- 您现在的位置：买卖IC网 > PDF目录17040 > EVAL-AD7686CBZ (Analog Devices Inc)BOARD EVALUATION FOR AD7686 PDF资料下载
参数资料
| 型号： | EVAL-AD7686CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7686 |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行 |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 15mW @ 500kSPS，5 V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7686 |
| 已供物品： | 板 |
| 相关产品： | AD7686CCPZRL7TR-ND - IC ADC 16BIT SAR 500KSPS 10LFCSP AD7686CCPZRL-ND - IC ADC 16BIT SAR 500KSPS 10LFCSP AD7686BCPZRL7TR-ND - IC ADC 16BIT 500KSPS 10-LFCSP AD7686BCPZRL-ND - IC ADC 16BIT 500KSPS 10-LFCSP AD7686CRMZ-ND - IC ADC 16BIT 500KSPS 10MSOP AD7686BRMZ-ND - IC ADC 16BIT 500KSPS 10-MSOP AD7686CRMZRL7-ND - IC ADC 16BIT 500KSPS 10MSOP AD7686BRMZRL7-ND - IC ADC 16BIT 500KSPS 10MSOP |
第1页第2页第3页第4页第5页当前第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
AD7686
Rev. B | Page 14 of 28
ANALOG INPUT
Figure 27 shows an equivalent circuit of the input structure
of the AD7686. The two diodes, D1 and D2, provide ESD
protection for the analog inputs IN+ and IN. Care must be
taken to ensure that the analog input signal never exceeds the
supply rails by more than 0.3 V because this causes these
diodes to begin to forward-bias and start conducting current.
These diodes can handle a forward-biased current of 130 mA
maximum. For instance, these conditions could eventually
occur when the input buffer’s (U1) supplies are different from
VDD. In such a case, an input buffer with a short-circuit
current limitation can be used to protect the part.
CIN
RIN
D1
D2
CPIN
IN+
OR IN–
GND
VDD
02
96
9-
02
7
Figure 27. Equivalent Analog Input Circuit
The analog input structure allows the sampling of the
differential signal between IN+ and IN. By using this
differential input, small signals common to both inputs are
rejected, as shown in Figure 28, which represents the typical
CMRR over frequency. For instance, by using IN to sense a
remote signal ground, ground potential differences between
the sensor and the local ADC ground are eliminated.
0
29
69-
028
FREQUENCY (kHz)
10000
1
10
100
1000
CM
RR
(
d
B)
80
70
60
50
40
VDD = 5V
Figure 28. Analog Input CMRR vs. Frequency
During the acquisition phase, the impedance of the analog
inputs (IN+ or IN) can be modeled as a parallel combination
of capacitor, CPIN, and the network formed by the series
connection of RIN and CIN. CPIN is primarily the pin capacitance.
RIN is typically 600 Ω and is a lumped component made up of
some serial resistors and the on resistance of the switches. CIN is
typically 30 pF and is mainly the ADC sampling capacitor.
During the conversion phase, where the switches are opened,
the input impedance is limited to CPIN. RIN and CIN make a
1-pole, low-pass filter that reduces undesirable aliasing effects
and limits the noise.
When the source impedance of the driving circuit is low, the
AD7686 can be driven directly. Large source impedances
significantly affect the ac performance, especially THD. The dc
performances are less sensitive to the input impedance. The
maximum source impedance depends on the amount of THD
that can be tolerated. The THD degrades as a function of the
source impedance and the maximum input frequency, as shown
in Figure 29.
0
29
69-
030
FREQUENCY (kHz)
100
025
50
75
T
HD
(
d
B)
–80
–85
–90
–95
–100
–105
–110
RS = 33
RS = 50
RS = 100
RS = 250
Figure 29. THD vs. Analog Input Frequency and Source Resistance
相关PDF资料 |
PDF描述 |
|---|---|
| HBC06DRTH-S93 | CONN EDGECARD 12POS DIP .100 SLD |
| MCP355XDV-MS1 | BOARD DEV SENSOR APP MCP355X |
| UPB2D681MRD | CAP ALUM 680UF 200V 20% RADIAL |
| MLG1005S68NJ | INDUCTOR MULTILAYER 68NH 0402 |
| GCC06DRYI-S93 | CONN EDGECARD 12POS DIP .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7686SDZ | 功能描述:数据转换 IC 开发工具 EVAL BOARD 100Ksps/400Ksps 16 bit I.C 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 |
| EVAL-AD7687CB | 制造商:Analog Devices 功能描述:EVAL BOARD 16-BIT, 250KSPS DIFFER . I.C. - Bulk |
| EVAL-AD7687CBZ | 功能描述:BOARD EVALUATION FOR AD7687 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7687SDZ | 功能描述:BOARD EVAL FOR AD7687 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7688CB | 制造商:Analog Devices 功能描述:EVAL BD FOR USE W/ EITHER THE ANLG DEVICES - Bulk |
发布紧急采购，3分钟左右您将得到回复。