Datasheet

www.ti.com
REFERENCE OUTPUT
+
−
MUX
S0124-01
Electret
Microphone
MINM
MINP
REF
34 dB
 10 mA
6 Ω
REFO
+
(0.5 V
CC
1)
−1 mA
48 Ω
MBIAS
+
(0.75 V
CC
1)
LINE AND MICROPHONE INPUT SELECT INDICATOR
PCM3052A
SLES160 – NOVEMBER 2005
The PCM3052A has a reference output pin (RFFO, pin 32) to supply reference voltage (0.5 V
CC
1) to external
components. The pin has 10-mA sink/source capability with 6- Ω output impedance.
Figure 49. Microphone Amplifier, Microphone Bias Generator, and Reference Output
The PCM3052A employs an indicator pin (L/ M, pin 3) to show which analog input is selected, line or microphone.
Table 3. Line and Microphone Select Indicator
L/ M LINE/MIC SELECT
INDICATOR
LOW Microphone
HIGH Line
28