AD7478 Analog Devices, AD7478 Datasheet - Page 11

• Manufacturer Part Number: AD7478
• Description: 8-Bit, 1 MSPS, Low Power Successive Approximation ADC Which Operates From A Single 2.35 V to 5.25 V Power Supply
• Manufacturer: Analog Devices

Specifications of AD7478

• Resolution (bits): 8bit
• # Chan: 1
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOT

TYPICAL PERFORMANCE CHARACTERISTICS
–115
–115
–100
–15
–35
–55
–75
–95
–15
–35
–55
–75
–95
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
Figure 5. AD7476 Dynamic Performance at 600 kSPS
0
0
0
Figure 4. AD7476 Dynamic Performance at 1 MSPS
Figure 6. AD7477 Dynamic Performance at 1 MSPS
50
50
50
100
100
150
150
100
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
200
200
150
250
250
300
300
200
8192 POINT FFT
f
f
SINAD = 71.71dB
THD = –80.88dB
SFDR = –83.23dB
350
350
SAMPLE
IN
8192 POINT FFT
f
f
SINAD = 71.67dB
THD = –81.00dB
SFDR = –81.63dB
8192 POINT FFT
f
f
SINAD = 61.66dB
THD = –80.64dB
SFDR = –85.75dB
SAMPLE
IN
SAMPLE
IN
= 100kHz
= 100kHz
= 100kHz
400
400
250
= 600kSPS
= 1MSPS
= 1MSPS
450
450
300
500
500
Rev. F | Page 11 of 24
–69.0
–69.5
–70.0
–70.5
–71.0
–71.5
–72.0
–72.5
–10
–20
–30
–40
–50
–60
–70
–80
–90
–66
–67
–68
–69
–70
–71
–72
–73
Figure 8. AD7476 SINAD vs. Input Frequency at 993 kSPS
Figure 9. AD7476 SINAD vs. Input Frequency at 605 kSPS
0
10k
10k
0
Figure 7. AD7478 Dynamic Performance at 1 MSPS
SCLK = 20MHz
SCLK = 12MHz
50
100
150
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
AD7476/AD7477/AD7478
FREQUENCY (kHz)
200
V
DD
100k
100k
= 5.25V
250
300
V
DD
V
350
DD
8192 POINT FFT
f
f
SINAD = 49.82dB
THD = –75.22dB
SFDR = –67.78dB
= 2.35V
SAMPLE
IN
= 3.6V
= 100kHz
V
V
V
V
V
V
400
DD
DD
DD
DD
DD
DD
V
= 2.7V
DD
= 2.35V
= 2.7V
= 5.25V
= 4.75V
= 3.6V
= 1MSPS
450
= 4.75V
500
1M
1M