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AD7942BCPZRL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
Data Sheet AD7942
Rev. C | Page 9 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
POSITIVE INL = +0.22LSB
NEGATIVE INL = –0.34LSB
1.00
0.75
0.50
0.25
0
–0.50
–0.75
–1.00
–0.25
INL (LSB)
0 4096 8192 12,288 16,384
CODE
04657-005
Figure 5. Integral Nonlinearity vs. Code
129,941
150,000
100,000
50,000
0
COUNTS
0 0 915 216 0 0
1FFD 1FFE
1FFF
2000 2001 2002 2003
CODE IN HEX
VDD = V
REF
= 2.5V
04657-006
Figure 6. Histogram of a DC Input at the Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
AMPLITUDE (dB of Full Scale)
0 25 50 75 100 125
FREQUENCY (kHz)
16,384 POINT FFT
VDD = V
REF
= 5V
f
S
= 250kSPS
f
IN
= 20.43kHz
SNR = 85.1dB
THD = –105dB
SFDR = –105.9dB
04657-007
Figure 7. FFT Plot
POSITIVE DNL = +0.24LSB
NEGATIVE DNL = –0.12LSB
1.00
0.75
0.50
0.25
0
–0.50
–0.75
–1.00
–0.25
DNL (LSB)
0 4096 8192 12,288 16,384
CODE
04657-008
Figure 8. Differential Nonlinearity vs. Code
150,000
100,000
50,000
0
COUNTS
000 0 00
1FFD 1FFE
1FFF
2000 2001 2002 2003
CODE IN HEX
VDD = V
REF
= 5V
131,072
04657-009
Figure 9. Histogram of a DC Input at the Code Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
AMPLITUDE (dB of Full Scale)
0 25 50 75 100 125
FREQUENCY (kHz)
16,384 POINT FFT
VDD = V
REF
= 2.5V
f
S
= 250kSPS
f
IN
= 20.43kHz
SNR = 84.2dB
THD = –101.7dB
SFDR = –104.3dB
04657-010
Figure 10. FFT Plot
AD7942 Data Sheet
Rev. C | Page 10 of 24
SNR
SINAD
ENOB
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
REFERENCE VOLTAGE (V)
15.0
14.5
14.0
13.5
13.0
ENOB (Bits)
86
85
84
83
82
SNR, SINAD (dB)
04657-011
Figure 11. SNR, SINAD, and ENOB vs. Reference Voltage
90
85
80
75
70
SINAD (dB)
0 50 100 150 200
FREQUENCY (kHz)
V
REF
= 2.5V, –1dB
V
REF
= 5V, –1dB
V
REF
= 5V, –10dB
04657-012
Figure 12. SINAD vs. Frequency
SNR (dB)
75
80
85
90
95
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
04657-013
V
REF
= 5V
V
REF
= 2.5V
Figure 13. SNR vs. Temperature
–
80
–85
–90
–95
–100
–105
–110
–115
0 40 80 120 160 200
FREQUENCY (kHz)
THD (dB)
V
REF
= 2.5V, –1dB
V
REF
= 5V, –1dB
04657-014
Figure 14. THD vs. Frequency
THD (dB)
–120
–110
–100
–
90
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
04657-015
V
REF
= 5V
V
REF
= 2.5V
Figure 15. THD vs. Temperature
VDD
VIO
f
S
= 100kSPS
1000
750
500
250
0
OPER
A
TING CURRENTS (μA)
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY (V)
04657-016
Figure 16. Operating Currents vs. Supply
Data Sheet AD7942
Rev. C | Page 11 of 24
VDD + VIO
1000
750
500
250
0
POWER-DOWN CURRENTS (nA)
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
04657-017
Figure 17. Power-Down Currents vs. Temperature
VIO
VDD = 5V
VDD = 2.5V
f
S
= 100kSPS
1000
900
800
700
600
500
400
300
200
100
0
OPERATING CURRENTS (µA)
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
04657-018
Figure 18. Operating Currents vs. Temperature
6
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
OFFSET AND GAIN ERROR (LSB)
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
OFFSET ERROR
GAIN ERROR
04657-019
Figure 19. Offset Error and Gain Error vs. Temperature
04657-020
SDO CAPACITIVE LOAD (pF)
1200 20406080100
t
DSDO
DELAY (ns)
25
20
15
10
5
0
VDD = 2.5V, 85°C
VDD = 3.3V, 25°C
VDD = 3.3V, 85°C
VDD = 5V, 85°C
VDD = 5V, 25°C
VDD = 2.5V, 25°C
Figure 20. t
DSDO
Delay vs. SDO Capacitance
Load and Supply
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

AD7942BCPZRL7

Mfr. #:
Buy AD7942BCPZRL7
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 14-Bit 250KSPS PSEUDO DIFF IC
Lifecycle:
New from this manufacturer.
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