MAX11359AETL Maxim Integrated, MAX11359AETL Datasheet - Page 30

• Manufacturer Part Number: MAX11359AETL
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX11359AETL

• Number Of Channels: 10
• Architecture: Sigma-Delta
• Conversion Rate: 10 SPs to 512 SPs
• Resolution: 16 bit
• Input Type: Differential
• Interface Type: 4-Wire Serial, Microwire, QSPI, SPI
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Power Dissipation: 2051.3 mW
• Number Of Converters: 1
• Voltage Reference: 1.251 V 1.996 V, 2.422 V

Program each UPIO1–UPIO4 as one of the following:
• General-purpose input
• Power-mode control
• Analog switch (SPST) and SPDT control input
• ADC data-ready output
• General-purpose output
• PWM output
• Alarm output
• SPI passthrough
The internal temperature sensor measures die tempera-
ture, and the external temperature sensor measures
remote temperatures. Use the internal temperature sen-
sor or external temperature sensor (remote transistor/
diode) with the ADC and internal current sources to
measure the temperature. For either method, two to four
currents are passed through a p-n junction and sense
resistor, and its temperature is calculated by a µC
using the diode equation and the forward-biased junc-
tion voltage drops measured by the ADC. The tempera-
ture offset between the internal p-n junction and
ambient is negligible. For the four and eight measure-
ment methods, the ratio of currents used in the diode
calculations is precisely known since the ADC mea-
sures the resulting voltage across the same sense
resistor. See Figure 13 for a block diagram of the tem-
perature sensor.
16-Bit Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
MAX11359A
Figure 12. High-Frequency Clock and FLL Block Diagram
30
M32K
FLLE
FREQUENCY
COMPARE
Temperature Sensors
ERROR
FREQ
32.768kHz
INTEGRATOR
FREQUENCY
TUNE<8:0>
CONTROLLED
OSCILLATOR
DIGITALLY
HFCE
Figure 13. Temperature-Sensor Measurement Block Diagram
AIN1
AIN2
CKSEL2
0
1
MUX
2:1
4.9152MHz HF OSCILLATOR AND FLL
IMUX<1:0>
IVAL<1:0>
CKSEL<1:0>
4.9152MHz
1, 2, 4, 8
DIVIDER
PROGRAMMABLE CURRENT SOURCE
TEMP SENSOR
CURRENT
SOURCE
DEMUX
CLKE
1:3
CRDY
HFCLK
Maxim Integrated
AIN1
AIN2
TEMP+
TEMP-
CLK