AD7949 Analog Devices, AD7949 Datasheet - Page 9

• 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
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 2.5 V to 5.5 V, V
–0.5
–1.0
–100
–120
–140
–160
1.0
0.5
–20
–40
–60
–80
300k
250k
200k
150k
100k
0
50k
0
0
Figure 5. Integral Nonlinearity vs. Code, V
0
0
Figure 6. Histogram of a DC Input at Code Center
1FFC
0
Figure 7. 20 kHz FFT, V
1FFD
4,096
25
0
1FFE
REF
0
FREQUENCY (kHz)
= 2.5 V to 5 V, VIO = 2.3 V to VDD, unless otherwise noted..
50
CODES
1FFF
CODE IN HEX
8,192
1
V
f
f
SNR = 85.3dB
SINAD = 85.2dB
THD = –100dB
SFDR = 103dB
SECOND HARMONIC = –110dB
THIRD HARMONIC = –103dB
S
IN
REF
= 250kSPS
= 19.9kHz
261,120
REF
2000
= VDD = 5V
0
= VDD = 5 V
75
2001
12,288
REF
0
V
= VDD = 5 V
REF
100
2002
= VDD = 5V
0
16,384
2003
0
125
Rev. C | Page 9 of 32
–0.5
–1.0
1.0
0.5
300k
250k
200k
150k
100k
–100
–120
–140
–160
–180
50k
–20
–40
–60
–80
0
Figure 8. Differential Nonlinearity vs. Code, V
0
0
0
0
1FFC 1FFD 1FFE 1FFF 2000
Figure 9. Histogram of a DC Input at Code Center
0
Figure 10. 20 kHz FFT, V
0
4,096
25
0
FREQUENCY (kHz)
955
CODE IN HEX
CODES
8,192
259,473
V
f
f
SNR = 84.2dB
SINAD = 82.4dB
THD = –84dB
SFDR = 85dB
SECOND HARMONIC = –100dB
THIRD HARMONIC = –85dB
50
s
IN
REF
= 200kSPS
REF
= 19.9kHz
= VDD = 2.5V
= VDD = 2.5 V
2001
693
12,288
V
2002
REF
0
REF
75
= VDD = 5 V
= VDD = 2.5V
2003
0
AD7949
2004
16,384
0
100