MAX1137EUA-T Maxim Integrated, MAX1137EUA-T Datasheet - Page 9

• Manufacturer Part Number: MAX1137EUA-T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1137EUA-T

• Number Of Channels: 4/2
• Architecture: SAR
• Conversion Rate: 94.4 KSPs
• Resolution: 10 bit
• Input Type: Single-Ended/Differential
• Snr: Yes
• Interface Type: I2C
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: uMAX
• Maximum Power Dissipation: 362 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: Internal 4.096 V

Figure 2. MAX1138/MAX1139 Functional Diagram
Figure 3. Load Circuit
The MAX1136–MAX1139 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 MAX1136/MAX1137 are
4-channel ADCs, and the MAX1138/MAX1139 are
12-channel ADCs. These devices feature a high-speed
2-wire serial interface supporting data rates up to
SDA
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
_______________________________________________________________________________________
4-/12-Channel, 2-Wire Serial 10-Bit ADCs
Detailed Description
AIN11/REF
V
DD
AIN10
GND
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
SDA
SCL
V
DD
I
I
OL
OH
400pF
V
OUT
CONFIGURATION REGISTER
ANALOG
INPUT
MUX
INPUT SHIFT REGISTER
SETUP REGISTER
REF
4.096V (MAX1138)
2.048V (MAX1139)
T/H
REFERENCE
10-BIT
ADC
CONTROL
1.7MHz. Figure 2 shows the simplified internal structure
for the MAX1138/MAX1139.
The MAX1136–MAX1139 operates from a single supply
and consumes 670µA (typ) at sampling rates up to
94.4ksps. The MAX1137/MAX1139 feature a 2.048V
internal reference and the MAX1136/MAX1138 feature
a 4.096V internal reference. All devices can be config-
ured for use with an external reference from 1V to V
The MAX1136–MAX1139 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 section)
and GND (Table 3). In differential mode, the analog-
input multiplexer connects C
log inputs selected by CS[3:0] (Table 4).
During the acquisition interval the T/H switches are in
the track position and C
LOGIC
T/H
OSCILLATOR
MAX1138
MAX1139
between the analog input selected by
INTERNAL
OUTPUT SHIFT
REGISTER
AND RAM
Analog Input and Track/Hold
T/H
charges to the analog input
T/H
to the “+” and “-” ana-
Power Supply
DD
.
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