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參數(shù)資料
| 型號(hào)： | AD5547BRU-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.5 us SETTLING TIME, 16-BIT DAC, PDSO38 |
| 封裝： | MO-153BD-1, TSSOP-38 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 481K |
| 代理商： | AD5547BRU-REEL7 |
AD5547/AD5557
DIGITAL SECTION
The AD5547/AD5557 have 16-/14-bit parallel inputs. The
devices are double-buffered with 16-/14-bit registers. The dou-
ble-buffered feature allows the simultaneous update of several
AD5547/AD5557s. For the AD5547, the input register is loaded
directly from a 16-bit controller bus when WR 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 the
MSB pin = 0, and to midscale if the MSB pin = 1.
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.
Rev. 0 | Page 13 of 20
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. A 30 nA input
bias current in the op amp contributes to 1 LSB in the AD5547’s
full-scale error. The OP1177 and AD8628 op amps are good
candidates for the I-V conversion.
Reference Selection
The initial accuracy and rated output of the voltage reference
determine the full-span adjustment. The initial accuracy of the
reference is usually a secondary concern because it can be
trimmed. Figure 26 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/°C means the output changes by 25 μV/°C.
As a result, a reference operating at 55°C contributes an
additional 750 μV full-scale error.
Similarly, the same 5 V reference with a ±50 ppm long-term
drift means the output may change by ±250 μV over time.
Therefore, it is practical to calibrate a system periodically to
maintain its optimum precision.
PCB LAYOUT, POWER SUPPLY BYPASSING, AND
GROUND CONNECTIONS
It is a good practice to employ a compact, minimum-lead length
PCB layout design. The leads to the input should be as short as
possible to minimize IR drop and stray inductance.
The PCB metal traces between V
REF
and R
FB
should also be
matched to minimize gain error.
It is also essential to bypass the power supply with quality
capacitors for optimum stability. Supply leads to the device
should be bypassed with 0.01 μF to 0.1 μF disc or chip ceramic
capacitors. Low ESR 1 μF to 10 μF tantalum or electrolytic
capacitors should also be applied at the supply in parallel with
the ceramic capacitor to minimize transient disturbance and
filter out low frequency ripple.
To minimize the digital ground bounce, the AD5547/AD5557
DGND terminal should be joined with the AGND terminal at a
single point. Figure 21 illustrates the basic supply-bypassing
configuration and AGND/DGND connection for the
AD5547/AD5557.
V
DD
AGND
DGND
C1
C2
5V
–
+
1
μ
F
0.1
μ
F
0
AD5547/AD5557
Figure 21. Power Supply Bypassing
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| AD5547BRUZ | 功能描述:IC DAC 16BIT DUAL 38-TSSOP RoHS:是 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:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 設(shè)置時(shí)間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| AD5547CRUZ | 功能描述:IC DAC 16BIT PAR DUAL 38TSSOP RoHS:是 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:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 設(shè)置時(shí)間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| AD5547CRUZ-REEL7 | 功能描述:IC DAC 16BIT PAR DUAL 38TSSOP RoHS:是 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 |
| AD5547-EP | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual-Current Output, Parallel Input |
| AD5547SRU-EP | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual-Current Output, Parallel Input |
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