Datasheet > AD5744R_08

AD5744R_08

更新时间： 2024-01-02 20:10:18

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

APPLICATIONS INFORMATION

Initial accuracy error on the output voltage of an external refer-

ence could lead to a full-scale error in the DACꢀ Therefore, to

minimize these errors, a reference with low initial accuracy

error specification is preferredꢀ Choosing a reference with an

output trim adjustment, such as the ADR425, allows a system

designer to trim system errors out by setting the reference

voltage to a voltage other than the nominalꢀ The trim adjustment

can also be used at temperature to trim out any errorꢀ

TYPICAꢁ OPERATING CIRCUIT

Figure 43 shows the typical operating circuit for the AD5744Rꢀ

The only external components needed for this precision 14-bit

DAC are decoupling capacitors on the supply pins and reference

inputs and an optional short-circuit current setting resistorꢀ

Because the AD5744R incorporates a voltage reference and

reference buffers, it eliminates the need for an external bipolar

reference and associated buffers, resulting in an overall savings

in both cost and board spaceꢀ

Long term drift is a measure of how much the reference output

voltage drifts over timeꢀ A reference with a tight long-term drift

specification ensures that the overall solution remains relatively

stable over its entire lifetimeꢀ

In Figure 43, AV_DDis connected to +15 V, and AV_SSis connected

to −15 V; but AV_DDand AV_SScan operate with supplies from

11ꢀ4 V to 1ꢁꢀ5 ꢀ In Figure 43, AGNDx is connected to

REFGNDꢀ

The temperature coefficient of a reference output voltage affects

INL, DNL, and TUEꢀ A reference with a tight temperature coef-

ficient specification should be chosen to reduce the dependence

of the DAC output voltage on ambient conditionsꢀ

Precision Voltage Reference Selection

To achieve the optimum performance from the AD5744R over

its full operating temperature range, an external voltage reference

must be usedꢀ Care must be taken in the selection of a precision

voltage referenceꢀ The AD5744R has two reference inputs, REFAB

and REFCDꢀ The voltages applied to the reference inputs are used

to provide a buffered positive and negative reference for the DAC

coresꢀ Therefore, any error in the voltage reference is reflected

in the outputs of the deviceꢀ

In high accuracy applications, which have a relatively low noise

budget, reference output voltage noise must be consideredꢀ It is

important to choose a reference with as low an output noise

voltage as practical for the system resolution that is requiredꢀ

Precision voltage references, such as the ADR435 (XFET® design),

produce low output noise in the 0ꢀ1 Hz to 10 Hz regionꢀ However,

as the circuit bandwidth increases, filtering the output of the

reference may be required to minimize the output noiseꢀ

There are four possible sources of error to consider when choosing

a voltage reference for high accuracy applications: initial accuracy,

temperature coefficient of the output voltage, long term drift,

and output voltage noiseꢀ

Table 18. Some Precision References Recommended for Use with the AD5744R

Initial Accuracy

(mV Maximum)

ꢁong-Term Drift

(ppm Typical)

Temperature Drift

(ppm/°C Maximum)

0.1 Hz to 10 Hz Noise

(μV p-p Typical)

Part No.

ADR435

ADR425

ADR02

ADR395

AD586

3.5

3.4

2.5

Rev. A | Page 27 of 32

1...24 25 262728 29 30...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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