92hd71b5x5prgxb3x8 Integrated Device Technology, 92hd71b5x5prgxb3x8 Datasheet - Page 11

• Manufacturer Part Number: 92hd71b5x5prgxb3x8
• Description: Four Channel Hd Audio Codec, Low Power Optimized, 4-ports, 95db Snr
• Manufacturer: Integrated Device Technology

4-CHANNEL HD AUDIO CODECS OPTIMIZED FOR LOW POWER
92HD71B5
4-CHANNEL HD AUDIO CODECS OPTIMIZED FOR LOW POWER
1.4.
Detailed Description
1.4.1.
1.4.2.
1.4.3.
Low-voltage High Definition Audio Link Signaling
The 92HD71B5 is compatible with either 1.5 V or 3.3 V High Definition Audio Link signaling; the volt-
age selection is performed dynamically based on the input voltage of DVDD_IO. Note that DVDD_IO
is not a logic configuration pin but provides the digital power supply to be used for the High Definition
Audio Link signals.
When in 1.5 V mode, the 92HD71B5 can correctly decode BITCLK, SYNC, RESET# and SDO
because they operate at 1.5 V. Additionally, it will drive SDI_CODEC at 1.5 V. None of the GPIOs are
affected, as they always function at their nominal voltage (DVDD or AVDD).
Port Functionality
Single function (Input only / output only) ports allow for the highest possible performance.
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•
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Note
tional gain increases greater than 6dB may result in significant audio quality degradation of the
microphone audio input. In particular, when the 40dB MIC boost is active, the SNR, THD+N and DC
offset will significantly degrade regardless of the input signal level.
Port Characteristics
Ports are designed to be dedicated inputs or outputs only. Universal (Bi-directional) jacks are not
supported. Port A is designed to drive a set of 32 ohm (nominal) headphones or a 10K (nominal)
load with on board shunt resistance as low as 20K ohms (typical - used to maintain coupling CAP
bias.) Line Level outputs are intended to drive an external 10K speaker 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 47K impedance (nominal) at the pin.
DAC full scale outputs and intended full scale input levels are 1V rms. Line output ports and Head-on
output ports on the 92HD71B5 may be configured for +3dBV full scale output levels by using a ven-
dor 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 D3 as long as AVDD
is available. Unused ports should be left unconnected. When updating existing designs to use
92HD71B5, ensure that there are no conflicts between the output ports on 92HD71B5 and existing
circuitry.
Port A supports
• Headphone Out
• Line Out
Port D supports
• Line Out
Ports B and C support
• Line In
• Mic with 0/10/20/30/40 dB Mic boost
Mono Output cannot be reconfigured
4
: 40dB boost requires using the IDT driver. When the 40dB mic boost feature is enabled, addi-
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92HD71B5
PC AUDIO
V 1.0, 01/08