MAX1109EUB Maxim Integrated, MAX1109EUB Datasheet - Page 13

• Manufacturer Part Number: MAX1109EUB
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1109EUB

• Number Of Channels: 2
• Architecture: SAR
• Conversion Rate: 50 KSPS
• Resolution: 8 bit
• Input Type: Single-Ended/Pseudo-Differential
• Snr: Yes
• Interface Type: 4-Wire (SPI, Microwire), QSPI
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: uMAX-10
• Maximum Power Dissipation: 444 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: 4.096 V

Table 1. Control Byte Format
Table 2. Conversion Configuration
Table 3. Full- and Zero-Scale Voltages
*RI = Reference Input (Table 2)
7 (MSB)
0 (LSB)
(MSB)
START
SEL2
BIT 7
BIT
1
1
1
1
0
0
0
0
6
5
4
3
2
1
Zero Scale
RI*
UNIPOLAR MODE
REFSHDN
______________________________________________________________________________________
SEL1
START
I/ECLK
NAME
I/EREF
SHDN
BIT 6
SEL2
SEL2
SEL1
SEL0
1
1
0
0
1
1
0
0
The first logic “1” bit after CS goes low defines the beginning of the control byte.
Selects the mode of operation (Table 2).
1 = external clock, 0 = internal clock. The SAR can be driven by the internal oscillator, or with the
SCLK signal.
1 = internal reference, 0 = external reference. Internal reference selects +2.048V (MAX1108) or
+4.096V (MAX1109), or an external reference can be applied to the REF pin.
1 = operational (if I / EREF = 1), 0 = reference shutdown. When using an external reference, power
consumption can be minimized by powering down the internal reference separately (I / EREF = 0).
REFSHDN must be set to 0 when SHDN = 0.
1 = operational, 0 = power down. For a full power down set REFSHDN = SHDN = 0. (See Power-
Down Mode section.)
Full Scale
RI + V
SEL0
BIT 5
SEL1
1
0
1
0
1
0
1
0
REF
SAMPLED INPUT
2-Channel, Serial 8-Bit ADCs
BIT 4
SEL0
V
CH0
CH1
CH0
CH1
CH0
CH1
CH0
DD
RI - V
Single-Supply, Low-Power,
(SI)
Full Scale
Negative
/ 2
REF
/ 2
I/ECLK
BIT 3
DESCRIPTION
REFERENCE INPUT
BIPOLAR MODE
COM
COM
GND
GND
COM
COM
GND
CH1
(RI)
I/EREF
BIT 2
Scale
Zero
RI
REFSHDN
BIT 1
CONVERSION MODE
RI + V
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Full Scale
Bipolar
Bipolar
Bipolar
Positive
REF
SHDN
(LSB)
BIT 0
/ 2
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