AD7949 Analog Devices, AD7949 Datasheet - Page 11

• Manufacturer Part Number: AD7949
• Description: 14-Bit, 8-Channel, 250 kSPS PulSAR ADC
• Manufacturer: Analog Devices

Specifications of AD7949

• Resolution (bits): 14bit
• # Chan: 8
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Adc Architecture: SAR
• Pkg Type: CSP

Data Sheet
–100
–110
–120
–60
–70
–80
–90
–1
–2
2
1
0
–55
90
89
88
87
86
85
84
83
82
81
80
79
78
–10
0
Figure 19. Offset and Gain Errors vs. Temperature
–35
f
IN
UNIPOLAR ZERO
UNIPOLAR GAIN
BIPOLAR ZERO
BIPOLAR GAIN
= 20kHz
–15
–8
Figure 18. SNR vs. Input Level
Figure 17. THD vs. Frequency
50
VDD = V
VDD = V
5
TEMPERATURE (°C)
FREQUENCY (kHz)
INPUT LEVEL (dB)
–6
25
REF
REF
100
= 2.5V
= 5V
VDD = V
VDD = V
VDD = V
VDD = V
45
–4
65
REF
REF
REF
REF
= 5V, –0.5dB
= 2.5V, –0.5dB
= 2.5V, –10dB
= 5V, –10dB
150
85
–2
105
125
200
0
Rev. C | Page 11 of 32
2750
2500
2250
2000
1750
1500
1250
1000
3000
2750
2500
2250
2000
1750
1500
1250
1000
750
2.5
–55
Figure 22. t
25
20
15
10
5
0
0
VDD = 5V, INTERNAL 4.096V REF
f
S
2.5V INTERNAL REF
4.096V INTERNAL REF
INTERNAL BUFFER, TEMP ON
INTERNAL BUFFER, TEMP OFF
EXTERNAL REF, TEMP ON
EXTERNAL REF, TEMP OFF
VIO
–35
= 200kSPS
VDD = 5V, EXTERNAL REF
Figure 21. Operating Currents vs. Temperature
3.0
Figure 20. Operating Currents vs. Supply
DSDO
20
VDD = 2.5, EXTERNAL REF
–15
VDD = 3.3V, 25°C
VDD = 2.5V, 25°C
Delay vs. SDO Capacitance Load and Supply
3.5
SDO CAPACITIVE LOAD (pF)
VDD = 3.3V, 85°C
5
TEMPERATURE (°C)
40
VDD SUPPLY (V)
VDD = 2.5V, 85°C
25
4.0
60
45
4.5
VDD = 5V, 25°C
65
80
f
S
= 200kSPS
VIO
85
VDD = 5V, 85°C
5.0
100
105
AD7949
5.5
125
100
90
80
70
60
50
40
30
20
120
180
160
140
120
100
80
60
40
20