AD7265 Analog Devices, AD7265 Datasheet - Page 9

• Manufacturer Part Number: AD7265
• Description: Differential/Single-Ended Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7265

• Resolution (bits): 12bit
• # Chan: 12
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, unless otherwise noted.
A
Figure 6. SINAD vs. Analog Input Frequency for Various Supply Voltages
Figure 4. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–100
–110
–120
–100
74
72
70
68
66
–60
–70
–80
–90
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
0
0
0
V
100mV p-p SINE WAVE ON AV
NO DECOUPLING
SINGLE-ENDED MODE
DD
200
100
= 5V
DIFFERENTIAL MODE
EXTERNAL REFERENCE
Figure 5. Channel-to-Channel Isolation
400
200
SUPPLY RIPPLE FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
600
300
NOISE FREQUENCY (kHz)
V
DD
800
400
= 3V
INTERNAL REFERENCE
500
1000 1200 1400 1600 1800
500
DD
600
V
DIFFERENTIAL MODE
DD
RANGE = 0 TO V
700
= 5V
800
900
REF
1000
2000
1000
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–110
–10
–30
–50
–70
–90
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
0
0
0
0
0
50
500
500
100
1000
1000
150
Figure 8. Typical DNL
Figure 9. Typical INL
1500
FREQUENCY (kHz)
1500
200
Figure 7. FFT
2000
250
CODE
2000
CODE
300
2500
2500
4096 POINT FFT
V
F
F
SINAD = 71.4dB
THD = –84.42dB
DIFFERENTIAL MODE
SAMPLE
IN
DD
V
DIFFERENTIAL MODE
V
DIFFERENTIAL MODE
350
DD
DD
= 26kHz
= 5V, V
3000
3000
= 5V, V
= 5V, V
= 1MSPS
400
DRIVE
DRIVE
3500
DRIVE
3500
450
= 3V
AD7265
= 3V
= 3V
4000
4000
500