Specifications

28 SAM0025A-062397 ESS Technology, Inc.
ES1879 DATA SHEET
ANALOG DESIGN CONSIDERATIONS
PRELIMINARY
ANALOG DESIGN CONSIDERATIONS
This section describes design considerations related to
inputs and outputs of analog signals and related pins on
the chip.
Reference Generator
Reference generator pin CMR is connected through
bypass capacitors to analog ground.
Figure 14 Reference Generator Pin Diagram
Switch-Capacitor Filter
The outputs of the FOUT_L and FOUT_R filters must be
AC-coupled to the inputs CIN_L and CIN_R, respectively,
which provides for DC blocking and an opportunity for low-
pass filtering with capacitors to analog ground at these
inputs.
Figure 15 Switch-Capacitor Filter Pin Diagram
Audio Inputs and Outputs
Analog inputs MIC, stereo LINE, stereo AUXA, and stereo
AUXB are to be capacitively coupled to their respective
input signals. All have pull-up resistors to CMR.
ES1879 analog outputs AOUT_L and AOUT_R are
intended to be AC-coupled to an amplifier, volume control
potentiometer, or line-level outputs.
ES1879
CMR
+47
µ
F
.1
µ
F
ES1879
FOUT_L
CIN_L
.22
µ
F
.22
µ
F
FOUT_R
CIN_R
.001
µ
F
.001
µ
F