xe3006 Semtech Corporation, xe3006 Datasheet - Page 10

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xe3006

Manufacturer Part Number
xe3006
Description
Sandman? Codec | Semtech
Manufacturer
Semtech Corporation
Datasheet

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2.1.9
The Sandman™ function monitors the signals, which are processed in the ADC signal, channel and the DAC signal
channel. The logic output signal SMDA indicates whether the DAC signal channel processes an audio signal or only
noise, and this for certain duration. The reference signal amplitude can be selected through register P, the time window
parameters are the off time and on time (registers L, M and N).
The logic output SMDA can be employed to power-down other devices in the application, such as an external audio
power amplifier. By setting bit 4 in register I, the on-chip DAC signal channel can be powered-down through SMDA too.
The Sandman™ function is illustrated in Figure 9 and is valid for both SMAD (related to the ADC signal) and SMDA
(related to the DAC signal).
© Semtech 2005
Sandman™ DAC Function
On-time counter
Off-time counter
SMAD
(SMDA)
AIN/SDO
(AOUT/SDI)
Figure 9: Implementation of the Sandman function for the DAC (SMDA)
FSYNC
BCLK
SDI
1 2
Figure 10: Illustration of the Sandman™ function.
Serial Audio
Interface
3
on-time
4
Sandman
Interface
5
6
10
PWM
7
DAC
Reg I, bit 4
amplifier
Power
8
9
Time step = 1/fs = 1/FSYNC
SMDA
VDDPA
AOUTP
AOUTN
VSSPA
off-time
XE3005/XE3006
- reference
+ reference
10 time
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