AD7985 Analog Devices, AD7985 Datasheet - Page 10

• Manufacturer Part Number: AD7985
• Description: 16-Bit, 2.5 MSPS PulSAR 11 mW ADC in QFN
• Manufacturer: Analog Devices

Specifications of AD7985

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 2.5MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: (Vref) p-p,Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: CSP

AD7985
100
95
90
85
80
–100
–120
–140
–160
–180
2.50
95
90
85
80
75
70
65
–20
–40
–60
–80
0
1
0
Figure 12. SNR, SINAD, and ENOB vs. Reference Voltage
2.75
3.00
Figure 11. FFT Plot (External Reference)
250
Figure 13. SINAD vs. Frequency
3.25
REFERENCE VOLTAGE (V)
10
3.50
FREQUENCY (kHz)
FREQUENCY (kHz)
500
3.75
ENOB
4.00
750
4.25
100
SNR
f
f
SNR = 89.87dB
THD = –102.76dB
SINAD = 89.66dB
S
IN
4.50
= 2.5MSPS
= 20kHz
1000
SINAD
4.75
5.00
1000
16
15
14
13
12
1250
Rev. A | Page 10 of 28
–100
–105
–110
–90
–95
–100
–105
–110
–85
–90
–95
–100
–120
–140
–160
–180
2.50
–20
–40
–60
–80
0
1
0
2.75
Figure 15. THD and SFDR vs. Reference Voltage
3.00
Figure 14. FFT Plot (Internal Reference)
250
Figure 16. THD vs. Frequency
3.25
REFERENCE VOLTAGE (V)
10
3.50
FREQUENCY (kHz)
500
FREQUENCY (kHz)
SFDR
3.75
THD
750
4.00
4.25
100
1000
f
f
SNR = 88.45dB
THD = –103.42dB
SINAD = 88.32dB
4.50
S
IN
= 2.5MSPS
= 20kHz
4.75
1250
5.00
1000
100
95
90
85
80