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參數(shù)資料
| 型號(hào)： | PCL-818L |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High-performance DAS card with programmable gain |
| 中文描述： | 高性能DAS的可編程增益卡 |
| 文件頁(yè)數(shù)： | 48/74頁(yè) |
| 文件大小： | 546K |
| 代理商： | PCL-818L |
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44
PCL-818L User's Manual
General information
The PCL-818L provides one D/A output channel with two double-
buffered 12-bit multiplying D/A converters. Write registers at address-
es BASE+4 and BASE+5 hold data to be output. DA0 is the least
significant bit (LSB) and DA11 is the most significant bit (MSB) of
the D/A data. The register data format appears below:
BASE+4 D/A output low byte
Bit
D7
Value
DA3
D6
DA2
D5
DA1
D4
DA0
D3
X
D2
X
D1
X
D0
X
BASE+5 D/A output high byte
Bit
D7
D6
Value
DA11
DA10
D5
DA9
D4
DA8
D3
DA7
D2
DA6
D1
DA5
D0
DA4
When you write data to the D/A channels, write the low byte first. The
low byte is temporarily held by a register in the D/A and not released
to the output. After you write the high byte, the low byte and high byte
are added and passed to the D/A converter. This double buffering
process protects D/A data integrity through a single step update.
The PCL-818L provides a precision fixed internal -5 V or -10 V
reference, selectable by means of Jumper JP5. This reference voltage
is available at connector CN3 pin 11. If you use this voltage as the
D/A reference input, the D/A output range is either 0 to +5 V or 0 to
+10 V. You can also use an external DC or AC source as the D/A
reference input. In this case, the maximum reference input voltage is
±10 V, and the maximum D/A output ranges are 0 to +10 V or
0 to -10 V.
Connector CN3 supports all D/A signal connections. See Chapter 2,
Connector pin assignments
, for connector pin assignments. Chapter 3
gives a wiring diagram for D/A signal connections.
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