MAX5878EGK+D【PDF 8/19 页】IC DAC 16BIT DUAL 250MSPS 68-QFN

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MAX5878

16-Bit, 250Msps, High-Dynamic-Performance,

Dual DAC with LVDS Inputs

______________________________________________________________________________________

The analog and digital power-supply inputs AVDD3.3,

AVCLK, and DVDD3.3 allow a +3.135V to +3.465V sup-

ply voltage range. The analog and digital power-supply

inputs AVDD1.8 and DVDD1.8 allow a +1.71V to +1.89V

supply voltage range.

The MAX5878 is packaged in a 68-pin QFN-EP pack-

age, providing greater design flexibility, increased ther-

mal efficiency, and optimized DAC AC performance.

The EP enables the use of necessary grounding tech-

niques to ensure highest performance operation.

Thermal efficiency is not the key factor, since the

MAX5878 features low-power operation. The exposed

pad ensures a solid ground connection between the

DAC and the PCB’s ground layer.

The data converter die attaches to an EP lead frame with

the back of this frame exposed at the package bottom

surface, facing the PCB side of the package. This allows

for a solid attachment of the package to the PCB with

standard infrared reflow (IR) soldering techniques. A spe-

cially created land pattern on the PCB, matching the size

of the EP (6mm x 6mm), ensures the proper attachment

and grounding of the DAC. Designing vias into the land

area and implementing large ground planes in the PCB

design allow for the highest performance operation of the

DAC. Use an array of at least 4 x 4 vias (

≤ 0.3mm diame-

ter per via hole and 1.2mm pitch between via holes) for

this 68-pin QFN-EP package. Connect the MAX5878

exposed paddle to GND. Vias connect the land pattern

to internal or external copper planes. Use as many vias

as possible to the ground plane to minimize inductance.

Static Performance Parameter Definitions

Integral Nonlinearity (INL)

Integral nonlinearity is the deviation of the values on an

actual transfer function from either a best straight-line fit

(closest approximation to the actual transfer curve) or a

line drawn between the end points of the transfer func-

tion, once offset and gain errors have been nullified.

For a DAC, the deviations are measured at every indi-

vidual step.

Differential Nonlinearity (DNL)

Differential nonlinearity is the difference between an

actual step height and the ideal value of 1 LSB. A DNL

error specification of less than 1 LSB guarantees a

monotonic transfer function.

Offset Error

The offset error is the difference between the ideal and

the actual offset current. For a DAC, the offset point is

the average value at the output for the two midscale

digital input codes with respect to the full scale of the

DAC. This error affects all codes by the same amount.

Gain Error

A gain error is the difference between the ideal and the

actual full-scale output voltage on the transfer curve,

after nullifying the offset error. This error alters the slope

of the transfer function and corresponds to the same

percentage error in each step.

MAX5878

OUTIP/OUTQP

OUTIN/OUTQN

DATA15–DATA0

GND

OUTP

OUTN

Figure 8. Differential Output Configuration

MAX5878

OUTIP/OUTQP

OUTIN/OUTQN

DATA15–DATA0

0.1

AVDD1.8

DVDD1.8

0.1

AVDD3.3

DVDD3.3

0.1

AVCLK

BYPASSING—DAC LEVEL

*BYPASS EACH POWER-SUPPLY PIN INDIVIDUALLY.

Figure 9. Recommended Power-Supply Decoupling and

Bypassing Circuitry

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