參數(shù)資料
型號： LTC6242IGN#PBF
廠商： Linear Technology
文件頁數(shù)： 16/32頁
文件大?。?/td> 0K
描述： IC OP AMP QUAD R-R 16-SSOP
標準包裝： 100
放大器類型： 通用
電路數(shù)： 4
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 10 V/µs
增益帶寬積： 18MHz
電流 - 輸入偏壓： 0.2pA
電壓 - 輸入偏移： 50µV
電流 - 電源： 1.8mA
電流 - 輸出 / 通道： 30mA
電壓 - 電源，單路/雙路(±)： 2.8 V ~ 6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應商設(shè)備封裝： 16-SSOP
包裝： 管件
LTC6240/LTC6241/LTC6242
23
624012fe
Figure 9. Ultralow Noise Chopper Amplier
to achieve an extraordinarily low noise and low DC drift.
The performance of this circuit is suited for the demand-
ing transducer signal conditioning situations such as high
resolution scales and magnetic search coils.
The LTC1799’s output is divided down to form a 2-phase
925Hz square wave clock. This frequency, harmonically
unrelated to 60Hz, provides excellent immunity to harmonic
beating or mixing effects which could cause instabilities.
S1 and S2 receive complementary drive, causing A1 to
see a chopped version of the input voltage. A1’s square
wave output is synchronously demodulated by S3 and
S4. Because these switches are synchronously driven
with the input chopper, proper amplitude and polarity
information is presented to A2, the DC output amplier.
This stage integrates the square wave into a DC voltage,
providing the output. The output is divided down (R2 and
R1) and fed back to the input chopper where it serves as
a zero signal reference. Gain, in this case 1000, is set by
the R1-R2 ratio. Because A1 is AC coupled, its DC offset
and drift do not affect the overall circuit offset, resulting
in the extremely low offset and drift noted. The JFETs
have an input RC damper that minimizes offset voltage
contribution due to parasitic switch behavior, resulting in
the 1μV offset specication.
APPLICATIONS INFORMATION
+
–
+
–
BIAS
10M
1μF
14
15
16
3
2
1
S4
S3
240k
1μF
OUTPUT
A2
LTC6241HV
A1
LTC6241HV
1μF
INPUT
10k
8
7
11
S1
S2
9
6
10
R2
10k
R1
10Ω
NOISE
OFFSET
DRIFT
OPEN-LOOP GAIN
I
= 40nVP-P 0.1Hz TO 10Hz
= 1μV
= 0.05μV/°C
R2
10
= 10
= 500pA
+1
GAIN =
9
0.01μF
1
2
6241 F09
= 0.1% METAL FILM RESISTOR
= 1% METAL FILM RESISTOR
*
**
= LTC201 QUAD
= LSK389
= LINEAR INTEGRATED SYSTEMS
FREMONT, CA
1μF
DIV
RSET
LTC1799
V+
74C90 ÷ 10
18.5kHz
OUT
74C74 ÷ 2
TO
1
POINTS
TO
2
POINTS
Q
54.2k*
TO LTC201 V+ PIN
5V
–5V
5V
925Hz
TO LTC201 V– PIN
1μF
898Ω**
5V
–5V
898Ω**
LSK389
30.1Ω
499Ω**
+
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