AD7656A-1_17 Datasheet, PDF (12/29 Pages) Analog Devices – 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar, 16-Bit ADC

Data Sheet
–80
V_DD/V_SS = ±16.5V
AV_CC/DV_CC/V_DRIVE = 5.25V
T_A = 25°C
INTERNAL REFERENCE
–90 ^{±4 × V}REF ^RANGE
R_SOURCE = 1000Ω
–100
R_SOURCE = 220Ω
R_SOURCE = 50Ω
–110
R_SOURCE = 10Ω
R_SOURCE = 100Ω
–120
10
100
ANALOG INPUT FREQUENCY (kHz)
Figure 10. THD vs. Analog Input Frequency for Various Source Impedances,
±4 × VREF Range
–80
V_DD/V_SS = ±12V
AV_CC/DV_CC/V_DRIVE = 5V
–85 TA = 25°C
INTERNAL REFERENCE
±2 × V_REF RANGE
–90
–95
R_SOURCE = 1000Ω
–100
–105
–110
R_SOURCE = 220Ω
R_SOURCE = 100Ω
R_SOURCE = 50Ω
R_SOURCE = 10Ω
–115
10
100
ANALOG INPUT FREQUENCY (kHz)
Figure 11. THD vs. Analog Input Frequency for Various Source Impedances,
±2 × VREF Range
2.510
AV_CC/DV_CC/V_DRIVE = 5V
2.508 ^{VDD/VSS = ±12V}
2.506
2.504
2.502
2.500
2.498
2.496
2.494
2.492
–55 –35 –15 5
25 45 65 85 105 125
TEMPERATURE (°C)
Figure 12. Reference Voltage vs. Temperature
AD7656A-1
3.20
3.15
AV_CC/DV_CC/V_DRIVE = 5V
V_DD/V_SS = ±12V
3.10
3.05
3.00
2.95
2.90
2.85
2.80
2.75
2.70
–55 –35 –15
5 25 45 65
TEMPERATURE (°C)
85 105 125
Figure 13. Conversion Time vs. Temperature
3500
3000
2500
2806
3212
V_DD/V_SS = ±15V
AV_CC/DV_CC/V_DRIVE = 5V
INTERNAL REFERENCE
8192 SAMPLES
2000
1500
1532
1000
500
392
0
57
0
168
25
0
–5
–4
–3
–2
–1
0
1
2
3
CODE
Figure 14. Histogram of Codes
100
f_SAMPLE = 250kSPS
±2 × V_REF RANGE
INTERNAL REFERENCE
90
T_A = 25°C
f_IN = 10kHz
100nF ON V_DD AND V_SS
80
70
V_SS
60
V_DD
50
40
30 80 130 180 230 280 330 380 430 480 530
SUPPLY RIPPLE FREQUENCY (kHz)
Figure 15. PSRR vs. Supply Ripple Frequency
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