MSP430F673x
MSP430F672x
SLAS731A –DECEMBER 2011–REVISED APRIL 2012
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MAX UNIT
dB
SD24_B, AC Performance
fSD24 = 32 kHz, SD24OSRx = 512, SD24REFS = 1
PARAMETER
SD24GAIN: 1
SD24GAIN: 2
SD24GAIN: 4
TEST CONDITIONS
VCC
3 V
3 V
3 V
3 V
3 V
3 V
3 V
3 V
MIN
TYP
89
85
84
86
80
76
67
61
SD24GAIN: 8
SD24GAIN: 16
SD24GAIN: 32
SD24GAIN: 64
SD24GAIN: 128
Signal-to-noise +
distortion ratio
SINAD
fIN = 12Hz(1)
(1) The following voltages were applied to the SD24_B inputs:
VI,A+(t) = 0 V + VPP/2 × sin(2π × fIN × t)
VI,A-(t) = 0 V - VPP/2 × sin(2π × fIN × t)
resulting in a differential voltage of VID = VI,A+(t) - VI,A-(t) = VPP × sin(2π × fIN × t) with VPP being selected as the maximum value allowed
for a given range (according to SD24_B recommended operating conditions).
95
90
85
80
75
70
65
60
55
32
64
128
256
512
1024
SD24OSRx
Figure 19. SINAD vs OSR
(fSD24 = 1 MHz, SD24REFS = 1, SD24GAIN = 1)
76
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