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參數(shù)資料
| 型號(hào)： | EVAL-AD7923CB2 |
| 廠商： | Analog Devices, Inc. |
| 元件分類(lèi)： | ADC |
| 英文描述： | 4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP |
| 中文描述： | 4通道，200 kSPS的，12位序列ADC的16引腳TSSOP |
| 文件頁(yè)數(shù)： | 8/20頁(yè) |
| 文件大?。?/td> | 430K |
| 代理商： | EVAL-AD7923CB2 |
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–8–
AD7923
–
Typical Performance Characteristics
REV. 0
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7923 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 AD7923 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
:
PSRR dB
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.
Pf Pf
s
/
(
)
log(
)
=
10
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
AD7923.
FREQUENCY – kHz
–10
0
20
40
60
80
100
S
–30
–50
–70
–90
–110
10
30
50
70
90
4096 POINT FFT
AV
DD
= 4.75V
f
SAMPLE
= 200kSPS
f
= 50kHz
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 V 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
= 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
= 25 C
RANGE = 0V TO REF
IN
–60
AV
DD
= V
DRIVE
= 2.7V
AV
DD
= V
DRIVE
= 3.6V
AV
DD
= V
DRIVE
= 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
= 25 C
AV
= 5.25V
RANGE = 0V 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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