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AD7705BRU Datasheet(PDF) 9 Page - Analog Devices

No. de pieza AD7705BRU
Descripción Electrónicos  3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7705BRU Datasheet(HTML) 9 Page - Analog Devices

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AD7705/AD7706
–9–
REV. A
Typical Performance Characteristics–
READING NO.
32763
0
100
32764
32765
32766
32767
32768
32769
32770
32771
200
300
400
500
600
700
800
900 1000
VDD = 5V
VREF = 2.5V
GAIN = 128
50Hz UPDATE RATE
TA = +25 C
RMS NOISE = 600nV
Figure 2. Typical Noise Plot @ Gain = 128 with 50 Hz
Update Rate
FREQUENCY – MHz
0.4
VDD = 3V
TA = +25 C
1.2
1.0
0.8
0.6
0.4
0.2
0
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
BUFFERED MODE, GAIN = 128
UNBUFFERED MODE, GAIN = 1
UNBUFFERED MODE, GAIN = 128
BUFFERED MODE, GAIN = 1
Figure 3. Typical IDD vs. MCLKIN Frequency @ 3 V
GAIN
1
VDD = 3V
EXTERNAL MCLK
CLKDIS = 1
TA = +25 C
1.0
0.8
0.6
0.4
0.2
0
0.1
0.3
0.5
0.7
0.9
2
4
8
16
32
64
128
BUFFERED MODE
fCLK = 5MHz,
CLKDIV = 1
BUFFERED MODE
fCLK = 1MHz, CLKDIV = 0
BUFFERED MODE
fCLK = 2.4576MHz, CLKDIV = 0
UNBUFFERED MODE
fCLK = 2.84MHz, CLKDIV = 0
UNBUFFERED MODE
fCLK = 1MHz,
CLKDIV = 0
UNBUFFERED MODE
fCLK = 5MHz, CLKDIV = 1
Figure 4. Typical IDD vs. Gain and Clock Frequency @ 3 V
CODE
32764
400
0
32765
32766
32767
32768
32769
32770
300
200
100
Figure 5. Histogram of Data in Figure 2
FREQUENCY – MHz
0.4
VDD = 5V
TA = +25 C
1.2
1.0
0.8
0.6
0.4
0.2
0
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
BUFFERED MODE, GAIN = 128
UNBUFFERED MODE, GAIN = 1
UNBUFFERED MODE, GAIN = 128
BUFFERED MODE, GAIN = 1
Figure 6. Typical IDD vs. MCLKIN Frequency @ 5 V
GAIN
1
VDD = 5V
EXTERNAL MCLK
CLKDIS = 1
TA = +25 C
1.2
0.8
0.6
0.4
0.2
0
1.0
24
8
16
32
64
128
BUFFERED MODE
fCLK = 5MHz,
CLKDIV = 1
BUFFERED MODE
fCLK = 1MHz, CLKDIV = 0
BUFFERED MODE
fCLK = 2.4576MHz, CLKDIV = 0
UNBUFFERED MODE
fCLK = 2.4576MHz, CLKDIV = 0
UNBUFFERED MODE
fCLK = 1MHz,
CLKDIV = 0
UNBUFFERED MODE
fCLK = 5MHz, CLKDIV = 1
Figure 7. Typical IDD vs. Gain and Clock Frequency @ 5 V


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