DAC0800/DAC0802 8-Bit Digital-to-Analog Converters General Description

June 1999

DAC0800/DAC0802

8-Bit Digital-to-Analog Converters

General Description

The DAC0800 series are monolithic 8-bit high-speed current-output digital-to-analog converters (DAC) featuring typical settling times of 100 ns. When used as a multiplying

DAC, monotonic performance over a 40 to 1 reference current range is possible. The DAC0800 series also features high compliance complementary current outputs to allow differential output voltages of 20 Vp-p with simple resistor loads as shown in Figure 1. The reference-to-full-scale current matching of better than

±

1 LSB eliminates the need for full-scale trims in most applications while the nonlinearities of better than

±

0.1% over temperature minimizes system error accumulations.

The noise immune inputs of the DAC0800 series will accept

TTL levels with the logic threshold pin, V

LC

, grounded.

Changing the V

LC potential will allow direct interface to other logic families. The performance and characteristics of the device are essentially unchanged over the full

±

4.5V to

±

18V power supply range; power dissipation is only 33 mW with

±

5V supplies and is independent of the logic input states.

The DAC0800, DAC0802, DAC0800C and DAC0802C are a direct replacement for the DAC-08, DAC-08A, DAC-08C, and DAC-08H, respectively.

Features

n

Fast settling output current: 100 ns n

Full scale error:

±

1 LSB n

Nonlinearity over temperature: n

Full scale current drift:

±

0.1%

±

10 ppm/˚C n

High output compliance: −10V to +18V n

Complementary current outputs n

Interface directly with TTL, CMOS, PMOS and others n

2 quadrant wide range multiplying capability n

Wide power supply range:

±

4.5V to

±

18V n

Low power consumption: 33 mW at

±

5V n

Low cost

Typical Applications

DS005686-1

FIGURE 1.

±

20 V

P-P

Output Digital-to-Analog Converter (Note 5)

Ordering Information

Non-Linearity

±

±

±

0.1% FS

0.19% FS

0.19% FS

Temperature Order Numbers

Range

0˚C

≤

T

A

≤

+70˚C

J Package (J16A) (Note 1) N Package (N16E) (Note 1) SO Package (M16A)

0˚C

≤

T

A

−55˚C

≤

T

A

≤

+70˚C DAC0802LCJ

≤

+125˚C DAC0800LJ

DAC-08HQ DAC0802LCN

DAC-08Q

DAC-08HP

DAC0800LCJ DAC-08EQ DAC0800LCN DAC-08EP

DAC0802LCM

DAC0800LCM

Note 1: Devices may be ordered by using either order number.

© 1999 National Semiconductor Corporation DS005686 www.national.com

Absolute Maximum Ratings

(Note 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (V

+

− V

−

)

Power Dissipation (Note 3)

Reference Input Differential Voltage

(V14 to V15)

Reference Input Common-Mode

Range (V14, V15)

Reference Input Current

Logic Inputs

Analog Current Outputs

(V

S

− = −15V)

ESD Susceptibility (Note 4)

±

18V or 36V

500 mW

V

− to V

+

V

− to V

+

5 mA

V

− to V

− plus 36V

4.25 mA

TBD V

Storage Temperature

Lead Temp. (Soldering, 10 seconds)

Dual-In-Line Package (plastic)

Dual-In-Line Package (ceramic)

Surface Mount Package

Vapor Phase (60 seconds)

Infrared (15 seconds)

−65˚C to +150˚C

Operating Conditions

(Note 2)

Min Max

Temperature (T

A

)

DAC0800L

DAC0800LC

DAC0802LC

−55

0

0

+125

+70

+70

˚C

˚C

˚C

260˚C

300˚C

215˚C

220˚C

Units

Electrical Characteristics

The following specifications apply for V characteristics refer to both I

OUT

S

= and I

OUT

.

±

15V, I

REF

= 2 mA and T

MIN

≤

T

A

≤

T

MAX unless otherwise specified. Output

DAC0802LC DAC0800L/

Symbol Parameter Conditions

t s tPLH, tPHL

TCI

FS

V

OC

I

FS4

Resolution

Monotonicity

Nonlinearity

Settling Time

Propagation Delay

Each Bit

All Bits Switched

Full Scale Tempco

Output Voltage Compliance

Full Scale Current

To

±

1 ⁄

2

LSB, All Bits Switched

“ON” or “OFF”, T

A

=25˚C

DAC0800L

DAC0800LC

T

A

=25˚C

Full Scale Current Change

<

1

⁄

2

LSB, R

OUT

>

20 M

Ω

Typ

V

REF

=10.000V, R14=5.000 k

Ω

R15=5.000 k

Ω

, T

A

=25˚C

I

FS4

−I

FS2

Min

8

8

−10

1.984

Typ

8

8

100

35

35

±

10

1.992

Max

8

8

±

0.1

135

60

60

±

50

18

2.000

Min

8

8

−10

1.94

DAC0800LC

Typ

8

8

Max

8

8

±

0.19

100

100

35

35

±

10

1.99

135

150

2.04

I

FSS

I

ZS

I

FSR

Full Scale Symmetry

Zero Scale Current

Output Current Range V

−

=−5V

V

−

=−8V to −18V

0

0

±

0.5

0.1

2.0

2.0

±

4.0

1.0

2.1

4.2

0

0

±

1

0.2

2.0

2.0

60

60

±

50

18

±

8.0

2.0

2.1

4.2

Units

Bits

Bits

%FS ns ns ns ns ns ppm/˚C

V mA

µA

µA mA mA

V

IL

V

IH

I

IL

I

IH

V

IS

V

THR

I

15 dl/dt

PSSI

FS+

PSSI

FS−

Logic Input Levels

Logic “0”

