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参数资料
| 型号： | DAC8554IPWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 12 us SETTLING TIME, 16-BIT DAC, PDSO16 |
| 封装： | GREEN, PLASTIC, TSSOP-16 |
| 文件页数： | 6/31页 |
| 文件大小： | 1039K |
| 代理商： | DAC8554IPWR |
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www.ti.com
THEORY OF OPERATION
DAC SECTION
DAC
Register
REF(+)
ResistorString
REF( )
-
V
L
REF
V
H
REF
V
OUT
62kW
50kW
V
OUTX + 2
V
REFL
) (VREFH * VREFL)
D
IN
65536
RESISTOR STRING
V
REFH
V
REFL
R
V
REF
2
R
DIVIDER
ToOutputAmplifier
(2xGain)
OUTPUT AMPLIFIER
SERIAL INTERFACE
SLAS431B – JUNE 2005 – REVISED OCTOBER 2006
The architecture of each channel of the DAC8554
consists of a resistor-string DAC followed by an
output buffer amplifier. Figure 45 shows a simplified
block diagram of the DAC architecture.
Figure 45. DAC8554 Architecture
The input coding for each device is unipolar straight
binary, so the ideal output voltage is given by:
where DIN = decimal equivalent of the binary code
that is loaded to the DAC register; it can range from
0 to 65535.
The resistor string section is shown in Figure 46. It is
simply a divide-by-2 resistor followed by a string of
Figure 46. Resistor String
resistors. The code loaded into the DAC register
determines at which node on the string the voltage is
tapped off. This voltage is then applied to the output
The write sequence begins by bringing the SYNC
amplifier by closing one of the switches connecting
line LOW. Data from the DIN line are clocked into the
the string to the amplifier.
24-bit shift register on each falling edge of SCLK.
The serial clock frequency can be as high as 50MHz,
making the DAC8554 compatible with high-speed
DSPs. On the 24th falling edge of the serial clock,
Each output buffer amplifier is capable of generating
the last data bit is clocked into the shift register and
rail-to-rail voltages on its output that approaches an
the shift register gets locked. Further clocking does
output range of 0V to AVDD (gain and offset errors
not change the shift register data. Once 24 bits are
must be taken into account). Each buffer is capable
locked into the shift register, the eight MSBs are
of driving a load of 2k
in parallel with 1000pF to
used as control bits and the 16 LSBs are used as
GND. The source and sink capabilities of the output
data. After receiving the 24th falling clock edge, The
amplifier can be seen in the Typical Characteristics.
DAC8554 decodes the eight control bits and 16 data
bits to perform the required function, without waiting
for a SYNC rising edge. A new SPI sequence starts
The DAC8554 uses a 3-wire serial interface (SYNC,
at the next falling edge of SYNC. A rising edge of
SCLK, and DIN), which is compatible with SPI,
SYNC before the 24-bit sequence is complete resets
QSPI, and Microwire interface standards, as well
the SPI interface; no data transfer occurs.
as most DSPs. See the Serial Write Operation timing
diagram for an example of a typical write sequence.
14
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相关代理商/技术参数 |
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|---|---|
| DAC8554IPWRG4 | 功能描述:数模转换器- DAC 16-Bit Quad Ch UltLo Glitch Vltg Output 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 |
| DAC8555 | 制造商:BB 制造商全称:BB 功能描述:16-BIT, QUAD CHANNEL, ULTRALOW GLITCH, VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTER |
| DAC8555EVM | 功能描述:数据转换 IC 开发工具 QUAD CH. DAC RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| DAC8555IPW | 功能描述:数模转换器- DAC 16-Bit Quad Ch UltLo Glitch Vltg Output 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 |
| DAC8555IPW | 制造商:Texas Instruments 功能描述:IC DAC 16BIT QUAD 16-TSSOP 制造商:Texas Instruments 功能描述:IC, DAC 16BIT QUAD 16-TSSOP 制造商:Texas Instruments 功能描述:IC, DAC 16BIT QUAD 16-TSSOP; Resolution (Bits):16bit; Sampling Rate:200kSPS; Input Channel Type:Serial; Supply Voltage Range:2.7V to 5.5V; Digital IC Case Style:TSSOP; No. of Pins:16; Data Interface:3 Wire, Serial; Supply ;RoHS Compliant: Yes |
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