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參數(shù)資料
| 型號： | LT1994MPDD#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DIFF AMP/DRIVER LN 8-MSOP |
| 標準包裝： | 2,500 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 65 V/µs |
| 增益帶寬積： | 70MHz |
| 電流 - 輸入偏壓： | 18µA |
| 電壓 - 輸入偏移： | 3000µV |
| 電流 - 電源： | 14.8mA |
| 電流 - 輸出 / 通道： | 85mA |
| 電壓 - 電源，單路/雙路(±)： | 2.375 V ~ 12.6 V，±1.188 V ~ 6.3 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-DFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
LT1994
14
1994fb
A plot of this equation and a plot of the noise generated
by the feedback components are shown in Figure 6.
The LT1994’s input referred voltage noise contributes the
equivalent noise of a 560
Ω resistor. When the feedback
network is comprised of resistors whose values are less
than this, the LT1994’s output noise is voltage noise
dominant (See Figure 6):
ee
R
no
ni
F
I
≈+
1
Feedback networks consisting of resistors with values
greater than about 10k will result in output noise which
is amplier current noise dominant.
eI
R
no
n
F
≈ 2
Lower resistor values always result in lower noise at the
penalty of increased distortion due to increased loading of
the feedback network on the output. Higher resistor values
will result in higher output noise, but improved distortion
due to less loading on the output.
Figure 6 shows the noise voltage that will appear differ-
entially between the outputs. The common mode output
noise voltage does not add to this differential noise. For
optimum noise and distortion performance, use a dif-
ferential output conguration.
Power Dissipation Considerations
The LT1994 is housed in either an 8-lead MSOP package
(
θJA = 140°C/W or an 8-lead DD package (θJA = 43°C/W).
The LT1994 combines high speed and large output current
with a small die and small package so there is a need to
be sure the die temperature does not exceed 150°C. In the
8-lead MSOP, LT1994 has its V– lead fused to the frame
so it is possible to lower the package thermal impedance
by connecting the V– pin to a large ground plane or metal
trace. Metal trace and plated through holes can be used to
spread the heat generated by the device to the backside
of the PC board. For example, an 8-lead MSOP on a 3/32"
FR-4 board with 540mm2 of 2oz. copper on both sides
of the PC board tied to the V– pin can drop the
θJA from
140°C/W to 110°C/W (see Table 1).
The underside of the DD package has exposed metal
(4mm2) from the lead frame where the die is attached.
This provides for the direct transfer of heat from the die
junction to the printed circuit board to help control the
maximum operating junction temperature. The dual-in-line
pin arrangement allows for extended metal beyond the
ends of the package on the topside (component side) of a
circuit board. Table 1 summarizes for the MSOP package,
the thermal resistance from the die junction-to-ambient
that can be obtained using various amounts of topside,
and backside metal (2oz. copper). On multilayer boards,
further reductions can be obtained using additional metal
on inner PCB layers connected through vias beneath the
package.
Figure 6. LT1994 Output Spot Noise vs Spot Noise Contributed by
Feedback Network Alone
RF = RI (kΩ)
0.1
1
OUTPUT
NOISE
(nV/√Hz)
10
100
110
1994 F06
TOTAL
(AMPLIFIER + FEEDBACK NETWORK)
OUTPUT NOISE
FEEDBACK NETWORK
NOISE ALONE
1994 F05
RI2
RF2
VS/2
–VS/2
+
–
+
3
7
6
8
1
2
5
4
LT1994
VOCM
enRI2
2
RI1
RF1
encm
2
eno
2
in–
2
enRI1
2
eni
2
enRF2
2
enRF1
2
in+
2
Figure 5. Noise Analysis
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