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參數資料
| 型號： | MC68176 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 2-bit A/D Converter(2位A/D轉換器) |
| 中文描述： | 2位A / D轉換器（2位的A / D轉換器） |
| 文件頁數： | 7/29頁 |
| 文件大小： | 235K |
| 代理商： | MC68176 |
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Preliminary
MOTOROLA
MC68176 Technical Data Sheet
1-3
Signal/Connection Descriptions
Analog Inputs
ANALOG INPUTS
ANALOG CONTROL
Table 1-4
Analog Input Signals
Signal Name
Type
Signal Description
ADIN
Input
Analog Data In
—This is the 4-level baseband analog audio input signal
to be digitized.
DC-OFFSET
Input
DC Offse
t—This analog input signal is the dc content of the analog
input signal ADIN. This pin needs a dc voltage (identical to the IF dc
voltage content) applied to it, to prevent clipping of the ADIN input
signal.
Table 1-5
Analog Control Signals
Signal Name
Type
Signal Description
V
ADD
SEL
Input
V
ADD
Select
—If V
ADD
is nominal 3 V, set V
ADD
SEL to 0. If V
ADD
is
nominal 2 V, set V
ADD
SEL to 1.
This signal has two functions—to enable a charge pump when V
ADD
is
2 V, and to control the analog gain of the filter stage.
If V
ADD
SEL is 1, the charge pump is enabled, ensuring parts of the
analog circuit have a higher supply.
V
ADD
SEL also controls the gain of the filter stage:
V
ADD
SEL = 0: gain = 3.656
V
ADD
SEL = 1: gain = 2.437
BandWidth Select
—This digital signal controls the cutoff frequency for
the second-order low-pass Butterworth or Switched Capacitor filter:
BW
Input
BW = 0: 1 kHz filter (for 1600 symbols/ second)
BW = 1: 2 kHz filter (for 3200 symbols/ second)
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