參數(shù)資料
型號: AD7322BRUZ-REEL7
廠商: Analog Devices Inc
文件頁數(shù): 20/37頁
文件大小: 0K
描述: IC ADC 12BIT+ SAR 2CHAN 14TSSOP
標(biāo)準(zhǔn)包裝: 1,000
位數(shù): 12
采樣率(每秒): 1M
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 30mW
電壓電源: 雙 ±
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 14-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 14-TSSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 2 個單端,單極;2 個單端,雙極;1 個差分,單極;1 個差分,雙極
配用: EVAL-AD7322CBZ-ND - BOARD EVALUATION FOR AD7322
AD7322
Data Sheet
Rev. B | Page 26 of 36
REFERENCE
The AD7322 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, resulting in the selection of the external
reference for the AD7322 conversion. Suitable reference sources
The internal reference circuitry consists of a 2.5 V band gap
reference and a reference buffer. When operating the AD7322 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 AD7322 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 AD7322 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
AD7322 is operated with a VCC of 5 V, the VDRIVE pin can be
powered from a 3 V supply. This allows the AD7322 to accept
large bipolar input signals with low voltage digital processing.
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