VCC GND REF OUT2 REF IN 10 F 0.1 F V
參數(shù)資料
型號(hào): AD7709BRUZ-REEL7
廠商: Analog Devices Inc
文件頁數(shù): 21/32頁
文件大?。?/td> 0K
描述: IC ADC 16BIT SIGMA-DELTA 24TSSOP
標(biāo)準(zhǔn)包裝: 1,000
位數(shù): 16
采樣率(每秒): 105
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): 3.75mW
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: 24-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 24-TSSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 2 個(gè)差分,單極;2 個(gè)差分,雙極;4 個(gè)偽差分,單極;4 個(gè)偽差分,雙極
REV. A
AD7709
–28–
MICROCONTROLLER
VCC
GND
REF OUT2
REF IN
10 F
0.1 F
VDD
AIN1
AIN2
CS
DOUT
SCLK
DIN
GND
REFIN(+)
REFIN(–)
0.1 F
REF OUT1
CLOCK
LATCH
DATA
4.7 F
COM
C1
C2
C3
AD7709
AD421
BOOST VCC
LV
0.01 F
1k
1000pF
LOOP
POWER
10 F
3.3V
1.25V
DN25D
0.01 F
LOOP
RTN
COMP
DRIVE
VARIABLES
AIN3
AIN4
Figure 23. Smart Transmitter Employing the AD7709
Smart Transmitters
Smart transmitters are another key design-in area for the AD7709.
The
-
converter, single-supply operation, 3-wire interface
capabilities, and small package size are all of benefit in smart
transmitters. Here, the entire smart transmitter must operate
from the 4–20 mA loop. Tolerances in the loop mean that the
amount of current available to power the transmitter is as low as
3.5 mA. Figure 23 shows a block diagram of a smart transmitter
that includes the AD7709.
Not shown in Figure 23 is the isolated power source required to
power the front end.
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