Datasheet

AD7760
Rev. A | Page 15 of 36
0
–160
995 1005
04975-024
FREQUENCY (kHz)
AMPLITUDE (dB)
–20
–40
–60
–80
–100
–120
–140
997 999 1001 1003
TONE A: 999.75kHz
TONE B: 1.00025MHz
THIRD-ORDER
IMD: –89.15dB
Figure 23. Normal Mode IMD, 1 MHz Center Frequency, 8× Decimation
100.5
96.5
04
0
04975-025
MCLK FREQUENCY (MHz)
SNR (dBFS)
100.0
99.5
99.0
98.5
98.0
97.5
97.0
10 20 30
LOW POWER MODE
NORMAL MODE
Figure 24. SNR vs. MCLK Frequency, 8× Decimation, −6 dB, 1 kHz Input Tone
120
95
0 256
04975-026
DECIMATION RATE
SNR (dBFS)
115
110
105
100
64 128 192
–0.5dB
–6dB
–60dB
Figure 25. Normal Mode SNR vs. Decimation Rate, 1 kHz Input Tone
0
–160
995 1005
04975-027
FREQUENCY (kHz)
AMPLITUDE (dB)
–20
–40
–60
–80
–100
–120
–140
997 999 1001 1003
TONE A: 999.75kHz
TONE B: 1.00025MHz
THIRD-ORDER
IMD: –87.67dB
Figure 26. Normal Mode IMD, 1 MHz Center Frequency, 8× Decimation
–
105
–117
040
04975-028
MCLK FREQUENCY (MHz)
THD (dBc)
–107
–109
–111
–113
–115
10 20 30
NORMAL MODE
LOW POWER MODE
Figure 27. THD vs. MCLK Frequency, 8× Decimation, −6 dB, 1 kHz Input Tone
116
96
0 256
04975-029
DECIMATION RATE
SNR (dBFS)
112
108
104
100
64 128 192
–0.5dB
–6dB
–60dB
Figure 28. Low Power SNR vs. Decimation Rate, 1 kHz Input Tone