Datasheet
MAX1403
+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
26 ______________________________________________________________________________________
Table 15. Modulator Operating Frequency, Sampling Frequency, and 16-Bit Data Output
Rates
Table 16a. Noise vs. Gain and Output Data Rate—Unbuffered Mode, V
REF
= 1.25V,
f
CLKIN
= 2.4576MHz
Note: Default condition is in bold print.
2.048
2.048
0
0
2.048 01.024
2.048 0
4.9152
12.4576
1.024
1.024
4.9152 1
CLKIN FREQUENCY,
f
CLKIN
(MHz)
CLK
16 8
32 16 40, 50
2.4576
64
1.024
32
128 64
38.4
80, 100
20, 25
19.2 50, 60
76.8
AIN/REFIN
SAMPLING
FREQUENCY,
f
S
(kHz)
MODULATOR
FREQUENCY,
f
M
(kHz)
AVAILABLE
OUTPUT
DATA RATES
AT 16-BIT
ACCURACY
(sps)
38.4 100, 120
160, 200
4.9152 12.4576
4.9152 12.4576
153.6 76.8 200, 240
307.2 153.6 400, 480
0
1
0
1
0
0
MF1
1
1
0
1
1
0
0
1
MF0
0
1
X2CLK = 0
DEFAULT
X2CLK = 1
-3dB
FREQ.
(Hz)
TYPICAL OUTPUT NOISE (µV
RMS
)
FOR VARIOUS PROGRAMMABLE GAINS
60 15.7 5.91 3.20 1.90 1.25
OUTPUT
DATA
RATE
(sps)
1.13 1.18 1.15 1.15 FS1:FS0 = 1
300 78.6 80.5 38.6 20.6 10.3 5.73 3.62 2.84 2.67 FS1:FS0 = 2
600 157.2
x1 x2 x4 x8 x16 x32 x64 x128 MF1:MF0 = 0
50 13.1 5.42 3.03 1.70 1.11 1.06 1.05 1.05 1.04 FS1:FS0 = 0
441 236 112 54.8 29.2 14.5 7.61 5.13 FS1:FS0 = 3
MF1:MF0 = 1
100 26.2 5.53 2.96 1.73 1.13 1.06 1.06 1.08 1.05 FS1:FS0 = 0
120 31.4 6.06 3.28 1.90 1.25 1.17 1.11 1.12 1.11 FS1:FS0 = 1
600 157.2 81.5 39.9 19.6 10.2 5.45 3.49 2.72 2.59 FS1:FS0 = 2
1200 314.4 450 232 115 53.4 27.8 14.7 8.00 5.08 FS1:FS0 = 3
MF1:MF0 = 2
200 52.4 5.39 2.92 1.70 1.09 1.06 1.02 1.02 1.03 FS1:FS0 = 0
240 62.9 6.27 3.28 1.89 1.20 1.18 1.14 1.17 1.11 FS1:FS0 = 1
1200 314.4 77.8 40.1 20.1 10.0 5.53 3.56 2.74
BIT
STATUS
2.59 FS1:FS0 = 2
2400 628.8 431 232 109 54.9 28.2 14.1 8.08 4.99 FS1:FS0 = 3
MF1:MF0 = 3
400 104.8 5.36 3.00 1.82 1.17 1.10 1.06 1.10 1.11 FS1:FS0 = 0
480 125.7 5.88 3.25 1.94 1.28 1.26 1.16 1.17 1.15 FS1:FS0 = 1
2400 628.8 79.7 39.6 20.2 10.5 5.74 3.63 3.02 2.76 FS1:FS0 = 2
4800 1258 441 227 111 55.5 29.7 14.6 7.73 5.43 FS1:FS0 = 3