- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69485 > TL026CDRG4 (TEXAS INSTRUMENTS INC) SPECIALTY ANALOG CIRCUIT, PDSO8 PDF資料下載
參數(shù)資料
| 型號： | TL026CDRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大小： | 508K |
| 代理商： | TL026CDRG4 |
TL026C
DIFFERENTIAL HIGH-FREQUENCY AMPLIFIER WITH AGC
SLFS007A – JUNE 1985 – REVISED JULY 1990
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain characteristics
Figure 5 shows the differential voltage amplification versus the differential gain-control voltage (VAGC – Vref).
VAGC is the absolute voltage applied to the AGC input and Vref is the dc voltage at the REF OUT output. As VAGC
increases with respect to Vref, the TL026C gain changes from maximum to minimum. As shown in Figure 5 for
example, VAGC would have to vary from approximately 180 mV less than Vref to approximately 180 mV greater
than Vref to change the gain from maximum to minimum. The total signal change in VAGC is defined by the
following equation.
VAGC = Vref + 180 mV – (Vref – 180 mV)
VAGC = 360 mV
(1)
However, because VAGC varies as the ac AGC signal varies and also differentially around Vref, then VAGC should
have an ac signal component and a dc component. To preserve the dc and thermal tracking of the device, this
dc voltage must be generated from Vref. To apply proper bias to the AGC input, the external circuit used to
generate VAGC must combine these two voltages. Figures 6 and 7 show two circuits that will perform this
operation and are easy to implement. The circuits use a standard dual operational amplifier for AGC feedback.
By providing rectification and the required feedback gain, these circuits are also complete AGC systems.
circuit operation
Amplifier A1 amplifies and inverts the rectified and filtered AGC signal voltage VC producing output voltage V1.
Amplifier A2 is a differential amplifier that inverts V1 again and adds the scaled Vref voltage. This conditioning
makes VAGC the sum of the signal plus the scaled Vref. As the signal voltage increases, VAGC increases and
the gain of the TL026C is reduced. This maintains a constant output level.
feedback circuit equations
Following the AGC input signal (Figures 6 and 7) from the OUT output through the feedback amplifiers to the
AGC input produces the following equations:
(2)
1. AC ouput to diode D1, assuming sinusoidal signals
VO = VOP (sin (wt))
where:
VOP = peak voltage of VO
(3)
2. Diode D1 and capacitor C1 output
VC = VOP – VF
where:
VF = forward voltage drop of D1
VC = voltage across capacitor C1
(4)
3. A1 output
V1
+* R2
R1
V
C
(5)
4. A2 output (R3 = R4)
V
AGC +
R2
R1
V
C )
2
R6
R5
) R6
V
ref
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TL026CD | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| TL026CPSRE4 | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| TL1431AID | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| TL1431CZT | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PBCY3 |
| TL1431CD | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TL026CP | 功能描述:視頻放大器 Hi f w/AGC RoHS:否 制造商:ON Semiconductor 通道數(shù)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 |
| TL026CPE4 | 功能描述:視頻放大器 Diff High-Frequency w/AGC RoHS:否 制造商:ON Semiconductor 通道數(shù)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 |
| TL026CPS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TL026CPSR | 功能描述:視頻放大器 Diff High-Frequency w/AGC RoHS:否 制造商:ON Semiconductor 通道數(shù)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 |
| TL026CPSRE4 | 功能描述:視頻放大器 Diff High-Frequency w/AGC RoHS:否 制造商:ON Semiconductor 通道數(shù)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。