參數(shù)資料
型號： MAXQ3120-FFN+
廠商： Maxim Integrated Products
文件頁數(shù)： 22/33頁
文件大小： 0K
描述： IC MCU 32KB FLASH 80-MQFP
標(biāo)準(zhǔn)包裝： 66
系列： MAXQ®
核心處理器： RISC
芯體尺寸： 16-位
速度： 8MHz
連通性： UART/USART
外圍設(shè)備： LCD，POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： 閃存
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 2.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 2x16b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 80-BQFP
包裝： 托盤
Appendix A: Applying a Lowpass
Filter (LPF) for Application-
Optimized ADC Performance
The MAXQ3120 gives a user application program direct
access to the ADC data stream right after its sinc3 fil-
ters. This unique feature permits the MAXQ3120 to be
optimized for its target applications. With the device’s
8MIPS processing power and the 1-cycle MAC, a linear
FIR filter can be easily computed in the user application
program. This section provides a simple LP FIR filter to
improve the SNR and THD performance of the
MAXQ3120 for the power-metering application.
Filter Specifications and Coefficients
Input signal frequency (fIN) = 60Hz
Sampling frequency (fS) = 20833Hz
Window = hamming
Cutoff frequency (attenuates after 7th harmonic) = 0.06
π
= 625Hz
Cutoff frequency (for 21st harmonic) = 0.18
π = 1875Hz
Transition width = 0.35
π = 3646Hz
Filter length = 23
MAXQ3120
High-Precision ADC
Mixed-Signal Microcontroller
____________________________________________________________________
29
FILTER_COEFFICIENT_0
-19
FILTER_COEFFICIENT_12
21893
FILTER_COEFFICIENT_1
-288
FILTER_COEFFICIENT_13
17547
FILTER_COEFFICIENT_2
-786
FILTER_COEFFICIENT_14
11739
FILTER_COEFFICIENT_3
-1402
FILTER_COEFFICIENT_15
6018
FILTER_COEFFICIENT_4
-1670
FILTER_COEFFICIENT_16
1627
FILTER_COEFFICIENT_5
-876
FILTER_COEFFICIENT_17
-876
FILTER_COEFFICIENT_6
1627
FILTER_COEFFICIENT_18
-1670
FILTER_COEFFICIENT_7
6018
FILTER_COEFFICIENT_19
-1402
FILTER_COEFFICIENT_8
11739
FILTER_COEFFICIENT_20
-786
FILTER_COEFFICIENT_9
17547
FILTER_COEFFICIENT_21
-288
FILTER_COEFFICIENT_10
21893
FILTER_COEFFICIENT_22
-19
FILTER_COEFFICIENT_11
23506
—
FILTER_COEFFICIENT_0
849
FILTER_COEFFICIENT_12
23295
FILTER_COEFFICIENT_1
1420
FILTER_COEFFICIENT_13
21720
FILTER_COEFFICIENT_2
2553
FILTER_COEFFICIENT_14
19291
FILTER_COEFFICIENT_3
4334
FILTER_COEFFICIENT_15
16269
FILTER_COEFFICIENT_4
6754
FILTER_COEFFICIENT_16
12966
FILTER_COEFFICIENT_5
9700
FILTER_COEFFICIENT_17
9700
FILTER_COEFFICIENT_6
12966
FILTER_COEFFICIENT_18
6754
FILTER_COEFFICIENT_7
16269
FILTER_COEFFICIENT_19
4334
FILTER_COEFFICIENT_8
19291
FILTER_COEFFICIENT_20
2553
FILTER_COEFFICIENT_9
21720
FILTER_COEFFICIENT_21
1420
FILTER_COEFFICIENT_10
23295
FILTER_COEFFICIENT_22
849
FILTER_COEFFICIENT_11
23840
—
1) LPF coefficients (up to 21st harmonic). Note that these coefficients have been converted to 16-bit fixed-point
numbers. A shift of 17 places is required after the multiply-accumulate operation.
2) LPF coefficients (up to 7th harmonic). Note that these coefficients have been converted to 16-bit fixed-point
numbers. A shift of 18 places is required after the multiply-accumulate operation.
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