, MAX1238EEE Datasheet - Page 9
MAX1238EEE
Manufacturer Part Number
MAX1238EEE
Description
ADC (A/D Converters)
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1237EUA.pdf
(22 pages)
Specifications of MAX1238EEE
Number Of Adc Inputs
12
Architecture
SAR
Conversion Rate
94.4 KSPs
Resolution
12 bit
Interface Type
I2C
Voltage Reference
Internal 4.096 V
Supply Voltage (max)
5 V
Mounting Style
SMD/SMT
Package / Case
QSOP-16
Lead Free Status / Rohs Status
No
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX1238EEE
Manufacturer:
MAXIM/美信
Quantity:
20 000
Company:
Part Number:
MAX1238EEE+
Manufacturer:
Maxim
Quantity:
200
Part Number:
MAX1238EEE+
Manufacturer:
MAXIM/美信
Quantity:
20 000
Company:
Part Number:
MAX1238EEE+T
Manufacturer:
FUJITSU
Quantity:
4 689
Figure 2. MAX1238/MAX1239 Simplified Functional Diagram
Figure 3. Load Circuit
The MAX1236–MAX1239 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 MAX1236/MAX1237 are
4-channel ADCs, and the MAX1238/MAX1239 are 12-
channel ADCs. These devices feature a high-speed, 2-
wire serial interface supporting data rates up to 1.7MHz.
SDA
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
_______________________________________________________________________________________
AIN11/REF
Detailed Description
AIN10
GND
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
SDA
SCL
V
V
DD
DD
I
I
OL
OH
400pF
CONFIGURATION REGISTER
ANALOG
INPUT
V
MUX
INPUT SHIFT REGISTER
OUT
SETUP REGISTER
REF
4.096V (MAX1238)
2.048V (MAX1239)
T/H
REFERENCE
12-BIT
ADC
CONTROL
LOGIC
Figure 2 shows the simplified internal structure for the
MAX1238/MAX1239.
The MAX1236–MAX1239 operates from a single supply
and consumes 670µA (typ) at sampling rates up to
94.4ksps. The MAX1237/MAX1239 feature a 2.048V
internal reference and the MAX1236/MAX1238 feature
a 4.096V internal reference. All devices can be config-
ured for use with an external reference from 1V to V
The MAX1236–MAX1239 analog-input architecture con-
tains an analog-input multiplexer (mux), a fully differen-
tial 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
CS[3:0] (see the Configuration/Setup Bytes (Write Cycle)
section) and GND (Table 3). In differential mode, the
analog-input multiplexer connects C
analog inputs selected by CS[3:0] (Table 4).
During the acquisition interval, the T/H switches are in
the track position and C
T/H
OSCILLATOR
MAX1238
MAX1239
INTERNAL
OUTPUT SHIFT
between the analog input selected by
REGISTER
AND RAM
Analog Input and Track/Hold
T/H
charges to the analog input
T/H
Power Supply
to the “+” and “-”
DD
.
9