AD7680 Analog Devices, AD7680 Datasheet - Page 10

• Manufacturer Part Number: AD7680
• Manufacturer: Analog Devices

Specifications of AD7680

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 100kSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOP,SOT

AD7680
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5 shows a typical FFT plot for the AD7680 at 100 kSPS
sample rate and 10 kHz input frequency. Figure 6 shows the
signal-to-(noise + distortion) ratio performance versus the
input frequency for various supply voltages while sampling at
100 kSPS with an SCLK of 2.5 MHz.
–100
–120
–140
–160
–20
–40
–60
–80
95
90
85
80
0
10
0
F
T
Figure 5. AD7680 Dynamic Performance at 100 kSPS
SAMPLE
A
Figure 6. AD7680 SINAD vs. Analog Input Frequency
= 25°C
for Various Supply Voltages at 100 kSPS
= 100kSPS
10k
INPUT FREQUENCY (kHz)
FREQUENCY (kHz)
20k
V
V
DD
DD
= 5.25V
= 2.5V
30k
V
F
F
SNR = 88.28dB
SINAD = 87.82dB
THD = –97.76dB
SFDR = –98.25dB
SAMPLE
IN
DD
= 10kHz
= 5V
= 100kSPS
40k
V
V
V
V
V
DD
DD
DD
DD
DD
= 4.75V
= 4.3V
= 3.6V
= 3.0V
= 2.7V
50k
100
Rev. A | Page 10 of 24
Figure 7 shows a graph of the total harmonic distortion versus
the analog input frequency for various supply voltages, while
Figure 8 shows a graph of the total harmonic distortion versus
the analog input frequency for various source impedances (see
the Analog Input section). Figure 9 and Figure 10 show the
typical INL and DNL plots for the AD7680.
110
105
100
95
90
110
105
100
10
95
90
85
80
75
10
F
T
V
Figure 7. AD7680 THD vs. Analog Input Frequency
Figure 8. AD7680 THD vs. Analog Input Frequency
SAMPLE
A
DD
= 25°C
= 4.75V
for Various Supply Voltages at 100 kSPS
= 100kSPS
for Various Source Impedances
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
R
F
T
IN
R
R
SAMPLE
A
IN
IN
= 10Ω
R
= 25°C
IN
= 100Ω
= 1000Ω
= 50Ω
V
V
V
V
V
V
V
= 100kSPS
DD
DD
DD
DD
DD
DD
DD
= 4.3V
= 4.75V
= 3.6V
= 5.25V
= 3.0V
= 2.7V
= 2.5V
100
100