BURR-BROWN DAC7621 User Manual

®

For most current data sheet and other product

information, visit www.burr-brown.com

12-Bit, Parallel Input

DIGITAL-TO-ANALOG CONVERTER

DAC7621

®

DAC7621

FEATURES

● LOW POWER: 2.5mW

● FAST SETTLING: 7µs to 1 LSB

● 1mV LSB WITH 4.095V FULL-SCALE

RANGE

● COMPLETE WITH REFERENCE

● 12-BIT LINEARITY AND MONOTONICITY

OVER INDUSTRIAL TEMP RANGE

● ASYNCHRONOUS RESET TO 0V

APPLICATIONS

● PROCESS CONTROL

● DATA ACQUISITION SYSTEMS

● CLOSED-LOOP SERVO-CONTROL

● PC PERIPHERALS

● PORTABLE INSTRUMENTATION

DESCRIPTION

The DAC7621 is a 12-bit digital-to-analog converter
(DAC) with guaranteed 12-bit monotonicity perfor­mance over the industrial temperature range. It re­quires a single +5V supply and contains an input
register, latch, 2.435V reference, DAC, and high speed
rail-to-rail output amplifier. For a full-scale step, the
output will settle to 1 LSB within 7µs. The device
consumes 2.5mW (0.5mA at 5V).

The parallel interface is compatible with a wide variety
of microcontrollers. The DAC7621 accepts a 12-bit
parallel word, has a double-buffered input logic struc­ture and provides data readback. In addition, two
control pins provide a chip select (CS) function and
asynchronous clear (CLR) input. The CLR input can
be used to ensure that the DAC7621 output is 0V on
power-up or as required by the application.

The DAC7621 is available in a 20-lead SSOP package
and is fully specified over the industrial temperature
range of –40°C to +85°C.

V

DD

SBAS107

Ref

CLR

LOADDAC

CS

R/W

D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone]

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

© 1998 Burr-Brown Corporation PDS-1502B Printed in U.S.A. March, 1999

12-Bit DAC

12

DAC Register

12

Input Register

12

I/O Buffer

DGND

DAC7621

V

OUT

SPECIFICATIONS

ELECTRICAL

At TA = –40°C to +85°C, and VDD = +5V, unless otherwise noted.

DAC7621E DAC7621EB

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 12 ✻ Bits

ACCURACY

Relative Accuracy
Differential Nonlinearity Guaranteed Monotonic –1 ±1/2 +1 –1 ±1/4 +1 LSB
Zero-Scale Error Code 000
Full Scale Voltage Code FFF

ANALOG OUTPUT

Output Current Code 800
Load Regulation R
Capacitive Load No Oscillation 500 ✻ pF
Short-Circuit Current ±20 ✻ mA
Short-Circuit Duration GND or V

DIGITAL INPUT

Data Format Parallel ✻
Data Coding Straight Binary ✻
Logic Family CMOS ✻
Logic Levels

V

IH

V

IL

I

IH

I

IL

DYNAMIC PERFORMANCE

Settling Time
DAC Glitch 5 ✻ nV-s
Digital Feedthrough 2 ✻ nV-s

POWER SUPPLY

V

DD

I

DD

Power Dissipation V
Power Supply Sensitivity ∆V

TEMPERATURE RANGE

Specified Performance –40 +85 ✻✻°C

(1)

H
H

≥ 402Ω, Code 800

LOAD

H

H

DD

–2 ±1/2 +2 –1 ±1/4 +1 LSB

–1 +1 +3 ✻✻✻ LSB

4.079 4.095 4.111 4.087 4.095 4.103 V

±5 ±7 ✻✻ mA

13 ✻✻ LSB

Indefinite ✻

0.7 • V

DD

0.3 • V

±10 ✻ µA

✻ V

DD

✻ V

±10 ✻ µA

(2)

(tS) To ±1 LSB of Final Value 7 ✻ µs

+4.75 +5.0 +5.25 ✻✻✻ V

VIH = 5V, VIL = 0V, No Load, at Code 000

= 5V, VIL = 0V, No Load 2.5 5 ✻✻ mW

IH

= ±5% 0.001 0.004 ✻✻%/%

DD

H

0.5 1 ✻✻ mA

✻ Same specification as for DAC7621E.
NOTES: (1) This term is sometimes referred to as Linearity Error or Integral Nonlinearity (INL). (2) Specification does not apply to negative-going transitions where

the final output voltage will be within 3 LSBs of ground. In this region, settling time may be double the value indicated.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

