AD7304BN AD [Analog Devices], AD7304BN Datasheet

AD7304BN

Manufacturer Part Number

AD7304BN

Description

+3 V/+5 V, Rail-to-Rail Quad, 8-Bit DAC

Manufacturer

AD [Analog Devices]

Datasheet

1.AD7304BN.pdf (14 pages)

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GENERAL DESCRIPTION

The AD7304/AD7305 are quad, 8-bit DACs that operate from a

single +3 V to +5 V supply or ±5 V supplies. The AD7304 has a

serial interface, while the AD7305 has a parallel interface. Inter-

nal precision buffers swing rail-to-rail. The reference input range

includes both supply rails allowing for positive or negative full-

scale output voltages. Operation is guaranteed over the supply

voltage range of +2.7 V to +5.5 V, consuming less than 9 mW

from a +3 V supply.

The full-scale voltage output is determined by the external refer-

ence input voltage applied. The rail-to-rail V

The AD7304’s doubled-buffered serial-data interface offers high

speed, three-wire, SPI and microcontroller compatible inputs

using data in (SDI), clock (CLK) and chip select (CS) pins.

Additionally, an internal power-on reset sets the output to zero

scale.

The parallel input AD7305 uses a standard address decode

along with the WR control line to load data into the input regis-

ters. The double buffered architecture allows all four input

registers to be preloaded with new values, followed by a LDAC

control strobe which copies all the new data into the DAC regis-

ters thereby updating the analog output values. When operating

from less than +5.5 V, the AD7305 is pin-compatible with the

popular industry standard AD7226.

*Protected under Patent Number 5684481.

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

OUT

FEATURES

Four 8-Bit DACs in One Package

+3 V, +5 V and

Rail-to-Rail REF-Input to Voltage Output Swing

2.6 MHz Reference Multiplying Bandwidth

Compact 1.1 mm Height TSSOP 16-/20-Lead Package

Internal Power ON Reset

SPI Serial Interface Compatible—AD7304

Fast Parallel Interface—AD7305

40 A Power Shutdown

APPLICATIONS

Automotive Output Span Voltage

Instrumentation, Digitally Controlled Calibration

Pin-Compatible AD7226 Replacement when V

, the negative supply V

allows for a full-scale voltage set equal the positive supply

5 V Operation

or any value in between.

REF

input to DAC

< 5.5 V

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

An internal power ON reset places both parts in the zero-scale

state at turn ON. A 40 µA power shutdown (SHDN) feature is

activated on both parts by tristating the SDI/SHDN pin on the

AD7304, and tristating the A0/SHDN address pin on the

AD7305.

The AD7304/AD7305 are specified over the extended industrial

(–40°C to +85°C), and the automotive (–40°C to +125°C)

temperature ranges. AD7304s are available in 16-lead plastic

DIP (N-16), and wide-body SOL-16 (R-16) packages. The

parallel input AD7305 is available in the 20-lead plastic DIP

(N-20), and the SOL-20 (R-20) surface mount package. For

ultracompact applications the thin 1.1 mm TSSOP-16 (RU-16)

package will be available for the AD7304, while the TSSOP-20

(RU-20) will house the AD7305.

SDI/SHDN

A0/SHDN

CLK

DB0

DB1

DB2

DB3

DB4

DB5

DB6

PWR ON

SERIAL

RESET

DECODE

FUNCTIONAL BLOCK DIAGRAMS

REG

+3 V/+5 V, Rail-to-Rail

GND

World Wide Web Site: http://www.analog.com

REG A

REG B

REG C

REG D

INPUT

REG A

INPUT

REG B

INPUT

REG C

INPUT

REG D

INPUT

AD7304/AD7305*

CLR

DAC A

DAC B

DAC C

DAC D

DAC A

DAC B

DAC C

DAC D

LDAC

REG

LDAC

Quad, 8-Bit DAC

REF

B V

C V

DAC C

DAC D

DAC B

DAC D

DAC A

DAC B

DAC A

REF

AD7304

AD7305

GND

OUT

Related parts for AD7304BN

AD7304BN Summary of contents

Page 1

FEATURES Four 8-Bit DACs in One Package + and 5 V Operation Rail-to-Rail REF-Input to Voltage Output Swing 2.6 MHz Reference Multiplying Bandwidth Compact 1.1 mm Height TSSOP 16-/20-Lead Package Internal Power ON Reset SPI Serial ...

