AD7765 Analog Devices, AD7765 Datasheet - Page 11

• Manufacturer Part Number: AD7765
• Description: 24-Bit, 156 kSPS, 112 dB Sigma-Delta ADC with On-Chip Buffers and Serial Interface
• Manufacturer: Analog Devices

Specifications of AD7765

• Resolution (bits): 24bit
• # Chan: 1
• Sample Rate: 40MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: 6.5 V p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

TYPICAL PERFORMANCE CHARACTERISTICS
AV
to 16-bit accuracy; input signal reduced to avoid modulator overload and digital clipping; fast Fourier transforms (FFTs) generated from
8,192 samples.
DD
1 = DV
–100
–125
–150
–175
–100
–125
–150
–175
–100
–125
–150
–175
Figure 6. Normal Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,
Figure 7. Normal Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,
–25
–50
–75
–25
–50
–75
–25
–50
–75
Figure 8. Normal Power Mode; FFT, 1 kHz, −6 dB Input Tone,
0
0
0
0
0
0
DD
= 2.5 V, AV
10k
128× Decimation Rate
256× Decimation Rate
128× Decimation Rate
25k
25k
DD
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
2 = AV
20k
DD
3 = AV
50k
50k
30k
DD
4 = 5 V, V
75k
75k
REF
+ = 4.096 V, MCLK amplitude = 5 V, T
Rev. A | Page 11 of 32
–100
–125
–150
–175
–115
–135
–155
–175
–100
–125
–150
–175
–25
–50
–75
–15
–35
–55
–75
–95
–25
–50
–75
Figure 10. Low Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,
Figure 9. Low Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,
Figure 11. Low Power Mode; FFT, 1 kHz, −6 dB Input Tone,
0
0
0
0
0
10k
5k
20k
10k
128× Decimation Rate
256× Decimation Rate
128× Decimation Rate
25k
A
= 25°C. Linearity plots measured
30k
15k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
40k
20k
50k
25k
50k
60k
30k
70k
35k
AD7765
75k