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參數(shù)資料
| 型號： | AFE031AIRGZT |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 19/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AFE POWERLINE COMM 48VQFN |
| 特色產(chǎn)品： | An Intelligent Solar Micro-Inverter Solution |
| 標準包裝： | 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 |
| 供應(yīng)商設(shè)備封裝： | 48-VQFN 裸露焊盤（7x7） |
| 包裝： | 標準包裝 |
| 其它名稱： | 296-29692-6 |
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C
C1
C2
R1
R2
1
2
f
p
R
IN,PGA1
C =
L1
L2
From line coupling circuit
To Rx PGA1
See Note (1)
C
1
2
f
p
R
IN,PGA2
C =
2
Rx C1
Rx C2
330 W
To ADC input on MCU
From line coupling circuit
or passive bandpass filter
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 Filter is a very low noise, unity-gain, fourth-order low-pass filter. The Rx Filter cutoff frequency is
selectable between CENELEC A or CENELEC B, C, and D modes. The Control1 Register bit location 3 setting
(CA CBCD) determines the cutoff frequency. Setting Control1 Register bit location 3 to '0' selects the CENELEC
A band; setting Control1 Register bit location 3 to '1' selects the CENELEC B, C, and D bands. Because the Rx
Filter is a very low noise analog filter, two external capacitors are required to properly configure the Rx Filter.
Table 3 shows the proper capacitance values for CENELEC A, B, C, and D bands. Capacitor Rx C1 is connected
between pin 24 and ground, and Rx C2 is connected between pin 23 and ground. For the capacitors shown, it is
recommended that these components be rated to withstand the full AVDD power-supply voltage
Table 3. Recommended External Capacitors Required for Rx Filter
FREQUENCY BAND
Rx C1, PIN 24
Rx C2, PIN 23
CUTOFF FREQUENCY (kHz)
CENELEC A
680 pF
90
CENELEC B, C, D
270 pF
560 pF
145
Figure 32 illustrates the recommended connections for the Rx signal chain.
(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 32. Recommended Connections for Rx Signal Chain
As Figure 33 shows, a fourth-order passive passband filter is optional but recommended for applications where
high performance is required. The external passive passband filter removes any unwanted, out-of-band signals
from the signal path, and prevents them from reaching the active internal filters within the AFE031.
(1)
For capacitor value C, f is the desired lower cutoff frequency and RIN,PGA1 is the input resistance of Rx PGA1. Refer
to Table 3.
Figure 33. Passive Bandpass Rx Filter
26
Copyright 2010–2012, Texas Instruments Incorporated
Product Folder Link(s): AFE031
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