IDTSTAC9750XXTAEC1XR IDT, Integrated Device Technology Inc, IDTSTAC9750XXTAEC1XR Datasheet - Page 69

• Manufacturer Part Number: IDTSTAC9750XXTAEC1XR
• Description: IC CODEC AC'97 2CH VALUE 48-LQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec '97r

Specifications of IDTSTAC9750XXTAEC1XR

• Resolution (bits): 18 b, 20 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 85 / 89
• Voltage - Supply, Analog: 3.14 V ~ 3.47 V; 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 3.14 V ~ 3.47 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: STAC9750XXTAEC1XR

14. APPENDIX A: SPLIT INDEPENDENT POWER SUPPLY OPERATION
IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
In PC applications, one power supply input to the STAC9750/9751 may be derived from a supply
regulator (as shown in Figure 24) and the other directly from the PCI power supply bus. When power
is applied to the PC, the regulated supply input to the IC will be applied some time delay after the
PCI power supply. Without proper on-chip partitioning of the analog and digital circuitry, some manu-
facturer's CODECs would be subject to on-chip SCR type latch-up.
IDT’s STAC9750/9751 specifically allows power-up sequencing delays between the analog (AVddx)
and digital (VDddx) supply pins. These two power supplies can power-up independently and at dif-
ferent rates with no adverse effects to the CODEC. The IC is designed with independent analog and
digital circuitry that prevents on-chip SCR type latch-up.
However, the STAC9750/9751 is not designed to operate for extended periods with only the analog
supply active.
Note: Pin 48:
To Enable SPDIF, use a 1 K
To Disable SPDIF, use a 1 K
Do NOT leave Pin 48 floating.
Ω
Ω
-10 K
-10 K
69
Ω
Ω
external pulldown.
external pullup.
STAC9750/9751
PC AUDIO
V 5.8 103106