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AD7687 Datasheet

  • AD7687

  • 3mW, 100kSPS, 14-Bit ADC in 6-Lead SOT-23

  • 30頁

  • AD

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AD7940
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5 shows a typical FFT plot for the AD7940 at 100 kSPS
sample rate and 10 kHz input frequency. Figure 6 shows the
signal-to-(noise + distortion) ratio performance versus the
input frequency for various supply voltages while sampling at
100 kSPS with an SCLK of 2.5 MHz.
Figure 7 shows a graph of the total harmonic distortion versus
the analog input frequency for various supply voltages, while
Figure 8 shows a graph of the total harmonic distortion versus
the analog input frequency for various source impedances (see
the Analog Input section). Figure 9 and Figure 10 show the
typical INL and DNL plots for the AD7940.
0
鈥?0
鈥?0
鈥?0
V
DD
= 4.75V
F
SAMPLE
= 100kSPS
F
IN
= 10kHz
SNR = 84.48dB
SINAD = 84.35dB
THD = 鈥?8.97dB
SFDR = 鈥?00.84dB
110
F
SAMPLE
= 100kSPS
T
A
= 25
擄
C
105
V
DD
= 3V
100
V
DD
= 3.6V
V
DD
= 2.7V
V
DD
= 4.3V
鈥?0
鈥?00
THD (dB)
(dB)
95
90
鈥?20
03305-0-019
V
DD
= 5.25V
V
DD
= 4.75V
V
DD
= 2.5V
03305-0-021
85
鈥?40
鈥?60
0
10k
20k
30k
40k
FREQUENCY (kHz)
50k
80
10
INPUT FREQUENCY (kHz)
100
Figure 5. AD7940 Dynamic Performance at 100 kSPS
90
F
SAMPLE
= 100kSPS
T
A
= 25
擄
C
110
105
100
95
Figure 7. AD7940 THD vs. Analog Input Frequency
for Various Supply Voltages at 100 kSPS
F
SAMPLE
= 100kSPS
T
A
= 25
擄
C
V
DD
= 4.75V
V
DD
= 5.25V
85
V
DD
= 4.75V
R
IN
= 10鈩?/div>
R
IN
= 50鈩?/div>
SINAD (dB)
THD (dB)
V
DD
= 4.3V
V
DD
= 3.6V
80
V
DD
= 2.5V
V
DD
= 3V
V
DD
= 2.7V
03305-0-020
90
R
IN
= 100鈩?/div>
85
80
75
70
10
INPUT FREQUENCY (kHz)
R
IN
= 1000鈩?/div>
03305-0-022
75
10
INPUT FREQUENCY (kHz)
100
100
Figure 6. AD7940 SINAD vs. Analog Input Frequency
for Various Supply Voltages at 100 kSPS
Figure 8. AD7940 THD vs. Analog Input Frequency
for Various Source Impedances
Rev. 0 | Page 9 of 20

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