參數(shù)資料
型號(hào)： AD1954YSTZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 36/36頁(yè)
文件大?。?/td> 0K
描述： IC DAC AUDIO 3CHAN 26BIT 48LQFP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 1
系列： SigmaDSP®
位數(shù)： 26
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 3
電壓電源： 模擬和數(shù)字
功率耗散（最大）： 510mW
工作溫度： -40°C ~ 105°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 托盤(pán)
輸出數(shù)目和類(lèi)型： 6 電壓，單極
采樣率（每秒）： 48k
AD1954
–9–
An extensive SPI port allows click-free parameter updates, along
with read-back capability from any point in the algorithm flow.
The AD1954 includes ADI’s patented multibit - DAC architec-
ture.This architecture provides 112 dB SNR and dynamic range
and THD+N of –100 dB.These specifications allow the AD1954
to be used in applications ranging from low-end boom boxes to
high-end professional mixing/editing systems.
The AD1954 also has a digital output that allows it to be used
purely as a DSP.This digital output can also be used to drive an
external DAC to extend the number of channels beyond the three
that are provided on the chip.
This chip can be used with either its default signal processing
program or with a custom user-designed program. Graphical pro-
gramming tools are available from ADI for custom programming.
FEATURES
The AD1954 is comprised of a 26-bit DSP (48 bits with double
precision) for interpolation and audio processing, three multibit
- modulators, and analog output drive circuitry. Other features
include an on-chip parameter RAM that uses a safe-upload feature
for transparent and simultaneous updates of filter coefficients and
digital de-emphasis filters. Also, on-chip input selectors allow up
to three sources of serial data and master clock to be selected.
The 3-channel configuration is especially useful for 2.1 playback
systems that include two satellite speakers and a subwoofer.
The default program allows for independent equalization and
compression/limiting for the satellite and subwoofer outputs.
Figure 1 shows the block diagram of the device.
The AD1954 contains a program RAM that boots from an internal
program ROM on power-up. Signal processing parameters are
stored in a 256-location parameter RAM, which is initialized on
power-up by an internal boot ROM. New values are written to
the parameter RAM using the SPI port.The values stored in the
parameter RAM control the IIR equalization filters, the dual-
band compressor/limiter, the delay values, and the settings of the
stereo spreading algorithm.
The AD1954 has a very sophisticated SPI port that supports
complete read/write capability of both the program and the para-
meter RAM.Two control registers are also provided to control
the chip serial modes and various other optional features. Hand-
shaking is also included for ease of memory uploads/downloads.
The AD1954 contains four independent data capture circuits,
which can be programmed to tap the signal flow of the processor
at any point in the DSP algorithm flow.These captured signals
can be accessed either through a separate serial out pin (i.e., that
can be connected to an external DAC or DSP) or by reading from
the data capture SPI registers.This allows the basic functionality
of the AD1954 to be easily extended.
The processor core in the AD1954 has been designed from the
ground up for straightforward coding of sophisticated compres-
sion/limiting algorithms.The AD1954 contains two independent
compressor/limiters with rms based amplitude detection and
attack/hold/release controls, together with an arbitrary compression
curve that is loaded by the user into a look-up table that resides
in the parameter RAM.The compressor also features look-ahead
compression that prevents compressor overshoots.
GENERAL DESCRIPTION (continued from page 1)
3:1
AUDIO
DATA
MUX1
3
SPI PORT
3:1
MCLK
MUX1
DAC – L
COEFFICIENT
ROM
64 22
26 22
DSP CORE
DATA FORMAT:
3.23 (SINGLE PRECISION)
3.45 (DOUBLE PRECISION)
3
ANALOG
OUTPUTS
MASTER
CLOCK I/O
GROUP
DCSOUT
SPI I/O
GROUP
3
SERIAL
IN1
DATA MEMORY, 512 26
CONTROL
REGISTERS
TRAP REG.
(I2S, SPI)
SAFELOAD
REGISTERS
PROGRAM
RAM
512 35
PARAMETER
RAM
256 22
BOO
T
R
O
M
BOO
T
R
O
M
MEMORY CONTROLLERS
DAC – R
DAC – SW2
BIAS
ANALOG
BIAS GROUP
RESETB
MUTE DE-EMPHASIS
ZEROFLAG
NOTES
1CONTROLLEDTHROUGH SPI CONTROL REGISTERS.
2DAC DOES NOT USE DIGITAL INTERPOLATION.
SERIAL DATA I/O
GROUP
DCSOUT TRAP
AUX SERIAL
DATA INPUT
MCLK
GENERATOR1
(256
fS/512 fS IN)
256
fS/512 fS OUT
VOLTAGE
REFERENCE
VREF
DVDD
AVDD
ODVDD
3
FILTCAP
AGND
DGND
3
2
Figure 1. Block Diagram
REV. A
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參數(shù)描述
AD1954YSTZRL 功能描述:IC DAC AUDIO 3CHAN 26BIT 48LQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:SigmaDSP® 標(biāo)準(zhǔn)包裝:47 系列:- 設(shè)置時(shí)間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類(lèi)型:1 電流，單極；1 電流，雙極 采樣率（每秒）:*
AD1954YSZ 制造商:Analog Devices 功能描述:DAC 3-CH Delta-Sigma 24-bit 44-Pin MQFP
AD1955 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:High Performance Multibit DAC with SACD Playback
AD1955ARS 制造商:Rochester Electronics LLC 功能描述:24 BIT 192KHZ DAC 123 DB DNR WITH SACD - Bulk 制造商:Analog Devices 功能描述:IC DAC 24-BIT
AD1955ARSRL 制造商:Analog Devices 功能描述:DAC 2-CH Delta-Sigma 24-bit 28-Pin SSOP T/R 制造商:Rochester Electronics LLC 功能描述:24 BIT 192KHZ DAC 123 DB DNR WITH SACD - Bulk
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