參數資料
| 型號： | LTC6244HVCDD#PBF |
| 廠商： | Linear Technology |
| 文件頁數： | 8/26頁 |
| 文件大小： | 0K |
| 描述： | IC OP AMP DUAL R-R 8-DFN |
| 標準包裝： | 121 |
| 放大器類型： | 通用 |
| 電路數： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 40 V/µs |
| 增益帶寬積： | 50MHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 7mA |
| 電流 - 輸出 / 通道： | 55mA |
| 電壓 - 電源，單路/雙路(±)： | 2.8 V ~ 11 V，±1.4 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WFDFN 裸露焊盤 |
| 供應商設備封裝： | 8-DFN-EP（3x3） |
| 包裝： | 管件 |
LTC6244
16
6244fb
resistance of the particular application. Specically, these
ampliers exhibit the noise of a 4k resistor, meaning it is
desirable to keep the source and feedback resistance at or
below this value, i.e., RS + RG||RFB ≤ 4k. Above this total
source impedance, the noise voltage is not dominated by
the amplier.
Noise current can be estimated from the expression in =
√2qIB, where q = 1.6 10–19 coulombs. Equating √4kTRΔf
and RS√2qIBΔf shows that for source resistors below
50GΩ the amplier noise is dominated by the source
resistance. See the Typical Characteristics curve Noise
Current vs Frequency.
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 source and feedback resistors. High frequency noise
from the amplier tail current source, ITAIL in Figure 1,
couples through the input capacitance and appears across
these large source and feedback resistors.
Stability
The good noise performance of these op amps can be
attributed to large input devices in the differential pair.
Above several hundred kilohertz, the input capacitance
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 3), this pole can create excess
phase shift and possibly oscillation. A small capacitor CF
in parallel with RF eliminates this problem.
Achieving Low Input Bias Current
The DD package is leadless and makes contact to the PCB
beneath the package. Solder ux used during the attach-
ment of the part to the PCB can create leakage current
paths and can degrade the input bias current performance
of the part. All inputs are susceptible because the backside
paddle is connected to V– internally. As the input voltage
changes or if V– changes, a leakage path can be formed
and alter the observed input bias current. For lowest bias
current, use the LTC6244 in the MS8 package.
Photodiode Ampliers
Photodiodes can be broken into two categories: large area
photodiodes with their attendant high capacitance (30pF
to 3000pF) and smaller area photodiodes with relatively
low capacitance (10pF or less). For optimal signal-to-noise
performance, a transimpedance amplier consisting of an
inverting op amp and a feedback resistor is most commonly
used to convert the photodiode current into voltage. In low
noise amplier design, large area photodiode ampliers
require more attention to reducing op amp input voltage
noise, while small area photodiode ampliers require
more attention to reducing op amp input current noise
and parasitic capacitances.
Figure 3. Compensating Input Capacitance
APPLICATIONS INFORMATION
+
–
CIN
CS
6244 F03
RF
RS
OUTPUT
CF
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