Datasheet

4–2
4.3.2 ADC Path Filter, Fs = 8 kHz (see Note 2)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
0 Hz to 300 Hz –0.5 0.2
300 Hz to 3 kHz –0.5 0.25
Filter gain relative to gain at 1020 Hz
3.3 kHz –0.5 0.3
dB
Filter gain relative to gain at 1020 Hz
3.6 kHz –3
dB
4 kHz –35
≥ 4.4 kHz –74
NOTE 2: The filter gain outside of the passband is measured with respect to the gain at 1024 Hz. The analog input test signal is a sine wave with
0 dB = 4 V
I(PP)
as the reference level for the analog input signal. The pass band is 0 to 3600 Hz for an 8-kHz sample rate. This pass
band scales linearly with the sample rate.
4.3.3 ADC Dynamic Performance, Fs = 8 kHz
4.3.3.1 ADC Signal-to-Noise (see Note 3)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
I
= –1 dB 78 84
SNR
Signal to noise ratio
V
I
= –3 dB 76 81
dB
SNR Signal-to-noise ratio
V
I
= –9 dB
72 78
dB
V
I
= –40 dB 37 42
NOTE 3: The test condition is a 1020-Hz input signal with an 8-kHz conversion rate. Input and output common mode is 2.5 V for 5-V supply, and
1.5-V for 3.3-V supply.
4.3.3.2 ADC Signal-to-Distortion (see Note 3)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
I
= –1 dB 76 80
THD
Signal to total harmonic distortion
V
I
= –3 dB 76 80
dB
THD Signal-to-total harmonic distortion
V
I
= –9 dB
80 85
dB
V
I
= –40 dB 64 72
NOTE 3: The test condition is a 1020-Hz input signal with an 8-kHz conversion rate. Input and output common mode is 2.5 V for 5-V supply, and
1.5-V for 3.3-V supply.
4.3.3.3 ADC Signal-to-Distortion + Noise (see Note 3)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
I
= –1 dB 76 80
THD+N
Signal to total harmonic distortion + noise
V
I
= –3 dB 74 79
dB
THD+N Signal-to-total harmonic distortion + noise
V
I
= –9 dB
72 78
dB
V
I
= –40 dB 38 43
NOTE 3: The test condition is a 1020-Hz input signal with an 8-kHz conversion rate. Input and output common mode is 2.5 V for 5-V supply, and
1.5 V for 3.3-V supply.