参数资料
型号: AD7709BRUZ-REEL7
厂商: Analog Devices Inc
文件页数: 21/32页
文件大小: 0K
描述: IC ADC 16BIT SIGMA-DELTA 24TSSOP
标准包装: 1,000
位数: 16
采样率(每秒): 105
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 3.75mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 24-TSSOP
包装: 带卷 (TR)
输入数目和类型: 2 个差分,单极;2 个差分,双极;4 个伪差分,单极;4 个伪差分,双极
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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