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參數(shù)資料
| 型號： | VCA822IDGS |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER |
| 中文描述： | 寬帶，“40dB的增益調(diào)整范圍在V，線性音頻/視頻可變增益放大器 |
| 文件頁數(shù)： | 27/35頁 |
| 文件大?。?/td> | 837K |
| 代理商： | VCA822IDGS |
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*
*
e
nOUTPUT
i
niOUTPUT
i
inOUTPUT
I
CORE
e
nINPUT
i
nINPUT
R
F
4kTR
F
*
R
S2
4kTR
S2
*
R
F
4kTR
F
e
O
FB
GND
V
OUT
V
REF
V
G
V
G
x1
*
e
nINPUT
i
nINPUT
*
x1
R
G
(Noiseless)
+R
G
-
R
G
V
-
-
V
IN
+V
IN
*
R
S1
4kTR
S1
i
nINPUT
V+
THERMAL ANALYSIS
T = T + P
′ q
D
JA
(12)
P = 10V(38mA) + 5 /(4
100 ) = 442.5mW
′
(13)
°
Maximum T = +85 C + (0.449W
80 C/W) = 120.5 C
°
°
′
VCA822
SBOS343A–SEPTEMBER 2007–REVISED OCTOBER 2007
Figure 93. Full Noise Model
however, it is at a maximum when the output is fixed
at a voltage equal to one-half of either supply voltage
(for equal bipolar supplies). Under this worst-case
condition, P
DL
= V
S2
/(4
×
R
L
), where R
L
is the
resistive load.
The VCA822 does not require heatsinking or airflow
in most applications. The maximum desired junction
temperature sets the maximum allowed internal
power dissipation as described in this section. In no
case should the maximum junction temperature be
allowed to exceed +150
°
C.
Operating junction temperature (T
J
) is given by
Equation 12
:
Note that it is the power in the output stage and not in
the load that determines internal power dissipation.
As a worst-case example, compute the maximum T
J
using a VCA822ID (SO-14 package) in the circuit of
Figure 77
operating at maximum gain and at the
maximum specified ambient temperature of +85
°
C.
The total internal power dissipation (P
D
) is the sum of
quiescent
power
(P
DQ
)
dissipated in the output stage (P
DL
) to deliver load
power. Quiescent power is simply the specified
no-load supply current times the total supply voltage
across the part. P
DL
depends on the required output
signal and load; for a grounded resistive load,
and
additional
power
(14)
This maximum operating junction temperature is well
below most system level targets. Most applications
should be lower because an absolute worst-case
output stage power was assumed in this calculation
of V
CC
/2, which is beyond the output voltage range for
the VCA822.
Copyright 2007, Texas Instruments Incorporated
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VCA822
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| VCA822IDGSR | 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDGSRG4 | 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDGST | 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDGSTG4 | 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDR | 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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