Page 2

AD7304/AD7305–SPECIFICATIONS Parameter Symbol STATIC PERFORMANCE 1 Resolution N 2 Integral Nonlinearity INL Differential Nonlinearity DNL Zero-Scale Error V ZSE Full-Scale Voltage Error V FSE 3 Full-Scale Tempco TCV REFERENCE INPUT V Range V REFIN REFIN Input Resistance (AD7304) R REFIN ...

Page 3

... V ) and timed from a voltage level of 1 Model , 0 AD7304BN + 0 AD7304BR AD7304YR –T )/θ J MAX A JA AD7304BRU AD7305BN AD7305BR AD7305YR AD7305BRU The AD7304/AD7305 contains 2759 transistors. Die size: 103 mil × 102 mil, 10,506 sq mil +150° ...

Page 4

AD7304/AD7305 SDI SA CLK CS LDAC t LD1 SDI CLK LDAC CLR FS V OUT ZS SDI/SHDN CS LDAC CLR CLK Serial Shift Register Function Effect ↑ Data Advanced 1 Bit ↑+ ...

Page 5

WR LDAC Input Register Function REG A Loaded with DB0–DB7 ↑ REG A Latched with DB0–DB7 REG B Loaded with DB0–DB7 ↑ REG B ...

Page 6

AD7304/AD7305 Pin # Name Function Channel B rail-to-rail buffered DAC voltage output. Full scale set by reference voltage applied to V OUT is open circuit when SHDN is enabled Channel A rail-to-rail buffered DAC ...

Page 7

–5V SS 120 REF DD DATA = – mV OUT Figure 6. I SINK vs. V Rail-to-Rail Performance ...

Page 8

AD7304/AD7305 +4V REF V OUT DATA = s/DIV Figure 12. Large-Signal Settling Time V REFIN ( 5V @ 50kHz) V OUTA 2 s/DIV Figure 13. Multiplying Mode Step Response ...

Page 9

–5V SS 0.1 0.010 0.001 20 100 1k FREQUENCY – Hz Figure 18. THD vs. Frequency 3.0 2.4 1.8 1.2 0 100 1k FREQUENCY – Hz Figure 19. Output Noise ...

Page 10

AD7304/AD7305 ALL OTHER DIGITAL DIGITAL INPUT VOLTAGE – Volts Figure 24. Supply Current vs. Digital Input Voltage 10.0000 1.0000 ...

Page 11

CIRCUIT OPERATION The AD7304/AD7305 are a set of four-channel, 8-bit, voltage- output, digital-to-analog converters differing primarily in digital logic interface and number of reference inputs. Both parts share the same internal DAC design and true rail-to-rail output buff- ers. The ...

Page 12

AD7304/AD7305 REF REF CS EN AD7304 CLK D0 INPUT D1 REGISTER R SDI DACA D6 INPUT D7 REGISTER DECODE A1 D ...

Page 13

APPLICATIONS The AD7304/AD7305 is inherently a 2-quadrant multiplying D/A converter. That is, it can easily be set up for unipolar out- put operation. The full-scale output polarity is the same as the reference input voltage polarity. In some applications it ...

Page 14

AD7304/AD7305 16-Lead Wide SOIC (R-16) 0.4133 (10.50) 0.3977 (10.00 0.1043 (2.65) PIN 1 0.0118 (0.30) 0.0926 (2.35) 0.0040 (0.10) 0.0500 0.0192 (0.49) SEATING 0.0125 (0.32) (1.27) 0.0138 (0.35) PLANE BSC 0.0091 (0.23) 16-Lead Plastic DIP (N-16) ...

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