BURR-BROWN MPY634 User Manual

OBSOLETE

SBFS017A – DECEMBER 1995 – REVISED DECEMBER 2004

Wide Bandwidth

PRECISION ANALOG MUL TIPLIER

MPY634

FEATURES

● WIDE BANDWIDTH: 10MHz typ

● ±0.5% MAX FOUR-QUADRANT

ACCURACY

● INTERNAL WIDE-BANDWIDTH OP AMP

● EASY TO USE

● LOW COST

APPLICATIONS

● PRECISION ANALOG SIGNAL

PROCESSING

● MODULATION AND DEMODULATION

● VOLTAGE-CONTROLLED AMPLIFIERS

● VIDEO SIGNAL PROCESSING

● VOLTAGE-CONTROLLED FILTERS AND

OSCILLATORS

SF

Voltage

Reference

and Bias

DESCRIPTION

The MPY634 is a wide bandwidth, high accuracy, four­quadrant analog multiplier. Its accurately laser-trimmed
multiplier characteristics make it easy to use in a wide
variety of applications with a minimum of external parts,
often eliminating all external trimming. Its differential X, Y,
and Z inputs allow configuration as a multiplier, squarer,
divider, square-rooter, and other functions while maintain­ing high accuracy.

The wide bandwidth of this new design allows signal
processing at IF, RF, and video frequencies. The internal
output amplifier of the MPY634 reduces
design complexity compared to other high frequency mul­tipliers and balanced modulator circuits. It is
capable of performing frequency mixing, balanced modula­tion, and demodulation with excellent carrier rejection.

An accurate internal voltage reference provides
precise setting of the scale factor. The differential Z input
allows user-selected scale factors from 0.1 to 10 using
external feedback resistors.

+V

S

–V

S

X

1

X

2

Y

1

Y

2

Z

1

Z

2

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

V-I

V-I

V-I

Multiplier

Core

0.75 Atten

V

OUT

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Transfer Function
(X1 – X2)(Y1 – Y2)

= A – (Z1 – Z2)

A

SF

V

OUT

Precision

Output

Op Amp

Copyright © 1995-2004, Texas Instruments Incorporated

SPECIFICATIONS

ELECTRICAL

At TA = +25°C and VS = ±15VDC, unless otherwise noted.

MPY634KP/KU MPY634AM MPY634BM MPY634SM

MODEL MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS

OBSOLETE

OBSOLETE

MULTIPLIER
PERFORMANCE

Transfer Function **
Total Error

(1)

(X1 – X2) (Y1 – Y2)

10V

+ Z

2

(X1 – X2) (Y1 – Y2)

10V

+ Z

2

(–10V ≤ X, Y ≤ +10V) ±2.0 ±1.0 ±0.5 * %

T

= min to max ±2.5 ±1.5 ±1.0 ±2.0 %

A

Total Error vs Temperature ±0.03 ±0.022 ±0.015 ±0.02 %/°C
Scale Factor Error

(SF = 10.000V Nominal)

(2)

±0.25 ±0.1 * * %

Temperature Coefficient of

Scaling Voltage ±0.02 ±0.01 ±0.01 * %/°C
Supply Rejection (±15V ±1V) ±0.01 ±0.01 * * %
Nonlinearity

X (X = 20Vp-p, Y = 10V) ±0.4 ±0.4 0.2 ±0.3 * %

Y (Y = 20Vp-p, X = 10V) ±0.01 ±0.01 * ±0.1 * %
Feedthrough

(3)

X (Y Nulled, X = 20Vp-p, 50Hz) ±0.3 ±0.3 ±0.15 ±0.3 * %

Y (X Nulled, Y = 20Vp-p, 50Hz) ±0.01 ±0.01 * ±0.1 * %

Both Inputs (500kHz, 1Vrms)

Unnulled 40 50 45 55 * 60 * * dB

Nulled 556055656070**dB
Output Offset Voltage ±50 ±100 ±5 ±30 * ±15 * * mV
Output Offset Voltage Drift * ±200 ±100 * ±500 µV/°C

DYNAMICS

Small Signal BW,

(V

= 0.1Vrms) 6 10 8 10 * * 6 * MHz

OUT

1% Amplitude Error

(C

= 1000pF) 100 100 * * kHz

LOAD

Slew Rate (V
Settling Time

(to 1%, ∆V

= 20Vp-p) 20 20 * * V/µs

OUT

= 20V) 2 2 * * µs

OUT

NOISE

Noise Spectral Density:

SF = 10V 0.8 0.8 * * µV/√Hz

Wideband Noise:

f = 10Hz to 5MHz 1 1 * * mVrms
f = 10Hz to 10kHz 90 90 * * µVrms

OUTPUT

Output Voltage Swing ±11 ±11 * * V
Output Impedance (f ≤ 1kHz) 0.1 0.1 * * Ω
Output Short Circuit Current

