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| 型号： | AFE031AIRGZT |
| 厂商： | Texas Instruments |
| 文件页数： | 18/57页 |
| 文件大小： | 0K |
| 描述： | IC AFE POWERLINE COMM 48VQFN |
| 特色产品： | An Intelligent Solar Micro-Inverter Solution |
| 标准包装： | 1 |
| 位数： | 10 |
| 通道数： | 1 |
| 电压 - 电源，模拟： | 3 V ~ 3.6 V |
| 电压 - 电源，数字： | 3 V ~ 3.6 V |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-VQFN 裸露焊盘（7x7） |
| 包装： | 标准包装 |
| 其它名称： | 296-29692-6 |
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C
LPF
PGA
PA
1
2
f 22 k
p
W
C =
Note (3)
Tx_F_OUT
Tx_PGA_
IN
PA_OUT1
PA_OUT2
Tx_PGA_
OUT
PA_IN
C
Inside the AFE031
510 W
Note (2)
MCU
Tx_F_IN1
Tx_F_IN2
GPIO
Note (1)
43 kW
SBOS531D – AUGUST 2010 – REVISED MAY 2012
(1)
When using both Tx Filter inputs, use 43-k
Ω resistors to match the input resistance for best frequency response.
(2)
Refer to Table 2.
(3)
For capacitor value C, f is the desired lower cutoff frequency and 22 k
Ω is the PA input resistance.
Figure 31. Recommended Tx Signal Chain Connections in PWM Mode
Using Two PWM Signals and Additional RC Filters
For the capacitors listed in Table 2, it is recommended that these components be rated to withstand the full AVDD
power-supply voltage.
Table 2. Recommended External R and C Values to
Increase Tx Filter Response Order in PWM
Applications
FREQUENCY BAND
R (
Ω)
C (nF)
SFSK: 63 kHz, 74 kHz
510
2.7
CENELEC A
510
1.5
CENELEC B, C, D
510
1
The Tx PGA and Tx Filter each have the inputs and outputs externally available in order 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 from the outputs
to ground, less than 100 pF is recommended.
Rx Block
The Rx block consists of Rx PGA1, the Rx Filter, and Rx PGA2. Both Rx PGA1 and Rx PGA2 are high-
performance programmable gain amplifiers. Rx PGA1 can be configured through the SPI to operate as either an
attenuator or in gain. The gain steps of the Rx PGA1 are 0.25 V/V, 0.5 V/V, 1 V/V, and 2 V/V. The gain steps of
the Rx PGA2 are 1 V/V, 4 V/V, 16 V/V, and 64 V/V. Configuring the Rx PGA1 as an attenuator (at gains less
than 1 V/V) is useful for applications where the presence of large interference signals are present within the
signal band. Attenuating the large interference allows these signals to pass through the analog Rx signal chain
without causing an overload; the interference signal can then be processed and removed within the
microprocessor as necessary.
Copyright 2010–2012, Texas Instruments Incorporated
25
Product Folder Link(s): AFE031
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