参数资料
型号: LTC6242CGN#TRPBF
厂商: Linear Technology
文件页数: 16/32页
文件大小: 0K
描述: IC OP AMP QUAD R-R 16-SSOP
标准包装: 2,500
放大器类型: 通用
电路数: 4
输出类型: 满摆幅
转换速率: 10 V/µs
增益带宽积: 18MHz
电流 - 输入偏压: 0.2pA
电压 - 输入偏移: 50µV
电流 - 电源: 1.8mA
电流 - 输出 / 通道: 30mA
电压 - 电源,单路/双路(±): 2.8 V ~ 6 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 带卷 (TR)
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 VPIN
1μF
898Ω**
5V
–5V
898Ω**
LSK389
30.1Ω
499Ω**
+
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