- 您现在的位置：买卖IC网 > PDF目录10218 > AD1940YSTZRL (Analog Devices Inc)IC DSP AUDIO 16CH/28BIT 48-LQFP PDF资料下载
参数资料
| 型号： | AD1940YSTZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | IC DSP AUDIO 16CH/28BIT 48-LQFP |
| 标准包装： | 2,000 |
| 系列： | SigmaDSP® |
| 类型： | 音频处理器 |
| 应用： | 车载系统，家庭影院，电视 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
| 配用： | EVAL-AD1940MINIBZ-ND - BOARD EVAL AD1940 MINI SIGMADSP |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
AD1940/AD1941
Rev. B | Page 21 of
36
The four ramping curve types are
Linear—Value slews to target using a fixed step size.
Constant dB—Value slews to target using the current value
to calculate the step size. The resulting curve has a
constant rise and decay when measured in dB.
RC type—Value slews to target using the difference
between target and current values to calculate the step size,
producing a simple RC type curve for rising and falling.
Constant Time—Value slews to the target in a fixed
number of steps in a linear fashion. The control port mute
has no affect on this type.
Table 21. Target/Slew RAM Ramp Type Settings
Setting
Ramp Type
00
Linear
01
Constant dB
10
RC type
11
Constant time
The following sections detail how the control port writes to
the target/slew RAM to control the time constant and ramp
type parameters.
Ramp Types 1 to 3: Linear, Constant dB, RC Type (34-Bit
Write)
The target word for the first three ramp types is broken up into
three parts. The 34-bit command is written with six leading 0s
to extend the data write to five bytes. The parts of the target
RAM write are the following:
Ramp Type (2 bits)
Time Constant (4 bits)
0000 = Fastest
1111 = Slowest
Data (28 Bits): 5.23 Format
Ramp Type 4—Constant Time (34-Bit Write)
The target word for the constant time ramp type is written in
five parts, with the 34-bit command again written with six
leading zeros to extend the data write to five bytes. The parts of
the constant time target RAM write are the following:
Ramp Type (2 bits).
Update Step (1 bit). Set to 1 when new target is loaded to
trigger step value update. Value is automatically reset after
the step value is updated.
Number of Steps (3 bits). The number of steps that it takes
to slew to the target value is set by these three bits, with the
number of steps equal to 23-bit setting + 6.
000 = 64
001 = 128
010 = 256
011 = 512
100 = 1024
101 = 2048
110 = 4096
111 = 8196
Data (16 bits). 2.14 format.
Reserved (12 bits). When writing to the RAM, these bits
should all be set to 0.
Target and Slew RAM Initialization
On reset, the target/slew RAM initializes to preset values. The
target RAM initializes to a linear ramp type with a time
constant of 5 and the data set to 1.0. The slew RAM initializes to
a value of 1.0. These defaults give a full-scale (1.0 to 0.0) ramp
time of 21.3 ms.
Linear Update Math
Linear math is the addition or subtraction of a constant value
(step). The equation to describe this step size is
()
20
10
13
5
2
×
=
tconst
step
The result of the equation is normalized to a 5.23 data format.
This gives a time constant range from 6.75 ms to 213.4 ms
(–60 dB relative to 0 dB full scale). An example of this kind of
update is shown in Figure 15 and Figure 16. All slew RAM
figure examples, except the half-scale constant time ramp plot,
show an increasing or decreasing ramp between –80 dB and
0 dB (full scale). All figures except the constant time plots
(Figure 19 and Figure 21) use a time constant of 0x7 (0x0 being
the fastest and 0xF being the slowest).
TIME (ms)
OUTPUT
LEVEL
(V)
1
0.4
0.6
0.8
0.2
0
–0.4
–0.2
–1
–0.8
–0.6
010
20
30
04607-0-017
Figure 15. Slew RAM—Linear Update Increasing Ramp
相关PDF资料 |
PDF描述 |
|---|---|
| SP3243EUEA-L/TR | IC TXRX RS232 INTELLIGENT 28SSOP |
| VE-21J-IU-F2 | CONVERTER MOD DC/DC 36V 200W |
| ADAU1446YSTZ-3A-RL | IC SIGMADSP 175MHZ 100LQFP |
| SP3243EUCA-L/TR | IC TXRX RS232 INTELLIGENT 28SSOP |
| SP3232EUEA-L | IC TXRX RS232 ESD 16SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD1941 | 制造商:Analog Devices 功能描述:SIGMADSP MULTICHANNEL 28-BIT AUDIO PROCESSOR - Bulk |
| AD1941YSTZ | 功能描述:IC DSP AUDIO 16CHAN 28BIT 48LQFP RoHS:是 类别:集成电路 (IC) >> 线性 - 音频处理 系列:SigmaDSP® 其它有关文件:STA321 View All Specifications 标准包装:1 系列:Sound Terminal™ 类型:音频处理器 应用:数字音频 安装类型:表面贴装 封装/外壳:64-LQFP 裸露焊盘 供应商设备封装:64-LQFP EP（10x10） 包装:Digi-Reel® 其它名称:497-11050-6 |
| AD1941YSTZ-29 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD1941YSTZ-29-RL | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD1941YSTZRL | 功能描述:IC DSP AUDIO 16CHAN 28BIT 48LQFP RoHS:是 类别:集成电路 (IC) >> 线性 - 音频处理 系列:SigmaDSP® 其它有关文件:STA321 View All Specifications 标准包装:1 系列:Sound Terminal™ 类型:音频处理器 应用:数字音频 安装类型:表面贴装 封装/外壳:64-LQFP 裸露焊盘 供应商设备封装:64-LQFP EP（10x10） 包装:Digi-Reel® 其它名称:497-11050-6 |
发布紧急采购，3分钟左右您将得到回复。