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參數(shù)資料
| 型號： | AD744JCHIPS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Rectangular Connector; Series:516; No. of Contacts:20; Gender:Male; Color:Grey; Leaded Process Compatible:Yes; Insulator Material:Polycarbonate RoHS Compliant: Yes |
| 中文描述： | OP-AMP, 2000 uV OFFSET-MAX, 13 MHz BAND WIDTH, UUC9 |
| 封裝： | DIE-9 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 914K |
| 代理商： | AD744JCHIPS |
REV. PrF
PRELIMINARY TECHNICAL DATA
–15–
AD7450A/AD7440
Figure 10.
Input Common Mode Range versus V
REF
(V
DD
= 3V and V
REF
(max) = 2V)
Figure 11 shows examples of the inputs to V
IN+
and V
IN-
for different values of V
REF
for V
DD
= 5 V. It also gives
the maximum and minimum common mode voltages for
each reference value according to figure 9.
Reference = 1.25 V (VREFmax/2)
VIN-
1.25 V peak to peak
Common Mode (CM)
CMmin= 0.625 V
CMmax= 4.42 V
Reference = 2.5 V (VREFmax)
2.5 V peak to peak
Common Mode (CM)
CMmin= 1.25 V
CMmax= 3.75 V
VIN+
VIN+
VIN-
Figure 11. Examples of the Analog Inputs to V
IN+
and V
IN-
for Different Values of V
REF
for V
DD
= 5 V.
Analog Input Structure
Figure 12 shows the equivalent circuit of the analog input
structure of the AD7450A/AD7440. The four diodes
provide ESD protection for the analog inputs. Care must
be taken to ensure that the analog input signals never ex-
ceed the supply rails by more than 300mV. This will
cause these diodes to become forward biased and start
conducting into the substrate. These diodes can conduct
up to 10mA without causing irreversible damage to the
part. The capacitors C1, in figure 12 are typically 4pF
and can primarily be attributed to pin capacitance. The
resistors are lumped components made up of the on-resis-
tance of the switches. The value of these resistors is
typically about 100 . The capacitors, C2, are the ADC’s
sampling capacitors and have a capacitance of 16pF typi-
cally.
For ac applications, removing high frequency components
from the analog input signal is recommended by the use of
an RC low-pass filter on the relevant analog input pins.
In applications where harmonic distortion and signal to
noise ratio are critical, the analog input should be driven
from a low impedance source. Large source impedances
will significantly affect the ac performance of the ADC.
This may necessitate the use of an input buffer amplifier.
The choice of the opamp will be a function of the particu-
lar application.
VDD
C1
D
D
VIN+
R1
C2
VIN-
R1
C2
VDD
D
D
C1
Figure 12. Equivalent Analog Input Circuit.
Conversion Phase - Switches Open
Track Phase - Switches Closed
When no amplifier is used to drive the analog input, the
source impedance should be limited to low values. The
maximum source impedance will depend on the amount of
Total Harmonic Distortion (THD) that can be tolerated.
The THD will increase as the source impedance increases
and performance will degrade. Figure 13 shows a graph
of the THD versus analog input signal frequency for dif-
ferent source impedances for both V
DD
= 5 V and 3 V.
Figure 13.THD vs Analog Input Frequency for Various
Source Impedances
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| AD744JR-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP ±18V 8-Pin SOIC N T/R |
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