Logic “1”

Logic Input Current

Logic “0”

Logic “1”

Logic Input Swing

Logic Threshold Range

Reference Bias Current

Reference Input Slew Rate

Power Supply Sensitivity

V

LC

=0V

V

LC

=0V

−10V

≤

V

IN

≤

+0.8V

2V

≤

V

IN

≤

+18V

V

−

=−15V

V

S

=

±

15V

( Figure 11 )

4.5V

≤

V

+ ≤

18V

−4.5V

≤

V

− ≤

18V

I

REF

=1mA

2.0

−10

−10

4.0

−2.0

0.002

−1.0

8.0

0.0001

0.0001

0.8

−10

10

18

13.5

−3.0

0.01

0.01

2.0

−10

−10

4.0

−2.0

0.002

−1.0

8.0

0.0001

0.0001

0.8

−10

10

18

13.5

−3.0

0.01

0.01

V

V

µA

µA

V

V

µA mA/µs

%/%

%/% www.national.com

2

Electrical Characteristics

(Continued)

The following specifications apply for V

S characteristics refer to both I

OUT and I

OUT

=

.

±

15V, I

REF

= 2 mA and T

MIN

≤

T

A

≤

T

MAX unless otherwise specified. Output

DAC0802LC

Symbol Parameter Conditions

Min Typ Max Min

DAC0800L/

DAC0800LC

Typ Max

Units

Power Supply Current V

S

= ±

5V, I

REF

=1 mA

I+

I−

2.3

−4.3

3.8

−5.8

2.3

−4.3

3.8

−5.8

mA mA

V

S

=5V, −15V, I

REF

=2 mA

I+

I−

2.4

−6.4

3.8

−7.8

2.4

−6.4

3.8

−7.8

mA mA

V

S

= ±

15V, I

REF

=2 mA

I+

I−

P

D

Power Dissipation

±

5V, I

REF

=1 mA

5V,−15V, I

REF

=2 mA

±

15V, I

REF

=2 mA

2.5

−6.5

33

108

135

3.8

−7.8

48

136

174

2.5

−6.5

33

108

135

3.8

−7.8

48

136

174 mA mA mW mW mW

Note 2: 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 3: The maximum junction temperature of the DAC0800 and DAC0802 is 125˚C. For operating at elevated temperatures, devices in the Dual-In-Line J package must be derated based on a thermal resistance of 100˚C/W, junction-to-ambient, 175˚C/W for the molded Dual-In-Line N package and 100˚C/W for the Small Outline

M package.

Note 4: Human body model, 100 pF discharged through a 1.5 k

Ω resistor.

Note 5: Pin-out numbers for the DAC080X represent the Dual-In-Line package. The Small Outline package pin-out differs from the Dual-In-Line package.

Connection Diagrams

Dual-In-Line Package

Small Outline Package

Top View

DS005686-13

See Ordering Information

Top View

DS005686-14

3 www.national.com

Block Diagram

(Note 5)

Typical Performance Characteristics

Full Scale Current vs Reference Current

LSB Propagation Delay vs I

FS

DS005686-2

Reference Input

Frequency Response

Reference Amp

Common-Mode Range

DS005686-22

Logic Input Current vs Input Voltage

DS005686-23

DS005686-24

Curve 1: C

C

=15 pF, V

Curve 2: C

C

200 mV.

=15 pF, V

IN

=2 Vp-p centered at 1V.

IN

=50 mVp-p centered at

Curve 3: C

C

=0 pF, V

14.2V applied to R14.

IN

=100 mVp-p centered at

0V and applied through 50

Ω connected to pin

V

TH

— V

LC vs Temperature

DS005686-27

DS005686-25

Note. Positive common-mode range is always

(V+) − 1.5V.

www.national.com

4

DS005686-26

Typical Performance Characteristics

(Continued)

Output Current vs Output

Voltage (Output Voltage

Compliance)

Output Voltage Compliance vs Temperature

Bit Transfer

Characteristics

Power Supply Current vs +V

DS005686-28

Power Supply Current vs −V

DS005686-29

DS005686-30

Note. B1–B8 have identical transfer characteristics. Bits are fully switched with less than

1

⁄

2

LSB error, at less than

±

100 mV from actual threshold. These switching points are guaranteed to lie between 0.8 and 2V over the operating temperature range (V

LC

= 0V).

Power Supply Current vs Temperature

Equivalent Circuit

DS005686-31

DS005686-32

DS005686-33

FIGURE 2.

