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参数资料
| 型号： | LC89057W-VF4A-E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封装： | 7 X 7 MM, SQFP-48 |
| 文件页数： | 15/16页 |
| 文件大小： | 328K |
| 代理商： | LC89057W-VF4A-E |
LA7555
No.2927–8/11
Fig.10-1
11. AF amplifier
As shown in Fig.11-1, this is an AF amplifier equipped with an NFB pin. An audio power amplifier can be easily
configured by use of this NFB pin. The gain of the power amplifier can be controlled by the ratio of R1 and R2.
Fig.11-1
VCO adjustment methods
The following two methods are available for adjusting the VCO.
1. APC voltage offset adjustment method
a. Connect a digital voltmeter to pin 20 (APC filter pin ) (Fig.1).
b. Lower the IF input level and connect the IF AGC (pin 13) to GND.
Measure the voltage on pin 20 at this time.
c. Raise the IF input level to the desired value. Free the IF AGC from GND (internal AGC). Adjust the VCO so
that the voltage (V2) on pin 20 is equal to V1.
Note : When adjusting by this method, use a DVM (digital voltme-
ter) with high input impedance. At Zi=10M
Ω, the adjustment
error is approximately 20kHz, The error (
ΔV) with the DVM
connected is.
ΔV (mV)= V (1–
)
The change in VCO free-running frequency (
Δf) according to
ΔV is Δf (kHz)=ΔV× β
where
β=VCO control sensitivity (kHz/mV)
R1
Z+R1
2. Direct reading method
a. Lower the IF input level and adjust the IF AGC (pin 13) to between GND and about 4V (VCO free run).
b. Monitor the carrier frequency leaking from pins other than the VCO coil, or pattern, chassis, and adjust the
VCO coil to obtain the desired frequency (fp).
Fig.1
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相关代理商/技术参数 |
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| LC89057W-VF4A-TBM-E | 制造商:ON Semiconductor 功能描述: 制造商:ON Semiconductor 功能描述:AUDIO I/F RECEIVER |
| LC89058W | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:CMOS IC Digital Audio Interface Receiver |
| LC89058WA-E | 功能描述:音频发送器、接收器、收发器 RoHS:否 制造商:Cirrus Logic 工作电源电压:3.3 V, 5 V 电源电流:11.8 mA 通道数量:1 最大工作温度:+ 70 C 接口类型:I2C, SPI 安装风格:SMD/SMT 封装 / 箱体:TSSOP-28 封装: |
| LC89058W-E | 功能描述:音频 DSP AUDIO INTERFACE RECEIVER RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| LC8905V | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Digital Audio Interface Receiver |
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