参数资料
| 型号： | LTC6244IMS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | IC OP AMP DUAL R-R 8-MSOP |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 35 V/µs |
| 增益带宽积： | 50MHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 40µV |
| 电流 - 电源： | 6.25mA |
| 电流 - 输出 / 通道： | 35mA |
| 电压 - 电源，单路/双路(±)： | 2.8 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
LTC6244
21
6244fb
A Low Noise AC Difference Amplier
In the signal conditioning of wideband sensors and trans-
ducers, a low noise amplier is often used to provide gain
for low level AC difference signals in the frequency range
of a few Hertz to hundreds of kilo-Hertz. In addition, the
amplier must reject common mode AC signals and its input
impedance should be higher than the differential source
impedance. Typical applications are piezoelectric sensors
used in sonar, sound and ultrasound systems and LVDT
(linear variable differential transformers) for displacement
measurements in process control and robotics.
The Figure 11a circuit is a low noise, single supply AC
difference amplier. The amplier’s low frequency –3dB
bandwidth is set with resistor R5 and capacitor C3, while
the upper –3dB bandwidth is set with R2 and C1. The
input common mode DC voltage can vary from ground to
V+ and the output DC voltage is equal to the VREF voltage.
The amplier’s gain is the ratio of resistors R2 to R1 (R4
= R2 and R3 = R1). The component values in the circuit
of Figure 11a implement an 800Hz to 160kHz AC ampli-
er with a gain equal to 10 and 12nV/√Hz input referred
voltage noise density shown in Figure 11b. The total input
referred wideband noise is 4.5μVRMS, in the bandwidth of
500Hz to 200kHz.
Input Impedance = 2 R
IN
Gain =
V
OUT
+ –V
OUT
–
V
IN
+ –V
IN
–
=
R
G
R
IN
Maximum Gain =
5MHz
f
3dB
C
F =
1
4398 f
3dB Gain + 2
()
C
IN =
Gain + 2
8.977 Gain R
IN f3dB
f
3dB =
1
4000 π
2 R
G CF CIN
Figure 9b. Design Equations for Figure 9a Circuit
Figure 10. Differential Input Referred Noise
Figure 9a. Low Noise Fully Differential Buffer/Amplier
(f–3dB = 970kHz, Gain = 5, RIN = 4k)
APPLICATIONS INFORMATION
2k
VIN
+
RG
10k
RIN
2k
RIN
2k
CIN
82pF
CIN
82pF
CF
33pF
CF
33pF
–
+
1/2
LTC6244
VOUT
+
–
+
1/2
LTC6244
VOUT
–
2k
6244 F09a
V+
V–
2k
RG
10k
VIN
–
32
28
24
20
16
12
8
10k
100k
FREQUENCY (Hz)
6244 F10
1M
4
INPUT
REFERRED
NOISE
(nV/√
Hz
)
f–3dB = 970kHz
GAIN = 5
RIN = 4k
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