Data Sheet

AD7228

Rev. D

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FEATURES

Eight 8-bit DACs with output amplifiers

Operates with single or dual supplies

Microprocessor-compatible (95 ns WR pulse)

No user trims required

Skinny 24-lead PDIP, CERDIP, and SOIC packages, and a

28-lead PLCC surface-mount package

FUNCTIONAL BLOCK DIAGRAM

GND

LATCH 5

DAC 5

LATCH 6

DAC 6

LATCH 7

DAC 7

LATCH 8

CONTROL

LOGIC

DAC 8

8

WR

A1

A0

A2

AD7228

10

12

2

3

4

5

6

7

8

9

21

22

23

24

11

1

7

6

5

4

3

2

1

LATCH 1

DAC 1

LATCH 2

DAC 2

LATCH 3

DAC 3

LATCH 4

DAC 4

MSB

DATA

(8-BIT)

LSB

13

20

Figure 1.

GENERAL DESCRIPTION

The AD7228 contains eight 8-bit voltage mode digital-to- analog

converters (DACs), with output buffer amplifiers and interface

logic on a single monolithic chip. No external trims are required

to achieve the full specified performance for the device.

Separate on-chip latches are provided for each of the eight DACs.

Data is transferred into the data latches through a common

8-bit, TTL/CMOS-compatible input port (5 V). The A0, A1,

and A2 address inputs determine which latch is loaded

when WR goes low. The control logic is speed compatible with

most 8-bit microprocessors.

Specified performance is guaranteed for input reference voltages

from 2 V to 10 V when using dual supplies. The device is also

specified for single-supply operation using a reference of 10 V.

Each output buffer amplifier is capable of developing 10 V across a

2 kΩ load.

The AD7228 is fabricated on an all ion implanted, high speed,

developed to integrate high speed digital logic circuits and

precision analog circuits on the same chip.

PRODUCT HIGHLIGHTS

1. The single chip design of eight 8-bit DACs and amplifiers

allows a dramatic reduction in board space requirements

and offers increased reliability in systems using multiple

converters. The PDIP, CERDIP, and SOIC pinout is aimed at

optimizing board layout with all analog inputs and outputs at

one side of the package and all digital inputs at the other.

2. The voltage mode configuration of the DACs allows single

supply operation of the AD7228. The device can also be

operated with dual supplies giving enhanced performance

for some parameters.

3. The AD7228 has a common 8-bit data bus with individual

DAC latches, providing a versatile control architecture for

simple interface to microprocessors. All latch enable signals

are level triggered and speed compatible with most high

performance 8-bit microprocessors.