5

DS005686-15 www.national.com

Typical Applications

DS005686-5

I

O

+ I

O

= I

FS for all logic states

For fixed reference, TTL operation, typical values are:

V

REF

= 10.000V

R

REF

= 5.000k

R15

≈

R

REF

C

C

= 0.01 µF

V

LC

= 0V (Ground)

FIGURE 3. Basic Positive Reference Operation (Note 5)

DS005686-21

FIGURE 4. Recommended Full Scale Adjustment

Circuit (Note 5)

DS005686-16

Note. R

REF sets I

FS

; R15 is for bias current cancellation

FIGURE 5. Basic Negative Reference Operation

(Note 5) www.national.com

DS005686-17

Full Scale

Full Scale−LSB

Half Scale+LSB

Half Scale

Half Scale−LSB

Zero Scale+LSB

Zero Scale

B1 B2 B3 B4 B5 B6 B7 B8 I

O mA

1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 0

1.992

1.984

1 0 0 0 0 0 0 1

1 0 0 0 0 0 0 0

0 1 1 1 1 1 1 1

0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0

1.008

1.000

0.992

0.008

0.000

FIGURE 6. Basic Unipolar Negative Operation (Note 5)

I

O mA

0.000

0.008

0.984

0.992

1.000

1.984

1.992

E

O

E

O

−9.960

0.000

−9.920

−0.040

−5.040

−4.920

−5.000

−4.960

−4.960

−5.000

−0.040

−9.920

0.000

−9.960

6

Typical Applications

(Continued)

DS005686-6

B1 B2 B3 B4 B5 B6 B7 B8 E

O

Pos. Full Scale

Pos. Full Scale−LSB

Zero Scale+LSB

Zero Scale

Zero Scale−LSB

Neg. Full Scale+LSB

Neg. Full Scale

FIGURE 7. Basic Bipolar Output Operation (Note 5)

E

O

1 1 1 1 1 1 1 1 −9.920 +10.000

1 1 1 1 1 1 1 0 −9.840

+9.920

1 0 0 0 0 0 0 1 −0.080

+0.160

1 0 0 0 0 0 0 0 0.000

+0.080

0 1 1 1 1 1 1 1 +0.080

0.000

0 0 0 0 0 0 0 1 +9.920

−9.840

0 0 0 0 0 0 0 0 +10.000

−9.920

DS005686-18

If R

L

= R

L within

±

0.05%, output is symmetrical about ground

Pos. Full Scale

Pos. Full Scale−LSB

(+)Zero Scale

(−)Zero Scale

Neg. Full Scale+LSB

Neg. Full Scale

B1 B2 B3 B4 B5 B6 B7 B8

1

1

1

0

0

0

1

1

0

1

0

0

1

1

0

1

0

0

1

1

0

1

0

0

1

1

0

1

0

0

1

1

0

1

0

0

1

1

0

1

0

0

1

0

0

1

1

0

E

O

+9.960

+9.880

+0.040

−0.040

−9.880

−9.960

FIGURE 8. Symmetrical Offset Binary Operation (Note 5)

DS005686-19

For complementary output (operation as negative logic DAC), connect inverting input of op amp to I

O

(pin 2), connect I

O

(pin 4) to ground.

FIGURE 9. Positive Low Impedance Output Operation (Note 5)

7 www.national.com

Typical Applications

(Continued)

DS005686-20

For complementary output (operation as a negative logic DAC) connect non-inverting input of op am to I

O

(pin 2); connect I

O

(pin 4) to ground.

FIGURE 10. Negative Low Impedance Output Operation (Note 5)

DS005686-10

Typical values: R

IN

=5k,+V

IN

=10V

FIGURE 11. Pulsed Reference Operation (Note 5)

DS005686-9

V

TH

= V

LC

+ 1.4V

15V CMOS, HTL, HNIL

V

TH

= 7.6V

Note. Do not exceed negative logic input range of DAC.

FIGURE 12. Interfacing with Various Logic Families

DS005686-12

(b) +V

REF must be above peak positive swing of V

IN

DS005686-11

(a) I

REF

≥

peak negative swing of I

IN

FIGURE 13. Accommodating Bipolar References (Note 5) www.national.com

8

Typical Applications

(Continued)

FIGURE 14. Settling Time Measurement (Note 5)

DS005686-7

DS005686-8

Note. For 1 µs conversion time with 8-bit resolution and 7-bit accuracy, an LM361 comparator replaces the LM319 and the reference current is doubled by reducing R1, R2 and R3 to 2.5 k

Ω and R4 to 2 M

Ω

.

FIGURE 15. A Complete 2 µs Conversion Time, 8-Bit A/D Converter (Note 5)

9 www.national.com

Physical Dimensions

inches (millimeters) unless otherwise noted

Molded Small Outline Package (SO)

Order Numbers DAC0800LCM, or DAC0802LCM

NS Package Number M16A

www.national.com

Molded Small Outline Package (SO)

Order Numbers DAC0800LCM, or DAC0802LCM

NS Package Number M16A

10

Physical Dimensions

inches (millimeters) unless otherwise noted (Continued)

Molded Dual-In-Line Package

Order Numbers DAC0800, DAC0802

NS Package Number N16E

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