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ST70136 Datasheet(PDF) 5 Page - STMicroelectronics |
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ST70136 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 24 page ST70136 5/24 2 - PIN DESCRIPTION 2.1 - Analog Power Supplies These pins are the positive analog power supply voltage for the DAC and the ADC section. It is not internally connected to digital supply. In any case the voltage on these pins must be higher or equal to the voltage of the Digital power supply. 2.2 - Digital Power Supplies These pins are the power supply pins that are used by the internal digital circuitry. All DVDD pins must be connected together to a +3.3 V supply. 2.3 - Analog Ground and Substrate These pins are the ground return of the analog DAC and ADC blocks. The analog VDDA should be decoupled with respect to the analog ground. Decoupling capacitors should be as close as pos- sible to the supplies pins. All grounds must be tied together. 2.4 - Digital Ground These pins are the ground return of the digital cir- cuitry. The digital power supplies must should be decoupled with respect to the digital ground. Decoupling capacitors should be as close as pos- sible to the supplies pins. All grounds must be tied together. 2.5 - Powerdown - PWD When pin PWD =”1”, the chip is set in low power mode. 2.6 - Suspend The SUSPEND pin is used to control the output of CLKM. When SUSPEND is low CLKM output is enabled otherwise CLKM is disabled. 2.7 - Reset The reset function is implied when the NRESET pin is at a low voltage input level. In this condition, the reset function can be easily used for power up reset conditions. Reset is asynchronous, tenths of ns are enough to put the IC in reset. After reset, all registers are set to their default value. 2.8 - Reference Voltages 2.8.1 - V125AD, V250AD, V375AD These pins are used to externally decouple the internal reference voltages used for the ADC (1.25V, 2.5V, 3.75V). 2.8.2 - V3P75V This pin is the 3.75V Bandgap output and should be externally decoupled with an external capacitor of 0.22uF. 2.8.3 - IREF50U This pin is used for setting the bias current and must be externally connected to a resistor of 2.5V / 50 µA equals 50k Ω. 2.8.4 - V290DA This pin is the 2.9V transmit DAC output reference voltage and must be decoupled externally. 2.9 - Analog Transmit Output 2.9.1 - TXP This pin is the non-inverting output of the fully dif- ferential analog amplifier. 2.9.2 - TXN This pin is the inverting output of the fully differen- tial analog amplifier. 2.9.3 - TXIP This pin is the differential non-inverting input for external filtering. 2.9.4 - TXIN This pin is the differential inverting input for exter- nal filtering. 2.9.5 - PGAP This pin is the differential non-inverting PGA out- put. 2.9.6 - PGAN This pin is the differential inverting PGA output. 2.10 - Analog Receive Input 2.10.1 - RXN This pin is the differential inverting receive input. 2.10.2 - RXP This pin is the differential non-inverting receive input. 2.11 - Tone Detector The analog input differential signal must be less than 8V peak to peak. These pins are used for activity detection when in sleeping mode. 2.11.1 - TON This pin is the differential inverting tone detector input. |
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