AD7770_17 Datasheet, PDF (20/98 Pages) Analog Devices – 8-Channel, 24-Bit, Simultaneous Sampling ADC

Data Sheet
20
TEMPERATURE = 25°C
GAIN = 1
15 _{DIFFERENTIAL INPUT SIGNAL}
V_CM = (AVDD1x + AVSSx) ÷ 2
10
5
0
–5
V_REF = 1V
–10
V_REF = 1.5V
V_REF = 2V
–15
V_REF = 2.5V
V_REF = 3V
V_REF = 3.3V
–20
–4
–3
–2
–1
0
1
2
3
4
INPUT VOLTAGE (V)
Figure 14. INL vs. Input Voltage and Reference Voltage (VREF)
at 16 kSPS, High Resolution Mode
10
TEMPERATURE = 25°C
8 ^VREF ^{= 2.5V}
DIFFERENTIAL INPUT SIGNAL
6 ^{GAIN = 1}
4
2
0
–2
–4
–6
–8
–10
V_CM = 1.35V
V_CM = 1.65V
V_CM = 1.95V
INPUT VOLTAGE (V)
Figure 15. INL vs. Input Voltage and VCM at 16 kSPS, High Resolution Mode
1400
1200
1000
V_REF = 2.5V
V_CM = (AVDD1x + AVSSx) ÷ 2
TEMPERATURE = 25°C
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
800
600
400
200
0
ADC CODE
Figure 16. Noise Histogram at 16 kSPS, High Resolution Mode
AD7770
20
TEMPERATURE = 25°C
GAIN = 1
15 _{DIFFERENTIAL INPUT SIGNAL}
V_CM = (AVDD1x + AVSSx) ÷ 2
10
5
0
–5
V_REF = 1V
–10
V_REF = 1.5V
V_REF = 2V
–15
V_REF = 2.5V
V_REF = 3V
V_REF = 3.3V
–20
–4
–3
–2
–1
0
1
2
3
4
INPUT VOLTAGE (V)
Figure 17. INL vs. Input Voltage and VREF at 4 kSPS, Low Power Mode
15
TEMPERATURE = 25°C
V_REF = 2.5V
10
DIFFERENTIAL INPUT SIGNAL
GAIN =1
5
0
–5
–10
V_CM = 1.35V
V_CM = 1.65V
V_CM = 1.95V
–15
INPUT VOLTAGE (V)
Figure 18. INL vs. Input Voltage and VCM at 4 kSPS, Low Power Mode
1400
1200
1000
V_REF = 2.5V
V_CM = (AVDD1x + AVSSx) ÷ 2
TEMPERATURE = 25°C
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
800
600
400
200
0
ADC CODE
Figure 19. Noise Histogram at 4 kSPS, Low Power Mode
Rev. C | Page 19 of 97