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參數(shù)資料
| 型號： | WM2630IDT |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
| 中文描述： | 八路12位，串行輸入，電壓與內(nèi)部基準(zhǔn)輸出DAC |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 126K |
| 代理商： | WM2630IDT |
WM2630
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 1.1 February 2001
8
DEVICE DESCRIPTION
GENERAL FUNCTION
The WM2630 is an octal 12-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 12-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 =
(
)
4096
CODE
V
2
REF
INPUT
1111
OUTPUT
)
1111
1111
(
4096
4095
V
2
REF
:
:
)
1000
0000
0001
(
4096
2049
V
2
REF
1000
0000
0000
(
)
REF
REF
V
4096
)
2048
V
2
=
0111
1111
1111
(
4096
2047
V
2
REF
:
:
)
0000
0000
0001
(
4096
1
V
2
REF
0000
0000
0000
0V
Table 1 Binary Code Table (0V to 2V
REF
Output), Gain = 2
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.
PROGRAMMABLE REFERENCE
The DAC reference can be sourced internally or externally under software control. If an external reference
voltage is applied to the REF pin, the device must be configured to accept this. If an internal reference is
selected, a voltage of 1.024V or 2.048 is available. The internal reference can source up to 1mA and can
therefore be used as an external system reference.
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