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參數(shù)資料
| 型號(hào)： | AD5546 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | DAC |
| 英文描述： | Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| 中文描述： | 電流輸出，并行輸入，16-/14-Bit乘法數(shù)模轉(zhuǎn)換器4象限電阻 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 683K |
| 代理商： | AD5546 |
AD5546/AD5556
DIGITAL SECTION
The AD5546/AD5556 have 16-/14-bit parallel inputs. The
devices are double-buffered with 16-/14-bit registers. The
double-buffered feature allows the update of several AD5546/
AD5556 simultaneously. For AD5546, the input register is
loaded directly from a 16-bit controller bus when the WR pin is
brought low. The DAC register is updated with data from the
input register when LDAC is brought high. Updating the DAC
register updates the DAC output with the new data (see
Figure 19). To make both registers transparent, tie WR low and
LDAC high. The asynchronous RS pin resets the part to zero
scale if MSB pin = 0, and midscale if MSB pin = 1.
Rev. 0 | Page 12 of 16
ESD PROTECTION CIRCUITS
All logic input pins contain back-biased ESD protection Zeners
connected to ground (GND) and V
DD
, as shown in Figure 20. As
a result, the voltage level of the logic input should not be greater
than the supply voltage.
0
5k
DIGITAL
INPUTS
DGND
V
DD
Figure 20. Equivalent ESD Protection Circuits
AMPLIFIER SELECTION
In addition to offset voltage, the bias current is important in op
amp selection for precision current output DACs. An input bias
current of 30 nA in the op amp contributes to 1 LSB in the
AD5546’s full-scale error. Op amps OP1177 and AD8628 are
good candidates for the I-V conversion.
REFERENCE SELECTION
The initial accuracy and the rated output of the voltage refer-
ence determine the full span adjustment. The initial accuracy is
usually a secondary concern in precision, as it can be trimmed.
Figure 25 shows an example of a trimming circuit. The zero
scale error can also be minimized by standard op amp nulling
techniques.
The voltage reference temperature coefficient and long-term
drift are primary considerations. For example, a 5 V reference
with a TC of 5 ppm/
o
C means that the output changes by 25 μV
per degree Celsius. As a result, the reference that operates at
55
o
C contributes an additional 750 μV full-scale error.
Similarly, the same 5 V reference with a ±50 ppm long-term
drift means that the output may change by ±250 μV over time.
Therefore, it is practical to calibrate a system periodically to
maintain its optimum precision.
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| AD5546BRU | Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5546BRU-REEL7 | Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5556CRU | Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5556CRU-REEL7 | Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD5556 | Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5546BRU | 功能描述:IC DAC 16BIT PARALL IN 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD5546BRU-REEL7 | 功能描述:IC DAC 16BIT PAR IN 28-TSSOP TR RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
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| AD5546BRUZ | 制造商:Analog Devices 功能描述:16BIT DAC PARALLEL O/P SMD 5546 |
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