參數(shù)資料
型號(hào): LT1567CMS8
廠商: Linear Technology
文件頁(yè)數(shù): 16/16頁(yè)
文件大?。?/td> 0K
描述: IC OPAMP/INV BUILDNG BLOCK 8MSOP
標(biāo)準(zhǔn)包裝: 50
類型: ADC 驅(qū)動(dòng)器
應(yīng)用: 濾波器
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 管件
LT1567
9
1567fa
The simple-to-use spreadsheet requires the user to de-
fine the desired corner (or center) frequency, the pass-
band gain and a capacitor value for a choice of second or
third order Chebyshev or Butterworth lowpass or second
order bandpass filters.
The spreadsheet outputs the required external standard
component values and provides a circuit diagram.
Signal Ground
Both operational amplifiers within the LT1567 are de-
signed for inverting operation (constant common mode
APPLICATIO S I FOR ATIO
WU
U
input) and they share a single reference node on the chip.
Two pins permit access to this node: DC BIAS and
BYPASS. For a clean reference over a wide bandwidth, the
normal procedure is to connect DC BIAS to a DC potential
or ground and BYPASS to a decoupling capacitor that
returns to a ground plane.
Differential Output Feature
The multiple feedback filter section of Figure 1 inherently
includes two outputs of opposite signal polarity: a DC
inverting output from the OA (Pin 1) and a DC noninverting
DESIGN EQUATIONS FOR fCENTER ≤ 1MHz
fCENTER IS THE FILTER’S CENTER FREQUENCY
fCENTER =
√GN + 1
2
π R2 C1
MAXIMUM fCENTER = 5MHz/GAIN
GN IS GAIN AT fCENTER = R3/R1, R2 = R3, C1 = C2
C1
≤ √
GN + 1
2500 fC
R3 =
√GN + 1
2
π C1 fCENTER
–3dB BANDWIDTH =
fCENTER
√GN + 1
+
+
7
VOUT
+
VOUT
6
600
600
2
1
C1
3
5
8
VIN
LT1567
0.1
F
7pF
C2
R3
150
V+
R1
R2
0.1
F
4
V
0.1
F
1567 F02a
FREQUENCY (Hz)
50k
–15
GAIN
(dB)
–5
5
25
500k
5M
1567 F02b
15
–10
0
20
10
GAIN IS MEASURED TO EITHER OUTPUT ALONE.
IF OUTPUT USED DIFFERENTIALLY, VOUT
+ – V
OUT
= 2× VIN
Figure 2. 2nd Order Bandpass Filter and Gain Response for fC = 500kHz,
Gain = 10 (C1 = C2 = 1000pF, R2 = R3 = 1.05k, R1 = 105
)
Gain vs Frequency
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