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AD7942BRMZ
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P25
Data Sheet
AD7942
Rev. C | Page 9 of 2
4
TYPICAL PERFORMANCE CHARACTE
RISTICS
POSITIVE IN
L = +0.2
2LSB
NEG
A
TI
VE
INL = –0.
34LS
B
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 Nonlineari
ty vs. Code
129,941
150,000
100,000
50,000
0
COUNT
S
0
0
915
216
0
0
1FF
D
1FF
E
1FF
F
2000
2001
2002
2003
CODE I
N HEX
VDD =
V
REF
= 2.5V
04657-
006
Figure 6. Hist
ogram of a
DC Input at the Cod
e Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
AMPL
IT
UDE (d
B o
f F
ul
l S
cale)
0
25
50
75
100
125
FREQUENC
Y (kHz)
16,384 P
OI
NT
FF
T
VDD
= V
REF
= 5V
f
S
= 250kSP
S
f
IN
= 20.
43kHz
SNR = 85.
1d
B
THD =
–105dB
SF
DR = –105.9d
B
04657-0
07
Figure 7. FFT Plot
POSI
TIV
E DN
L = +0.24LSB
NEG
A
T
I
VE DNL =
–0.12L
SB
1.00
0.75
0.50
0.25
0
–0.50
–0.75
–1.00
–0.25
DNL (L
SB)
0
4096
8192
12,28
8
16,
384
CODE
04657-
008
Figure 8. Differential Non
linearity vs. Code
150,000
100,000
50,000
0
COUNT
S
000
0
0
0
1FF
D
1FF
E
1FFF
2000
2001
2002
2003
CODE I
N HEX
VDD = V
REF
= 5V
131,072
04657-009
Figure 9. Hist
ogram of a
DC Input at the Cod
e Center
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
AMPL
IT
UDE (d
B o
f F
ul
l S
cale)
0
25
50
75
100
125
FREQ
UENC
Y (kHz)
16,384 P
OI
NT
FF
T
VDD
= V
REF
= 2.
5V
f
S
= 250kSP
S
f
IN
= 20.
43kHz
SNR = 84.
2d
B
THD =
–101.7d
B
SF
DR = –104.3d
B
04657-0
10
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
REFE
RENCE VO
LT
AGE (
V)
15.0
14.5
14.0
13.5
13.0
ENOB
(Bit
s)
86
85
84
83
82
SNR, S
INAD (d
B)
04657-0
1
1
Figure 11. SNR, SINAD, and ENO
B vs. Reference Voltage
90
85
80
75
70
SINAD (
dB)
0
50
100
150
200
FREQ
UENC
Y (kHz)
V
REF
= 2.
5V
,
–1dB
V
REF
= 5
V
, –1dB
V
REF
= 5
V
, –10
dB
04657-
012
Figure 12. SINAD vs. Frequency
SNR (d
B)
75
80
85
90
95
–55
–35
–15
5
25
45
65
85
105
125
TEM
PERATURE
(°
C)
04657-013
V
REF
= 5V
V
REF
= 2.
5V
Figure 13. SNR vs. Temper
ature
–
80
–85
–90
–95
–100
–105
–1
10
–1
15
0
40
80
120
160
200
FREQ
UENC
Y (kHz)
THD (d
B)
V
REF
= 2.
5V
,
–1dB
V
REF
= 5V
, –1d
B
04657-0
14
Figure 14. THD vs. Frequency
THD (d
B)
–120
–110
–100
–
90
–55
–35
–15
5
25
45
65
85
105
125
TEM
PERATURE
(°
C)
04657-015
V
REF
= 5V
V
REF
= 2.5V
Figure 15. THD vs. Temper
ature
VDD
VIO
f
S
= 100kSP
S
1000
750
500
250
0
OPER
A
TI
NG CURRENT
S (
μ
A)
2.3
2.7
3.1
3.5
3
.9
4.3
4.
7
5.
1
5
.5
SUPPL
Y (V)
04657-
016
Figure 16. Operating Curre
nts vs. Supply
Data Sheet
AD7942
Rev. C | Page 11 of 24
VDD + VI
O
1000
750
500
250
0
POW
ER-
DOWN CURRE
NTS (
nA)
–55
–35
–15
5
25
45
65
85
1
05
125
TEMPERATU
RE (°C)
04657-
017
Figure 17. Power-D
own Currents vs. Tempe
rature
VIO
VDD =
5V
VDD = 2.
5V
f
S
= 100kSP
S
1000
900
800
700
600
500
400
300
200
100
0
OPE
RATI
NG CURRENT
S (µ
A)
–55
–35
–15
5
25
45
65
85
105
1
25
TEM
PERAT
URE (°
C)
04657-018
Figure 18. Operatin
g Currents vs. Temperature
6
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
OF
FS
ET AND GAI
N ERROR (L
SB)
–55
–35
–15
5
25
45
65
85
105
125
TEM
PERAT
URE (°
C)
OF
FSE
T ERRO
R
GA
IN E
RR
OR
04657-019
Figure 19. Offset Error and
Gain Error v
s. Temperature
04657-0
20
SDO CAP
ACIT
IVE
LO
AD (pF
)
120
0
2
04
06
08
0
1
0
0
t
DSDO
DELAY
(n
s)
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-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P25
AD7942BRMZ
Mfr. #:
Buy AD7942BRMZ
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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