AD7796 Analog Devices, AD7796 Datasheet - Page 9

• Manufacturer Part Number: AD7796
• Description: Low Power 16-Bit Sigma-Delta A/D Converter for Bridge Sensors
• Manufacturer: Analog Devices

Specifications of AD7796

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: ± (Vref/128)
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

RMS NOISE AND RESOLUTION SPECIFICATIONS
Table 6 shows the rms noise of the AD7796/AD7797 for some
of the update rates. The numbers given are for the bipolar input
range with an external 2.5 V reference. These numbers are
typical and are generated with a differential input voltage of 0 V.
Table 7 and Table 8 show the effective resolution, while the
output peak-to-peak (p-p) resolution is shown in brackets. It is
important to note that the effective resolution is calculated
using the rms noise, while the p-p resolution is based on the p-p
noise. The p-p resolution represents the resolution for which
there is no code flicker. These numbers are typical and are
rounded to the nearest 0.5 LSB.
Rev. A | Page 9 of 24
Table 6. RMS Noise (μV) vs. Output Update Rate for the
AD7796/AD7797 Using a 2.5 V Reference
Update Rate (Hz)
4.17
6.25
8.33
10
12.5
16.7
33.2
50
62
123
Table 7. Typical Resolution (Bits) vs. Output Update Rate for
the AD7797 Using a 2.5 V Reference
Update Rate (Hz)
4.17
6.25
8.33
10
12.5
16.7
33.2
50
62
123
Table 8. Typical Resolution (Bits) vs. Output Update Rate for
the AD7796 Using a 2.5 V Reference
Update Rate (Hz)
4.17
6.25
8.33
10
12.5
16.7
33.2
50
62
123
Effective Bits (p-p)
19 (16.5)
19 (16.5)
19 (16)
18.5 (16)
18.5 (16)
18.5 (15.5)
18 (15)
17.5 (15)
17.5 (14.5)
16.5 (13.5)
RMS Noise (μV)
0.065
0.07
0.08
0.09
0.1
0.12
0.17
0.21
0.23
0.43
Effective Bits (p-p)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (15.5)
16 (15)
16 (15)
16 (14.5)
16 (13.5)
AD7796/AD7797