92HD91 Datasheet, PDF (13/298 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.1.1. Port Characteristics
Universal (Bi-directional) jacks are supported on ports A,C, E, and F. Ports A and B are designed to
drive 32 ohm (nominal) headphones or a 10K (nominal) load. Line Level outputs are intended to
drive an external 10K load (nominal) and an on board shunt resistor of 20-47K (nominal). However,
applications may support load impedances of 5K ohms and above. Input ports are 50K (nominal) at
the pin.
DAC full scale outputs and intended full scale input levels are 1V rms at 5V. Line output ports and
Headphone output ports on the 92HD91 codec may be configured for +3dBV full scale output levels
by using a vendor specific verb.
Output ports are always on to prevent pops/clicks associated with charging and discharging output
coupling capacitors. This maintains proper bias on output coupling caps even in power state D3 as
long as AVDD is available. Unused ports should be left unconnected. When updating existing
designs to use the 92HD91 codec, ensure that there are no conflicts between the output ports on the
92HD91 codec and existing circuitry.
AFG
Power
State
D0-D2
D3
D3cold
Input Output Used as output
Enable Enable for DAC/Mixer
Used as output
for analog
PC_Beep
Used as
input for
ADC, mixer
Port Behavior
1
1
Don't care
Don't care
Yes
Not allowed. Port is active as input.
No
Not allowed. Inactive (Power Down) - Port keeps
output coupling caps charged if port uses caps.
1
0
NA
NA
Yes
Active - Port enabled as input
1
0
NA
NA
No
Inactive (Power Down) - Port keeps output coupling
caps charged if port uses caps.
currently used by DAC, mixer,
0
1
beep, or is traditional line or
headphone output
NA
0
1
not currently used by DAC, mixer,
beep and is capless HP/BTL port
Active - Port enabled as output
Inactive (Power Down)
0
0
NA
NA
NA
Inactive (Power Down) - Port keeps output coupling
caps charged if port uses caps.
1
1
NA
NA
Don't care
Not allowed. Inactive (Power Down) - Port keeps
output coupling caps charged if port uses caps.
1
0
NA
NA
Don't care
Inactive (Power Down) - Port keeps output coupling
caps charged if port uses caps.
0
1
currently used by DAC, mixer,
beep, or is traditional line or
headphone output
Don't care
Low power state. If enabled, Beep will output from
the port
0
1
not currently used by DAC, mixer,
beep and is capless HP/BTL port
Don't care
Inactive (Power Down)
0
0
NA
NA
Don't care
Inactive (Power Down) - Port keeps output coupling
caps charged if port uses caps.
-
-
Inactive (lower power) - Port keeps output coupling
caps charged if port uses caps.
Table 2. Analog Output Port Behavior
IDT™ CONFIDENTIAL
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92HD91