IDT92HDW74C25PRGXC1X IDT, Integrated Device Technology Inc, IDT92HDW74C25PRGXC1X Datasheet - Page 30

• Manufacturer Part Number: IDT92HDW74C25PRGXC1X
• Description: IC AUDIO CODEC HD 6CH 48-TQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec, HDr

Specifications of IDT92HDW74C25PRGXC1X

• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 2 / 3
• 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
• Package Type: TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 92HDW74C25PRGXC1X

SIX CHANNEL HD AUDIO CODEC
92HDW74C2
SIX CHANNEL HD AUDIO CODEC
the volume in the Volume Knob widget and take appropriate action. Indirect mode is particularly use-
ful when it is undesirable to control all of the DAC amplifier volumes at the same time, or when imple-
menting ADC volume control.
In indirect mode, there are only 128 volume levels in the Volume Knob Cntrl volume bits, the value
will not go beyond the lower and upper limits (0x0 or 0x7F), and an unsolicited response will be gen-
erated if an input event tries to go beyond these limits. Therefore, it is the responsibility of the con-
trolling software to monitor the volume in the Volume Knob Widget and take appropriate action.
Indirect mode is enabled by clearing bit 7 in the Volume Knob Cntrl verb (F0F). The volume is
reflected in the Volume Knob Cntrl bits 6:0 and the step size is 0.75dB. In direct mode, software can
read or write the volume in the Volume Knob widget.
1.4.17.3. Hardware Implementation
The Volume Knob interface is comprised of two input pins, CODEC pins 2 and 4. Both pins have
internal pull-up resistors, so only two push button switches are required for most implementations.
Typically, a series resistor and shunt capacitor are used to help reduce noise and prevent damage
from ESD and other potential faults. An example circuit is shown below in below.
Figure 9: External Volume Control Circuit
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92HDW74C2
PC AUDIO
V 1.0 03/08