AD1988B 데이터 시트보기 (PDF) - Analog Devices
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AD1988B Datasheet PDF : 20 Pages
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AD1988A/AD1988B
Mnemonic
Pin
Number I/O Description
PORT-C_L, PORT-C_R 23, 24 I/O Rear Panel Line-In/Surround Back Output. Analog input/output.
Input: line level input, supports microphones with MIC Bias and boost amplifiers.
Output: line level output only.
AVDD
25, 38
I Analog Supply Voltage. 3.3 V only. Caution: Do not apply 5.0 V to this pin. AVDD supplies should be
well regulated and filtered because supply noise degrades audio performance.
AVSS
26, 42
I Analog Supply Return (Ground). AVSS should be connected to DVSS using a conductive trace
under, or close to, the AD1988A/AD1988B.
VREF_FILT
27
O 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 AVSS (Pin 26).
MIC_BIAS-B
28
O Switchable Microphone Bias for PORT-B. Capable of:
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).
MIC_BIAS-C
29
O Switchable Microphone Bias for PORT-C. This pin has the same function as MIC_BIAS-B.
MIC_BIAS-F
30
O Switchable Microphone Bias for PORT-F. This pin has the same function as MIC_BIAS-B.
MIC_BIAS-E
31
O Switchable Microphone Bias for PORT-E. This pin has the same function as MIC_BIAS-B.
MIC_BIAS-D
32
O Switchable Microphone Bias for PORT-D. This pin has the same function as MIC_BIAS-B.
MIC_BIAS_FILT
33
I 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 (AVDD)
via a low-pass filter. The AD1988A/AD1988B produce a MIC_BIAS voltage relative to the AVDD
supply (typically 3.1 V @ AVDD = 3.3 V).
SENSE_B/SRC_A
34
I/O Jack Sense E to Jack Sense H Input/Sense A Drive.
PORT-D_L, PORT-D_R 35, 36 I/O Left and Right Rear Panel Headphone (Front Line Out)/Stereo MIC In. Analog input/output.
Input: line level input, supports microphones with MIC_BIAS and boost amplifiers.
Output: line level output, capable of driving headphone load and power.
MIC_BIAS-A
37
O Switchable Microphone Bias for PORT-A. This pin has the same function as MIC_BIAS-B.
PORT-A_L, PORT-A_R 39, 41 I/O Left and Right Front Panel Headphone Output/Stereo MIC In. Analog input/output.
Input: line level input, supports microphones with MIC_BIAS and boost amplifiers.
Output: line level output, capable of driving headphone load and power.
MONO_OUT
40
O Monaural Output to Internal Speaker or Telephony Subsystem. Line level output only.
PORT-G_L, PORT-G_R 43, 44
Left and Right Rear Panel C/LFE Output/Line Input.
Input: line level input.
Output: line level output.
PORT-H_L, PORT-H_R 45, 46
Left and Right Rear Panel Surround Center/Side Output/Line Input. Analog input/output.
Input: line level input.
Output: line level output.
S/PDIF_IN/GPIO_1 47
I/O 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
48
O S/PDIF_OUT. Supports S/PDIF output.
Rev. 0 | Page 9 of 20
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