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DAC0830/DAC0832

8-Bit µP Compatible, Double-Buffered D to A Converters

General Description

The DAC0830 is an advanced CMOS/Si-Cr 8-bit multiplying

DAC designed to interface directly with the 8080, 8048,

8085, Z80

, and other popular microprocessors. A deposited

silicon-chromium R-2R resistor ladder network divides the

reference current and provides the circuit with excellent

temperature tracking characteristics (0.05% of Full Scale

Range maximum linearity error over temperature). The cir-

cuit uses CMOS current switches and control logic to

achieve low power consumption and low output leakage

current errors. Special circuitry provides TTL logic input volt-

age level compatibility.

Double buffering allows these DACs to output a voltage

corresponding to one digital word while holding the next

digital word. This permits the simultaneous updating of any

number of DACs.

The DAC0830 series are the 8-bit members of a family of

microprocessor-compatible DACs (MICRO-DAC

™

Features

n Double-buffered, single-buffered or flow-through digital

data inputs

n Easy interchange and pin-compatible with 12-bit

DAC1230 series

n Direct interface to all popular microprocessors

n Linearity specified with zero and full scale adjust

only—NOT BEST STRAIGHT LINE FIT.

n Works with

10V reference-full 4-quadrant multiplication

n Can be used in the voltage switching mode

n Logic inputs which meet TTL voltage level specs (1.4V

logic threshold)

n Operates “STAND ALONE” (without µP) if desired

n Available in 20-pin small-outline or molded chip carrier

package

Key Specifications

n Current settling time: 1 µs

n Resolution: 8 bits

n Linearity: 8, 9, or 10 bits (guaranteed over temp.)

n Gain Tempco: 0.0002% FS/˚C

n Low power dissipation: 20 mW

n Single power supply: 5 to 15 V

Typical Application

00560801

BI-FET

™

and MICRO-DAC

™

are trademarks of National Semiconductor Corporation.

Z80

is a registered trademark of Zilog Corporation.

March 2002

DAC0830/DAC0832 8-Bit µP Compatible, Double-Buffered D to A Converters

Absolute Maximum Ratings (Notes 1,

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (V

)17V

Voltage at Any Digital Input V

to GND

Voltage at V

REF

Input

25V

Storage Temperature Range −65˚C to +150˚C

Package Dissipation

at T

=25˚C (Note 3) 500 mW

DC Voltage Applied to

OUT1

or I

OUT2

(Note 4) −100 mV to V

ESD Susceptability (Note 4) 800V

Lead Temperature (Soldering, 10 sec.)

Dual-In-Line Package (plastic) 260˚C

Dual-In-Line Package (ceramic) 300˚C

Surface Mount Package

Vapor Phase (60 sec.) 215˚C

Infrared (15 sec.) 220˚C

Operating Conditions

Temperature Range T

MIN

≤T

MAX

Part numbers with “LCN” suffix 0˚C to +70˚C

Part numbers with “LCWM” suffix 0˚C to +70˚C

Part numbers with “LCV” suffix 0˚C to +70˚C

Part numbers with “LCJ” suffix −40˚C to +85˚C

Part numbers with “LJ” suffix −55˚C to +125˚C

Voltage at Any Digital Input V

to GND

Electrical Characteristics

REF

=10.000 V

unless otherwise noted. Boldface limits apply over temperature, T

MIN

≤T

MAX

. For all other limits

=25˚C.

Parameter Conditions

See

Note

= 4.75 V

= 15.75 V

=5V

=12V

to 15 V

Limit

Units

Typ

(Note 12)

Tested

Limit

(Note 5)

Design

Limit

(Note 6)

CONVERTER CHARACTERISTICS

Resolution 8 8 8 bits

Linearity Error Max Zero and full scale adjusted 4, 8

−10V≤V

REF

≤+10V

DAC0830LJ & LCJ 0.05 0.05 % FSR

DAC0832LJ & LCJ 0.2 0.2 % FSR

DAC0830LCN, LCWM &

LCV

0.05 0.05 % FSR

DAC0831LCN 0.1 0.1 % FSR

DAC0832LCN, LCWM &

LCV

0.2 0.2 % FSR

Differential Nonlinearity Zero and full scale adjusted 4, 8

Max −10V≤V

REF

≤+10V

DAC0830LJ & LCJ 0.1 0.1 % FSR

DAC0832LJ & LCJ 0.4 0.4 % FSR

DAC0830LCN, LCWM &

LCV

0.1 0.1 % FSR

DAC0831LCN 0.2 0.2 % FSR

DAC0832LCN, LCWM &

LCV

0.4 0.4 % FSR

Monotonicity −10V≤V

REF

LJ & LCJ 4 88bits

≤+10V LCN, LCWM &

LCV

8 8 bits

Gain Error Max Using Internal R

0.2

1 %FS

−10V≤V

REF

≤+10V

Gain Error Tempco Max Using internal R

0.0002 0.0006 %

DAC0830/DAC0832

www.national.com3

Electrical Characteristics

REF

=10.000 V

unless otherwise noted. Boldface limits apply over temperature, T

MIN

≤T

MAX

. For all other limits

=25˚C.

Symbol Parameter Conditions

See

Note

=15.75 V

=12

5% to 15

=4.75 V

Limit

Units

Typ

(Note 12)

Tested

Limit

(Note 5)

Design Limit

(Note 6)

Typ

(Note 12)

Tested

Limit

(Note 5)

Design

Limit

(Note 6)

AC CHARACTERISTICS

Current Setting V

=0V,

=5V

1.0 1.0 µs

Time

Write and XFER V

=0V,

=5V

11 100 250 375 600

Pulse Width Min 9 320 320 900 900

Data Setup Time V

=0V,

=5V

100 250 375 600

Min 320 320 900 900

Data Hold Time V

=0V,

=5V

30 50

Min 30 50

Control Setup

Time

=0V,

=5V

110 250 600 900

Min 320 320 1100 1100

Control Hold Time V

=0V,

=5V

10 0

Min 00

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating

the device beyond its specified operating conditions.

Note 2: All voltages are measured with respect to GND, unless otherwise specified.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by T

JMAX

, θ

, and the ambient temperature, T

. The maximum

allowable power dissipation at any temperature is P

=(T

JMAX

−T

)/θ

or the number given in the Absolute Maximum Ratings, whichever is lower. For this device,

JMAX

= 125˚C (plastic) or 150˚C (ceramic), and the typical junction-to-ambient thermal resistance of the J package when board mounted is 80˚C/W. For the N

package, this number increases to 100˚C/W and for the V package this number is 120˚C/W.

Note 4: For current switching applications, both I

OUT1

and I

OUT2

must go to ground or the “Virtual Ground” of an operational amplifier. The linearity error is degraded

by approximately V

÷V

REF

. For example, if V

REF

=10Vthena1mVoffset, V

,onI

OUT1

or I

OUT2

will introduce an additional 0.01% linearity error.

Note 5: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 6: Guaranteed, but not 100% production tested. These limits are not used to calculate outgoing quality levels.

Note 7: Guaranteed at V

REF

10 V

and V

REF

Note 8: The unit “FSR” stands for “Full Scale Range.” “Linearity Error” and “Power Supply Rejection” specs are based on this unit to eliminate dependence on a

particular V

REF

value and to indicate the true performance of the part. The “Linearity Error” specification of the DAC0830 is “0.05% of FSR (MAX)”. This guarantees

that after performing a zero and full scale adjustment (see Sections 2.5 and 2.6), the plot of the 256 analog voltage outputs will each be within 0.05%xV

REF

of a

straight line which passes through zero and full scale.