AD7997 Analog Devices, AD7997 Datasheet - Page 12

• Manufacturer Part Number: AD7997
• Description: 8-Channel, 10-Bit ADC with I2C Compatible Interface in 20-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7997

• Resolution (bits): 10bit
• # Chan: 8
• Sample Rate: 79kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: SOP

AD7997/AD7998
TYPICAL PERFORMANCE CHARACTERISTICS
–100
–120
–110
–20
–40
–60
–80
–10
–30
–50
–70
–90
100
30
90
80
70
60
50
40
20
0
Figure 4. AD7998 Dynamic Performance with 5 V Supply and
Figure 5. AD7997 Dynamic Performance with 5 V Supply and
10
0
0
V
DD
= 3V
Figure 6. PSRR vs. Supply Ripple Frequency
10
SUPPLY RIPPLE FREQUENCY (kHz)
2.5 V Reference, 121 kSPS, Mode 1
2.5 V Reference, 121 kSPS, Mode 1
V
INPUT FREQUENCY (kHz)
DD
20
20
= 5V
FREQUENCY (kHz)
100
30
V
200mV p-p SINE WAVE
ON V
2nF CAPACITOR ON V
DD
= 3V/5V
40
40
DD
FS = 121kSPS
FSCL = 3.4MHz
FIN = 10kHz
SNR = 71.84dB
SINAD = 71.68dB
THD = 86.18dB
SFDR = –88.70dB
FS = 121kSPS
FSCL = 3.4MHz
FIN = 10kHz
SINAD = 61.63dB
THD = 91.82dB
SFDR = –94.95dB
50
DD

1000
60
60
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–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
65
55
75
70
60
50
45
40
Figure 9. Typical DNL, V
Figure 8. Typical INL, V
0
0
1
0
0
Figure 7. AD7998 SINAD vs. Analog Input Frequency for
500
500
Various Supply Voltages, 3.4 MHz f
1000
1000
10
1500
1500
FREQUENCY (kHz)
DD
DD
= 5.5 V, Mode 1, 3.4 MHz f
= 5.5 V, Mode 1, 3.4 MHz f
CODE
2000
CODE
2000
V
DD
= 4.5V
2500
2500
V
DD
V
DD
100
= 3V
= 3.3V
3000
3000
SCL
, 136 kSPS
V
DD
V
V
= 2.7V
3500
3500
DD
DD
SCL
SCL
= 5.5V
, 121 kSPS
= 5V
, 121 kSPS
4000
4000
1000