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參數(shù)資料
| 型號(hào)： | 5962-9451701M2A |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, CQCC20 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 281K |
| 代理商： | 5962-9451701M2A |
Fig. 2 illustrates the resulting CLC522 bandwidths as a
function of the maximum and minimum input voltages
when Vout is held constant at 1Vpp.
Adjusting Offsets
Treating the offsets introduced by the input and output
stages of the CLC522 is easily accomplished with a two
step process. The offset voltage of the output stage is
treated by first applying -1.1Volts on Vg, which effectively
isolates the input stage and multiplier core from the
output stage. As illustrated in Fig. 3, the trim pot located
at R14 on the CLC522 Evaluation Board should then be
adjusted in order to null the offset voltage seen at the
CLC522's output (pin 10). Once this is accomplished, the
offset errors introduced by the input stage and multiplier
core can then be treated. The second step requires the
absence of an input signal and matched source imped-
ances on the two input pins in order to cancel the bias
current errors. This done then +1.1Volts should be
applied to Vg and the trim pot located at R10 adjusted in
order to null the offset voltage seen at the CLC522's
output. If a more limited gain range is anticipated, the
above adjustments should be made at these operating
points.
Gain Errors
The CLC522's gain equation as theoretically expressed
in Eq. 2 must include the device's error terms in order to
yield the actual gain equation. Each of the gain error
Fig. 2
Fig. 3
terms are specified in the Electrical Characteristics table
and are defined below and illustrated in Fig. 4.
GACCU
: error of AVmax , expressed as ±dB.
GCNL
: deviation from theoretical expressed as ±%.
Vg
high : voltage on Vg producing A Vmax .
Vg
low : voltage on Vg producing
AV
min = 0V/V.
V
g
high
,
V
g
low
: error of Vg
high
,Vg
low
expresed as ±m(xù)V.
Combining these error terms with Eq. 2 gives the "gain
envelope" equation and is expressed in Eq. 7. From the
Electrical Characteristics table, the nominal endpoint
values of Vg are: Vghigh =+990mV and Vg
low
= -975mV.
Signal-Channel Nonlinearity
Signal-channel nonlinearity, SGNL, also known as integral
endpoint linearity, measures the non-linearity of an
amplifier’s voltage transfer function. The CLC522's SGNL,
as it is specified in the Electrical Characteristics table, is
measured while the gain is set at its maximum (i.e.
Vg=+1.1V). The Typical Performance Characteristics
plot labled "SGNL & Gain vs Vg" illustrates the CLC522's
SGNL as Vg is swept through its full range. As can be
seen in this plot, when the gain as reduced from AVmax ,
SGNL improves to < 0.02%(-74dB) at Vg=0 and then
degrades somewhat at the lowest gains.
Noise
Fig. 5 describes the CLC522's input-refered spot noise
density as a function of AVmax . The plot includes all the
noise contributing terms. At AVmax = 10V/V, the CLC522
has a typical input-referred spot noise density (eni) of
5.8nV/
√Hz. The input RMS voltage noise can be deter-
mined from the following single-pole model:
Eq. 8
Further discussion and plots of noise and the noise model
is provided in Application Note OA-23. Comlinear also
provides SPICE models that model internal noise and
other parameters for a typical part.
AVmax
AV
AVmin
Vg
low
Vg
high
Vg
±GCNL
±GACCU
±
Vg
high
±
Vg
low
Fig. 4
Eq . 7
AA
VV
V
VV
V
GCNL
VV
GACCU
gg
g
gg
g
low
high
low
=
±
()
±
()
±
()
±
max
10
1
20
2
V
e
dB bandwidth
RMS
in
=
()
157
3
.
5
http://www.national.com
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