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OPA659 Datasheet(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # OPA659
Description  Wideband, Unity-Gain Stable, JFET-Input OPERATIONAL AMPLIFIER
PDF  32 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

OPA659 Datasheet(HTML) 14 Page - National Semiconductor (TI)

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=
1
2 R C
p
F
F
GBP
4 R C
p
F
D
(1)
GBP
2 R C
p
F
D
f
=
-
3dB
(2)
OPA659
SBOS342B – DECEMBER 2008 – REVISED AUGUST 2009 ............................................................................................................................................ www.ti.com
To achieve a maximally flat second-order Butterworth
turn requires a total feedback capacitance of 0.46pF.
frequency response, the feedback pole should be set
Typical surface mount resistors have a parasitic
to:
capacitance of 0.2pF, leaving the required 0.26pF
value to achieve the required feedback pole. This
calculation gives an approximate 4.9MHz, –3dB
bandwidth computed by:
For
example,
adding
the
common
mode
and
differential mode input capacitance (0.7 + 2.8 =
3.5)pF
to
the
diode
source
with
the
20pF
capacitance, and targeting a 100k
Ω transimpedance
Table 3 lists the calculated component values and
gain using the 350MHz GBP for the OPA659,
–3dB bandwidths for various TIA gains and diode
requires a feedback pole set to 3.44MHz. This pole in
capacitance.
Table 3. OPA659 TIA Component Values and Bandwidth for Various Diode Capacitance and Gains
CDIODE = 10pF
CD
RF
CF
f–3dB
13.5 pF
1k
Ω
3.50pF
64.24MHz
13.5 pF
10k
Ω
1.11pF
20.31MHz
13.5 pF
100k
Ω
0.35pF
6.42MHz
13.5 pF
1M
Ω
0.11pF
2.03MHz
CDIODE = 20pF
23.5 pF
1k
Ω
4.62pF
48.69MHz
23.5 pF
10k
Ω
1.46pF
15.40MHz
23.5 pF
100k
Ω
0.46pF
4.87MHz
23.5 pF
1M
Ω
0.15pF
1.54MHz
CDIODE = 50pF
53.5 pF
1k
Ω
6.98pF
32.27MHz
53.5 pF
10k
Ω
2.21pF
10.20MHz
53.5 pF
100k
Ω
0.70pF
3.23MHz
53.5 pF
1M
Ω
0.22pF
1.02MHz
CDIODE = 100pF
103.5 pF
1k
Ω
9.70pF
23.20MHz
103.5 pF
10k
Ω
3.07pF
7.34MHz
103.5 pF
100k
Ω
0.97pF
2.32MHz
103.5 pF
1M
Ω
0.31pF
0.73MHz
14
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Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): OPA659



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