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參數(shù)資料
| 型號： | DAC8814IBDB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Quad, Serial Input 16-Bit Multiplying Digital-to-Analog Converter |
| 中文描述： | 四，串行輸入16位乘法數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 23/31頁 |
| 文件大?。?/td> | 264K |
| 代理商： | DAC8814IBDB |
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www.ti.com
P
V
OUT
V
REF
D
65536
(1)
RRR
2R
2R
2R
R
5 k
S2
S1
From Other DACS A
GND
V
CC
Digital Interface Connections Omitted For Clarity.
Switches S1 and S2 are Closed, V
DD
Most be Powered.
DGND
V
REF
X
V
DD
R
FB
X
I
OUT
X
A
GND
F
A
GND
X
DAC8814
SBAS338–JANUARY 2005
The DAC is designed to operate with both negative or positive reference voltages. The V
DD
power pin is only
used by the logic to drive the DAC switches on and off. Note that a matching switch is used in series with the
internal 5 k
feedback resistor. If users are attempting to measure the value of R
, power must be applied to
V
DD
in order to achieve continuity. An additional V
SS
bias pin is used to guard the substrate during high
temperature applications to minimize zero-scale leakage currents that double every 10
°
C. The DAC output
voltage is determined by V
REF
and the digital data (D) according to Equation 1:
Note that the output polarity is opposite of the V
REF
polarity for dc reference voltages.
Figure 54. Typical Equivalent DAC Channel
The DAC is also designed to accommodate ac reference input signals. The DAC8814 accommodates input
reference voltages in the range of -12 V to +12 V. The reference voltage inputs exhibit a constant nominal input
resistance of 5 k
,
±
30%. On the other hand, the DAC outputs I
OUT
A, B, C, D are code-dependent and produce
various output resistances and capacitances.
The choice of external amplifier should take into account the variation in impedance generated by the DAC8814
on the amplifiers' inverting input node. The feedback resistance, in parallel with the DAC ladder resistance,
dominates output voltage noise. For multiplying mode applications, an external feedback compensation capacitor
(C
FB
) may be needed to provide a critically damped output response for step changes in reference input
voltages.
Figure 26 shows the gain vs frequency performance at various attenuation settings using a 23 pF external
feedback capacitor connected across the I
OUT
X and R
FB
X terminals. In order to maintain good analog
performance, power supply bypassing of 0.01 μF, in parallel with 1 μF, is recommended. Under these conditions,
clean power supply with low ripple voltage capability should be used. Switching power supplies is usually not
suitable for this application due to the higher ripple voltage and P
SS
frequency-dependent characteristics. It is
best to derive the DAC8814 5-V supply from the system analog supply voltages. (Do not use the digital 5-V
supply.) See Figure 55.
23
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC8814IBDBR | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Quad Ser Inp Multiplying Cnvtr 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)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8814IBDBRG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Quad Serial Input Mult DAC 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)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8814IBDBT | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Quad Ser Inp Multiplying Cnvtr 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)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8814IBDBTG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Quad Serial Input Mult DAC 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)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8814ICDB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Quad, Serial Input 16-Bit Multiplying Digital-to-Analog Converter |
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