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参数资料
| 型号： | DAC7612U |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 7 us SETTLING TIME, 12-BIT DAC, PDSO8 |
| 封装： | GREEN, SOIC-8 |
| 文件页数： | 2/16页 |
| 文件大小： | 316K |
| 代理商： | DAC7612U |
10
DAC7612
next 12 bits are the code (MSB-first) sent to the DAC. The
data format is Straight Binary and is loaded MSB-first into
the shift registers after loading the address bits. Table I shows
the relationship between input code and output voltage.
The digital data into the DAC7612 is double-buffered. This
means that new data can be entered into the chosen DAC
without disturbing the old data and the analog output of the
converter. At some point after the data has been entered into
the serial shift register, this data can be transferred into the
DAC registers. This transfer is accomplished with a HIGH
to LOW transition of the LOADDACS pin. The LOADDACS
pin makes the DAC registers transparent. If new data is
shifted into the shift register while LOADDACS is LOW,
the DAC output voltages will change as each new bit is
entered. To prevent this, LOADDACS must be returned
HIGH prior to shifting in new serial data.
DIGITAL-TO-ANALOG CONVERTER
The internal DAC section is a 12-bit voltage output
device that swings between ground and the internal ref-
erence voltage. The DAC is realized by a laser-trimmed
R-2R ladder network which is switched by N-channel
MOSFETs. Each DAC output is internally connected to a
rail-to-rail output operational amplifier.
OUTPUT AMPLIFIER
A precision, low-power amplifier buffers the output of each
DAC section and provides additional gain to achieve a 0V to
4.095V range. Each amplifier has low offset voltage, low
OPERATION
The DAC7612 is a dual, 12-bit digital-to-analog converter
(DAC) complete with a serial-to-parallel shift register, DAC
registers, laser-trimmed 12-bit DACs, on-board reference,
and rail-to-rail output amplifiers. Figure 1 shows the basic
operation of the DAC7612.
INTERFACE
Figure 1 shows the basic connection between a
microcontroller and the DAC7612. The interface consists of
a Serial Clock (CLK), Serial Data (SDI), and a Load DAC
signal (LOADDACS). In addition, a chip select (CS) input is
available to enable serial communication when there are
multiple serial devices. Loading either DAC A or DAC B is
done by shifting 14 serial bits in via the SDI input. The first
2 bits represent the address of the DAC to be updated and the
DAC7612 Full-Scale Range = 4.095V
Least Significant Bit = 1mV
DIGITAL INPUT CODE
ANALOG OUTPUT
STRAIGHT OFFSETBINARY
(V)
DESCRIPTION
FFFH
+4.095
Full Scale
801H
+2.049
Midscale + 1 LSB
800H
+2.048
Midscale
7FFH
+2.047
Midscale – 1 LSB
000H
0
Zero Scale
TABLE I. Digital Input Code and Corresponding Ideal
Analog Output.
FIGURE 1. Basic Operation of the DAC7612.
1
2
3
4
8
7
6
5
SDI
CLK
LOADDACS
CS
V
OUTA
V
DD
GND
V
OUTB
DAC7612U
Serial Data
Serial Clock
Load DACs
Chip Select
0.1
F
0V to +4.095V
10
F
+
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DAC7612U | 制造商:BURR-BROWN 功能描述:IC 12BIT DAC 7612 SOIC8 制造商:Texas Instruments 功能描述:IC 12BIT DAC 130KHZ 7612 SOIC8 |
| DAC7612U | 制造商:Texas Instruments 功能描述:D/A Converter (D-A) IC |
| DAC7612U/2K5 | 功能描述:数模转换器- DAC Dual 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC7612U/2K5G4 | 功能描述:数模转换器- DAC Dual 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC7612UB | 功能描述:数模转换器- DAC Dual 12-Bit Serial Input RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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