LTC1099ACN datasheet(11/16 Pages) LINEAR

Part #	LTC1099ACN

Description	High Speed 8-Bit A/D Converter with Built-In Sample-and-Hold

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Manufacturer	LINEAR [Linear Integrated Systems]

Direct Link	http://www.linearsystems.com

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LTC1099

11

ANALOG INTERFACE

APPLICATIONS

Analog Multiplier

The schematic Figure 9 shows the LTC1099 configured

with a DAC to form a two quadrant analog multiplier. An

input waveform is applied to the LTC1099 where it is

digitized at a 300kHz rate. The digitized signal is fed to the

DAC in “flow-through” mode where another signal is input

to the DAC reference input. In this way, the two analog

signals are multiplied to produce a double sideband ampli-

tude modulated output. Figure 10 shows a 3kHz sine wave

multiplied by a 100Hz triangle.

–

+

1

2

3

4

5

6

7

1

2

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4

5

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10

1

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N/C

CLK

3MHz

OSC

5V

OUT

74LS90

LT1019-5

÷ 10 = 300kHz

= ANALOG GROUND

= DIGITAL GROUND

15VIN

5VREF

AGND

25k

OUT

TRIM

GND

IN

LTC1099

DB0

DB1

DB2

DB3

WR/RDY

MODE

RD

INT

GND

CS

WR1

GND

DI5

DI4

DI3

DI2

DI1

DI0

VREF

RFB

VCC

WR2

XFER

DI6

DI7

DI8

DI9

DI10

DI11

IOUT2

IOUT1

DB7

DB6

DB5

DB4

CS

REF+

REF –

BYTE 1/

BYTE 2

(VIN1) 0V TO 5V

ANALOG

INPUT

(VIN2) +10V TO –10V

ANALOG

INPUT

CS AND RD LOW

4

DB0-DB3

4

DB4-DB7

88

MICROLINEAR

MP1208 DAC

12V

10

µF

4.7

µF

0.01

µF

10

µF

50k

OFFSET NULL

15V

–15V

15V

10pF

1

5

LT1056

5V

Figure 9

Note that since this is only a two quadrant multiplier, a

carrier component (the input to the LTC1099) will appear

in the output spectrum. Figure 11 shows the frequency

spectrum of a 42.5kHz sine wave multiplied by a 5kHz sine

wave. The depth of modulation is about 30dB. Figure 12

shows a 42.375kHz sine wave multiplied by a 30.875kHz

sine wave. Note that at these higher frequencies, the depth

of modulation is still about 30dB. The carrier feed-through

is seen in Figure 12.

VIN1 ≅ 0V TO 5V

TRIANGLE INTO LTC1099

~100Hz

VIN2 ≅ ±4.8V SINE

INTO DAC ~ 3kHz

1099 F10

Figure 10

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