ES9038PRO datasheet(12/58 Pages) ESS

12 / 58 page

CONFIDENTIAL ADVANCE INFORMATION v3.6

March 5, 2019

ES9038PRO Flagship 32-Bit HyperStream® II 8-Channel Audio DAC

ESS TECHNOLOGY, INC. 237 South Hillview Drive, Milpitas, CA 95035, USA. Tel (408) 643-

8800 • Fax (408) 643-8801

Paralleling the Outputs of the ES9038PRO

Figure 1 Paralleled DAC Output

Paralleling DAC outputs as shown in Figure 1 is a technique used to further improve DNR and SNR performance. The

ES9038PRO has a low output impedance (typ. 202

) and paralleling DAC outputs will further reduce the output impedance.

Paralleling 4 channels as shown in Figure 1 will result in a 50

 output impedance. Paralleling 8 channels will result in 25.

Many op amps used for the I/V stage (U1 and U3) to drive such a low impedance will have difficulty maintaining low THD and

linearity. For the ES9038PRO, it is recommended to parallel DAC outputs after the output of U2 and use a set of op amps

(U1, U2, U3) for all 8 channels.

Power Supplies Concerns when Paralleling DACs

If the ES9038PRO DAC outputs are paralleled to make a stereo DAC (paralleling 4 channels to make 1 channel) or a mono

DAC(paralleling 8 channel to make 1 channel) and the MCLK is greater than 80MHz, the VCC_L, VCC_R, and DVDD power

supplies will need to be increased from 1.2V to 1.3V.

ES9038PRO 数据表(PDF) 12 Page - ESS Technology,Inc