MCP3918 Datasheet, PDF (15/88 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.
100
80
60
40
GAIN = 1x
20
GAIN = 2x
GAIN = 4x
GAIN = 8x
0
GAIN = 16x
GAIN = 32x
-20
0.001 0.01 0.1
1
10 100 1000
Input Signal Amplitude (mV_PK)
FIGURE 2-25:
SNR vs. Input Signal
Amplitude.
0
GAIN = 1x
-20
GAIN = 2x
GAIN = 4x
-40
GAIN = 8x
GAIN = 16x
GAIN = 32x
-60
-80
-100
-120
-50 -25
FIGURE 2-28:
0 25 50 75 100 125
Temperature (°C)
THD vs. Temperature.
140
120
100
80
60
GAIN = 1x
GAIN = 2x
40
GAIN = 4x
GAIN = 8x
20
GAIN = 16x
GAIN = 32x
0
0.001 0.01 0.1
1
10 100 1000
Input Signal Amplitude (mV_PK)
FIGURE 2-26:
SFDR vs. Input Signal
Amplitude.
100
90
80
70
60
50
40
GAIN = 1x
GAIN = 2x
30
GAIN = 4x
20
GAIN = 8x
10
GAIN = 16x
GAIN = 32x
0
-50 -25 0 25 50 75
Temperature (°C)
100 125
FIGURE 2-29:
SINAD vs. Temperature.
120
100
80
60
OSR = 32
OSR = 64
OSR = 128
OSR = 256
OSR = 512
OSR = 1024
OSR = 2048
OSR = 4096
40
20
0
10
100
1000
10000
Signal Frequency (Hz)
100000
FIGURE 2-27:
SINAD vs. Input Frequency.
100
90
80
70
60
50
40
30
20
10
0
-50
GAIN = 1x
GAIN = 2x
GAIN = 4x
GAIN = 8x
GAIN = 16x
GAIN = 32x
-25 0
FIGURE 2-30:
25 50 75 100 125
Temperature (°C)
SNR vs. Temperature.
 2014 Microchip Technology Inc.
DS20005287A-page 15