AVDD C1 D R1 C2 AVDD C1 " />
參數(shù)資料
型號： ADUC7122BBCZ
廠商： Analog Devices Inc
文件頁數(shù)： 28/96頁
文件大?。?/td> 0K
描述： IC ARM7TDMI MCU 126KB 108CSPBGA
特色產(chǎn)品： ADuC7122 Precision Analog Microcontroller
標(biāo)準(zhǔn)包裝： 1
系列： MicroConverter® ADuC7xxx
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 41.78MHz
連通性： I²C，SPI，UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 126KB（63K x 16）
程序存儲器類型： 閃存
RAM 容量： 8K x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 13x12b，D/A 12x12b
振蕩器型： 內(nèi)部
工作溫度： -10°C ~ 95°C
封裝/外殼： 108-LFBGA，CSPBGA
包裝： 托盤
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
AT91SAM9261B-CU MCU ARM9 ULTRA LOW PWR 217-LFBGA
VJ1825A183JBAAT4X CAP CER 0.018UF 50V 5% NP0 1825
ATMEGA128-16MU IC AVR MCU 128K 16MHZ 5V 64-QFN
VJ1825A183KBAAT4X CAP CER 0.018UF 50V 10% NP0 1825
ATMEGA128L-8MU IC AVR MCU 128K 8MHZ 3V 64-QFN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADUC7122BBCZ-RL 功能描述:PRECISION ANALOG MCU I.C RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC7xxx 標(biāo)準(zhǔn)包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND
ADUC7124 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Analog Microcontroller, 12-Bit Analog I/O, Large Memory, ARM7TDMI MCU with Enhanced IRQ Handler
ADUC7124BCPZ126 功能描述:IC DAS MCU ARM7 ADC/DDS 64LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC7xxx 標(biāo)準(zhǔn)包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲器容量:96KB（96K x 8） 程序存儲器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587
ADUC7124BCPZ126-RL 功能描述:IC DAS MCU ARM7 ADC/DDS 64-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC7xxx 標(biāo)準(zhǔn)包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND
ADUC7126BSTZ126 功能描述:IC MCU 16/32B 126KB FLASH 80LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC7xxx 標(biāo)準(zhǔn)包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲器容量:96KB（96K x 8） 程序存儲器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

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

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

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*