®

DAC7621

2

PIN CONFIGURATION

PIN DESCRIPTIONS

Top View SSOP

CLR

V

V

OUT

AGND
DGND

DB11 (MSB)

DB10

DB9
DB8
DB7

1
2

DD

3
4
5

DAC7621E

6
7
8
9

10

20
19
18
17
16
15
14
13
12
11

LOADDAC
CS
R/W
DB0 (LSB)
DB1
DB2
DB3
DB4
DB5
DB6

PIN LABEL DESCRIPTION

1 CLR Reset. Resets the DAC register to zero. Active

2V
3V
4 AGND Analog Ground
5 DGND Digital Ground
6 DB11 Data Bit 11, MSB
7 DB10 Data Bit 10
8 DB9 Data Bit 9
9 DB8 Data Bit 8
10 DB7 Data Bit 7
11 DB6 Data Bit 6
12 DB5 Data Bit 5
13 DB4 Data Bit 4
14 DB3 Data Bit 3
15 DB2 Data Bit 2
16 DB1 Data Bit 1
17 DB0 Data Bit 0, LSB
18 R/W Read and Write Control
19 CS Chip Select. Active LOW.
20 LOADDAC Loads the internal DAC register. The DAC register

LOW. Asynchronous input.
Postive Power Supply

DD

DAC Output Voltage

OUT

is a transparent latch and is transparent when
LOADDAC is LOW (regardless of the state of CS or
CLK).

ABSOLUTE MAXIMUM RATINGS

VDD to GND .......................................................................... –0.3V to 6V

Digital Inputs to GND .............................................. –0.3V to V

to GND ........................................................... –0.3V to VDD + 0.3V

V

OUT

Power Dissipation ........................................................................ 325mW

Thermal Resistance,

Maximum Junction Temperature.................................................. +150°C

Operating Temperature Range ...................................... –40°C to +85°C

Storage Temperature Range ....................................... –65°C to +150°C

Lead Temperature (soldering, 10s) .............................................. +300°C

NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.

θ

........................................................... 150°C/W

JA

(1)

+ 0.3V

DD

ELECTROSTA TIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degrada­tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.

PACKAGE/ORDERING INFORMATION

MINIMUM

RELATIVE DIFFERENTIAL SPECIFICATION PACKAGE

PRODUCT (LSB) (LSB) RANGE PACKAGE NUMBER

ACCURACY NONLINEARITY TEMPERATURE DRAWING ORDERING TRANSPORT

DAC7621E ±2 ±1 –40°C to +85°C 20-Lead SSOP 334 DAC7621E Rails

"" " " ""DAC7621E/1K Tape and Reel

DAC7621EB ±1 ±1 –40°C to +85°C 20-Lead SSOP 334 DAC7621EB Rails

"" " " ""DAC7621EB/1K Tape and Reel

NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are
available only in Tape and Reel in the quantities indicated (e.g., /1K indicates 1000 devices per reel). Ordering 1000 pieces of “DAC7621E/1K” will get a single
1000-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.

(1)

NUMBER

(2)

MEDIA

3 DAC7621

®

TIMING DIAGRAMS

CS

t

RDS

R/W

Data Out

t

RCS

Data Valid

t

CSD

t

t

RDH

DZ

CS

R/W

LOADDAC

Data In

t

WCS

t

WS

t

DS

t

WH

t

LWD

t

DH

Data Output Timing

TIMING SPECIFICATIONS

TA = –40°C to +85°C

SYMBOL

t

RCS

t

RDS

t

RDH

t

DZ

t

CSD

t

WCS

t

WS

t

WH

t

DS

t

DH

t

LWD

DESCRIPTION MIN TYP MAX UNITS

CS LOW for Read 200 ns

R/W HIGH to CS LOW 10 ns

R/W HIGH after CS HIGH 0 ns

CS HIGH to Data Bus 100 ns

in High Impedance

CS LOW to Data Bus Valid 100 160 ns

CS LOW for Write 50

R/W LOW to CS LOW 0 ns

R/W LOW after CS HIGH 5 ns

Data Valid to CS LOW 0 ns

Data Valid after CS HIGH 5 ns

LOADDAC LOW 50 ns

Digital Input Timing

LOGIC TRUTH TABLE

INPUT DAC

R/W CS LOADDAC REGISTER REGISTER MODE

L L L Write Write Write

L L H Write Hold Write Input
H L H Read Hold Read Input
X H L Hold Update Update
X H H Hold Hold Hold

X = Don’t Care.

®

DAC7621

4