92hdw74d Integrated Device Technology, 92hdw74d Datasheet - Page 13

• Manufacturer Part Number: 92hdw74d
• Description: 8-channel Hd Audio Codec, Dual Spdif
• Manufacturer: Integrated Device Technology

EIGHT CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT
92HDW74D
EIGHT CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT
30 (CLK=2)
4 (CLK=2)
1.4.
18/19/20
39/41
21/22
23/24
35/36
14/15
16/17
43/44
45/46
Pins
48
40
47
Detailed Description
1.4.1.
1.4.2.
SPDIF_OUT0
SPDIF_OUT1
CD (Port I)
SPDIF_IN
DMIC0
DMIC1
Port
G
H
A
B
C
D
E
F
Port Functionality
Multi-function (Input / output) ports allow for the highest possible flexibility. 8 bi-directional ports (3
headphone capable) support a wide variety of consumer desktop and mobile system use models.
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
Universal (Bi-directional) jacks are supported on all ports except the CD input. Ports A, B, and D are
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 out-
puts are intended to drive an external 10K speaker load (nominal) and an on board shunt resistor of
20K-47K (nominal). However, applications may support load impedances of 5K ohms and above.
Input ports are 47K (nominal) at the pin.
DAC full scale output and intended full scale input levels are 1V rms. Line output ports and Head-
phone output ports on 92HDW74D 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 D3 as long as AVDD
is available. Unused ports should be left unconnected. When updating existing designs to use the
92HDW74D, ensure that there are no conflicts between the output ports on 92HDW74D and existing
circuitry.
1
: 40dB boost requires using the IDT driver. When the 40dB mic boost feature is enabled, addi-
Input
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Output
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Table 1. Port Functionality
Headphone
Yes
Yes
Yes
13
(Vref pin)
Mic Bias
Yes
Yes
Yes
Yes
boost amp
92HDW74D
Input
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1
(pseudo differential)
Yes
CD
PC AUDIO
V 1.0 03/08