(R

= 0, TA = min to max) 30 30 * * mA

L

Amplifier Open Loop Gain

(f = 50Hz) 85 85 * * dB

INPUT AMPLIFIERS (X, Y and Z)

Input Voltage Range

Differential V
Common-Mode V
(see Typical Performance Curves)

(VCM = 0) ±12 ±12 * * V

IN

(V

= 0) ±10 ±10 * * V

IN

DIFF

Offset Voltage X, Y ±25 ±100 ±5 ±20 ±2 ±10 * * mV
Offset Voltage Drift X, Y 200 100 50 * µV/°C
Offset Voltage Z ±25 ±100 ±5 ±30 ±2 ±15 * * mV
Offset Voltage Drift Z 200 200 100 500 µV/°C
CMRR 60 80 60 80 70 90 * * dB
Bias Current 0.8 2.0 0.8 2.0 * * * * µA
Offset Current 0.1 0.1 * * 2.0 µA
Differential Resistance 10 10 * * MΩ

DIVIDER PERFORMANCE

Transfer Function (X
Total Error

(1)

> X2) **

1

untrimmed

(Z2 – Z1)

10V + Y

(X1 – X2)

(Z2 – Z1)

1

10V + Y

(X1 – X2)

1

(X = 10V, –10V ≤ Z ≤ +10V) 1.5 ±0.75 ±0.35 ±0.75 %
(X = 1V, –1V ≤ Z ≤ +1V) 4.0 ±2.0 ±1.0 * %
(0.1V≤ X ≤ 10V, –10V ≤ Z ≤ 10V) 5.0 ±2.5 ±1.0 * %

SQUARE PERFORMANCE

Transfer Function **

(X1 – X2)

10V

2

+ Z

2

(X1 – X2)

10V

2

+ Z

2

Total Error (–10V ≤ X ≤ 10V) ±1.2 ±0.6 ±0.3 * %

OBSOLETE

2

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MPY634

SBFS017A

SPECIFICATIONS (CONT)

ELECTRICAL

At TA = +25°C and VS = ±15VDC, unless otherwise noted.

MPY634KP/KU MPY634AM MPY634BM MPY634SM

MODEL MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
SQUARE-ROOTER

PERFORMANCE

Transfer Function (Z
Total Error

POWER SUPPLY

Supply Voltage:

Supply Current, Quiescent 4 6 4 6 * * * * mA

TEMPERATURE RANGE

Specification –40 +85 –25 +85 * * –55 +125 °C
Storage –40 +85 –65 +150 * * * * °C

* Specification same as for MPY634AM.
Gray indicates obsolete parts.
NOTES: (1) Figures given are percent of full scale, ±10V (i.e., 0.01% = 1mV). (2) May be reduced to 3V using external resistor between –V
component due to nonlinearity; excludes effect of offsets.

(1)

Rated Performance ±15 ±15 * * VDC
Operating ±8 ±18 ±8 ±18 * * * ±20 VDC

≤ Z2) **

1

(1V ≤ Z ≤ 10V) ±2.0 ±1.0 ±0.5 * %

√10V (Z2 – Z1) +X

OBSOLETE

2

√10V (Z2 – Z1) +X

OBSOLETE

2

PIN CONFIGURATIONS

OBSOLETE

and SF. (3) Irreducible

S

Top View

X

1

X

2

SF

2

Y

3

1

OBSOLETE

Y

TO-100: MPY634AM/BM/SM

10

1

4

2

5

–V

+V

S

9

8

7

6

Z

2

S

Out

Z

X
X

Scale Factor

1

Y
Y

Input

1

Input

2

Input

1

Input

2

NC

NC

1
2
3
4
5
6
7

ABSOLUTE MAXIMUM RATINGS

PARAMETER MPY634AM/BM MPY634KP/KU MPY634SM

Power Supply Voltage ±18 * ±20
Power Dissipation 500mW * *
Output Short-Circuit

to Ground Indefinite * *

Input Voltage ( all X,

Y and Z) ±V

Temperature Range:

Operating –25°C/+85°C –40°C/+85°C –55°C/+125°C
Storage –65°C/+150°C –40°C/+85°C*

Lead Temperature

(soldering, 10s) +300°C* *
SOIC ‘KU’ Package +260°C

* Specification same as for MPY634AM/BM.
NOTE: Gray indicates obsolete parts.

OBSOLETE OBSOLETE

S

**

1

1

2

Input

NC

NC
Input
Input

NC

1
2
3
4
5
6
7
8

SOIC: MPY634KUDIP: MPY634KP

X

14

+V

S

13

NC

12

Output

11

Z

Input

1

10

Z

Input

2

9

NC

8

–V

S

X2 Input

Scale Factor

Y
Y

16

+V

S

15

NC

14

Output

13

Z

Input

1

12

Z

Input

2

11

NC

10

–V

S

9

NC

ORDERING INFORMATION

Basic Model Number
Performance Grade

K: U: –40°C to +85°C

Package Code

P: Plastic 14-pin DIP
U: 16-pin SOIC

NOTE: (1) Performance grade identifier may not be marked on the SOIC
package; a blank denotes “K” grade.

