EVAL-AD7920CB Analog Devices Inc, EVAL-AD7920CB Datasheet - Page 10

• Manufacturer Part Number: EVAL-AD7920CB
• Description: BOARD EVAL FOR AD7920
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7920CB

• Rohs Status: RoHS non-compliant
• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 250k
• Data Interface: Serial
• Inputs Per Adc: 1 Single Ended
• Input Range: 0 ~ Vdd
• Power (typ) @ Conditions: 12.5mW @ 250kSPS, 5 V
• Voltage Supply Source: Single
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7920
• Lead Free Status / RoHS Status: Not Compliant

AD7910/AD7920
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 7 and Figure 8 show a typical FFT plot for the AD7920 and
AD7910, respectively, at a 250 kSPS sampling rate and a 100 kHz
input frequency.
Figure 9 shows the signal-to-(noise + distortion) ratio performance
vs. input frequency for various supply voltages while sampling at
250 kSPS with an SCLK frequency of 5 MHz for the AD7920.
Figure 10 and Figure 11 show typical INL and DNL performance
for the AD7920.
–105
–115
–25
–45
–65
–85
–15
–35
–55
–75
–95
15
–5
–5
0
0
Figure 7. AD7920 Dynamic Performance at 250 kSPS
Figure 8. AD7910 Dynamic Performance at 250 kSPS
8192 POINT FFT
V
f
f
SINAD = 61.67dB
THD = –79.59dB
SFDR = –82.93dB
8192 POINT FFT
V
f
f
SINAD = 72.05dB
THD = –82.87dB
SFDR = –87.24dB
SAMPLE
IN
SAMPLE
IN
DD
DD
= 100kHz
= 100kHz
= 2.35V
= 2.7V
= 250kSPS
= 250kSPS
25
25
FREQUENCY (kHz)
FREQUENCY (kHz)
50
50
75
75
100
100
125
125
Rev. C | Page 10 of 24
Figure 12 shows a graph of the total harmonic distortion vs. analog
input frequency for different source impedances when using a
supply voltage of 3.6 V and sampling at a rate of 250 kSPS. See the
Analog Input section.
Figure 13 shows a graph of the total harmonic distortion vs.
analog input signal frequency for various supply voltages while
sampling at 250 kSPS with an SCLK frequency of 5 MHz.
–71.0
–71.5
–72.0
–72.5
–73.0
–73.5
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
0
Figure 9. AD7920 SINAD vs. Input Frequency at 250 kSPS
10
0
V
V
TEMP = 25°C
f
V
SAMPLE
DD
DD
DD
= 4.75V V
512
= 2.35V
= 5.25V
V
DD
Figure 10. AD7920 INL Performance
= 250kSPS
= 2.35V
1024
DD
= 3.6V
1536
FREQUENCY (kHz)
CODE
2048
100
2560
V
DD
= 2.7V
3072
3584
1000
4096