XE3005I064TRLF Semtech, XE3005I064TRLF Datasheet - Page 10

• Manufacturer Part Number: XE3005I064TRLF
• Description: IC CODEC LOW PWR 16BIT 20-UCSP
• Manufacturer: Semtech
• Type: Audio Codecr

Specifications of XE3005I064TRLF

• Data Interface: Serial
• Resolution (bits): 16 b
• Number Of Adcs / Dacs: 1 / 1
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 78 / 78
• Dynamic Range, Adcs / Dacs (db) Typ: 78 / 78
• Voltage - Supply, Analog: 1.8 V ~ 3.6 V
• Voltage - Supply, Digital: 1.8 V ~ 3.6 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-UCSP®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: XE3005I064TR

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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