- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄30726 > LA7790M SPECIALTY CONSUMER CIRCUIT, PDSO24 PDF資料下載
參數(shù)資料
| 型號(hào)： | LA7790M |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | MFP-24 |
| 文件頁(yè)數(shù)： | 2/14頁(yè) |
| 文件大小： | 174K |
| 代理商： | LA7790M |
第1頁(yè)當(dāng)前第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)
2. Attenuator
The attenuator input signal comes from the modulator output via a high pass filter (fC = 2 MHz). The modulator
output is pin 19. Pin 19 is connected to the emitter of an NPN emitter follower through a 100
resistor. The emitter
sink current is about 1 mA, but can be increased by the addition of an external resistor between pin 19 and ground.
The minimum value for the external resistor is 1.5 k
.
The output level of pin 19 can be adjusted using pin 21. Pin 21 is connected to the base of a PNP emitter follower
through a 300
resistor. When pin 21 = 0 V, the base current is about 10 A.
Equivalent circuit of attenuator block
3. RF Amplifier
The RF amplifier input signal comes from the attenuator output after the harmonics are removed by the LPF. The RF
amplifier is composed of a two-stage amplifier and includes mute and power save functions.
The gain of the RF amplifier can be adjusted using the external input resistor connected to pin 22 and the external
load resistor connected to pin 1. The input of pin 22 must be AC coupled. The output of pin 1 must be connected to
VCC via a choke coil. Pin 23 (mute control) and pin 20 (power save control) are both high impedance inputs (base
current less than 10 A). For normal operation, the voltage at pins 20 and 23 must be less than 1 V. For Mute and
Power Save operation, the voltage at pins 20 are 23 must be between VCC–1 and VCC.
No. 5689-10/14
LA7790M
VCC
Control
Circuit
ATT
HPF
300
1 k
Gain
control
0 to 10
A
21
MOD
output
19
1 mA
From Modulator
1 k
100
1 mA
Unit (resistance :
)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA7800 | HORIZ/VERT DEFLECTION IC, PDIP16 |
| LA7801 | HORIZ/VERT DEFLECTION IC, PDIP16 |
| LA7802 | HORIZ/VERT DEFLECTION IC, PDIP18 |
| LA78040B | VERTICAL DEFLECTION IC, ZFM7 |
| LA78040B | VERTICAL DEFLECTION IC, ZFM7 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA7791T | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For CATV/Cable Modem Variable Gain Controlled Amplifier |
| LA7791T-TLM-E | 制造商:ON Semiconductor 功能描述:AGC AMPLIFIER - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / AGC AMPLIFIER |
| LA7793V | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:With Driver amplifier for ADC AGC amplifier |
| LA7793V-TLM-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA7795T | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AGC Amplifier with Step Gain Control |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。