Datasheet

10Maxim Integrated
MAX11321–MAX11328
1Msps, 10-/12-Bit, 4-/8-/16-Channel ADCs with
Post-Mux External Signal Conditioning Access
Typical Operating Characteristics (continued)
(MAX11322ATJ+/MAX11325ATJ+/MAX11328ATJ+, T
A
= +25°C, unless otherwise noted.)
SNR vs. INPUT RESISTANCE
MAX11321 toc09
R
IN
(I)
SNR (dB)
4500
4000
3500
3000
2500
2000
1500
1000
500
71.5
72.0
72.5
f
SAMPLE
= 1Msps
f
IN
= 100kHz
BUFFER BETWEEN AOP AND AIP
BUFFER BETWEEN AON AND AIN
AOP SHORTED TO AIP
AON SHORTED TO AIN
73.0
71.0
0 5000
SFDR vs. INPUT RESISTANCE
MAX11321 toc12
SFDR (dB)
80
85
90
75
R
IN
(I)
4500
4000
3500
3000
2500
2000
1500
1000
500
0 5000
f
SAMPLE
= 1Msps
f
IN
= 100kHz
BUFFER BETWEEN AOP AND AIP
BUFFER BETWEEN AON AND AIN
AOP SHORTED TO AIP
AON SHORTED TO AIN
SUPPLY CURRENT vs. TEMPERATURE
MAX11321 toc15
TEMPERATURE (°C)
I
VDD
(mA)
1109580655035205-10-25
1.5
2.0
2.5
f
SAMPLE
= 1Msps
V
DD
= 3.0V
3.0
1.0
-40 125
SNR vs. REFERENCE VOLTAGE
MAX11321 toc16
V
REFP
(V)
SNR (dB)
3.43.02.62.21.81.4
69
70
71
72
73
74
68
1.0
f
SAMPLE
= 1Msps
f
IN
= 100kHz
SINAD vs. INPUT RESISTANCE
MAX11321 toc10
SINAD (dB)
71
72
73
70
R
IN
(I)
4500
4000
3500
3000
2500
2000
1500
1000
500
0 5000
f
SAMPLE
= 1Msps
f
IN
= 100kHz
BUFFER BETWEEN AOP AND AIP
BUFFER BETWEEN AON AND AIN
AOP SHORTED TO AIP
AON SHORTED TO AIN
100kHz SINE-WAVE INPUT
(8192 POINT FFT PLOT)
MAX11321 toc13
FREQUENCY (kHz)
AMPLITUDE (dB)
45040035030025020015010050
-100
-80
-60
-40
-20
0
-120
0 500
A
HD2
= -102.99dB
f = 200kHz
AHD3 = -86.69dB
f = 300kHz
f
SAMPLE
= 1Msps
f
IN
= 100kHz
THD vs. INPUT RESISTANCE
MAX11321 toc11
R
IN
(I)
THD (dB)
4500
4000
3500
3000
2500
2000
1500
1000
500
-85
-80
-75
f
SAMPLE
= 1Msps
f
IN
= 100kHz
BUFFER BETWEEN AOP AND AIP
BUFFER BETWEEN AON AND AIN
-70
-90
0 5000
AOP SHORTED TO AIP
AON SHORTED TO AIN
REFERENCE CURRENT
vs. SAMPLING RATE
MAX11321 toc14
f
SAMPLE
(ksps)
I
REF
(µA)
500
10
20
30
40
50
0
0 1000