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參數(shù)資料
| 型號： | WM2629 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Octal 8-bit, Serial Input, Voltage Output DAC with Power Down |
| 中文描述： | 八進制8位，串行輸入，電壓與掉電輸出DAC |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 119K |
| 代理商： | WM2629 |
WM2629
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 April 2001
8
DEVICE DESCRIPTION
GENERAL FUNCTION
The WM2629 is an octal 8-bit, voltage output DAC. It contains a serial interface, control logic for
speed and power down, a programmable voltage reference, and eight digital to analogue converters.
Each converter uses a resistor string network buffered with an op amp to convert 8-bit digital data to
analogue voltage levels (see Block Diagram). The output voltage is determined by the reference
input voltage and the input code according to the following relationship:
Output voltage =
(
)
256
2
CODE
V
REF
INPUT
OUTPUT
(
V
1111
1111
)
256
255
2
REF
:
:
1000
0001
(
)
256
129
2
REF
V
1000
0000
(
)
REF
REF
V
V
=
256
128
2
0111
1111
(
)
256
127
2
REF
V
:
:
0000
0001
(
)
256
1
2
REF
V
0000
0000
0V
Table 1 Binary Code Table
POWER ON RESET
An internal power-on-reset circuit resets the DAC register to all 0s on power-up.
BUFFER AMPLIFIER
The output buffer has a near rail-to-rail output with short circuit protection and can reliably drive a
2k
load with a 100pF load capacitance.
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