AD7942 Analog Devices, AD7942 Datasheet - Page 9

• Manufacturer Part Number: AD7942
• Manufacturer: Analog Devices

Specifications of AD7942

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (Vref) p-p,Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

TYPICAL PERFORMANCE CHARACTERISTICS
150,000
100,000
50,000
–0.25
–0.50
–0.75
–1.00
–100
–120
–140
–160
–180
1.00
0.75
0.50
0.25
–20
–40
–60
–80
0
0
0
0
0
Figure 6. Histogram of a DC Input at the Code Center
1FFD
0
Figure 5. Integral Nonlinearity vs. Code
25
1FFE
4096
0
Figure 7. FFT Plot
1FFF
915
FREQUENCY (kHz)
50
CODE IN HEX
CODE
129,941
8192
2000
POSITIVE INL = +0.22LSB
NEGATIVE INL = –0.34LSB
75
2001
216
VDD = V
16,384 POINT FFT
VDD = V
f
f
SNR = 85.1dB
THD = –105dB
SFDR = –105.9dB
S
IN
12,288
= 250kSPS
= 20.43kHz
2002
100
0
REF
REF
= 2.5V
= 5V
2003
0
16,384
125
Rev. B | Page 9 of 24
150,000
100,000
50,000
–0.25
–0.50
–0.75
–1.00
–100
–120
–140
–160
–180
1.00
0.75
0.50
0.25
–20
–40
–60
–80
0
0
0
0
Figure 9. Histogram of a DC Input at the Code Center
0
1FFD
0
Figure 8. Differential Nonlinearity vs. Code
25
1FFE
4096
0
Figure 10. FFT Plot
1FFF
FREQUENCY (kHz)
0
50
CODE IN HEX
131,072
CODE
8192
2000
POSITIVE DNL = +0.24LSB
NEGATIVE DNL = –0.12LSB
75
2001
0
16,384 POINT FFT
VDD = V
f
f
SNR = 84.2dB
THD = –101.7dB
SFDR = –104.3dB
VDD = V
S
IN
12,288
= 250kSPS
= 20.43kHz
2002
100
0
REF
REF
AD7942
= 2.5V
= 5V
2003
0
16,384
125