Typical operating characteristics – Rainbow Electronics MX7705 User Manual
Page 11
MX7705
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
______________________________________________________________________________________
11
Table 4. Peak-to-Peak Resolution vs. Gain and Output Data Rate (V
DD
= 3V)
TYPICAL PEAK-TO-PEAK RESOLUTION (BITS)
GAIN
FILTER FIRST
NOTCH AND
OUTPUT DATA RATE
-3dB FREQUENCY
1
2
4
8
16
32
64
128
BUFFERED (f
CLKIN
= 1MHz)
20Hz
5.24Hz
16
16
16
16
15
14
13
12
25Hz
6.55Hz
16
16
16
16
15
14
13
12
100Hz
26.2Hz
12
12
12
12
12
12
12
11
200Hz
52.4Hz
10
10
10
10
10
10
10
9
UNBUFFERED (f
CLKIN
= 1MHz)
20Hz
5.24Hz
16
16
16
16
15
14
13
12
25Hz
6.55Hz
16
16
16
16
15
14
13
12
100Hz
26.2Hz
12
12
12
12
12
14
12
11
200Hz
52.4Hz
10
10
10
10
10
10
10
9
BUFFERED (f
CLKIN
= 2.4576MHz)
50Hz
13.1Hz
16
16
16
16
15
14
13
12
60Hz
15.72Hz
16
16
16
16
15
14
13
12
250Hz
65.5Hz
12
12
12
12
12
12
11
11
500Hz
131Hz
10
11
10
10
10
10
10
9
UNBUFFERED (f
CLKIN
= 2.4576MHz)
50Hz
13.1Hz
16
16
16
16
15
14
13
12
60Hz
15.72Hz
16
16
16
16
15
14
13
12
250Hz
65.5Hz
12
12
12
12
12
12
11
11
500Hz
131Hz
10
10
10
10
10
10
10
9
TYPICAL OUTPUT NOISE
MX7705 toc01
READING NUMBER
CODE READ
1600
1200
800
400
32758
32760
32762
32764
32766
32768
32770
32772
32774
32776
32756
0
2000
V
DD
= 5V,
V
REF
= 2.5V
GAIN = 128
ODR = 60Hz
RMS NOISE = 1.3
µV
HISTOGRAM OF TYPICAL OUTPUT NOISE
MX7705 toc02
CODE
OCCURENCE
32773
32772
32771
32770
32769
32768
32767
32766
32765
32764
32763
32762
32761
100
200
300
400
0
32760
V
DD
= 5V, V
REF
= 2.5V
GAIN = 128
ODR = 60Hz
RMS NOISE = 1.3
µV
OFFSET ERROR vs. SUPPLY VOLTAGE (3V)
MX7705 toc03
SUPPLY VOLTAGE (V)
OFFSET ERROR (%FSR)
3.45
3.30
3.15
3.00
2.85
-0.0010
-0.0005
0
0.0005
0.0010
0.0015
-0.0015
2.70
3.60
V
DD
= 3V
Typical Operating Characteristics
(V
DD
= 3V or 5V, V
REF+
= 1.225V for V
DD
= 3V, V
REF+
= 2.5V for V
DD
= 5V, V
REF
- = GND, T
A
= +25°C, unless otherwise noted.)