参数资料
型号: AD7321BRUZ-REEL7
厂商: Analog Devices Inc
文件页数: 21/37页
文件大小: 0K
描述: IC ADC 12BIT+ SAR 2CHAN 14TSSOP
标准包装: 1,000
位数: 12
采样率(每秒): 500k
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 17mW
电压电源: 双 ±
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 14-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 14-TSSOP
包装: 带卷 (TR)
输入数目和类型: 2 个单端,单极;2 个单端,双极;1 个差分,单极;1 个差分,双极
配用: EVAL-AD7321CBZ-ND - BOARD EVALUATION FOR AD7321
Data Sheet
AD7321
Rev. B | Page 27 of 36
REFERENCE
The AD7321 can operate with either the internal 2.5 V on-chip
reference or an externally applied reference. The internal reference
is selected by setting the Ref bit in the control register to 1. On
power-up, the Ref bit is 0, which selects the external reference
for the AD7321 conversion. Suitable reference sources for the
The internal reference circuitry consists of a 2.5 V band gap
reference and a reference buffer. When operating the AD7321
in internal reference mode, the 2.5 V internal reference is available
at the REFIN/OUT pin, which should be decoupled to AGND
using a 680 nF capacitor. It is recommended that the internal
reference be buffered before applying it elsewhere in the system.
The internal reference is capable of sourcing up to 90 μA.
On power-up, if the internal reference operation is required for
the ADC conversion, a write to the control register is necessary
to set the Ref bit to 1. During the control register write, the
conversion result from the first initial conversion is invalid. The
reference buffer requires 500 s to power up and charge the
680 nF decoupling capacitor during the power-up time.
The AD7321 is specified for a 2.5 V to 3 V reference range.
When a 3 V reference is selected, the ranges are ±12 V, ±6 V,
±3 V, and 0 V to +12 V. For these ranges, the VDD and VSS supply
must be equal to or greater than the maximum analog input
range selected (see Table 6).
VDRIVE
The AD7321 has a VDRIVE feature to control the voltage at which
the serial interface operates. VDRIVE allows the ADC to easily
interface to both 3 V and 5 V processors. For example, if the
AD7321 is operated with a VCC of 5 V, the VDRIVE pin can be
powered from a 3 V supply. This allows the AD7321 to accept
large bipolar input signals with low voltage digital processing.
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