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參數(shù)資料
| 型號(hào)： | DAC7512N/3K |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 12 us SETTLING TIME, 12-BIT DAC, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 393K |
| 代理商： | DAC7512N/3K |
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DAC7512
14
SBAS156
MICROPROCESSOR
INTERFACING
DAC7512 TO 8051 INTERFACE
Figure 6 shows a serial interface between the DAC7512 and
a typical 8051-type microcontroller. The setup for the inter-
face is as follows: TXD of the 8051 drives SCLK of the
DAC7512, while RXD drives the serial data line of the part.
The SYNC signal is derived from a bit programmable pin on
the port. In this case, port line P3.3 is used. When data is to
be transmitted to the DAC7512, P3.3 is taken LOW. The
8051 transmits data only in 8-bit bytes; thus only eight
falling clock edges occur in the transmit cycle. To load data
to the DAC, P3.3 is left LOW after the first eight bits are
transmitted, and a second write cycle is initiated to transmit
the second byte of data. P3.3 is taken HIGH following the
completion of this cycle. The 8051 outputs the serial data in
a format which has the LSB first. The DAC7512 requires its
data with the MSB as the first bit received. The 8051
transmit routine must therefore take this into account, and
“mirror” the data as needed.
DAC7512 TO Microwire INTERFACE
Figure 7 shows an interface between the DAC7512 and any
Microwire compatible device. Serial data is shifted out on
the falling edge of the serial clock and is clocked into the
DAC7512 on the rising edge of the SK signal.
The 68HC11 should be configured so that its CPOL bit is a
0 and its CPHA bit is a 1. This configuration causes data
appearing on the MOSI output is valid on the falling edge of
SCK. When data is being transmitted to the DAC, the SYNC
line is taken LOW (PC7). Serial data from the 68HC11 is
transmitted in 8-bit bytes with only eight falling clock edges
occurring in the transmit cycle. Data is transmitted MSB
first. In order to load data to the DAC7512, PC7 is left LOW
after the first eight bits are transferred, and a second serial
write operation is performed to the DAC and PC7 is taken
HIGH at the end of this procedure.
APPLICATIONS
USING REF02 AS A POWER SUPPLY FOR DAC7512
Due to the extremely low supply current required by the
DAC7512, an alternative option is to use a REF02 +5V
precision voltage reference to supply the required voltage to
the part, as shown in Figure 9. This is especially useful if the
power supply is too noisy or if the system supply voltages
are at some value other than 5V. The REF02 will output a
steady supply voltage for the DAC7512. If the REF02 is
used, the current it needs to supply to the DAC7512 is
FIGURE 6. DAC7512 to 80C51/80L51 Interface
FIGURE 7. DAC7512 to Microwire Interface
FIGURE 8. DAC7512 to 68HC11 Interface.
FIGURE 9. REF02 as Power Supply to DAC7512
REF02
DAC7512
Three-Wire
Serial
Interface
+5V
135
A
V
OUT = 0V to 5V
SYNC
SCLK
D
IN
+15
DAC7512 TO 68HC11 INTERFACE
Figure 8 shows a serial interface between the DAC7512 and
the 68HC11 microcontroller. SCK of the 68HC11 drives the
SCLK of the DAC7512, while the MOSI output drives the
serial data line of the DAC. The SYNC signal is derived
from a port line (PC7), similar to what was done for the
8051.
80C51/80L51(1)
P3.3
TXD
RXD
DAC7512(1)
SYNC
SCLK
D
IN
NOTE: (1) Additional pins omitted for clarity.
SYNC
SCLK
D
IN
MicrowireTM
CS
SK
SO
DAC7513(1)
68HC11(1)
PC7
SCK
MOSI
SYNC
SCLK
D
IN
DAC7513(1)
NOTE: (1) Additional pins omitted for clarity.
Microwire is a registered trademark of National Semiconductor.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC7513 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, Rail-to-Rail Output, 12-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER |
| DAC7513E | 制造商:Texas Instruments 功能描述:IC 12BIT DAC SMD 7513 VSSOP8 |
| DAC7513E/250 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Lo-Pwr R-To-R Output 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7513E/250G4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Lo-Pwr R-To-R Output 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7513E/2K5 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Lo-Pwr R-To-R Output 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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