(1)

MPY634 ( )( )

PACKAGE INFORMATION

PRODUCT PACKAGE NUMBER

MPY634KP 14-Pin PDIP 010
MPY634KU 16-Pin SOIC 211

NOTE: (1) For the most current package and ordering information, see the
Package Option Addendum located at the end of this data sheet.

(1)

PACKAGE DRAWING

MPY634

SBFS017A

www.ti.com

3

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = ±15VDC, unless otherwise noted.

–20

FEEDTHROUGH vs FREQUENCY

–40

X Feedthrough

–60

Y Feedthrough

–80

Feedthrough Attenuation (dB)

–100

100 1k 10k 1M 10M 100M

100k

Frequency (Hz)

COMMON-MODE REJECTION RATIO vs FREQUENCY

90
80
70
60

Typical for all inputs

50
40

CMRR (dB)

30
20
10

0

100 100M

10k 1M 10M

Frequency (Hz)

10

FREQUENCY RESPONSE AS A MULTIPLIER

Normal Connection

0

CL = 0pF

–10

With X10 Feedback

–20

Output Response (dB)

Attenuator

–30

1k 10k 100k 1M 10M 100M

Frequency (Hz)

FEEDTHROUGH vs TEMPERATURE

–50

–60

fY = 500kHz
V

= nulled

X

–70

nulled at 25°C

Feedthrough Attenuation (dB)

–80

–60

–20 20 60 100 140–40 0 40 80 120

Temperature (°C)

C

= 1000pF

L

NOISE SPECTRAL DENSITY

1.5

1.25

1

0.75

Noise Spectral Density (µV/√Hz)

0.5
10 100 10k 100k

vs FREQUENCY

1k

Frequency (Hz)

4

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60

FREQUENCY RESPONSE AS A DIVIDER

VX = 100mVDC
V

= 10mVrms

40

(dB)

2

/V

0

20

Output, V

Z

= 1VDC

V

X

V

= 100mVrms

Z

= 10VDC

V

X

V

= 100mVrms

Z

0

–20

1k 10k 100k 1M 10M 100M

Frequency (Hz)

MPY634

SBFS017A

TYPICAL PERFORMANCE CURVES (CONT)

TA = +25°C, VS = ±15VDC, unless otherwise noted.

INPUT/OUTPUT SIGNAL RANGE

vs SUPPLY VOLTAGES

14

INPUT DIFFERENTIAL-MODE/

COMMON-MODE VOLTAGE

10

V

CM

12

Output, RL ≥ 2kΩ

10

All inputs, SF = 10V

8

6

Peak Positive or Negative Signal (V)

4

81012 161820

Positive or Negative Supply (V)

14

Bias Current (nA)

800
700
600
500
400
300
200
100

BIAS CURRENTS vs TEMPERATURE

0

–60

–20 0 60 100 140

(X,Y or Z Inputs)

Scaling Voltage = 10V

Scaling Voltage = 3V

20–40 40 80 120

Temperature (°C)

5

Specified
Accuracy

–12 12

Functional
Derated Accuracy

–5510–10

VS = ±15V

–5

–10

V

DIFF

THEORY OF OPERATION

The transfer function for the MPY634 is:

V

OUT

where:

A = open-loop gain of the output amplifier (typically

85dB at DC).

SF = Scale Factor. Laser-trimmed to 10V but adjustable

over a 3V to 10V range using external resistors.

X, Y, Z are input voltages. Full-scale input voltage
is equal to the selected SF. (Max input voltage =
±1.25 SF).

An intuitive understanding of transfer function can be gained
by analogy to the op amp. By assuming that the open-loop
gain, A, of the output operational amplifier is infinite,

MPY634

SBFS017A

(X1 – X2) (Y1 – Y2)

= A – (Z1 – Z2)

SF

www.ti.com

inspection of the transfer function reveals that any V

OUT

can
be created with an infinitesimally small quantity within the
brackets. Then, an application circuit can be analyzed by
assigning circuit voltages for all X, Y and Z inputs and
setting the bracketed quantity equal to zero. For example,
the basic multiplier connection in Figure 1, Z1 = V

OUT

and

Z2 = 0. The quantity within the brackets then reduces to:

(X1 – X2) (Y1 – Y2)

– (V

SF

OUT

– 0) = 0

This approach leads to a simple relationship which can be
solved for V

to provide the closed-loop transfer function.

OUT

The scale factor is accurately factory adjusted to 10V and is
typically accurate to within 0.1% or less. The scale factor
may be adjusted by connecting a resistor or potentiometer
between pin SF and the –VS power supply. The value of the
external resistor can be approximated by:

5