HA-2547 查看數據表（PDF） - Intersil

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HA-2547

100MHz, Two Quadrant, Current Output, Analog Multiplier

Intersil 

HA-2547

The transfer equation for the HA-2547 is:

IOUT = V-----OR----ZU----T-- = (---V----X----+----–-----V-S---X--F-----)-×--(--V-R---Y--Z--+-----–----V-----Y-------) , where

SF = Scale Factor

RZ = 2.5kV (Internal)

VX, VY = Differential Inputs

The scale factor is used to maintain the output of the

multiplier within the normal operating range of ±5V. The

scale factor can be defined by the user by way of an optional

external resistor, REXT, and the Gain Adjust pins: Gain

Adjust A (GA A), Gain Adjust B (GA B), and Gain Adjust C

(GA C). The scale factor is determined as follows:

SF = 2, when GA B is shorted to GA C

SF ≈ (1.2)(REXT), when REXT is connected between GA A

and GA C (REXT is in kΩ)

SF ≈ (1.2)(REXT + 1.667kΩ), when REXT is connected to

GA B and GA C (REXT is in kΩ).

The scale factor can be adjusted from 2 to 5. It should be

noted that any adjustments to the scale factor will affect the

AC performance of the control channel, VX. The normal

input operating range of VX is equal to the scale factor value.

A typical multiplier configuration is shown in Figure 3. The

ideal transfer function for this configuration is shown below,

illustrating two quadrant operation:

VOUT = (---V----X----+-----–----V-----X------)-2--(---V----Y----+----–-----V----Y-------) ,

when (VX+–VX-) ≥ 0

VOUT = 0, when (VX+–VX- ) < 0

The multiplication error is trimmed to be minimum at full

scale, VX = 2V and VY = ±5V. When VY = ±5V, the worst

case multiplication error occurs when VX ≈ 0.8V (Refer to

typical performance curves).

VY

-15V

1

16

REF

2

15

3

14

4

5

+-

6

13

+-

12

X

11

7

10

8

9

+15V

-

+

-15V

VX

+15V

VOUT

RL

FIGURE 3.

Operation At Various Supply Voltages

The HA-2547 will operate over a range of supply voltages,

±8V to ±15V. Use of supply voltages below ±12V will cause

degradation of electrical parameters.

Offset Adjustment

The signal channel offset voltage may be nulled by using a

20K potentiometer between VYIO Adjust pins A and B and

connecting the wiper to V-. Reducing the signal channel

offset voltage will reduce VX AC feedthrough and improve

the multiplication error.

The VX- pin is usually connected to ground so that when

VX+ is negative there is no signal at the output, i.e. two

quadrant operation. If the VX input is a negative going signal

the VX+ pin maybe grounded and the VX- pin used as the

input. The VY- terminal is usually grounded allowing VY+ to

swing ±5V. RZ is normally used as a feedback resistor for an

external op amp to provide an accurate current-to-voltage

conversion. The scale factor is normally set to 2 by

connecting GA B to GA C. Therefore, the transfer function

becomes:

VOUT = (---V----X-----+----)2--(--V-----Y----+----)

5

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