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參數(shù)資料
| 型號： | AD7927BRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 8-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | MO-153AC, TSSOP-20 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大小： | 461K |
| 代理商： | AD7927BRU |
REV. 0
–8–
AD7927–Typical Performance Characteristics
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7927 at 200 kSPS
sample rate and 50 kHz input frequency. TPC 2 shows the
signal-to-(noise + distortion) ratio performance versus input
frequency for various supply voltages while sampling at 200 kSPS
with an SCLK of 20 MHz.
TPC 3 shows the power supply rejection ratio versus supply
ripple frequency for the AD7927 with no decoupling. 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 200 mV
p-p sine wave applied to the ADC AV
DD
supply of frequency f
S
:
=
10
Pf
is equal to the power at frequency f in ADC output;
Pf
S
is equal
to the power at frequency f
S
coupled onto the ADC AV
DD
supply.
Here a 200 mV p-p sine wave is coupled onto the AV
DD
supply.
PSRR dB
Pf Pf
s
/
(
)
log(
)
TPC 4 shows a graph of total harmonic distortion versus analog
input frequency for various supply voltages, while TPC 5 shows
a graph of total harmonic distortion versus analog input frequency
for various source impedances. See the Analog Input section.
TPC 6 and TPC 7 show typical INL and DNL plots for the
AD7927.
FREQUENCY – kHz
0
S
–90
100
–50
–70
80
60
40
20
–10
–30
–110
10
30
50
70
90
4096 POINT FFT
AV
DD
= 4.75V
f
SAMPLE
= 200kSPS
f
SINAD = 70.714dB
THD = 82.853dB
SFDR = 84.815dB
TPC 1. Dynamic Performance at 200 kSPS
INPUT FREQUENCY – kHz
75
0
100
S
70
65
60
f
SAMPLE
= 200kSPS
T
RANGE = 0 TO REF
IN
AV
DD
= V
DRIVE
= 5.25V
AV
DD
= V
DRIVE
= 4.75V
AV
DD
= V
DRIVE
= 3.6V
AV
DD
= V
DRIVE
= 2.7V
TPC 2. SINAD vs. Analog Input Frequency for Various
Supply Voltages at 200 kSPS
SUPPLY RIPPLE FREQUENCY – kHz
0
0
200
P
–40
–60
–80
–90
100
–20
–50
–70
180
160
140
120
80
60
40
20
AV
= 5V
200mV p-p SINE WAVE ON AV
DD
REF
IN
= 2.5V, 1 F CAPACITOR
T
A
= 25 C
–10
–30
TPC 3. PSRR vs. Supply Ripple Frequency
INPUT FREQUENCY – kHz
–50
10
100
T–65
–75
–85
–90
–55
–70
–80
f
SAMPLE
= 200kSPS
T
RANGE = 0 TO REF
IN
–60
AV
DD
= V
DRIVE
= 2.7V
AV
DD
= V
DRIVE
= 3.6V
AV
DD
= V
= 4.75V
AV
DD
= V
DRIVE
= 5.25V
TPC 4. THD vs. Analog Input Frequency for Various
Supply Voltages at 200 kSPS
INPUT FREQUENCY – kHz
–55
10
100
T–70
–80
–90
–95
–60
–75
–85
f
SAMPLE
= 200kSPS
T
A
AV
= 5.25V
RANGE = 0 TO REF
IN
–65
R
IN
= 50
R
IN
= 100
R
IN
= 10
R
IN
= 1000
TPC 5. THD vs. Analog Input Frequency for Various
Source Impedances
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