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INA849 Datasheet(PDF) 27 Page - Texas Instruments

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Part # INA849
Description  PGA855 Low-Noise, Wide-Bandwidth, Fully Differential Output Programmable-Gain Instrumentation Amplifier
PDF  42 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA849 Datasheet(HTML) 27 Page - Texas Instruments

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9.2.1.2 Detailed Design Procedure
Table 9-2 and Table 9-3 show the typical signal-to-noise (SNR) and total harmonic distortion (THD) of the
PGA855 driving the ADS127Lx1 delta-sigma ADC using a sinc4 or wideband filter. Figure 9-7 and Figure 9-8
show the respective FFT plots. For the SNR and THD measurements, a 1
‑kHz differential signal is applied. The
signal amplitude is adjusted to produce a PGA855 output at –0.2 dBFS of the ADC full-scale range. For a list of
the equivalent input voltage amplitude signals for the different PGA855 gain configurations, see Table 9-2 and
Table 9-3. At gain = 1 V/V, the design achieves –121.4
‑dB THD and 109.1‑dB SNR.
Table 9-2. PGA855 and ADS127Lx1 FFT Data Summary, OSR = 64, Sinc4 Filter
PGA GAIN (V/V)
INPUT AMPLITUDE (VPP)
SNR (dB)
THD (dB)
ENOB (Bits)
0.125
40.0
106.0
–119.6
17.5
0.25
32.022
109.0
–119.3
17.8
0.5
16.012
109.8
–121.2
17.9
1
8.006
109.6
–121.4
17.9
2
4.002
109.6
–121.4
17.9
4
2.002
107.4
–121.4
17.5
8
1.0
104.0
–121.4
17.0
16
0.5
99.1
–117.0
16.2
Table 9-3. PGA855 and ADS127Lx1 FFT Data Summary, OSR = 64, Wideband Filter
PGA GAIN (V/V)
INPUT AMPLITUDE (VPP)
SNR (dB)
THD (dB)
ENOB (Bits)
0.125
40.0
106.0
–119.6
17.3
0.25
32.022
107.5
–119.0
17.5
0.5
16.012
107.7
–121.2
17.6
1
8.006
107.6
–121.4
17.6
2
4.002
107.0
–121.4
17.5
4
2.002
105.4
–121.4
17.2
8
1.0
101.7
–121.4
16.6
16
0.5
96.7
–117.0
15.8
www.ti.com
PGA855
SBOSAE0B – APRIL 2023 – REVISED SEPTEMBER 2023
Copyright © 2023 Texas Instruments Incorporated
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Product Folder Links: PGA855



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