AD7985 Analog Devices, AD7985 Datasheet - Page 9

• 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

TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = DVDD = VIO = 2.5 V, BVDD = 5.0 V, V
Figure 6. Histogram of DC Input at Code Center (External Reference)
Figure 7. Histogram of DC Input at Code Center (Internal Reference)
–0.25
–0.50
–0.75
–1.00
–1.25
60,000
50,000
40,000
30,000
20,000
10,000
60,000
50,000
40,000
30,000
20,000
10,000
1.25
1.00
0.75
0.50
0.25
0
0
0
0
7FFB
7FFC 7FFD 7FFE 7FFF 8000
0
0
7FFC
Figure 5. Integral Nonlinearity vs. Code
11
122
16,384
7FFD
565
6150
7FFE 7FFF 8000 8001 8002 8003 8004 8005
8455
38,843
33,064
CODE IN HEX
CODE IN HEX
32,768
CODE
57,138
49,585
POSITIVE INL = +0.38LSB
NEGATIVE INL = –0.46LSB
31,957
26,249
8001
7024
49,152
8002
2537
403
8003
33
REF
8
= 5.0 V, external reference (PDREF is high, REFIN is low), unless otherwise noted.
8004
65,536
0
0
Rev. A | Page 9 of 28
Figure 10. Histogram of DC Input at Code Transition (Internal Reference)
Figure 9. Histogram of DC Input at Code Transition (External Reference)
–0.25
–0.50
–0.75
–1.00
60,000
50,000
40,000
30,000
20,000
10,000
50,000
45,000
40,000
35,000
30,000
25,000
20,000
15,000
10,000
1.00
0.75
0.50
0.25
5000
0
0
0
0
7FFB
7FFC
0
0
Figure 8. Differential Nonlinearity vs. Code
7FFC
7FFD
90
2
16,384
7FFD
7FFE
2947
479
11,888
7FFE 7FFF 8000 8001 8002 8003 8004
20,474
7FFF 8000 8001 8002 8003 8004 8005
CODE IN HEX
CODE IN HEX
48,730
46,649
32,768
CODE
POSITIVE DNL = +0.19LSB
NEGATIVE DNL = –0.20LSB
53,522
43,622
15,598
15,645
49,152
1662
800
30
6
AD7985
65,536
0
0