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DEVICE INFORMATION

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

GND

DB11 (MSB)

DB10

DB9

DB8

DB7

DB6

DB5

DB0 (LSB)

DB1

DB2

DB3

DB4

DAC7821

TSSOP-20

I

1

OUT

R

FB

V

REF

V

DD

I

2

OUT

R/W

CS

QFN-20

(1)

GND

DB11

DB10

DB9

DB8

DB0

DB1

DB2

DAC7821

1

2

3

4

5

15

14

13

12

11

R/W

CS

DAC7821

SBAS365A – OCTOBER 2005 – REVISED FEBRUARY 2006

(1)

QFN-20 package available 2Q 2006.

TERMINAL FUNCTIONS

TERMINAL

TSSOP

QFN

NO.

NO.

NAME

DESCRIPTION

1

19

DAC current output.

2

20

DAC analog ground. This pin is normally tied to the analog ground of the system.

3

1

GND

Ground pin.

4–15

2–13

DB11 – DB0

Parallel data bits 11 to 0.

Chip select input. Active low. Used in conjunction with R/W to load parallel data to the input

16

14

CS

latch or read data from the DAC register. Rising edge of CS loads data.

Read/Write. When low, use in conjunction with CS to load parallel data. When high, use with

17

15

R/W

CS to read back contents of DAC register.

18

16

Positive power supply input. These parts can be operated from a supply of 2.5 V to 5.5 V.

19

17

DAC reference voltage input.

DAC feedback resistor pin. Establish voltage output for the DAC by connecting to external

20

18

amplifier output.

5