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AD1988BJCPZ Scheda tecnica(PDF) 9 Page - Analog Devices |
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AD1988BJCPZ Scheda tecnica(HTML) 9 Page - Analog Devices |
9 / 20 page AD1988A/AD1988B Rev. 0 | Page 9 of 20 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. |
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