AD9786 datasheet(39/60 Pages) AD

39 / 60 page

AD9786

Rev. 0 | Page 39 of 60

POWER DISSIPATION

The AD9786 has seven power supply domains: two 3.3 V analog

domains (AVDD1 and AVDD2), two 2.5 V analog domains

(ADVDD and ACVDD), one 2.5 V clock domain (CLKVDD),

and two digital domains (DVDD, which runs from 2.5 V, and

DRVDD, which can run from 2.5 V or 3.3 V).

The current needed for the 3.3 V analog supplies, AVDD1 and

AVDD2, is consistent across speed and varying modes of the

AD9786. Nominally, the current for AVDD1 is 29 mA across

all speeds and modes, while the current for AVDD2 is 20 mA.

The current for the 2.5 V analog supplies and the digital

supplies varies depending on speed and mode of operation.

Figure 67, Figure 68, and Figure 69 show this variation. Note

that CLKVDD, ADVDD, and ACVDD vary with clock speed

and interpolation rate, but not with modulation rate.

FDATA (MSPS)

250

100

125

150

175

200

225

425

325

300

275

250

225

200

175

400

375

350

150

125

100

1×

2×

2× fs/4

2× fs/8

4×

4× fs/4

4× fs/8

8×

8× fs/4

8× fs/8

Figure 67. DVDD Supply Current vs. Clock Speed, Interpolation, and

Modulation Rates

FDATA (MSPS)

250

100

125

150

175

200

225

2×

1×

4×

8×

Figure 68. CLKVDD Supply Current vs. Clock Speed and Interpolation Rates

FDATA (MSPS)

250

100

125

150

175

200

225

2×

1×

4×

8×

Figure 69. ADVDD and ACVDD Supply Current vs. Clock Speed and

Interpolation Rates

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