ADS7229 Datasheet, PDF (15/46 Pages) Texas Instruments – LOW-POWER, 12-BIT, 1MHz, SINGLE/DUAL UNIPOLAR INPUT, ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE

ADS7229
ADS7230
www.ti.com........................................................................................................................................................................................................ SBAS437 – MAY 2008
TYPICAL CHARACTERISTICS (continued)
At –40°C to +85°C, V_REF [(REF+) – (REF–)] = 5V when +VA = +VBD = 5V or V_REF [(REF+) – (REF–)] = 2.5V when +VA =
+VBD = 3V, f_SCLK = 42MHz, or V_REF = 2.5 when +VA = +VBD = 2.7V, f_SCLK = 37.8MHz, and f_i = dc for dc curves, f_i = 100kHz
for ac curves with 5V supply and f_i = 10kHz for ac curves with 3V supply, unless otherwise noted.
INTEGRAL NONLINEARITY
vs EXTERNAL CLOCK FREQUENCY
0.50
+VA = 3V
0.25
INL+
0
-0.25
INL-
0.50
0.25
0
-0.25
OFFSET VOLTAGE
vs FREE-AIR TEMPERATURE
5V
3V
-0.50
0.1
1
10
100
f_SCLK (MHz)
Figure 12.
OFFSET VOLTAGE
vs SUPPLY VOLTAGE
0.5
0.4
0.3
0.2
0.1
0
-0.1
2.5
3.0
3.5
4.0
4.5
5.0
5.5
+VA Supply Voltage (V)
Figure 14.
GAIN ERROR
vs SUPPLY VOLTAGE
0.10
0.05
0
-0.05
-0.10
2.5
3.0
3.5
4.0
4.5
5.0
5.5
+VA Supply Voltage (V)
Figure 16.
-0.50
-40
-15
10
35
60
85
Temperature (°C)
Figure 13.
0.050
GAIN ERROR
vs FREE-AIR TEMPERATURE
0.025
3V
0
5V
-0.025
-0.050
-40
-15
10
35
60
85
Temperature (°C)
Figure 15.
POWER-SUPPLY REJECTION RATIO
vs SUPPLY RIPPLE FREQUENCY
-70
5V
-72
3V
-74
-76
-78
-80
0 10 20 30 40 50 60 70 80 90 100
Frequency (kHz)
Figure 17.
Copyright © 2008, Texas Instruments Incorporated
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