LCZM datasheet(13/20 Pages) LINER

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LTC2641/LTC2642

26412f

APPLICATIONS INFORMATION

Bipolar Conﬁguration

Figure 3 shows a typical bipolar DAC application for the

LTC2642. The on-chip bipolar offset/gain resistors, RFB

and RINV, are connected to an external ampliﬁer to produce

a bipolar output swing from –VREF to VREF at the RFB pin.

The ampliﬁer circuit provides a gain of +2 from the VOUT

pin, and gain of –1 from VREF. Tables 2a, 2b and 2c show

the bipolar offset binary code tables for 16-bit, 14-bit and

12-bit operation.

16-BIT DAC

1/2 LT1678

–5V

5V/3V

VREF

2.5V

VDD

LTC2642-16

BIPOLAR VOUT

–2.5V TO 2.5V

4.7

μF

10pF

0.1

μF

0.1

μF

REF

VOUT

INV

RFB

GND

26412 F02

0.1

μF

0.1

μF

SCLK

DIN

CLR

LT1019CS8-2.5

GND

OUT

Table 2b. 14-Bit Bipolar Offset Binary

Code Table (LTC2642-14)

DIGITAL INPUT

BINARY NUMBER

IN DAC LATCH

ANALOG OUTPUT

(VOUT)

MSB

LSB

1111 1111 1111 11xx VREF (8,191/8,192)

1000 0000 0000 01xx VREF (1/8,192)

1000 0000 0000 00xx 0V

0111 1111 1111 11xx –VREF (1/8,192)

0000 0000 0000 00xx –VREF

Figure 3. 16-Bit Bipolar Output (LTC2642-16) VOUT = –VREF to VREF

Table 2a. 16-Bit Bipolar Offset Binary

Code Table (LTC2642-16)

DIGITAL INPUT

BINARY NUMBER

IN DAC LATCH

ANALOG OUTPUT

(VOUT)

MSB

LSB

1111 1111 1111 1111 VREF (32,767/32,768)

1000 0000 0000 0001 VREF (1/32,768)

1000 0000 0000 0000 0V

0111 1111 1111 1111 –VREF (1/32,768)

0000 0000 0000 0000 –VREF

Table 2c. 12-Bit Bipolar Offset Binary

Code Table (LTC2642-12)

DIGITAL INPUT

BINARY NUMBER

IN DAC LATCH

ANALOG OUTPUT

(VOUT)

MSB

LSB

1111 1111 1111 xxxx VREF (2,047/2,048)

1000 0000 0001 xxxx VREF (1/2,048)

1000 0000 0000 xxxx 0V

0111 1111 1111 xxxx –VREF (1/2048)

0000 0000 0000 xxxx –VREF

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