AD7767 Analog Devices, AD7767 Datasheet - Page 11

• Manufacturer Part Number: AD7767
• Description: 24-Bit, 15 mW, 109 dB, 128 kSPS/64 kSPS/32 kSPS ADCs
• Manufacturer: Analog Devices

Specifications of AD7767

• Resolution (bits): 24bit
• # Chan: 1
• Sample Rate: 128kSPS
• Interface: Ser
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: SOP

–100
–120
–140
–160
–180
–100
–120
–140
–160
–180
–100
–120
–140
–160
–180
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
0
0
Figure 14. AD7767-1 FFT, 1 kHz, −60 dB Input Tone
Figure 15. AD7767-2 FFT, 1 kHz, −60 dB Input Tone
Figure 13. AD7767 FFT, 1 kHz, −60 dB Input Tone
8k
4k
16k
8k
4k
24k
12k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
32k
16k
8k
40k
20k
48k
24k
12k
56k
28k
64k
32k
16k
Rev. C | Page 11 of 24
–100
–120
–140
–160
–180
–100
–120
–140
–160
–180
–100
–120
–140
–160
–180
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
Figure 17. AD7767-1 IMD FFT, 25 kHz Center Frequency
Figure 18. AD7767-2 IMD FFT, 12 kHz Center Frequency
0
0
0
Figure 16. AD7767 IMD FFT, 50 kHz Center Frequency
TONE A = 11.7kHz
TONE B = 12.3kHz
SECOND-ORDER IMD = –137.96dB
THIRD-ORDER IMD = –108.1dB
TONE A = 49.7kHz
TONE B = 50.3kHz
SECOND-ORDER IMD = –133.71dB
THIRD-ORDER IMD = –109.05dB
TONE A = 24.7kHz
TONE B = 25.3kHz
SECOND-ORDER IMD = –133.33dB
THIRD-ORDER IMD = –108.15dB
8k
4k
16k
8k
4k
24k
12k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
32k
16k
8k
40k
20k
48k
24k
12k
56k
28k
AD7767
64k
32k
1
6k