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參數(shù)資料
| 型號(hào)： | MC1494 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | LINEAR FOUR-QUADRANT MULTIPLIER INTEGRATED CIRCUIT |
| 中文描述： | 線性四象限乘法器集成電路 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 319K |
| 代理商： | MC1494 |
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MC1494
14
MOTOROLA ANALOG IC DEVICE DATA
DEFINITION OF SPECIFICATIONS
Because of the unique nature of a multiplier, i.e., two
inputs and one output, operating specifications are difficult to
define and interpret. Indeed the same specification may be
defined in several completely different ways depending upon
which manufacturer is doing the defining. In order to clear up
some of the mystery, the following definitions and examples
are presented.
Multiplier Transfer Function –
The output of the multiplier
may be expressed by the following equation:
VO = K[Vx
±
Viox – Vx(off)] [Vy
±
Vioy –Vy(off)]
±
VOO (1)
where, K =
scale factor
Vx=
“x” input voltage
Vy=
“y” input voltage
Viox=
“x” input offset voltage
Vioy=
“y” input offset voltage
Vx(off)=
“x” input offset adjust voltage
Vy(off)=
“y” input offset adjust voltage
VOO=
output offset voltage
The voltage transfer characteristic below indicates x, y
and output offset voltages.
VO
Output
Offset
Vx
x Offset
(Vy = + 10V)
VO
Vy
y Offset
(Vx = + 10V)
Output
Offset
Figure 28. Offset Voltages
Linearity –
Linearity is defined to be the maximum deviation
of output voltage from a straight line transfer function. It is
expressed as a percentage of full–scale output and is
measured for Vx and Vy separately, either using an X–Y
plotter (and checking the deviation from a straight line) or by
using the method shown in Figure 3. The latter method nulls
the output signal with the input signal, resulting in distortion
components proportional to the linearity.
Example: 0.35% linearity means
Vx Vy
10
VO=
±
(0.0035)(10 V)
Input Offset Voltage –
The input offset voltage is defined
from Equation (1). It is measured for Vx and Vy separately
and is defined to be that DC input offset adjust voltage (x or y)
that will result in minimum AC output when AC (5.0 Vpp,
1.0 kHz) is applied to the other input (y or x, respectively).
From Equation (1) we have:
VO(AC) = K [0
±
Viox –Vx(off)] [sin
ω
t]
adjust Vx(off) so that [
±
Viox –Vx(off)] = 0.
Output Offset Current and Voltage –
Output offset current
(IOO) is the DC current flowing in the output lead when
Vx = Vy = 0 and X and Y offset voltages are adjusted to zero.
Output offset voltage (VOO) is:
VOO = IOO RL
where RL is the load resistance.
NOTE:
Output offset voltage is defined by many
manufacturers with all inputs at zero but without adjusting X
and Y offset voltages to zero. Thus, it includes input offset
terms, an output offset term and a scale factor term.
Scale Factor –
Scale factor is the K term in Equation (1). It
determines the gain of the multiplier and is expressed
approximately by the following equation.
2RL
RxRyl1
K =
, where Rx and Ry >>ql1
and l1 is the current out of Pin 1.
Total DC Accuracy –
The total DC accuracy of a multiplier is
defined as error in multiplier output with DC (
±
10 Vdc)
applied to both inputs. It is expressed as a percent of full
scale. Accuracy is not specified for the MC1494 because
error terms can be nulled by the user.
Temperature Stability (Drift) –
Each term defined above will
have a finite drift with temperature. The temperature
specifications are obtained by readjusting the multiplier
offsets and scale factor at each new temperature (see
previous definitions and the adjustment procedure) and
noting the change.
Assume inputs are grounded and initial offset voltages
have been adjusted to zero. Then output voltage drift is
given by:
VO =
±
[K
±
K (TCK) (
T)] [(TCViox) (
T)]
[(TCVioy) (
T)]
±
(TCVOO) (
T)
Total DC Accuracy Drift –
This is the temperature drift in
output voltage with 10 V applied to each input. The output is
adjusted to 10 V at TA = + 25
°
C. Assuming initial offset
voltages have been adjusted to zero at TA = +25
°
C, then:
VO = [ K
±
K (TCK) (
T)] [10
±
(TCViox) (
T)]
[10
±
(TCVioy) (
T)]
±
(TCVOO) (
T)
Power Supply Rejection –
Variation in power supply
voltages will cause undesired variation of the output voltage.
It is measured by superimposing a 1.0 V, 100 Hz signal on
each supply (
±
15 V) with each input grounded. The resulting
change in the output is expressed in mV/V.
Output Voltage Swing –
Output voltage swing capability is
the maximum output voltage swing (without clipping) into a
resistive load. (Note, output offset is adjusted to zero).
If an op amp is used, the multiplier output becomes a
virtual ground – the swing is then determined by the scale
factor and the op amp selected.
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