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參數(shù)資料
| 型號(hào)： | DAC8812B |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Dual, Serial Input 16-Bit Multiplying Digital-to-Analog Converter |
| 中文描述： | 雙路，串行輸入16位乘法數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 1671K |
| 代理商： | DAC8812B |
www.ti.com
A
B
Address
Decoder
ShiftRegister
EN
ToInputRegister
CS
CLK
SDI
POWER ON RESET
When the V
power supply is turned on, an internal reset strobe forces all the Input and DAC registers to the
zero-code state or half-scale, depending on the MSB pin voltage. The V
DD
power supply should have a smooth
positive ramp without drooping, in order to have consistent results, especially in the region of V
DD
= 1.5 V to
2.3 V. The DAC register data stays at zero or half-scale setting until a valid serial register data load takes place.
ESD Protection Circuits
250
W
DGND
DIGITAL
INPUTS
V
DD
PCB LAYOUT
The DAC8812 is a high-accuracy DAC that can have its performance compromised by grounding and printed
circuit board (PCB) lead trace resistance. The 16-bit DAC8812 with a 10-V full-scale range has an LSB value of
153 mV. The ladder and associated reference and analog ground currents for a given channel can be as high as
2 mA. With this 2-mA current level, a series wiring and connector resistance of only 76 m
will cause 1 LSB of
voltage drop. The preferred PCB layout for the DAC8812 is to have all A
GND
X pins connected directly to an
analog ground plane at the unit. The noninverting input of each channel I/V converter should also either connect
directly to the analog ground plane or have an individual sense trace back to the A
GND
X pin connection. The
feedback resistor trace to the I/V converter should also be kept short and have low resistance in order to prevent
IR drops from contributing to gain error. This attention to wiring ensures the optimal performance of the
DAC8812.
DAC8812
SBAS349A–AUGUST 2005–REVISED DECEMBER 2005
Figure 33
shows the equivalent logic interface for the key digital control pins for the DAC8812.
Figure 33. DAC8812 Equivalent Logic Interface
Two additional pins RS and MSB provide hardware control over the preset function and DAC register loading. If
these functions are not needed, the RS pin can be tied to logic high. The asynchronous input RS pin forces all
input and DAC registers to either the zero-code state (MSB = 0), or the half-scale state (MSB = 1).
All logic-input pins contain back-biased ESD protection zener diodes connected to ground (DGND) and V
DD
as
shown in
Figure 34
.
Figure 34. Equivalent ESD Protection Circuits
14
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| DAC8812C | Dual, Serial Input 16-Bit Multiplying Digital-to-Analog Converter |
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| DAC8814ICDB | Quad, Serial Input 16-Bit Multiplying Digital-to-Analog Converter |
| DAC8820IB | 16-Bit, Parallel Input Multiplying Digital-to-Analog Converter |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC8812C | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, Serial Input 16-Bit Multiplying Digital-to-Analog Converter |
| DAC8812IBPW | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Serial Input Multiplying 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 |
| DAC8812IBPW | 制造商:Texas Instruments 功能描述:D/A Converter (D-A) IC |
| DAC8812IBPWG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Serial Input Multiplying 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 |
| DAC8812IBPWR | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Serial Input Multiplying 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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