Datasheet

ADS7834
5
SBAS098A
www.ti.com
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 9.77kHz, –0.2dB)
Frequency (kHz)
0
–20
–40
–60
–80
–100
–120
Amplitude (dB)
0 50 100 150 200 250
TYPICAL PERFORMANCE CURVES (Cont.)
At T
A
= +25°C, V
CC
= +5V, f
SAMPLE
= 500kHz, f
CLK
= 16 • f
SAMPLE
, and internal +2.5V reference, unless otherwise specified.
FULL-SCALE ERROR
vs EXTERNAL REFERENCE VOLTAGE
External Reference Voltage (V)
0.300
0.200
0.100
0.000
–0.100
–0.200
–0.300
–0.400
–0.500
–0.600
Delta from V
REF
= 2.5V (mV)
2.0 2.1 2.2 2.3 2.4 2.5
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 977Hz, –0.2dB)
Frequency (kHz)
0
–20
–40
–60
–80
–100
–120
Amplitude (dB)
0 50 100 150 200 250
PEAK-TO-PEAK NOISE
vs EXTERNAL REFERENCE VOLTAGE
2.22 2.52.1 2.3
External Reference Voltage (V)
Peak-to-Peak Noise (LSB)
0.90
0.85
0.80
0.75
0/70
0.65
0.60
0.55
0.50
2.4
POWER SUPPLY REJECTION
vs POWER SUPPLY RIPPLE FREQUENCY
11M10 100 1k
Power Supply Ripple Frequency (Hz)
Power Supply Rejection (mV/V)
30
25
20
15
10
5
0
10k 100k
OFFSET VOLTAGE vs EXTERNAL
REFERENCE VOLTAGE
External Reference Voltage (V)
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
Delta from V
REF
= 2.5V (mV)
2.0 2.2 2.4 2.55