MCP3918 Datasheet, PDF (16/88 Pages) Microchip Technology – 3V Single-Channel Analog Front End

MCP3918
Note: Unless otherwise indicated, AV_DD = 3V, DV_DD = 3V; T_A = +25°C, MCLK = 4 MHz; PRESCALE = 1;
OSR = 256; GAIN = 1; Dithering = Maximum; V_IN = -0.5 dBFS @ 60 Hz on all channels, VREFEXT = 0; CLKEXT = 1;
BOOST<1:0> = 10.
120
100
80
60
40
20
0
-50
GAIN = 1x
GAIN = 2x
GAIN = 4x
GAIN = 8x
GAIN = 16x
GAIN = 32x
-25 0 25 50 75
Temperature (°C)
100 125
FIGURE 2-31:
SFDR vs. Temperature.
1.2
1.199
1.198
1.197
-40 -20 0
FIGURE 2-34:
vs. Temperature.
20 40 60 80 100 120 140
Temperature (°C)
Internal Voltage Reference
1000
800
600
400
200
0
-200
-400
-600
-800
-1000
-40 -20 0
FIGURE 2-32:
Gain.
GAIN = 1x
GAIN = 2x
GAIN = 4x
GAIN = 8x
GAIN = 16x
GAIN = 32x
20 40 60 80 100 120
Temperature (°C)
Offset vs. Temperature vs.
1.1969
1.1968
1.1967
1.1966
1.1965
1.1964
1.1963
1.1962
1.1961
2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6
AV_DD (V)
FIGURE 2-35:
Internal Voltage Reference
vs. Supply Voltage.
9
7
5
3
1
-1
-3
-5
-40 -20 0
FIGURE 2-33:
vs. Gain.
GAIN = 1x
GAIN = 2x
GAIN = 4x
GAIN = 8x
GAIN = 16x
GAIN = 32x
20 40 60 80 100 120
Temperature (°C)
Gain Error vs. Temperature
10
8
6
4
2
0
-2
-4
-6
-8
-10
-0.6 -0.4 -0.2 0.0 0.2 0.4 0.6
Input Voltage (V)
FIGURE 2-36:
Integral Non-Linearity
(Dithering Maximum).
DS20005287A-page 16
 2014 Microchip Technology Inc.