VOUT R1 RS R
參數(shù)資料
型號: LT1567CMS8
廠商: Linear Technology
文件頁數(shù): 6/16頁
文件大?。?/td> 0K
描述: IC OPAMP/INV BUILDNG BLOCK 8MSOP
標準包裝: 50
類型: ADC 驅(qū)動器
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
14
1567fa
+
R2
VOUT
R1
RS
RP
NOISE AT VOUT IN VRMS = VON IN V/√Hz √fNBW
fNBW = NOISE BANDWIDTH
VON =
IF VSN AND RS = 0
THEN
+ 1
VN
2 +
(VR1
2 + V
SN
2) + V
R2
2 + (I
N R2)
2
VS
CS
1567 AP01
+
()
R2
R1 + RS
2
()
R2
R1 + RS
VON =
+ 1
VN
2 +
VR1
2 + V
R2
2 + (I
N R2)
2
()
R2
R1
2
()R2
R1
VON is the voltage noise density in V/√Hz at the inverter’s
output.
VN is the op amp’s voltage noise density in V/√Hz.
IN is the op amp’s current noise density in A/√Hz.
VSN is the voltage noise density of the input voltage source
VS with source resistance RS. (If VSN is less than one-half
the noise of resistor R1, then the calculation error when
omitting VSN is less than 4.3%.)
VR1 and VR2 is the voltage noise density of the thermal
noise of resistors (R1 + RS) and R2 respectively. Resistor
RS is typically smaller than R1 and is omitted from noise
calculations. The voltage noise density of the thermal
noise of a resistor R is approximately 0.128x
√RnV/√Hz at
25
°C.
The RP resistor noise at the op amp’s plus input is equal
to
√(kT/CS) and is omitted from noise calculations. (If
CS = 0.1F, the RP noise is 0.2VRMS at 25°C, k = 1.38x
10–23 and T = 273
°C + 25°C.)
The noise bandwidth (fNBW) is greater than a circuit’s
–3dB bandwidth. (For a 1st, 2nd or 3rd order Butterworth
filter, fNBW is 1.57x, 1.22x and 1.15x respectively the –
3dB bandwidth.)
VON =
VON = 5.29nV/√Hz
+ 1
(1.4 10–9)2 +
(0.128 10–9
√604)2 + (0.128 10–9 √604)2 + (10–12 604)2
2
()
604
2
()604
604
Example: Calculate VON, the voltage noise density of an
LT1567 op amp inverter for R1 = R2 = 604
. With
VN = 1.4nV/√Hz and IN = 1pA/√Hz.
APPE DIX: OUTPUT OISE OF A OP A P I VERTI G A PLIFIER
U
W
U
W
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