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| 型號(hào)： | DIV100 |
| 英文描述： | DIV100 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| 中文描述： | DIV100 -已停產(chǎn)產(chǎn)品。不再推薦用于新設(shè)計(jì)。 |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | DIV100 |
6
DIV100
0.5% AMPLITUDE ERROR
At high frequencies the input-to-output relationship is a
complex function that produces both a magnitude and vector
error. The 0.5% amplitude error is the frequency at which
the magnitude of the output drops 0.5% from its DC value.
0.57
°
VECTOR ERROR
The 0.57
°
vector error is the frequency at which a phase
error of 0.01 radians occurs. This is the most sensitive
measure of dynamic error of a divider.
LINEARITY
Defining linearity for a nonlinear device may seem
unnecessary; however, by keeping one input constant the
output becomes a linear function of the remaining input. The
denominator is the input that is held fixed with a divider.
Nonlinearities in a divider add harmonic distortion to the
output in the amount of:
Percent Nonlinearity
Percent Distortion
≈
FEEDTHROUGH
Feedthrough is the signal at the output for any value of
denominator within its rated range, when the numerator
input is zero. Ideally, the output should be zero under this
condition.
GENERAL INFORMATION
WIRING PRECAUTIONS
In order to prevent frequency instability due to lead
inductance of the power supply lines, each power supply
should be bypassed. This should be done by connecting a
10
μ
F tantalum capacitor in parallel with a 1000pF ceramic
capacitor from the +V
CC
and –V
CC
pins to the power supply
common. The connection of these capacitors should be as
close to the DIV100 as practical.
CAPACITIVE LOADS
Stable operation is maintained with capacitive loads of up to
1000pF, typically. Higher capacitive loads can be driven if
a 22
carbon resistor is connected in series with the DIV100’s
output.
OVERLOAD PROTECTION
The DIV100 can be protected against accidental power
supply reversal by putting a diode (1N4001 type) in series
with each power supply line as shown in Figure 2. This
precaution is necessary only in power systems that momen-
tarily reverse polarity during turn-on or turn-off.
If this protection circuit is used, the accuracy of the DIV100
will be degraded by the power supply sensitivity specifica-
DEFINITIONS
TRANSFER FUNCTION
The ideal transfer function for the DIV100 is:
V
OUT
= 10N/D
where: N = Numerator input voltage
D = Denominator input voltage
10 = Internal scale factor
Figure 1 shows the operating region over the specified
numerator and denominator ranges. Note that below the
minimum denominator voltage (250mV) operation is
undefined.
ACCURACY
Accuracy is specified as a percentage of full-scale output
(FSO). It is derived from the total error specification.
TOTAL ERROR
Total error is the deviation of the actual output from the ideal
quotient 10N/D expressed in percent of FSO (10V); e.g., for
the DIV100K:
V
OUT (ACTUAL)
= V
OUT (IDEAL)
±
total error,
where: Total error = 0.25%, FSO = 25mV.
It represents the sum of all error terms normally associated
with a divider: numerator nonlinearity, denominator
nonlinearity, scale-factor error, output-referred numerator
and denominator offsets, and the offset due to the output
amplifier. Individual errors are not specified because it is
their sum that affects the user’s application.
SMALL-SIGNAL BANDWIDTH
Small-signal bandwidth is the frequency the output drops
to 70% (–3dB) of its DC value. The input signal must be low
enough in amplitude to keep the divider’s output from
becoming slew-rate limited. A rule-of-thumb is to make the
output voltage 100mVp-p, when testing this parameter.
Small-signal bandwidth is directly proportional to denomi-
nator magnitude as described in the Typical Performance
Curves.
FIGURE 1. Operating Region.
√
2
10
8
6
4
2
0
–2
–4
–6
–8
–10
7
8
9
V
OUT
= 10V
V
OUT
= 8V
V
OUT
= 6V
V
OUT
= 4V
V
OUT
= 2V
V
OUT
= 0V
V
OUT
= –2V
V
OUT
= –4V
V
OUT
= –6V
V
OUT
= –8V
V
OUT
= –10V
N
Constant V
OUT
Lines
D
MIN
Denominator Voltage (V)
1
2
3
4
5
6
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