AD7923 Analog Devices, AD7923 Datasheet - Page 8

• Manufacturer Part Number: AD7923
• Description: 4-Channel 200 kSPS, 12-Bit A/D Converter with Sequencer in 16-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7923

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 200kSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: SOP

AD7923
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5. SINAD vs. Analog Input Frequency for Various Supply Voltages at
–110
–10
–30
–50
–70
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
75
70
65
60
0
0
0
0
AV
200mV p-p SINE WAVE ON AV
REF
T
f
T
RANGE = 0V TO REF
A
SAMPLE
Figure 4. Dynamic Performance at 200 kSPS
A
DD
= 25°C
Figure 6. PSRR vs. Supply Ripple Frequency
10
20
= 25°C
IN
= 5V
= 2.5V, 1μF CAPACITOR
20
= 200kSPS
40
SUPPLY RIPPLE FREQUENCY (kHz)
30
60
INPUT FREQUENCY (kHz)
FREQUENCY (kHz)
200 kSPS
IN
40
80
100
50
DD
120
60
AV
AV
AV
AV
4096 POINT FFT
AV
f
f
SINAD = 70.714dB
THD = –82.853dB
SFDR = –84.815dB
DD
DD
DD
DD
SAMPLE
IN
140
70
DD
= 50 kHz
= V
= V
= V
= V
= 4.75V
DRIVE
DRIVE
DRIVE
DRIVE
160
80
= 200kSPS
= 5.25V
= 4.75V
= 3.6V
= 2.7V
180
90
100
100
200
Rev. C | Page 8 of 24
Figure 8. THD vs. Analog Input Frequency for Various Source Impedances
–0.2
–0.4
–0.6
–0.8
–1.0
–50
–55
–60
–65
–70
–75
–80
–85
–90
–55
–60
–65
–70
–75
–80
–85
–90
–95
1.0
0.8
0.6
0.4
0.2
0
10
10
0
AV
TEMP = 25 ° C
f
T
RANGE = 0V TO REF
f
T
AV
RANGE = 0V TO REF
SAMPLE
SAMPLE
A
A
DD
DD
= 25°C
= 25°C
Figure 7. THD vs. Analog Input Frequency
512
for Various Supply Voltages at 200 kSPS
= V
= 5.25V
= 200kSPS
= 200kSPS
DRIVE
1024
= 5V
Figure 9. Typical INL
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
1536
AV
IN
AV
IN
R
R
IN
DD
IN
DD
= 1000Ω
= 100Ω
= V
CODE
= V
2048
DRIVE
DRIVE
R
IN
= 50Ω
2560
= 4.75V
= 3.6V
AV
AV
DD
DD
= V
3072
= V
R
DRIVE
DRIVE
IN
= 10Ω
= 2.7V
= 5.25V
3584 4096
100
100