ADAU1701JSTZ Analog Devices Inc, ADAU1701JSTZ Datasheet - Page 22

• Manufacturer Part Number: ADAU1701JSTZ
• Description: IC AUDIO PROC 2ADC/4DAC 48-LQFP
• Manufacturer: Analog Devices Inc
• Series: SigmaDSP®r
• Type: Audio Processorr

Specifications of ADAU1701JSTZ

• Design Resources: Analog Audio Input, Class-D Output with ADAU1701, SSM2306, and ADP3336 (CN0162)
• Applications: Automotive, Monitors, MP3
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Audio Control Type: Digital
• Control Interface: I2C, Serial
• Supply Voltage Range: 1.8V, 3.3V
• Operating Temperature Range: 0°C To +70°C
• Audio Ic Case Style: LQFP
• No. Of Pins: 48
• Svhc: No SVHC
• Control / Process Application: MP3 Player Speaker Docks, Automotive Head Units, Studio Monitors
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADAU1701MINIZ - BOARD EVAL SIGMADSP AUD ADAU1701EVAL-ADAU1701EBZ - BOARD EVAL FOR ADAU1701
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADAU1701
AUDIO DACs
The ADAU1701 includes four Σ-Δ DACs. The SNR of the DAC
is 104 dB, and the THD + N is −90 dB. A full-scale output on
the DACs is 0.9 V rms (2.5 V p-p).
The DACs are in an inverting configuration. If a signal inversion
from input to output is undesirable, it can be reversed either by
using an inverting configuration for the output filter or by simply
inverting the signal in the SigmaDSP program flow.
The DAC outputs can be filtered with either an active or a
passive reconstruction filter. A single-pole, passive, low-pass
filter with a 50 kHz corner frequency, as shown in Figure 18,
is sufficient to filter the DAC out-of-band noise, although an
active filter may provide better audio performance. Figure 19
DAC_OUT
4.75kΩ
4.75kΩ
150pF
Figure 19. Active DAC Output Filter
Rev. A | Page 22 of 56
470µF
AD8606
C8
47µF
shows a triple-pole, active, low-pass filter that provides a steeper
roll-off and better stop-band attenuation than the passive filter.
In this configuration, the V+ and V− pins of the AD8606 op
amp are set to VDD and ground, respectively.
To properly initialize the DACs, Bits[DS<1:0>] in the DAC
setup register (Address 2087) should be set to 01.
604Ω
3.3nF
DAC_OUT
Figure 18. Passive DAC Output Filter
49.9kΩ
47µF
FILTER_OUT
560Ω
5.6nF
FILTER_OUT