AD9617AQ データシートの表示（PDF） - Analog Devices
部品番号
コンポーネント説明
メーカー
AD9617AQ Datasheet PDF : 10 Pages
| |||
AD9617
The effective noise at the output of the amplifier can be deter-
mined by taking the root sum of the squares of Equation 11 and
applying the spectral noise values found in the typical graph
section. This applies to noise from the op amp only. Note that
both the noise figure and equivalent input offset voltages im-
prove as the closed loop gain is increased (by keeping RF fixed
and reducing RI with RN = 0 Ω).
400⍀
In CLI
RSERIES
RL
500⍀
CL
Figure 17. Capacitive Load Figure
Capacitive Load Considerations
Due to the low inverting input resistance (RS) and output buffer
design, the AD9617 can directly handle input and/or output
load capacitances of up to 20 pF. See the chart below.
A small series resistor can be used at the output of the amplifier
and outside of the feedback loop to facilitate driving larger ca-
pacitive loads or for obtaining faster settling time. For capacitive
loads above 20 pF, RSERIES should be considered.
APPLYING THE AD9617
The superior frequency and time domain specifications of the
AD9617 make it an obvious choice for driving flash converters
and buffering the outputs of high speed DACs. Its outstanding
distortion and noise performance make it well suited as a driver
for analog to digital converters (ADCs) with resolutions as high
as 16 bits.
Typical circuits for inverting and noninverting applications are
shown in Figures 20 and 21.
Closed-loop gain for noninverting configurations is determined
by the value of RI according to the equation:
G = 1 + RF
RI
(12)
+VS
3.3F
0.1F
0.1F
VIN
RIN
AD9617
VOUT
35
VOUT = 4V STEP
30 CL = 0pF
VOUT = 4V STEP
CLI = 0pF
25
20
15
10
5pF
4pF/DIV
25pF 10pF
4pF/DIV
INPUT CAPACITANCE – CLI
INPUT CAPACITANCE – CL
RSERIES = 0⍀
30pF
Figure 18. Input/Output Capacitance Comparisons
25
400⍀
RI
0.1F
0.1F
3.3F
–VS
Figure 20. Noninverting Operation
+VS
3.3F
0.1F
0.1F
20
15
10
5
0
0
20
40
60
80
100
CL – pF
Figure 19. Recommended RSERIES vs. CL
AD9617
VOUT
RI
VIN
RTERM
400⍀
0.1F
0.1F
3.3F
–VS
Figure 21. Inverting Operation
REV. B
–9–
Share Link: 