AD7866(Rev0) 查看數據表（PDF） - Analog Devices
零件编号
产品描述 (功能)
生产厂家
AD7866 Datasheet PDF : 20 Pages
| |||
AD7866
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7866 at 1 MHz sample
rate and 300 kHz input frequency. TPC 2 shows the signal-to-
(noise + distortion) ratio performance versus input frequency for
various supply voltages while sampling at 1 MSPS with an SCLK
of 20 MHz.
TPC 3a through TPC 4b show the power supply rejection ratio
versus AVDD supply ripple frequency for the AD7866 under differ-
ent conditions. The power supply rejection ratio is defined as the
ratio of the power in the ADC output at full-scale frequency f,
to the power of a 100 mV sine wave applied to the ADC AVDD
supply of frequency fS:
PSRR (dB) = 10 log (Pf/PfS)
Pf = Power at frequency f in ADC output, PfS = power at fre-
quency fS coupled onto the ADC AVDD supply. Here a 100 mV
peak-to-peak sine wave is coupled onto the AVDD supply while
the digital supply is left unaltered. TPCs 3a and 3b show the
PSRR of the AD7866 when there is no decoupling on the supply,
while TPCs 4a and 4b show the PSRR with decoupling capacitors
of 10 µF and 0.1 µF on the supply.
TPC 5 and TPC 6 show typical DNL and INL plots for the AD7866.
TPC 7 shows a graph of the total harmonic distortion versus analog
input frequency for various source impedances.
TPC 8 shows a graph of total harmonic distortion versus analog
input frequency for various supply voltages. See Analog Input
section.
Typical Performance Characteristics
0
4098 POINT FFT
fSAMPLE = 1MSPS
–15 fIN = 300kHz
SNR = 70.31dB
THD = –85.47dB
–35 SFDR = –86.64dB
–55
–75
–95
–115
0
50 100 150 200 250 300 350 400 450 500
FREQUENCY – kHz
TPC 1. Dynamic Performance
0
100mV p-p SINEWAVE ON AVDD
–10 2.5V EXT REFERENCE ON VREF
–20 TA = 25؇C
–30
–40
–50
VDD = 2.7V
VDD = 5.25V
–60
–70
–80
VDD = 4.75V
–90
VDD = 3.6V
–100
1k
10k
100k
1M
AVDD RIPPLE FREQUENCY – Hz
TPC 3a. PSRR vs. Supply Ripple Frequency,
without Supply Decoupling
–61
TA = 25 C
–63
–65
VDD = VDRIVE = 2.7V
–67
VDD = VDRIVE = 3.6V
–69
–71
VDD = VDRIVE = 5.25V
VDD = VDRIVE = 4.75V
–73
–75
10k
100k
INPUT FREQUENCY – Hz
TPC 2. SINAD vs. Input Frequency
1000k
–8–
0
100mV p-p SINEWAVE ON AVDD
–10 2.5V EXT REFERENCE ON DCAPA, DCAPB
TA = 25؇C
–20
–30
–40
–50
VDD = 5.25V
–60
VDD = 2.7V
–70
–80
–90
VDD = 4.75V
VDD = 3.6V
–100
1k
10k
100k
1M
AVDD RIPPLE FREQUENCY – Hz
TPC 3b. PSRR vs. Supply Ripple Frequency,
without Supply Decoupling
REV. 0
Share Link: 