参数资料
型号: ADUC7128BSTZ126-RL
厂商: Analog Devices Inc
文件页数: 32/92页
文件大小: 0K
描述: IC DAS MCU ARM7 ADC/DDS 64-LQFP
产品培训模块: ARM7 Applications & Tools
Intro to ARM7 Core & Microconverters
Process Control
Direct Digital Synthesis Tutorial Series (1 of 7): Introduction
标准包装: 1
系列: MicroConverter® ADuC7xxx
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 41.78MHz
连通性: I²C,SPI,UART/USART
外围设备: PLA,POR,PWM,PSM,温度传感器,WDT
输入/输出数: 28
程序存储器容量: 126KB(63K x 16)
程序存储器类型: 闪存
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 10x12b; D/A 1x10b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 64-LQFP
包装: 标准包装
配用: EVAL-ADUC7128QSPZ-ND - KIT DEV FOR ADUC7128
其它名称: ADUC7128BSTZ126-RLDKR
ADuC7128/ADuC7129
Rev. 0 | Page 38 of 92
BAND GAP REFERENCE
The ADuC7128/ADuC7129 provide an on-chip band gap
reference of 2.5 V that can be used for the ADC and for the
DAC. This internal reference also appears on the VREF pin.
When using the internal reference, a capacitor of 0.47 μF must
be connected from the external VREF pin to AGND to ensure
stability and fast response during ADC conversions. This
reference can also be connected to an external pin (VREF)
and used as a reference for other circuits in the system.
An external buffer is required because of the low drive capability
of the VREF output. A programmable option also allows an external
reference input on the VREF pin. Note that it is not possible to
disable the internal reference. Therefore, the external reference
source must be capable of overdriving the internal reference source.
The band gap reference interface consists of an 8-bit REFCON
MMR, described in Table 40.
Table 40. REFCON MMR Bit Designations
Bit
Description
7:1
Reserved.
0
Internal Reference Output Enable.
Set by user to connect the internal 2.5 V reference to the VREF pin. The reference can be used for external components but needs
to be buffered.
Cleared by user to disconnect the reference from the VREF pin.
Note: The on-chip DAC is functional only with the internal reference output enable bit set. It does not work with an external
reference.
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