ad1988a Analog Devices, Inc., ad1988a Datasheet - Page 9

• Manufacturer Part Number: ad1988a
• Description: High Definition Audio Soundmax Codec
• Manufacturer: Analog Devices, Inc.

Mnemonic
PORT-C_L, PORT-C_R
AV
AV
VREF_FILT
MIC_BIAS-B
MIC_BIAS-C
MIC_BIAS-F
MIC_BIAS-E
MIC_BIAS-D
MIC_BIAS_FILT
SENSE_B/SRC_A
PORT-D_L, PORT-D_R
MIC_BIAS-A
PORT-A_L, PORT-A_R
MONO_OUT
PORT-G_L, PORT-G_R
PORT-H_L, PORT-H_R
S/PDIF_IN/GPIO_1
S/PDIF_OUT
DD
SS
Pin
Number
23, 24
25, 38
26, 42
27
28
29
30
31
32
33
34
35, 36
37
39, 41
40
43, 44
45, 46
47
48
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
I
I
I
Description
Rear Panel Line-In/Surround Back Output. Analog input/output.
Analog Supply Voltage. 3.3 V only. Caution: Do not apply 5.0 V to this pin. AV
well regulated and filtered because supply noise degrades audio performance.
Analog Supply Return (Ground). AV
under, or close to, the AD1988A/AD1988B.
Voltage Reference Filter. This pin must be connected to filter capacitors: 1.0 μF and 0.1 μF
connected in parallel between Pin 27 and AV
Switchable Microphone Bias for PORT-B. Capable of:
Switchable Microphone Bias for PORT-C. This pin has the same function as MIC_BIAS-B.
Switchable Microphone Bias for PORT-F. This pin has the same function as MIC_BIAS-B.
Switchable Microphone Bias for PORT-E. This pin has the same function as MIC_BIAS-B.
Switchable Microphone Bias for PORT-D. This pin has the same function as MIC_BIAS-B.
Filter for Microphone Bias Boost Circuitry. Connect this pin to 5.0 V via a low-pass filter. When
connected in this way, the AD1988A/AD1988B are each capable of providing 3.95 V as a
microphone bias to all of the MIC_BIAS pins. If 5 V is not available, connect this pin to 3.3 V (AV
via a low-pass filter. The AD1988A/AD1988B produce a MIC_BIAS voltage relative to the AV
supply (typically 3.1 V @ AV
Jack Sense E to Jack Sense H Input/Sense A Drive.
Left and Right Rear Panel Headphone (Front Line Out)/Stereo MIC In. Analog input/output.
Switchable Microphone Bias for PORT-A. This pin has the same function as MIC_BIAS-B.
Left and Right Front Panel Headphone Output/Stereo MIC In. Analog input/output.
Monaural Output to Internal Speaker or Telephony Subsystem. Line level output only.
Left and Right Rear Panel C/LFE Output/Line Input.
Left and Right Rear Panel Surround Center/Side Output/Line Input. Analog input/output.
S/PDIF_IN/GPIO Pin. S/PDIF_IN supports S/PDIF input. When enabled, GPIO_1 can be used as a
GPIO pin.
S/PDIF_OUT. Supports S/PDIF output.
Input: line level input, supports microphones with MIC_BIAS and boost amplifiers.
Output: line level output, capable of driving headphone load and power.
Input: line level input, supports microphones with MIC_BIAS and boost amplifiers.
Output: line level output, capable of driving headphone load and power.
Input: line level input.
Output: line level output.
Input: line level input.
Output: line level output.
Input: line level input, supports microphones with MIC Bias and boost amplifiers.
Output: line level output only.
High-Z, 0 V, 1.65 V, 3.78 V, and 3.95 V (with 5.0 V on Pin 33).
High-Z, 0 V, 1.65 V, 2.86 V, and 3.10 V (with 3.3 V on Pin 33).
Rev. 0 | Page 9 of 20
DD
= 3.3 V).
SS
should be connected to DV
SS
(Pin 26).
SS
using a conductive trace
AD1988A/AD1988B
DD
supplies should be
DD
DD
)