- 您现在的位置：买卖IC网 > PDF目录17040 > ADS1259EVM (Texas Instruments)EVAL MODULE FOR ADS1259 PDF资料下载
参数资料
| 型号： | ADS1259EVM |
| 厂商： | Texas Instruments |
| 文件页数： | 5/48页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR ADS1259 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 14k |
| 数据接口： | 串行，SPI? |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | ADS1259 |
| 已供物品： | 板 |
| 其它名称： | 296-29312 ADS1259EVM-ND |
第1页第2页第3页第4页当前第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页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
2nd-Order
2nd-Stage
DS
2nd-Order
1st-Stage
DS
AnalogInput(V )
IN
4th-OrderModulator
ToDigitalFilter
f
=f
MOD
CLK/8
ln
FSR
RMSNoise
ln(2)
ENOB=
SBAS424D
– JUNE 2009 – REVISED AUGUST 2011
NOISE PERFORMANCE
MODULATOR
The ADS1259 offers excellent noise performance that
The
high-performance
modulator
is
an
can be optimized by adjusting the data rate and by
inherently-stable, fourth-order,
ΔΣ, 2 + 2 pipelined
selection of the digital filter mode. As the averaging is
structure, as shown in Figure 33. It shifts the
increased by reducing the data rate, the noise drops
quantization noise to a higher frequency (out of the
correspondingly.
Additionally,
because
the
sinc2
passband) where digital filtering can easily remove it.
digital filter provides more filtering than the sinc1
digital filter, sinc2 provides lower noise conversions.
Table 1 shows the noise as a function of data rate
and filter mode.
Table 1 expresses typical noise data in several ways:
RMS noise, effective number of bits (ENOB), and
noise-free bits. ENOB is calculated from Equation 1:
Figure 33. Fourth-Order Modulator
Where:
FSR = 2VREF
(1)
The modulator first stage converts the analog input
voltage into a pulse-code modulated (PCM) stream.
The calculation of noise-free bits uses the same
When the level of differential analog input (AINP
–
formula as Equation 1, except that the peak-to-peak
AINN) is near the level of the reference voltage
noise value is used instead of RMS noise.
(VREFP
– VREFN), the 1s density of the PCM data
stream is at its highest. When the level of the
ADC
differential analog input is near zero, the PCM 0s and
1s densities are nearly equal. At the two extremes of
The analog-to-digital converter (ADC) section of the
the analog input levels (+FS and
–FS), the 1s density
ADS1259 is composed of two blocks: a high accuracy
of the PCM streams are approximately +90% and
modulator and a programmable digital filter.
+10%, respectively.
The modulator second stage produces a 1s density
data stream designed to cancel the quantization
noise of the first stage. The data streams of the two
stages are then combined in the digital filter stage.
Table 1. Typical Noise Data vs Data Rate and Digital Filter(1)
SINC1 DIGITAL FILTER
SINC2 DIGITAL FILTER
DATA
RATE
SAMPLE
NOISE
ENOB
NOISE-
NOISE
ENOB
NOISE-
(SPS)
SIZE(2)
(
μVRMS)
(
μVPP)
(RMS)
FREE BITS
(
μVRMS)
(
μVPP)
(RMS)
FREE BITS
10
128
0.5
1.8
23.3
21.4
0.45
1.6
23.4
21.6
16.6
256
0.55
2.4
23.1
21.0
0.5
2
23.3
21.3
50
512
0.65
3.5
22.9
20.4
0.6
3
23.0
20.7
60
512
0.7
4
22.8
20.3
0.65
3.5
22.9
20.4
400
4096
1.4
9.5
21.8
19.0
1.2
8.3
22.0
19.2
1200
8192
2.3
17
21.1
18.2
2
14
21.3
18.4
3600
8192
3.9
32
20.3
17.3
3.4
27
20.5
17.5
14400
8192
6.2
50
19.6
16.6
(3)
(1)
Noise data taken with shorted analog inputs and internal 2.5V reference using the circuit of Figure 64.
(2)
Data sample sizes used for analysis.
(3)
Same as sinc1 mode.
Copyright
2009–2011, Texas Instruments Incorporated
13
相关PDF资料 |
PDF描述 |
|---|---|
| 0210490281 | CABLE JUMPER 1.25MM .076M 22POS |
| EBC19DREN-S93 | CONN EDGECARD 38POS .100 EYELET |
| EEC19DRYN-S93 | CONN EDGECARD 38POS DIP .100 SLD |
| EBC19DREH-S93 | CONN EDGECARD 38POS .100 EYELET |
| MLK1005S2N4S | INDUCTOR MULTILAYER 2.4NH 0402 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS1259EVM | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
| ADS1259EVM-PDK | 功能描述:数据转换 IC 开发工具 ADS1259 Perf Demo Kit RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| ADS1259EVM-PDK | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
| ADS1259IPW | 功能描述:模数转换器 - ADC Low-Noise 14kSPS 24B ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS1259IPW | 制造商:Texas Instruments 功能描述:A/D CONVERTER (A-D) IC |
发布紧急采购，3分钟左右您将得到回复。