AD7946 Analog Devices, AD7946 Datasheet - Page 8

• Manufacturer Part Number: AD7946
• Manufacturer: Analog Devices

Specifications of AD7946

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 500kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

AD7946
TYPICAL PERFORMANCE CHARACTERISTICS
300000
250000
200000
150000
100000
50000
–0.2
–0.4
–0.6
–0.8
–1.0
–100
–120
–140
–160
–180
1.0
0.8
0.6
0.4
0.2
–20
–40
–60
–80
0
0
0
0
Figure 7. Histogram of a DC Input at the Code Center
0
2009
20
0
Figure 6. Integral Nonlinearity vs. Code
40
200A
4096
0
60
80 100 120 140 160 180 200 220 240
Figure 8. FFT Plot
200B
FREQUENCY (kHz)
0
CODE IN HEX
CODE
8192
261120
8192 POINT FFT
VDD = REF = 5V
f
f
SNR = 85.3dB
THD = –105.2dB
SECOND HARMONIC = –106dB
THIRD HARMONIC = –110dB
200C
S
IN
= 500kSPS
= 20.14kHz
POSITIVE INL = +0.17LSB
NEGATIVE INL = –0.26LSB
200D
0
12288
VDD = REF = 5V
200E
0
200F
16384
0
Rev. A | Page 8 of 24
150000
125000
100000
75000
50000
25000
–0.2
–0.4
–0.6
–0.8
–1.0
Figure 10. Histogram of a DC Input at the Code Transition
1.0
0.8
0.6
0.4
0.2
90
88
86
84
82
80
0
–10
0
0
2059
Figure 9. Differential Nonlinearity vs. Code
0
–8
Figure 11. SNR vs. Input Level
4096
205A
0
INPUT LEVEL (dB)
131592
–6
205B
CODE IN HEX
CODE
8192
POSITIVE DNL = +0.20LSB
NEGATIVE DNL = –0.13LSB
129528
205C
–4
12288
VDD = REF = 5V
205D
0
–2
205E
16384
0