AD7839

–12–

REV. 0

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

44-Lead MQFP (S-44)

0.548 (13.925)

0.546 (13.875)

TOP VIEW

(PINS DOWN)

1

33

34

44

11

12

23

22

0.033 (0.84)

0.029 (0.74)

0.398 (10.11)

0.390 (9.91)

0.016 (0.41)

0.012 (0.30)

0.083 (2.11)

0.077 (1.96)

0.040 (1.02)

0.032 (0.81)

0.040 (1.02)

0.032 (0.81)

SEATING

PLANE

0.096 (2.44)

MAX

0.037 (0.94)

0.025 (0.64)

8°

0.8°

GND

8/10-BIT

DAC

GND

8/10-BIT

DAC

LOGIC LEVEL

SHIFT

+5V

5V

SCLK

D IN

FSIN/CS

SCLK

D IN

FSIN/CS

0V TO +5V

0V TO

5V

A0, A1, A2

AD7839*

GND

DATA BUS

ADDR

DECODER

ADDR BUS

SDATA

SCLK

DATA BUS

CONTROLLER

*ADDITIONAL PINS OMITTED FOR CLARITY

Figure 22. Programmable Reference Generation for the AD7839

these DACs can be operated with supplies of 0 V and –5 V, with

–5 V. Now these can be used to provide the negative reference

digital signals driving the DACs need to be level-shifted from

the 0 V to +5 V range to the –5 V to 0 V range. Figure 22 shows

a typical application circuit to provide programmable reference

capabilities for the AD7839.