LT1567CMS8#TR Linear Technology, LT1567CMS8#TR Datasheet - Page 14

• Manufacturer Part Number: LT1567CMS8#TR
• Description: IC OPAMP/INV BUILDNG BLOCK 8MSOP
• Manufacturer: Linear Technology
• Type: General Purposer

Specifications of LT1567CMS8#TR

• Applications: Filter
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: LT1567CMS8TR

APPE DIX: OUTPUT OISE OF A OP A P I VERTI G A PLIFIER
LT1567
V
output.
V
I
V
V
the noise of resistor R1, then the calculation error when
omitting V
V
noise of resistors (R1 + R
R
Example: Calculate V
LT1567 op amp inverter for R1 = R2 = 604Ω. With
V
14
V
V
N
ON
N
SN
S
R1
S
N
ON
ON
is the op amp’s current noise density in A/√Hz.
with source resistance R
is the op amp’s voltage noise density in V/√Hz.
is typically smaller than R1 and is omitted from noise
= 1.4nV/√Hz and I
is the voltage noise density of the input voltage source
is the voltage noise density in V/√Hz at the inverter’s
and V
=
= 5.29nV/√Hz
U
SN
R2
( )
604
604
is less than 4.3%.)
is the voltage noise density of the thermal
+ 1 • (1.4 •10
2
ON
N
= 1pA/√Hz.
, the voltage noise density of an
S
) and R2 respectively. Resistor
S
. (If V
–9
U
SN
NOISE AT V
f
V
IF V
THEN
V
NBW
)
ON
ON
2
SN
is less than one-half
=
=
+
= NOISE BANDWIDTH
AND R
( )
(
( )
604
604
R1 + R
R2
R1
OUT
R2
+ 1 • V
S
= 0
IN V
S
+
–
2
+ 1 • V
2
RMS
)
• (0.128 •10
V
N
R
2
S
2
S
= V
+
N
( )
R2
R1
ON
2
U
+
R1
IN V/√Hz • √f
2
(
R1 + R
• V
R2
R1
R
2
1567 AP01
P
S
+ V
)
–9
calculations. The voltage noise density of the thermal
noise of a resistor R is approximately 0.128x√RnV/√Hz at
25°C.
The R
to √(kT/C
C
10
The noise bandwidth (f
–3dB bandwidth. (For a 1st, 2nd or 3rd order Butterworth
filter, f
3dB bandwidth.)
2
–
+
R2
• (V
S
NBW
• √604)
2
–23
W U
= 0.1µF, the R
R1
+ (I
C
R2
S
2
N
P
+ V
and T = 273°C + 25°C.)
NBW
• R2)
resistor noise at the op amp’s plus input is equal
SN
2
S
2
) + V
2
) and is omitted from noise calculations. (If
is 1.57x, 1.22x and 1.15x respectively the –
+ (0.128 • 10
R2
2
+ (I
V
OUT
P
N
noise is 0.2µV
• R2)
U
2
NBW
–9
) is greater than a circuit’s
• √604)
W
RMS
2
at 25°C, k = 1.38x
+ (10
–12
• 604)
1567fa
2