AD7706 Analog Devices, AD7706 Datasheet - Page 14

• Manufacturer Part Number: AD7706
• Description: 3V/5V, 1mW, 3-Channel Pseudo Differential, 16-Bit Sigma-Delta ADC
• Manufacturer: Analog Devices

Specifications of AD7706

• Resolution (bits): 16bit
• # Chan: 3
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip (Vref)/(PGA Gain),Uni (Vref)/(PGA Gain)
• Adc Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC,SOP

AD7705/AD7706
TYPICAL PERFORMANCE CHARACTERISTICS
32771
32770
32769
32768
32767
32766
32765
32764
32763
1.2
1.0
0.8
0.6
0.4
0.2
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
Figure 5. Noise @ Gain = +128 With 50 Hz Update Rate
0.4
0
1
BUFFERED MODE
f
CLKDIV = 1
UNBUFFERED MODE
f
CLKDIV = 0
V
EXTERNAL MCLK
CLKDIS = 1
T
V
V
GAIN = +128
50Hz UPDATE RATE
CLK
CLK
Figure 7. I
DD
A
DD
REF
V
T
0.6
100
= 25°C
DD
A
Figure 6. I
= 5MHz,
= 1MHz,
= 3V
= 5V
UNBUFFERED MODE, GAIN = +1
= 25°C
= 2.5V
2
= 3V
BUFFERED MODE, GAIN = +1
0.8
200
DD
1.0
vs. Gain and Clock Frequency @ 3 V
300
DD
4
vs. MCLK IN Frequency @ 3 V
BUFFERED MODE, GAIN = +128
1.2
READING NUMBER
FREQUENCY (MHz)
400
UNBUFFERED MODE, GAIN = +128
8
1.4
T
RMS NOISE = 600nV
A
GAIN
500
= 25°C
BUFFERED MODE
f
CLK
1.6
UNBUFFERED MODE
f
CLK
16
BUFFERED MODE
f
600
UNBUFFERED MODE
f
= 2.4576MHz, CLKDIV = 0
CLK
CLK
= 2.84MHz, CLKDIV = 0
1.8
= 1MHz, CLKDIV = 0
= 5MHz, CLKDIV = 1
700
32
2.0
800
2.2
64
900 1000
2.4
128
2.6
Rev. C | Page 14 of 44
400
300
200
100
1.2
1.0
0.8
0.6
0.4
0.2
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0
0.4
1
UNBUFFERED MODE
f
CLKDIV = 0
BUFFERED MODE
f
CLKDIV = 1
CLK
32764
BUFFERED MODE, GAIN = +1
Figure 10. I
CLK
V
EXTERNAL MCLK
CLKDIS = 1
T
A
DD
V
T
0.6
UNBUFFERED MODE, GAIN = +1
DD
A
= 1MHz,
= 25°C
Figure 9. I
= 5MHz,
= 5V
Figure 8. Histogram of Data in Figure 5
= +25°C
2
= 5V
0.8
32765
BUFFERED MODE, GAIN = +128
DD
1.0
vs. Gain and Clock Frequency @ 5 V
DD
4
32766
vs. MCLK IN Frequency @ 5 V
1.2
FREQUENCY (MHz)
UNBUFFERED MODE, GAIN = +128
8
1.4
32767
CODE
GAIN
UNBUFFERED MODE
f
CLK
BUFFERED MODE
f
CLK
1.6
= 2.4576MHz, CLKDIV = 0
16
BUFFERED MODE
f
= 2.4576MHz, CLKDIV = 0
UNBUFFERED MODE
f
CLK
CLK
32768
1.8
= 1MHz, CLKDIV = 0
= 5MHz, CLKDIV = 1
32
2.0
32769
2.2
64
32770
2.4
128
2.6