IDT92HDW74E15PRGXB2X8 IDT, Integrated Device Technology Inc, IDT92HDW74E15PRGXB2X8 Datasheet - Page 28

• Manufacturer Part Number: IDT92HDW74E15PRGXB2X8
• Description: IC AUDIO CODEC HD 8CH 48-TQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec, HDr

Specifications of IDT92HDW74E15PRGXB2X8

• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 2 / 5
• Sigma Delta: No
• S/n Ratio, Adcs / Dacs (db) Typ: 86 / 90
• Dynamic Range, Adcs / Dacs (db) Typ: 86 / 90
• Voltage - Supply, Analog: 3.14 V ~ 3.47 V; 3.8 V ~ 4.2 V; 4.28 V ~ 4.73 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-TQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 92HDW74E15PRGXB2X8

TEN CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT
92HDW74E
TEN CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT
1.4.14. PC-Beep
1.4.15. Headphone Drivers
92HDW74E supports both analog and digital PC_Beep functions.
1.4.14.1. Analog PC-Beep
92HDW74E does not support automatic routing of the PC_Beep pin to all outputs when the link is in
reset. Analog PC-Beep may be supported during Link Reset if the mixer is manually configured for
pass-thru. Otherwise, Reset# must be high and Bit_Clk active.
The default values for the vendor specific verb (7EE/FEE in AFG) associated with Analog PC-Beep
are:
•
•
Analog PC-Beep is supported in D3, but may be attenuated or distorted depending on the load-
impedance on the port. Line outputs can drive 10K ohm loads in D3 at 1Vrms, but will be current lim-
ited when driving lower impedance loads. Enabling or disabling analog PC-Beep may cause a click
or pop sound.
1.4.14.2. Digital PC-Beep
This block uses an 8-bit divider value to generate the PC beep from the 48kHz Azalia sync pulse.
The digital PC_Beep block generates the beep tone on all Pin Complexes that are currently config-
ured as outputs. The HD Audio spec states that the beep tone frequency = (48kHz HD Audio SYNC
rate) / (4*Divider), producing tones from 47 Hz to 12 kHz (logarithmic scale). Other audio sources
are disabled when digital PC_Beep is active.
It should be noted that digital PC Beep is disabled if the divider = 00h.
This product implements a +3dBV output option on headphone capable ports. (HP output and line
output levels are defined as 1Vrms at this time with an option to enable +3dBV FSOV using a vendor
specific verb.) The Microsoft Windows Logo Program allows up to the equivalent of 100ohms in
series. However, an output level of +3dBV at the pin is required to support 300mV at the jack with a
32ohm load and 1V with a 320 ohm load. Microsoft allows device and system manufactures to limit
output voltages to address EU safety requirements. (WLP 3.09 - please refer to the latest Windows
Logo Program requirements from Microsoft.) 92HDW74E, however, requires external components
(series resistors) to limit the output voltage to 150mV with a 32 ohm load or secure software limiting
by restricting DAC and mixer gain ranges.
Although 3 Headphone amplifiers are present, only two may be used simultaneously.
Performance will degrade when driving more than one set of headphones. Only one set of head-
phones (32 ohm nominal) may be connected to a headphone capable port.
Enable = 0h (Analog PC-Beep disabled - mute)
volume = 3h (0dB)
28
92HDW74E
PC AUDIO
V 1.0 03/08