AD1984B Просмотр технического описания (PDF) - Analog Devices
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AD1984B Datasheet PDF : 20 Pages
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AD1984B
Table 4. Pin Function Descriptions
Mnemonic
Pin No.
I/O
Description
DIGITAL INTERFACE
SDATA_OUT
5
BIT_CLK
6
SDATA_IN
8
SYNC
10
RESET
11
DIGITAL I/O and EAPD
DM_1/2
2
DM_2
4
DM_CLK
46
GPIO_2
30
MIC_BIAS-E/GPIO_1
31
EAPD/GPIO_0
47
S/PDIF_OUT-2
45
S/PDIF_OUT-1
48
JACK SENSE
SENSE_A/SRC_B
13
SENSE_B/SRC_A
34
ANALOG I/O
PCBEEP
12
Port-E_L
14
Port-E_R
15
Port-F_L
16
Port-F_R
17
CD_GND
19
I
Link Serial Data Output. AD1984B input stream. Clocked on both edges of the
BIT_CLK.
I
Link Bit Clock. 24.000 MHz serial data clock.
I/O
Link Serial Data Input. AD1984B output stream clocked only on one edge of BIT_CLK.
Link Frame Sync.
I
Link Reset. AD1984B master hardware reset.
I
I
Digital microphone 1 and 2 Inputs (for Biphase Microphones), or Digital Microphone
1 Input (for Single-phase Microphones).
I
Digital microphone 2 Input (for Single-phase Microphones).
O
Clock to drive external digital microphones.
I/O
General Purpose Input/Output Pins. Digital signals used to control or sense external
circuitry.
I/O
Microphone Bias for Port E/General-Purpose Input/Output. Capable of High-Z, 1.65 V,
and 2.86 V. Pin 31 shares functionality between MIC_BIAS_E (default) and GPIO_1.
These functions are mutually exclusive and the MIC_BIAS function takes priority over
the GPIO function.
I/O
EAPD/General-Purpose Input/Output pin. Pin 47 shares functionality between
GPIO_0 and EAPD. These functions are mutually exclusive and the EAPD function
takes priority over the GPIO function. By default, the pin is in a High-Z state. External
resistors should be used to ensure the proper circuit state when this pin is in High-Z.
O
Supports S/PDIF Output. Typically used as an audio interface to an external HDMI
encoder.
O
Supports S/PDIF Output.
I/O
Jack Sense A-D Input/Sense B drive.
I/O
Jack Sense E-F Input/Sense A drive.
LI
Monaural Input from System for Analog PCBeep.
LI, MIC, LO Auxiliary Input/Output Left Channel.
LI, MIC, LO Auxiliary Input/Output Right Channel.
LI, LO Auxiliary Input/Output Left Channel.
LI, LO Auxiliary Input/Output Right Channel.
I
CD-Audio-Analog-Ground-Reference. Must be connected to AGND via a 0.1 μF
capacitor if not in use as CD_GND. MUST always be ac-coupled.
Port-B_L
Port-B_R
Port-C_L
Port-C_R
MONO_OUT
Port-D_L
Port-D_R
Port-A_L
Port-A_R
21
LI, MIC Front Panel Stereo MIC/Line-In.
22
LI, MIC Front Panel Stereo MIC/Line-In.
23
LI, MIC Rear Panel Stereo MIC/Line-In.
24
LI, MIC Rear Panel Stereo MIC/Line-In.
32
LO
Monaural Output to Internal Speaker or Telephony Subsystem Speakerphone.
35
HP, LO Rear Panel Headphone/Line-Out.
36
HP, LO Rear Panel Headphone/Line-Out.
39
HP, LO Front Panel Headphone/Line-Out.
41
HP, LO Front Panel Headphone/Line-Out.
The symbols used in this table are defined as: I = input, O = output, LI = line level input, LO = line level output, HP = output capable of driving
headphone load, MIC = input supports microphones with MIC bias and boost amplifier.
Rev. 0 | Page 10 of 20 | February 2008
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