AD1938YSTZRL Analog Devices Inc, AD1938YSTZRL Datasheet - Page 30

• Manufacturer Part Number: AD1938YSTZRL
• Description: IC,Soundcard Circuits,QFP,48PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Type: General Purposer

Specifications of AD1938YSTZRL

• Data Interface: Serial
• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 4 / 8
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 94 / 94
• Dynamic Range, Adcs / Dacs (db) Typ: 105 / 106
• Voltage - Supply, Analog: 3 V ~ 3.6 V
• Voltage - Supply, Digital: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD1938
APPLICATIONS CIRCUITS
Typical applications circuits are shown in Figure 29 through Figure 32. Figure 29 shows a typical ADC input filter circuit. Recommended
loop filters for LR clock and master clock as the PLL reference are shown in Figure 30. Output filters for the DAC outputs are shown in
Figure 31 and Figure 32 for the noninverting and inverting cases.
AUDIO
INPUT
Figure 30. Recommended Loop Filters for LRCLK and MCLK PLL Reference
600Z
AVDD2
100pF
LF
Figure 29. Typical ADC Input Filter Circuit
5.76kΩ
+
LRCLK
3.32kΩ
39nF
2
3
6
5
–
OP275
+
–
OP275
+
2.2nF
5.76kΩ
5.76kΩ
5.76kΩ
120pF
120pF
AVDD2
1
7
LF
4.7µF
4.7µF
+
+
MCLK
562Ω
237Ω
237Ω
5.6nF
NPO
NPO
1nF
1nF
390pF
100pF
ADCxN
ADCxP
Rev. C | Page 30 of 32
DAC OUT
Figure 31. Typical DAC Output Filter Circuit (Single-Ended, Noninverting)
DAC
OUT
Figure 32. Typical DAC Output Filter Circuit (Single-Ended, Inverting)
270pF
11kΩ
11kΩ
NPO
4.75kΩ
VREF
270pF
4.75kΩ
3.01kΩ
NPO
0.1µF
68pF
NPO
2
3
3
2
4.99kΩ
–
OP275
+
OP275
+
–
240pF
NPO
4.99kΩ
1
1
604Ω
604Ω
2.2nF
4.7µF
NPO
+
3.3nF
4.7µF
+
NPO
49.9kΩ
49.9kΩ
AUDIO
OUTPUT
AUDIO
OUTPUT