AD7904 Analog Devices, AD7904 Datasheet - Page 12

• Manufacturer Part Number: AD7904
• Description: 4-Channel, 1 MSPS, 8-Bit A/D Converter with Sequencer in 16-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7904

• Resolution (bits): 8bit
• # Chan: 4
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: SOP

AD7904/AD7914/AD7924
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5. AD7924 SINAD vs. Analog Input Frequency for Various Supply
Figure 6. AD7924 PSRR vs. Supply Ripple Frequency (No Decoupling)
–110
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–30
–50
–70
–90
75
70
65
60
55
0
10
0
0
f
T
RANGE = 0V TO REF
AV
200mV p-p SINE WAVE ON AV
REF
T
SAMPLE
Figure 4. AD7924 Dynamic Performance at 1 MSPS
A
A
= 25°C
DD
= 25°C
100
IN
50
= 5V
= 2.5V, 1µF CAPACITOR
= 1MSPS
Voltages at 1 MSPS, SCLK = 20 MHz
200
100
SUPPLY RIPPLE FREQUENCY (kHz)
300
150
INPUT FREQUENCY (kHz)
IN
FREQUENCY (kHz)
400
200
100
500
250
DD
600
300
AV
AV
AV
AV
DD
DD
DD
700
350
DD
4096 POINT FFT
AV
f
f
SINAD = 71.147dB
THD = –87.229dB
SFDR = –90.744dB
SAMPLE
IN
= V
= V
= V
= V
DD
= 50kHz
DRIVE
DRIVE
DRIVE
800
400
DRIVE
= 5V
= 1MSPS
= 2.7V
= 5.25V
= 4.75V
900
450
= 3.6V
1000
1
500
000
Rev. B | Page 12 of 32
Figure 7. AD7924 THD vs. Analog Input Frequency for Various Supply
Figure 8. AD7924 THD vs. Analog Input Frequency for Various Source
–0.2
–0.4
–0.6
–0.8
–1.0
–50
–55
–60
–65
–70
–75
–80
–85
–90
–50
–55
–60
–65
–70
–75
–80
–85
–90
1.0
0.8
0.6
0.4
0.2
0
10
10
0
f
T
RANGE = 0V TO REF
f
T
RANGE = 0V TO REF
AV
T
AV
SAMPLE
SAMPLE
A
A
A
DD
DD
= 25°C
= 25°C
= 25°C
512
= 5.25V
= V
= 1MSPS
= 1MSPS
DRIVE
1024
Figure 9. AD7924 Typical INL
AV
= 5V
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
DD
Voltages at 1 MSPS
R
IN
1536
IN
= V
IN
Impedances
= 1000Ω
DRIVE
CODE
2048
100
100
= 5.25V
AV
AV
2560
DD
R
DD
IN
AV
= V
= V
= 100Ω
DD
DRIVE
3072
DRIVE
= V
DRIVE
= 2.7V
= 4.75V
R
R
3584
IN
IN
= 3.6V
= 10Ω
= 50Ω
1000
1000
4
096