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參數(shù)資料
| 型號(hào)： | WM2627 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Quad 8-Bit Serial Input Voltage Output DAC |
| 中文描述： | 四8位串行輸入電壓輸出DAC |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大?。?/td> | 107K |
| 代理商： | WM2627 |
WM2627
DEVICE DESCRIPTION
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 April 2001
8
GENERAL FUNCTION
The device 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:
(
)
256
2
CODE
V
out
V
REFIN
=
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 (0V to 2V
REF
Output), Gain = 2
POWER ON RESET
An internal power-on-reset circuit resets the DAC registers 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.
EXTERNAL REFERENCE
The reference voltage input is buffered which makes the DAC input resistance independent of code.
REFINAB and REFINCD pins have an input resistance of 10M
and an input capacitance of typically
5pF. The reference voltage determines the DAC full-scale output.
HARDWARE CONFIGURATION OPTIONS
DEVICE POWER DOWN
The device can be powered-down by pulling pin NPD (Pin 2) high. This powers down all DACs
overriding their individual power down settings. This will reduce power consumption to typically 10nA.
When the power down function is released the device reverts to the DAC code set prior to power
down.
SIMULTANEOUS DAC UPDATE
The NLDAC pin (Pin 3) can be held high to prevent serial word writes from updating the DAC latches.
By writing new values to multiple DACs then pulling NLDAC low, all new DAC codes are loaded into
the DAC latches simultaneously.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WM2627IDT | Quad 8-Bit Serial Input Voltage Output DAC |
| WM2629 | Octal 8-bit, Serial Input, Voltage Output DAC with Power Down |
| WM2630CDT | Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
| WM2630 | Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
| WM2630IDT | Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM2627CDT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Quad 8-Bit Serial Input Voltage Output DAC |
| WM2627IDT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Quad 8-Bit Serial Input Voltage Output DAC |
| WM2629 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Octal 8-bit, Serial Input, Voltage Output DAC with Power Down |
| WM2630 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
| WM2630CDT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference |
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