ADS7950 Datasheet, PDF (16/43 Pages) Texas Instruments – 12/10/8-Bit, 1 MSPS, 16/12/8/4-Channel, Single-Ended, MicroPower, Serial Interface ADCs

ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
SLAS605 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
TYPICAL CHARACTERISTICS (12-Bit Devices Only) (continued)
Variations for 10-bit and 8-bit devices are too small to be illustrated through the characteristic curves
OFFSET ERROR VARIATION ACROSS
CHANNELS
1.6
+VA = 5 V,
1.4 ^{+VBD = 5 V,}
f_S = 1 MSPS
1.2
1
0.8
0.6
0.4
0.2
0
0
5
10
15
20
Channel Number
Figure 34.
SIGNAL-TO-NOISE + DISTORTION
VARIATION ACROSS CHANNELS
73
+VA = 5 V,
+VBD = 5 V,
72.5 f_S = 1 MSPS
72
71.5
GAIN ERROR VARIATION ACROSS
CHANNELS
0.25
+VA = 5 V,
+VBD = 5 V,
f_S = 1 MSPS
0.2
0.15
0.1
0.05
0
0
5
10
15
20
Channel Number
Figure 35.
CROSSTALK
vs
INPUT FREQUENCY
120
Isolation
100
80
Memory
60
71
70.5
70
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Channel Number
Figure 37.
40
+VA = 5 V,
+VBD = 5 V,
20
f_S = 1 MSPS,
CH0, CH1
0
0
50
100 150 200 250
f_IN - Input Frequency - KHz
Figure 38.
SIGNAL-TO-NOISE RATIO VARIATION
ACROSS CHANNELS
73
72.5
72
71.5
71
+VA = 5 V,
70.5
+VBD = 5 V,
f_S = 1 MSPS
70
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Channel Number
Figure 36.
INPUT LEAKAGE CURRENT
vs
FREE-AIR TEMPERATURE
100
90 ^{+VA = 5 V,}
+VBD = 5 V
80
70
60
50
V_I = 0 V
40
V_I = 1.25 V
30
20
V_I = 2.5 V
10
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
T_A - Free-Air Temperature - °C
Figure 39.
16
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ADS7959, ADS7960, ADS7961