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