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參數資料
| 型號： | TL026C |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DIFFERENTIAL HIGH-FREQUENCY AMPLIFIER WITH AGC |
| 中文描述： | 微分高頻率AGC放大器 |
| 文件頁數： | 6/9頁 |
| 文件大小： | 135K |
| 代理商： | TL026C |
TL026C
DIFFERENTIAL HIGH-FREQUENCY AMPLIFIER WITH AGC
SLFS007A – JUNE 1985 – REVISED JULY 1990
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Amplifier A2 inverts V1 producing a positive AGC signal voltage. Therefore, the input voltage to the TL026C
AGC pin consists of an AGC signal equal to:
(6)
R2
C
and a dc voltage derived from V
ref
, defined as the quiescent value of V
AGC
.
V
AGC
(q)
2
R6
R5
R6V
ref
(7)
For the initial resistor calculations, V
ref
is assumed to be typically 1.4 V making quiescent V
AGC
approximately
1.22 V (V
AGC
(q) = V
ref
– 180 mV). This voltage allows the TL026C to operate at maximum gain under no-signal
and low-signal conditions. In addition, with V
ref
used as both internal and external reference, its variation from
device to device automatically adjusts the overall bias and makes AGC operation essentially independent of
the absolute value of V
ref
. The resistor divider needs to be calculated only once and is valid for the full tolerance
of V
ref
.
output voltage limits (see Figures 6 and 7)
The output voltage level desired must fall within the following limits:
1.
Because the data sheet minimum output swing is 3 V peak-to-peak using a 2-k
load resistor, the
user-selected design limit for the peak output swing should not exceed 1.5 V.
2.
The voltage drop of the rectifying diode determines the lower voltage limit. When a silicon diode is
used, this voltage is approximately 0.7 V. The output voltage V
O
must have sufficient amplitude to
exceed the rectifying diode drop. Aschottky diode can be used to reduce the V
O
level required.
gain calculations for a peak output voltage of 1 V
A peak output voltage of 1 V was chosen for gain calculations because it is approximately midway between the
limits of conditions 1 and 2 in the preceding paragraph.
Using equation 3 (V
C
= V
OP
– V
d
), V
C
is calculated as follows:
V
C
= 1 V – 0.7 V
V
C
= 0.3 V
Therefore, the gain of A1 must produce a voltage V1 that is equal to or greater than the total change in V
AGC
for maximum TL026C gain change.
With a total change in V
AGC
of 360 mV and using equation 4, the calculation is as follows:
V
AGC
V
C
V1
V
C
R2
R1
0.36
0.3
1.2
If R1 is 10 k
, R2 is 1.2 time R1 or 12 k
.
Since the output voltage for this circuit must be between 0.85 V and 1.3 V, the component values in
Figures 6 and 7 provide a nominal 1-V peak output limit. This limit is the best choice to allow for temperature
variations of the diode and minimum output voltage specification.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TL026CD | 功能描述:視頻放大器 Hi f w/AGC RoHS:否 制造商:ON Semiconductor 通道數量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| TL026CDE4 | 功能描述:視頻放大器 Diff High-Frequency w/AGC RoHS:否 制造商:ON Semiconductor 通道數量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| TL026CDG4 | 功能描述:視頻放大器 Diff Hi-Freq Amp RoHS:否 制造商:ON Semiconductor 通道數量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| TL026CDR | 功能描述:視頻放大器 Diff Hf w/AGC RoHS:否 制造商:ON Semiconductor 通道數量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| TL026CDRE4 | 功能描述:視頻放大器 Diff High-Frequency w/AGC RoHS:否 制造商:ON Semiconductor 通道數量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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