DVK90129 Melexis Inc, DVK90129 Datasheet - Page 40

• Manufacturer Part Number: DVK90129
• Description: DEVELOPMENT KIT MLX90129
• Manufacturer: Melexis Inc
• Series: -r
• Type: Development kitr

Specifications of DVK90129

• Contents: Board, Proxima RF™ Desktop Reader
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: MLX90129

Sensor supplies & Resistor network
Many combinations of resistors connections with the external sensors are possible. All the switches figured
on the following schematic are independently programmable via register #1A. The supply VREF is the
stabilized output of the voltage regulator. The configuration register #19 is used to connect an external sensor
or internal resistance to the inputs of the analogical chain (called MUX OUT1 and MUX OUT2).
Input multiplexer
This block allows selecting the sensor signal which will be connected to the first amplifier of the signal
conditioner. It is possible to select the external sensor(s) connected to SENS1, SENS2, SENS3 and SENS4,
or the internal temperature sensor.
Programmable amplifier 1 (PGA1)
This block is the first programmable amplifier of the analog chain. It has a wide range of gain and is fully
differential. It is compliant with a wide range of input common-mode voltage.
Where:
Gain1 is the gain of the Programmable Amplifier 1
D/A converter (DAC)
This block is used to compensate the offset of the sensor and of PGA1, amplified by PGA1. It is also used to
choose the value of the physical sensed value, for which the ADC will give its middle code.
3901090129
Rev 007
PGA1_Out = Gain1 *
PGA1_Out is the differential output voltage of the Programmable Amplifier 1
PGA1_In
13.56MHZ SENSOR TAG / DATALOGGER IC
Page 40 of 56
MLX90129
Data Sheet
March 2011