AVDD C1 D R1 C2 AVDD C1 " />
參數(shù)資料
型號(hào)： EVAL-ADUC7122QSPZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 28/96頁(yè)
文件大小： 0K
描述： BOARD EVALUATION FOR ADUC7122
設(shè)計(jì)資源： EVAL-ADUC7122 Schematic
ADUC7122 Gerber Files
ADUC7122 BOM
標(biāo)準(zhǔn)包裝： 1
系列： MicroConverter® ADuC7xxx
類型： MCU
適用于相關(guān)產(chǎn)品： ADUC7122
所含物品： 板
ADuC7122
Rev. 0 | Page 34 of 96
AVDD
C1
D
R1 C2
AVDD
C1
D
R1 C2
08
75
5-
02
2
Figure 22. Equivalent Analog Input Circuit Conversion Phase:
Switches Open, Track Phase: Switches Closed
For ac applications, removing high frequency components from
the analog input signal is recommended through the use of an
RC low-pass filter on the relevant analog input pins. In applications
where harmonic distortion and signal-to-noise ratio are critical,
the analog input should be driven from a low impedance source.
Large source impedances significantly affect the ac performance
of the ADC and can necessitate the use of an input buffer amplifier.
The choice of the op amp is a function of the particular application.
Figure 23 and Figure 24 give an example of an ADC front end.
0
875
5-
0
23
ADuC7122
ADC0
10
0.01F
Figure 23. Buffering Single-Ended/Pseudo Differential Input
08
75
5-
0
24
ADuC7122
ADC0
VREF
ADC1
Figure 24. Buffering Differential Inputs
When no amplifier is used to drive the analog input, the source
impedance should be limited to values lower than 1 kΩ. The
maximum source impedance depends on the amount of total
harmonic distortion (THD) that can be tolerated. The THD
increases as the source impedance increases and the
performance degrades.
DRIVING THE ANALOG INPUTS
Internal or external reference can be used for the ADC. In
differential mode of operation, there are restrictions on the
common-mode input signal (VCM) that are dependent on
reference value and supply voltage used to ensure that the signal
remains within the supply rails.
Table 35 gives some calculated VCM minimum and VCM
maximum values under various AVDD and VREF conditions.
Table 35. VCM Ranges
AVDD
VREF
VCM Min
VCM Max
Peak-to-Peak Signal
3.3 V
2.5 V
1.25 V
2.05 V
2.5 V
2.048 V
1.024 V
2.276 V
2.048 V
1.25 V
0.75 V
2.55 V
1.25 V
3.0 V
2.5 V
1.25 V
1.75 V
2.5 V
2.048 V
1.024 V
1.976 V
2.048 V
1.25 V
0.75 V
2.25 V
1.25 V
BAND GAP REFERENCE
The ADuC7122 provides an on-chip band gap reference of
2.5 V that can be used for the ADC and for the DAC. This
2.5 V reference is generated from a 1.2 V reference.
This internal reference also appears on the VREF_1.2 and
VREF_2.5 pins. When using the internal reference, a 470 nF
capacitor must be connected between VREF_1.2 and AGND and
a 470 nF capacitor between VREF_2.5 pin and AGND to ensure
stability and fast response during ADC conversions.
The band gap reference also connects through buffers to the
BUF_VREF1 and the BUF_VREF2 pins, which can be used as a
reference for other circuits in the system. A minimum of 0.1 μF
capacitor should be connected to these pins to damp noise.
The band gap reference interface consists of an 8-bit REFCON
MMR, described in Table 36. It is recommended to enable
REFCON Bit 0 and Bit 1 when performing an ADC or DAC
conversion that uses the internal reference.
An external reference can be used for an ADC conversion.
To perform an ADC conversion with an external 2.5 V refer-
ence, clear REFCON[1] and apply the external reference to
the VREF_2.5 pin. To apply an external 1.2 V reference, clear
REFCON[0] and apply the external reference to the VREF_1.2 pin.
Note that when applying an external reference to the VREF_1.2
pin, this internally influences the 2.5 V reference as the 2.5 V
reference is generated from the 1.2 V reference.
相關(guān)PDF資料
PDF描述
EVAL-ADUC7124QSPZ BOARD EVALUATION FOR ADUC7124
ECM30DCWN CONN EDGECARD 60POS DIP .156 SLD
EVAL-ADUC7121QSPZ BOARD EVALUATION FOR ADUC7121
EVAL-ADUC7126QSPZ BOARD EVALUATION FOR ADUC7126
REC5-243.3SRWZ/H4/A CONV DC/DC 5W 9-36VIN 3.3VOUT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-ADUC7124QSPZ 功能描述:BOARD EVALUATION FOR ADUC7124 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:MicroConverter® ADuC7xxx 標(biāo)準(zhǔn)包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁(yè)面:659 (CN2011-ZH PDF)
EVAL-ADUC7126QSPZ 功能描述:BOARD EVALUATION FOR ADUC7126 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:MicroConverter® ADuC7xxx 標(biāo)準(zhǔn)包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁(yè)面:659 (CN2011-ZH PDF)
EVAL-ADUC7128QSPZ 功能描述:KIT DEV FOR ADUC7128 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ PLUS 套件 產(chǎn)品培訓(xùn)模塊:Blackfin® Processor Core Architecture Overview Blackfin® Device Drivers Blackfin® Optimizations for Performance and Power Consumption Blackfin® System Services 特色產(chǎn)品:Blackfin? BF50x Series Processors 標(biāo)準(zhǔn)包裝:1 系列:Blackfin® 類型:DSP 適用于相關(guān)產(chǎn)品:ADSP-BF548 所含物品:板，軟件，4x4 鍵盤，光學(xué)撥輪，QVGA 觸摸屏 LCD 和 40G 硬盤 配用:ADZS-BFBLUET-EZEXT-ND - EZ-EXTENDER DAUGHTERBOARDADZS-BFLLCD-EZEXT-ND - BOARD EXT LANDSCAP LCD INTERFACE 相關(guān)產(chǎn)品:ADSP-BF542BBCZ-4A-ND - IC DSP 16BIT 400MHZ 400CSBGAADSP-BF544MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542KBCZ-6A-ND - IC DSP 16BIT 600MHZ 400CSBGAADSP-BF547MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF548BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF547BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF544BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF542BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGA
EVAL-ADUC7128QSPZ2 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Analog Microcontroller ARM7TDMI MCU with 12-Bit ADC and DDS DAC
EVAL-ADUC7129QSPZ 制造商:Analog Devices 功能描述:- Bulk
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*