IN,PGA2 C = 2 Rx C1 Rx C2 330 W To ADC inpu" />
參數(shù)資料
型號(hào)： AFE031AIRGZT
廠商： Texas Instruments
文件頁(yè)數(shù)： 21/57頁(yè)
文件大?。?/td> 0K
描述： IC AFE POWERLINE COMM 48VQFN
特色產(chǎn)品： An Intelligent Solar Micro-Inverter Solution
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 10
通道數(shù)： 1
電壓 - 電源，模擬： 3 V ~ 3.6 V
電壓 - 電源，數(shù)字： 3 V ~ 3.6 V
封裝/外殼： 48-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 48-VQFN 裸露焊盤(pán)（7x7）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： 296-29692-6
C3
C4
R2
R3
L1
L2
From line coupling
circuit
C
1
2
f
p
R
IN,PGA2
C =
2
Rx C1
Rx C2
330 W
To ADC
input on MCU
LPF
PGA
Note (2)
Inside the AFE031
Rx_PGA1_OUT
Rx_F_IN
Rx_PGA1_
IN
Rx_PGA2_
OUT
Rx_F_
OUT
RX_PGA2_IN
C
2
1
2
f
p
R
IN,PGA1
C =
1
Note (1)
Rx_C1
Rx_C2
See Note (3)
SBOS531D – AUGUST 2010 – REVISED MAY 2012
The Rx PGA1, Rx Filter, and Rx PGA2 components have all inputs and outputs externally available to provide
maximum system design flexibility. Care should be taken when laying out the PCB traces from the inputs or
outputs to avoid excessive capacitive loading. Keeping the PCB capacitance from the inputs to ground, or
outputs to ground, below 100 pF is recommended.
Figure 34 shows the complete Rx signal path, including the optional passive passband filter.
(1)
For capacitor value C1,f is the desired lower cutoff frequency and RIN,PGA1 is the input resistance of Rx PGA1.
(2)
For capacitor value C2,f is the desired lower cutoff frequency and RIN,PGA2 is the input resistance of Rx PGA2.
(3)
Refer to Table 3.
Figure 34. Complete Rx Signal Path (with Optional Bandpass Filter)
DAC Block
The DAC block consists only of the 10-bit DAC. The use of the DAC is recommended for best performance. The
serial interface is used to write directly to the DAC registers when the DAC pin (pin 7) is driven high. Placing the
DAC pin into a high state configures the SPI for direct serial interface to the DAC. Use the following sequence to
write to the DAC:
Set CS low.
Set the DAC pin (pin 7) high.
Write a 10-bit word to DIN. The DAC register is left-justified and truncates more than 10 bits.
CS high updates the DAC.
Refer to Figure 35 for an illustration of this sequence.
28
Copyright 2010–2012, Texas Instruments Incorporated
Product Folder Link(s): AFE031
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