參數(shù)資料
型號(hào)： AD7928BRU-REEL7
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs 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(yè)數(shù)： 12/24頁(yè)
文件大?。?/td> 607K
代理商： AD7928BRU-REEL7
AD7908/AD7918/AD7928
–
Typical Performance Characteristics
REV. A
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7928 at 1 MSPS
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 1 MSPS
with an SCLK of 20 MHz.
TPC 3 shows the power supply rejection ratio versus supply
ripple frequency for the AD7928 when no decoupling is used.
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
Pfs
(
)
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
AD7928.
FREQUENCY (kHz)
–10
0
100
200
300
400
500
S
–30
–50
–70
–90
–110
50
150
250
350
450
4096 POINT FFT
AV
DD
= 5V
f
SAMPLE
= 1MSPS
f
SINAD = 71.147dB
THD = –87.229dB
SFDR = –90.744dB
TPC 1. AD7928 Dynamic Performance at 1 MSPS
INPUT FREQUENCY (kHz)
75
10
1000
S
70
65
60
55
100
f
SAMPLE
= 1MSPS
T
RANGE = 0 TO REF
IN
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 2. AD7928 SINAD vs. Analog Input Frequency for
Various Supply Voltages at 1 MSPS
SUPPLY RIPPLE FREQUENCY (kHz)
0
0
1000
P
–40
–60
–80
–90
500
–20
–50
–70
900
800
700
600
400
300
200
100
AV
= 5V
200mV p-p SINE WAVE ON AV
DD
REF
= 2.5V, 1 F CAPACITOR
T
A
= 25 C
–10
–30
TPC 3. AD7928 PSRR vs. Supply Ripple Frequency
INPUT FREQUENCY (kHz)
–50
10
1000
T
–65
–75
–85
–90
–60
–70
–80
100
–55
AV
DD
= V
DRIVE
= 5.25V
AV
DD
= V
DRIVE
= 4.75V
AV
DD
= V
DRIVE
= 2.7V
f
SAMPLE
= 1MSPS
T
RANGE = 0 TO REF
IN
AV
DD
= V
DRIVE
= 3.6V
TPC 4. AD7928 THD vs. Analog Input Frequency for
Various Supply Voltages at 1 MSPS
INPUT FREQUENCY (kHz)
–50
10
1000
T
–65
–75
–85
–90
–60
–70
–80
100
–55
f
SAMPLE
= 1MSPS
T
RANGE = 0 TO REF
IN
AV
DD
= 5.25V
R
IN
= 1000
R
IN
= 10
R
IN
= 50
R
IN
= 100
TPC 5. AD7928 THD vs. Analog Input Frequency for
Various Source Impedances
–12–
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