XC7SHU04_1 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 01 — 7 September 2009 8 of 14
NXP Semiconductors
XC7SHU04
Inverter
14. Application information
Some applications are:
• Linear amplifier (see Figure 12)
• In crystal oscillator design (see Figure 13)
Remark: All values given are typical unless otherwise specified.
Fig 11. Typical forward transconductance g
fs
as a function of the supply voltage at T
amb
=25°C
0246
40
30
10
0
20
mna400
V
CC
(V)
g
fs
(mA/V)
Maximum V
o(p-p)
=V
CC
− 1.5 V centered at 0.5 × V
CC
.
G
ol
= open loop gain
G
v
= voltage gain
R1 ≥ 3kΩ,R2≤ 1MΩ
Z
L
>10kΩ; G
ol
= 20 (typ.)
Typical unity gain bandwidth product is 5 MHz.
C1 = 47 pF (typ.)
C2 = 22 pF (typ.)
R1 = 1 MΩ to 10 MΩ (typ.)
R2 optimum value depends on the frequency and
required stability against changes in V
CC
or average
minimum I
CC
(I
CC
is typically 2 mA at V
CC
= 3 V and
f = 1 MHz).
Fig 12. Used as a linear amplifier Fig 13. Crystal oscillator configuration
U04
R1
R2
V
CC
Z
L
mna052
1 µF
mna053
U04
out
R2
R1
C1 C2
G
v
G
ol
1
R1
R2
-------
1G
ol
+()+
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–=