- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361880 > WM2636ID (Wolfson Microelectronics) 12-bit Serial Input Voltage Output DAC with Internal Reference PDF資料下載
參數(shù)資料
| 型號(hào)： | WM2636ID |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | 12-bit Serial Input Voltage Output DAC with Internal Reference |
| 中文描述： | 12位串行輸入電壓與內(nèi)部基準(zhǔn)輸出DAC |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 392K |
| 代理商： | WM2636ID |
WM2636
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 July 1999
7
DEVICE DESCRIPTION
GENERAL FUNCTION
The device 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.
SERIAL INTERFACE
Explanation of data transfer:
First, the device has to be enabled with NCS set to low. Then, a falling edge of FS starts
shifting the data bit-per-bit (starting with the MSB) to the internal register on the falling edges of
SCLK. After 16 bits have been transferred or FS rises, the content of the shift register is moved
to the DAC latch which updates the voltage output to the new level.
The serial interface of the device can be used in two basic modes:
four wire (with chip select)
three wire (without chip select)
Using chip select (four wire mode), it is possible to have more than one device connected to
the serial port of the data source (DSP or microcontroller). If there is no need to have more
than one device on the serial bus, then NCS can be tied low.
SERIAL CLOCK AND UPDATE RATE
Figure 1 shows the device timing. The maximum serial rate is:
1
min
WCL
min
WCH
+
The digital update rate is limited to an 800ns period, or 1.25MHz frequency. However, the DAC
settling time to 12 bits limits the update rate for large input step transitions.
f
SCLK
max =
MHz
20
t
t
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WM2637 | Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2637CD | Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2637ID | Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2638 | Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
| WM2638CD | Dual 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 |
|---|---|
| WM2637 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2637CD | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2637ID | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference |
| WM2638 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
| WM2638CD | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Dual 12-Bit Serial Input Voltage Output DAC with Internal reference |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。