Datasheet

55
60
65
70
75
80
85
90
95
32 64 128 256 512 1024
SINAD – dB
SD24OSRx
MSP430F673x
MSP430F672x
SLAS731C –DECEMBER 2011–REVISED FEBRUARY 2013 www.ti.com
SD24_B, AC Performance
f
SD24
= 32 kHz, SD24OSRx = 512, SD24REFS = 1
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
SD24GAIN: 1 3 V 89
SD24GAIN: 2 3 V 85
SD24GAIN: 4 3 V 84
SD24GAIN: 8 3 V 86
Signal-to-noise +
SINAD f
IN
= 12Hz
(1)
dB
distortion ratio
SD24GAIN: 16 3 V 80
SD24GAIN: 32 3 V 76
SD24GAIN: 64 3 V 67
SD24GAIN: 128 3 V 61
(1) The following voltages were applied to the SD24_B inputs:
V
I,A+
(t) = 0 V + V
PP
/2 × sin(2π × fIN × t)
V
I,A-
(t) = 0 V - V
PP
/2 × sin(2π × f
IN
× t)
resulting in a differential voltage of V
ID
= V
I,A+
(t) - V
I,A-
(t) = V
PP
× sin(2π × f
IN
× t) with V
PP
being selected as the maximum value allowed
for a given range (according to SD24_B recommended operating conditions).
Figure 19. SINAD vs OSR
(f
SD24
= 1 MHz, SD24REFS = 1, SD24GAIN = 1)
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