ad7305bnz Analog Devices, Inc., ad7305bnz Datasheet

ad7305bnz

Manufacturer Part Number

ad7305bnz

Description

3 V/5 V, Rail-to-rail Quad, 8-bit Dac

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD7305BNZ.pdf (20 pages)

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FEATURES

Four 8-bit DACs in one package

+3 V, +5 V, and ±5 V operation

Rail-to-rail REF input to voltage output swing

2.6 MHz reference multiplying bandwidth

Internal power-on reset

SPI serial interface-compatible—AD7304

Fast parallel interface—AD7305

40 µA power shutdown

APPLICATIONS

Automotive output span voltage

Instrumentation, digitally controlled calibration

Pin-compatible AD7226 replacement when V

GENERAL DESCRIPTION

The AD7304/AD7305

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.

Internal 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

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

DAC V

supply, V

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

speed, 3-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

registers.

The double-buffered architecture allows all four input registers

to be preloaded with new values, followed by an LDAC control

strobe that copies all the new data into the DAC registers,

thereby updating the analog output values.

_____________________________________________________

Rev. C

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

Protected under Patent No. 5684481.

OUT

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

, the negative supply, V

are quad, 8-bit DACs that operate from

, or any value in between.

REF

< 5.5 V

input to

When operating from less than 5.5 V, the AD7305 is

pin-compatible with the popular industry-standard AD7226.

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 three-stating the SDI/SHDN pin on

the AD7304 and three-stating 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 a wide-body

16-lead SOIC (R-16) package. The parallel input AD7305 is

available in the wide-body 20-lead SOIC (R-20) surface-mount

package. For ultracompact applications, the thin 1.1 mm,

16-lead TSSOP (RU-16) package is available for the AD7304,

while the 20-lead TSSOP (RU-20) houses the AD7305.

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

Tel: 781.329.4700

Fax: 781.326.8703

SDI/SHDN

A0/SHDN

DB0

DB1

DB2

DB3

DB4

DB5

DB6

CLK

FUNCTIONAL BLOCK DIAGRAMS

PWR-ON

DECODE

RESET

SERIAL

RESET

REG

GND

REG B

REG C

REG D

REG A

INPUT

REG B

REG A

INPUT

REG C

INPUT

REG D

INPUT

3 V/5 V, Rail-to-Rail

CLR

Figure 1.

Figure 2.

AD7304/AD7305

DAC B

DAC A

DAC C

DAC D

DAC B

DAC C

DAC D

DAC A

LDAC

Quad, 8-Bit DAC

REG

LDAC

REF

B V

C V

DAC B

DAC D

DAC A

DAC C

DAC D

DAC A

DAC B

DAC C

REF

www.analog.com

AD7305

AD7304

GND

OUT

Related parts for ad7305bnz

ad7305bnz Summary of contents

Page 1

... REG B REG 8 8 INPUT DAC C DAC C REG C REG INPUT DAC D DAC D REG D REG AD7305 V GND LDAC SS Figure 2. www.analog.com © 2004 Analog Devices, Inc. All rights reserved OUT V B OUT V C OUT V D OUT V A OUT V B OUT V C OUT V D ...

Page 2

AD7304/AD7305 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing Specifications .................................................................. 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 8 Typical Performance Characteristics ........................................... 10 Circuit Operation ........................................................................... 14 DAC Section................................................................................ 14 AD7304 Serial Data Interface ...

Page 3

SPECIFICATIONS @ and Table 1. Parameter Symbol STATIC PERFORMANCE 1 Resolution N 2 Integral Nonlinearity INL Differential Nonlinearity DNL Zero-Scale ...

Page 4

AD7304/AD7305 TIMING SPECIFICATIONS @ and Table 2. Parameter 1, 2 INTERFACE TIMING SPECIFICATIONS AD7304 Only Clock Width High Clock Width ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 3. Parameter V to GND GND GND REFX Logic Inputs to GND V to GND OUTX I Short-Circuit to GND OUT Package Power Dissipation Thermal Resistance θ JA 16-Lead SOIC ...

