Datasheet > AD5744R_08

AD5744R_08

更新时间： 2024-01-10 08:45:10

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
32页	654K
描述
Complete Quad, 14-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC

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AD5744R_08 数据手册

AD5744R

LAYOUT GUIDELINES

In any circuit where accuracy is important, careful considera-

tion of the power supply and ground return layout helps to ensure

the rated performanceꢀ Design the PCB on which the AD5744R

is mounted such that the analog and digital sections are separated

and confined to certain areas of the boardꢀ If the AD5744R is in

a system where multiple devices require an AGNDx-to-DGND

connection, establish the connection at one point onlyꢀ Establish

the star ground point as close as possible to the deviceꢀ The

AD5744R should have ample supply bypassing of 10 μF in parallel

with 0ꢀ1 μF on each supply located as close to the package as

possible, ideally right up against the deviceꢀ The 10 μF capaci-

tors are of the tantalum bead typeꢀ The 0ꢀ1 μF capacitor should

have low effective series resistance (ESR) and low effective series

inductance (ESI), such as the common ceramic types that

provide a low impedance path to ground at high frequencies to

handle transient currents due to internal logic switchingꢀ

through on the boardꢀ A microstrip technique is recommended

but not always possible with a double-sided boardꢀ In this

technique, the component side of the board is dedicated to the

ground plane, and the signal traces are placed on the solder sideꢀ

GAꢁVANICAꢁꢁY ISOꢁATED INTERFACE

In many process control applications, it is necessary to provide

an isolation barrier between the controller and the unit being

controlled to protect and isolate the controlling circuitry from

any hazardous common-mode voltages that may occurꢀ Isocou-

plers provide voltage isolation in excess of 2ꢀ5 kVꢀ The serial

loading structure of the AD5744R makes it ideal for isolated

interfaces because the number of interface lines is kept to a min-

imumꢀ Figure 44 shows a 4-channel isolated interface to the

AD5744R using an ADuM1400 iCoupler® productꢀ For more

information on iCoupler products, refer to wwwꢀanalogꢀcomꢀ

MICROPROCESSOR INTERFACING

The power supply lines of the AD5744R should use as large a

trace as possible to provide low impedance paths and reduce

the effects of glitches on the power supply lineꢀ Shield fast-

switching signals, such as clocks with digital ground to avoid

radiating noise to other parts of the board; they should never be

run near the reference inputsꢀ A ground line routed between

the SDIN and SCLK lines helps reduce cross-talk between themꢀ

(A ground line is not required on a multi-layer board because

it has a separate ground plane; however, it is helpful to separate

the linesꢀ) It is essential to minimize noise on the reference inputs

because it couples through to the DAC outputꢀ Avoid crossover

of digital and analog signalsꢀ Run traces on opposite sides of the

board at right angles to each other to reduce the effects of feed-

Microprocessor interfacing to the AD5744R is accomplished

using a serial bus that uses standard protocol that is compatible

with microcontrollers and DSP processorsꢀ The communications

channel is a 3-wire (minimum) interface consisting of a clock

signal, a data signal, and a synchronization signalꢀ The AD5744R

requires a 24-bit data-word with data valid on the falling edge

of SCLKꢀ

For all the interfaces, a DAC output update can be performed

automatically when all the data is clocked in, or it can be done

LDAC

under the control of

ꢀ The contents of the DAC register

can be read using the readback functionꢀ

MICROCONTROLLER

SERIAL CLOCK OUT

ADuM1400*

ENCODE

DECODE

TO SCLK

TO SDIN

TO SYNC

TO LDAC

SERIAL DATA OUT

SYNC OUT

CONTROL OUT

*ADDITIONAL PINS OMITTED FOR CLARITY.

Figure 44. Isolated Interface

Rev. A | Page 29 of 32

1...26 27 282930 31 32

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与AD5744R_08相关器件

型号	品牌	获取价格	描述	数据表
AD5744RBSUZ	ADI	获取价格	Complete Quad, 14-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC
AD5744RBSUZ-REEL7	ADI	获取价格	Complete Quad, 14-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC
AD5744RCSUZ	ADI	获取价格	Complete Quad, 14-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC
AD5744RCSUZ	ROCHESTER	获取价格	SERIAL INPUT LOADING, 8 us SETTLING TIME, 14-BIT DAC, PQFP32, ROHS COMPLIANT, PLASTIC, MS-
AD5744RCSUZ-REEL7	ADI	获取价格	Complete Quad, 14-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC
AD5748	ADI	获取价格	Industrial Current/Voltage Output Driver with Programmable Ranges
AD5748_1	ADI	获取价格	Industrial Current/Voltage Output Driver with Programmable Ranges
AD5748ACPZ	ADI	获取价格	Industrial Current/Voltage Output Driver with Programmable Ranges
AD5748ACPZ-RL7	ADI	获取价格	Industrial Current/Voltage Output Driver with Programmable Ranges
AD5749	ADI	获取价格	Industrial Current Out Driver, Single-Supply, 55 V Maximum Supply, Programmable Ranges

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