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參數(shù)資料
| 型號： | LTC6242IGN#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/32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） |
| 供應商設備封裝： | 16-SSOP |
| 包裝： | 管件 |
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LTC6240/LTC6241/LTC6242
20
624012fe
Proprietary design techniques are used to obtain simulta-
neous low 1/f noise and low input capacitance. Low input
capacitance is important when the amplier is used with
high value source and feedback resistors. High frequency
noise from the amplier tail current source, ITAIL in Fig-
ure 1, couples through the input capacitance and appears
across these large source and feedback resistors. As an
example, the photodiode amplier of Figure 15 on the last
page of this data sheet shows the noise results from the
LTC6241 and the results of a competitive CMOS amplier.
The LTC6241 output is the ideal noise of a 1MΩ resistor
at room temperature, 130nV√Hz.
Half the Noise
The circuit shown in Figure 3 can be used to achieve even
lower noise voltage. By paralleling 4 ampliers the noise
voltage can be lowered by √4, or half as much noise. The
√
–
comes about from an RMS summing of uncorrelated
noise sources. This circuit maintains extremely high input
resistance, and has a 250Ω output resistance. For lower
output resistance, a buffer amplier can be added without
inuencing the noise.
Stability
The good noise performance of these op amps can be at-
tributed to large input devices in the differential pair. Above
several hundred kilohertz, the input capacitance rises and
can cause amplier stability problems if left unchecked.
When the feedback around the op amp is resistive (RF), a
pole will be created with RF, the source resistance, source
capacitance (RS, CS), and the amplier input capacitance.
In low gain congurations and with RF and RS in even
the kilohm range (Figure 4), this pole can create excess
phase shift and possibly oscillation. A small capacitor CF
in parallel with RF eliminates this problem.
Low Noise Single-Ended Input to Differential Output
Amplier
The circuit on the rst page of the data sheet is a low noise
single-ended input to differential output amplier, with a
200k input impedance. The very low input bias current
of the LTC6241 allows for these large input and feedback
resistors. The 200k resistors, R1 and R2, along with C1 and
C2 set the –3dB bandwidth to 80kHz. Capacitor C3 is used
to cancel effects of input capacitance, while C4 adds phase
lead to compensate the phase lag of the second amplier.
Figure 3. Parallel Amplier Lowers Noise by 2x
Figure 4. Compensating Input Capacitance
APPLICATIONS INFORMATION
10Ω
6241 F03
–
+
1/4
LTC6242
1k
10Ω
–
+
1/4
LTC6242
1k
10Ω
–
+
1/4
LTC6242
1k
10Ω
–
+
1/4
LTC6242
1k
+2.5
–2.5
VIN
VO
+
–
CIN
CS
6241 F04
RF
RS
OUTPUT
CF
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