TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C, VCC = +5V, fSAMPLE = 500kHz, fCLK = 16 • fSAMPLE, and internal +2.5V reference, unless otherwise specified.
CHANGE IN FULL-SCALE ERROR
vs EXTERNAL REFERENCE VOLTAGE
CHANGE IN OFFSET
vs EXTERNAL REFERENCE VOLTAGE
0.5
0.4
0.2
0.0
0.3
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
2.0
2.1
2.2
2.3
2.4
2.5
1.9
2.1
2.3
2.5
2.7
2.9
3.1
External Reference Voltage (V)
External Reference Voltage (V)
POWER SUPPLY REJECTION
PEAK-TO-PEAK NOISE
vs POWER SUPPLY RIPPLE FREQUENCY
vs EXTERNAL REFERENCE VOLTAGE
30
25
20
15
10
5
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0
1
10
100
1k
10k
100k
1M
2.0
2.1
2.2
2.3
2.4
2.5
Power Supply Ripple Frequency (Hz)
External Reference Voltage (LSB)
FREQUENCY SPECTRUM
FREQUENCY SPECTRUM
(4096 Point FFT; fIN = 10.9kHz, –0.2dB)
(4096 Point FFT; fIN = 102kHz, –0.2dB)
0
–20
0
–20
–40
–40
–60
–60
–80
–80
–100
–120
–100
–120
0
62.5
125
187.5
250
0
62.5
125
187.5
250
Frequency (kHz)
Frequency (kHz)
®
5
ADS7818
BB [ BURR-BROWN CORPORATION ]
