Datasheet

Data Sheet AD7329
Rev. B | Page 13 of 40
8k
0
–3
CODE
NUMBER OF OCCURRENCES
7k
6k
5k
4k
3k
2k
1k
–2 –1
0
1 2 3
V
CC
= 5V
V
DD
= 12V, V
SS
= –12V
RANGE = ±10V
10k SAMPLES
T
A
= 25°C
0 23
1201
7600
1165
1
1 0
05402-016
Figure 16. Histogram of Codes, Single-Ended Mode
–50
–100
0
RIPPLE FREQUENCY (kHz)
CMRR (dB)
–55
–60
–65
–70
–75
–80
–85
–90
–95
200 400 600 800 1000 1200
DIFFERENTIAL MODE
f
IN
= 50kHz
V
DD
= 12V, V
SS
= –12V
f
S
= 1MSPS
T
A
= 25°C
V
CC
= 5V
V
CC
= 3V
05402-017
Figure 17. CMRR vs. Common-Mode Ripple Frequency
2.0
–2.0
SUPPLY VOLTAGE (V) (V
DD
= +, V
SS
= –)
DNL ERROR (LSB)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
±5
±7 ±9 ±11 ±13 ±15 ±17 ±19
±5V RANGE
V
CC
= V
DRIVE
= 5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
AD8021 BETWEEN MUX
OUT
+
AND ADC
IN
+ PINS
DNL = 500kSPS
DNL = 500kSPS
DNL = 1MSPS
DNL = 1MSPS
05402-018
Figure 18. DNL Error vs. Supply Voltage at 500 kSPS and 1 MSPS
2.0
–2.0
SUPP
LY
VOLT
AGE (V) (V
DD
= +, V
SS
= –)
INL ERROR (LSB)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
±5
±7
±9 ±
1
1 ±13
±15
±17 ±19
±5V RANGE
V
CC
= V
DRIVE
= 5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
AD8021 BETWEEN MUX
OUT
+
AND ADC
IN
+ PINS
INL = 1MSPS
INL = 1MSPS
INL = 500kSPS
INL = 500kSPS
05402-019
Figure 19. INL Error vs. Supply Voltage at 500 kSPS and 1 MSPS
–50
–100
0
1200
SUPPLY RIPPLE FREQUENCY (kHz)
PSRR (dB)
–55
–60
–65
–70
–75
–80
–85
–90
–95
200 400 600 800 1000
100mV p-p SINE WAVE ON EACH SUPPLY
NO DECOUPLING
SINGLE-ENDED MODE
f
S
= 1MSPS
V
CC
= 5V
V
CC
= 3V
V
DD
= 12V
V
SS
= –12V
05402-020
Figure 20. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–50
–100
10
1000
05402-021
ANALOG INPUT FREQUENCY (kHz)
THD (dB)
DIFFERENTIAL MODE
V
DD
= 12V, V
SS
= –12V
V
CC
= V
DRIVE
= 5V
INTERNAL REFERENCE
AD8021 BETWEEN MUX
OUT
AND ADC
IN
PINS
100
–55
–60
–65
–70
–75
–80
–85
–90
–95
R
IN
= 2000Ω
R
IN
= 1000Ω
R
IN
= 600
Ω
R
IN
= 100Ω
R
IN
= 50Ω
±10V RANGE
R
IN
= 4000Ω
R
IN
= 1000Ω
R
IN
= 600Ω
R
IN
= 100Ω
R
IN
= 50
Ω
±2.5V RANGE
Figure 21. THD vs. Analog Input Frequency for Various Source Impedances,
True Differential Mode