DAC38RF80IAAV datasheet(71/160 Pages) TI2

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Table 7-41. DAC output current (continued)

DACFS (7.5.72)

Signal current (mA)

Total bias current (mA)(1)

(1)

The bias current per each complementary output is half the total bias current

An external decoupling capacitor CEXT of 0.1 μF should be connected externally to terminal EXTIO for

compensation. RBIAS of 3.6 kΩ is recommended for setting the full-scale output current.

7.3.27 Current Steering DAC Architecture

The DACs in the DAC38RFxx consist of a segmented array of NMOS current sources, capable of sinking a

full-scale output current up to 40 mA (see Figure 7-27). Differential current switches direct the current to either

one of the complimentary output nodes VOUT1/2+ or VOUT1/2-. On the DAC38RF80/90/84 with integrated

balun, these output nodes are internal to the device. Complimentary output currents enable differential operation,

thus canceling out common mode noise sources (digital feed-through, on-chip and PCB noise), dc offsets, even

order distortion components, and increasing signal output power by a factor of four.

VDEE18N

(-1.8V)

VOUT1/2+

VOUT1/2-

100 :

Zext+

Zext-

VDDOUT18

IOUT+

IOUT-

Figure 7-27. Current Steering DAC Architecture

Referring to Figure 7-27, the total output current IOUTFS is fixed, and is switched to either the + or – output by

switches S(N):

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DAC38RF80, DAC38RF83, DAC38RF84

DAC38RF85, DAC38RF90, DAC38RF93

SLASEA3D – DECEMBER 2016 – REVISED DECEMBER 2023

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