參數(shù)資料
型號(hào)： AD1812JST
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： Silver Mica Capacitor; Capacitance:12pF; Capacitance Tolerance: 5%; Series:CD17; Voltage Rating:500VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:5.9mm; Leaded Process Compatible:No RoHS Compliant: No
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝： TQFP-160
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 339K
代理商： AD1812JST
AD1812
REV. 0
–12–
Power Supplies
Pin Name
P/TQFP
I/O
Description
V
CC
GNDA
V
DD
51, 61, 72
52, 62, 74
6, 17, 28, 91,
94, 104, 107,
116, 126, 132,
135, 140, 146,
149, 154
5, 16, 27, 34, 82,
83, 86, 92, 93,
105, 106, 117,
127, 133, 134,
141, 147, 148,
155
80
79
50
45
I
I
I
Analog Supply Voltage (+5 V).
Analog Ground.
Digital Supply Voltage (+5 V).
GNDD
I
Digital Ground.
ADVDD
ADGND
V
DDG
GNDG
I
I
I
I
Analog/Digital Supply Voltage. Connect to +5 V
CC
.
Analog/Digital Ground. Connect to analog ground plane.
Game Port Digital Voltage Supply. Connect to +5 V
DD
.
Game Port Digital Ground. Connect to the digital ground plane.
(
continued from Page 1
)
HOST PC INTERFACE
All necessary ISA bus interface logic is completely contained on-
chip. This includes address decoding for all onboard resources,
control and signal interpretation, DMA selection and control
logic, IRQ selection and control logic, and all interface configu-
ration logic (see Table IV).
The AD1812 supports a DMA request/grant architecture for
transferring data with the ISA bus. One, two, or three DMA
channels can be supported. Programmed I/O (PIO) mode is
also supported for control register accesses and for applications
lacking DMA control. The AD1812 includes dual DMA count
registers for full-duplex operation enabling simultaneous capture
and playback on separate DMA channels.
The AD1812 is fully configurable according to the Plug and
Play ISA specification. In a non-Plug and Play environment, the
built in Plug and Play protocol can be disabled. When Plug and
Play is disabled, the AD1812 operates under a fixed address
space.
Table IV. Emulated Logical Devices
Logical
Device
Number
PnP
Compatible
Device
Emulated
Device
0
1
2
3
4
5*
Windows Sound System
Sound Blaster Pro v. 2.01
OPL3 Music Synthesizer
MIDI MPU-401 Port
Game/Joystick Port
Modem
—
PNPB002
PNPB020
PNPB006
PNPB02F
PNP0501
*If MODEM_EN is asserted.
WSS COMPATIBLE CODEC
The AD1812 contains the AD1845 SoundPort Stereo Codec for
business audio support and multimedia applications. The codec
includes stereo audio converters, complete on-chip filtering,
MPC Level-2 compliant analog mixing, programmable gain and
attenuation, a variable sample frequency generator, and FIFOs
buffering the ISA bus.
The codec includes a stereo pair of
∑
analog-to-digital con-
verters and a stereo pair of
∑
digital-to-analog converters. In-
puts to the ADC can be selected from four stereo pairs of analog
signals: line (LINE), microphone (MIC), auxiliary line #1
(AUX1), and post-mixed DAC output. In addition, an analog
mixer allows a mono input (MONO_IN), MIC, AUX1, LINE
and auxiliary line #2 (AUX2) to be mixed with the DACs’ out-
put. A software-controlled programmable gain stage allows in-
dependent gain for each channel going into the ADC. The
ADCs’ output can be digitally mixed with the DACs’ input.
The pair of 16-bit outputs from the ADCs are available over a
16-bit bidirectional interface that also supports 16-bit digital in-
put to the DACs and control information. The codec can accept
and generate 16-bit twos-complement PCM linear (big endian
or little endian) digital data, 4-bit IMA-ADPCM compatible
digital data, 8-bit unsigned magnitude PCM linear data, and
8-bit
μ
-law or A-law companded digital data.
The AD1812 includes a variable sample frequency generator,
which allows the codec to instantaneously change sample rates
from 5.5 kHz to 50 kHz with a resolution of 1 Hz. This is a su-
perb way to create special audio effects.
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