參數(shù)資料
型號： PCM3794RHBRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數(shù)： 54/67頁
文件大小： 1417K
代理商： PCM3794RHBRG4
www.ti.com
f :SamplingFrequency[Hz]
f :CenterFrequency[Hz]
f : BandWidth[Hz]
S
C
b
0dB
–3dB
Frequency – Hz
Amplitude
–
dB
f
C
f
b
(Equation1)
(Equation2)
a = –(1+a )cos
1
2
÷
è
2 f
p
C
f
S
a =
2
1 – tan
÷
è
2 f /f
p
b S
2
1+tan
÷
è
2 f /f
p
b S
2
M0058-01
SLES193C – AUGUST 2006 – REVISED FEBRUARY 2007
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 101
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
S107
S106
S105
S104
S103
S102
S101
S100
Register 102
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
S115
S114
S113
S112
S111
S110
S109
S108
Register 103
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
S207
S206
S205
S204
S203
S202
S201
S200
Register 104
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
S215
S214
S213
S212
S211
S210
S209
S208
IDX[6:0]: 110 0101b (65h): Register 101
IDX[6:0]: 110 0110b (66h): Register 102
IDX[6:0]: 110 0111b (67h): Register 103
IDX[6:0]: 110 1000b (68h): Register 104
S[107:100]: Lower 8 bits of Coefficient a1 for Second-Stage Notch Filter
S[115:108]: Upper 8 bits of Coefficient a1 for Second-Stage Notch Filter
S[207:200]: Lower 8 bits of Coefficient a2 for Second-Stage Notch Filter
S[215:208]: Upper 8 bits of Coefficient a2 for Second-Stage Notch Filter
Default value: 00000000
These bits are used to change the characteristics of the second-stage notch filter. See Figure 38 for details.
The PCM3793/94 provides two notch filters for the digital input to the DAC or the digital output from the ADC.
The optional filter characteristics of each filter are programmable. The characteristics are given by calculating
the coefficients for three parameters, sampling frequency, center frequency, and bandwidth, as shown in
Figure 38. All coefficients must be written as 2s-complement binary data into registers 97, 98, 99, 100, 101, 102,
103, and 104.
Figure 38. Parameter Settings for Notch Filter
The coefficients are calculated using Equation 1 and Equation 2 in Figure 38. An example follows:
fS = 16 kHz, fC = 0.5 kHz, fb = 0.2 kHz
a2 = 0.924390492 → Decimal to Hex → 3B29h
a1 = –1.887413868 → Decimal to Hex → 8735h
a2: F[215:208] = 3Bh, F[207:200] = 29h
a1: F[115:108] = 87h, F[107:100] = 35h
58
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PCM3794RHBTG4 功能描述:接口—CODEC Very Low-Pwr Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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PCM-380 制造商:Panduit Corp 功能描述:
PCM-3810I-AE 制造商:Advantech Co Ltd 功能描述:250 KS/S, 12-BIT, MULTIFUNCTION PCI-10 - Bulk 制造商:Advantech Co Ltd 功能描述:250 kS/s, 12-bit, Multifunction PCI-104 module
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