Page 6

AD7304/AD7305 SA SDI CLK CS LDAC t LD1 SDI CLK LDAC CLR FS V OUT ZS SDI/SHDN Table 4. AD7304 Control Logic Truth Table 1 CS CLK LDAC CLR 1 Serial Shift Register Function ...

Page 7

Table 6. AD7305 Control Logic Truth Table LDAC Input Register Function Register A loaded with DB0 to DB7 ↑ Register A latched with DB0 to DB7 L L ...

Page 8

AD7304/AD7305 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Table 7. AD7304 Pin Function Descriptions Pin No. Mnemonic Description Channel B Rail-to-Rail Buffered DAC Voltage Output. Full-scale set by reference voltage applied to V OUT Output is open circuit when ...

Page 9

Table 8. AD7305 Pin Function Description Pin No. Mnemonic Description Channel B Rail-to-Rail Buffered DAC Voltage Output. Full-scale set by reference voltage applied to V OUT open circuit when SHDN is enabled Channel A ...

Page 10

AD7304/AD7305 TYPICAL PERFORMANCE CHARACTERISTICS 144 –5V SS 120 REF DD DATA = 0x00 (mV) OUT Figure 10. I Sink vs. V ...

Page 11

REF V OUT DATA = 0x00 0xFF CS 2µs/DIV Figure 16. Large-Signal Settling Time V REFIN (±5V @ 50kHz OUT 2µs/DIV Figure 17. Multiplying Mode Step Response and Output Slew Rate ...

Page 12

AD7304/AD7305 + –5V SS 0.1 0.01 0.001 20 100 1k FREQUENCY (Hz) Figure 22. THD vs. Frequency 3.0 2.4 1.8 1.2 0 100 1k FREQUENCY (Hz) Figure 23. Output Noise Voltage ...

Page 13

– +2.5V REF A0 = +5V ALL OTHER DIGITAL PINS VARYING DIGITAL INPUT VOLTAGE (V) Figure ...

Page 14

AD7304/AD7305 CIRCUIT OPERATION The AD7304/AD7305 are 4-channel, 8-bit, voltage output DACs, 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 buffers. The AD7304 contains four independent ...

Page 15

AD7304 SERIAL DATA INTERFACE The AD7304 uses a 3-wire ( CS , SDI, CLK) SPI-compatible serial data interface. New serial data is clocked into the serial input register in a 12-bit data-word format. MSB bits are loaded first. Table 5 ...

Page 16

AD7304/AD7305 AD7305 PARALLEL DATA INTERFACE The AD7305 has an 8-bit parallel interface DB7 = MSB, DB0 = LSB. Two address bits, A1 and A0, are decoded when an active low write strobe is placed on the WR pin, see Table ...

Page 17

APPLICATIONS The AD7304/AD7305 are inherently 2-quadrant multiplying DACs. That is, they can easily be set up for unipolar output operation. The full-scale output polarity is the same as the reference input voltage polarity. In some applications, it may be necessary ...

Page 18

AD7304/AD7305 OUTLINE DIMENSIONS 10.50 (0.4134) 10.10 (0.3976 7.60 (0.2992) 7.40 (0.2913) 10.65 (0.4193 10.00 (0.3937) 1.27 (0.0500) 2.65 (0.1043) BSC 2.35 (0.0925) 0.30 (0.0118) 0.10 (0.0039) 0.51 (0.0201) SEATING COPLANARITY 0.33 (0.0130) PLANE 0.10 0.31 (0.0122) ...

Page 19

ORDERING GUIDE Model Temperature Range AD7304BR –40°C to +85°C AD7304BR-REEL –40°C to +85°C 1 AD7304BRZ –40°C to +85°C 1 AD7304BRZ-REEL –40°C to +85°C AD7304YR –40°C to +125°C 1 AD7304YRZ –40°C to +125°C AD7304BRU –40°C to +85°C AD7304BRU-REEL7 –40°C to +85°C ...

Page 20

... AD7304/AD7305 NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. Printed in the U.S.A. C01114-0-11/04(C) Rev Page ...

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