MAX11138ATI+ Maxim Integrated, MAX11138ATI+ Datasheet - Page 19

• Manufacturer Part Number: MAX11138ATI+
• Description: Analog to Digital Converters - ADC 500ksps, Low-Power, Serial 12-/10-/8-Bit
• Manufacturer: Maxim Integrated

Specifications of MAX11138ATI+

• Rohs: yes
• Number Of Channels: 4/2
• Architecture: SAR
• Conversion Rate: 500 kSPs
• Resolution: 10 bit
• Input Type: Single-Ended/Differential
• Snr: 61.7 dB
• Interface Type: 3-Wire, QSPI, SPI
• Operating Supply Voltage: 2.35 V to 3.6 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-28
• Maximum Power Dissipation: 2758 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: 1 V

Figure 2c. External Clock Timing Diagram with CHAN_ID=0
The MAX11135–MAX11143 include up to 16 analog input
channels that can be configured to 16 single-ended
inputs, 8 fully differential pairs, or 15 pseudo-differential
inputs with respect to one common input (REF-/AIN15 is
the common input).
The analog input range is 0V to V
and pseudo-differential mode (unipolar) and QV
QV
the RANGE register settings. See
register setting.
Unipolar mode sets the differential input range from 0
to V
negative analog input in unipolar mode, the digital output
code is zero. Selecting bipolar mode sets the differential
input range to QV
RANGE register settings
In single-ended mode, the ADC always operates in uni-
polar mode. The analog inputs are internally referenced
to GND with a full-scale input range from 0 to V
Single-ended conversions are internally referenced to
GND
The MAX11135–MAX11143 feature 15 pseudo differen-
tial inputs by setting the PDIFF_COM bits in the Unipolar
register to 1
inputs are referenced to a DC signal applied to the
REF-/AIN15.
DOUT
SCLK
REF+
DIN
REF+
CS
(Figure
in fully differential mode (bipolar) depending on
. If the positive analog input swings below the
3).
(Table
1
DI[15]
0
REF+
and Pseudo-Differential Input
2
MSB] MSB-1 MSB-2
10). The 15 analog input signals
DI[14]
Single-Ended, Differential,
/2 or QV
500ksps, Low-Power, Serial 12-/10-/8-Bit,
(Table
3
4
REF+
7).
Table 7
REF+
5
depending on the
in single-ended
6
for the RANGE
7
REF+
8
REF+
/2 or
9
.
10
Figure 3. Equivalent Input Circuit
When the reference is used in fully differential mode
(REFSEL = 1), the full-scale range is set by the difference
between REF+ and REF-. The output clips if the input
signal surpasses this reference range.
The output format of the MAX11135–MAX11143 is straight
binary in unipolar mode and two’s complement in bipolar
mode. The code transitions midway between successive
integer LSB values, such as 0.5 LSB, 1.5 LSB.
and
tion, respectively. Output coding is binary, with 1 LSB =
V
REF+
11
Figure 5
Fully Differential Reference (REF+, REF-)
MAX11135–MAX11143
4-/8-/16-Channel ADCs
/4096.
12
AINn+1
(GND)
AINn
show the unipolar and bipolar transfer func-
13
LSB
HOLD
14
0
15
DI[1]
ADC Transfer Function
16
DAC
DAC
DI[0]
COMPARATOR
Figure 4
19