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參數(shù)資料
| 型號(hào)： | HDM8513A |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Linear Voltage Regulator IC; Package/Case:3-TO-92; Supply Voltage:30V; Output Voltage:5V; Current Rating:0.1A; Operating Temp. Max:70 C; Operating Temp. Min:0 C; Output Voltage Max:5V; Voltage Regulator Type:Positive Voltage |
| 中文描述： | 的DVB /決策支持系統(tǒng)兼容接收器 |
| 文件頁數(shù)： | 47/67頁 |
| 文件大?。?/td> | 261K |
| 代理商： | HDM8513A |
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47
11
Wideband AGC Control
Bit 0. Wideband AGC Mode
When this bit is set to one (Mode 0), the WB AGC output must be
filtered with an external integrating analog filter to implement a first order
feedback loop. When this bit is zero (Mode 1), a digital integrator within
the HDM8513A performs this function and the only external analog
function required is a low pass filter to remove the high frequency
components of the sigma delta converter output.
Bit 1. WB AGC Invert
When this bit is set to zero a high duty factor on the WB AGC output
corresponds to too much gain. When the control bit is set to one, high
duty factor corresponds to not enough gain.
Bit 2. WB AGC Hold
During normal tracking operation, this bit is set to one. When this bit is
set to zero and the wideband AGC is in Mode 1, the digital integrator is
held to the most recent value and loop updates are inhibited.
Bit 3. LNB Hold
When this bit is set to one, the output of LNB-Tone is held on zero.
Bit 4. I2C By-pass
When this bit is set to zero, SCL_I2CO and SDA_I2CO are disabled.
The default is one and Data/clock can be by-passed.
Bits [7:5]. WB AGC Gain
This three bit field defines the time constant of the WB AGC in Mode 1.
A value of zero corresponds to the shortest time constant and 7
corresponds to the slowest time constant.
LNB Tone
This eight bit value establishes the control for LNB tone generator. If f
L
is the desired frequency and f
C
is the clock frequency, the value to be
stored in this 8 bit field is the integer portion of f
L
(2
17
)/f
C
. The default
value(30H) generates 22KHz tone at 60MHz sampling clock.
Sigma Delta
This eight bit input value establishes the control for Sigma Delta
converter. This function is independent of other demodulator functions
and is provided as control for external analog components.
12
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