參數(shù)資料
型號: AD7934BRU-REEL
廠商: Analog Devices Inc
文件頁數(shù): 2/32頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 4CH 1.5MSPS 28TSSOP
標(biāo)準包裝: 2,500
位數(shù): 12
采樣率(每秒): 1.5M
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 13.5mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 28-TSSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 4 個單端,單極;2 個差分,單極;2 個偽差分,單極
AD7933/AD7934
Rev. B | Page 10 of 32
Pin No.
Mnemonic
Description
20
WR
Write Input. Active low logic input used in conjunction with CS to write data to the control register.
21
RD
Read Input. Active low logic input used in conjunction with CS to access the conversion result. The conversion
result is placed on the data bus following the falling edge of RD read while CS is low.
22
CS
Chip Select. Active low logic input used in conjunction with RD and WR to read conversion data or write data to
the control register.
23
AGND
Analog Ground. This is the ground reference point for all analog circuitry on the AD7933/AD7934. All analog input
signals and any external reference signal should be referred to this AGND voltage. The AGND and DGND voltages
should ideally be at the same potential and must not be more than 0.3 V apart, even on a transient basis.
24
VREFIN/VREFOUT
Reference Input/Output. This pin is connected to the internal reference and is the reference source for the ADC.
The nominal internal reference voltage is 2.5 V, and this appears at this pin. It is recommended to decouple the
VREFIN/VREFOUT pin to AGND with a 470 nF capacitor. This pin can be overdriven by an external reference. The input
voltage range for the external reference is 0.1 V to VDD; however, ensure that the analog input range does not
exceed VDD + 0.3 V. See the Reference section.
25 to
28
VIN0 to VIN3
Analog Input 0 to Analog Input 3. Four analog input channels that are multiplexed into the on-chip track-and-
hold. The analog inputs can be programmed as four single-ended inputs, two fully differential pairs, or two pseudo
differential pairs by appropriately setting the MODE bits in the control register (see Table 10). Select the analog
input channel to be converted either by writing to Address Bit ADD1 and Address Bit ADD0 in the control register
prior to the conversion, or by using the on-chip sequencer. The input range for all input channels can either be 0 V
to VREF or 0 V to 2 × VREF, and the coding can be binary or twos complement, depending on the states of the RANGE
and CODING bits in the control register. To avoid noise pickup, connect any unused input channels to AGND.
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