Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

716

August 31, 1994

853-0045 13721

DESCRIPTION

The DAC08 series of 8-bit monolithic multiplying Digital-to-Analog
Converters provide very high-speed performance coupled with low
cost and outstanding applications flexibility.

Advanced circuit design achieves 70ns settling times with very low
glitch and at low power consumption. Monotonic multiplying
performance is attained over a wide 20-to-1 reference current range.
Matching to within 1 LSB between reference and full-scale currents
eliminates the need for full-scale trimming in most applications.
Direct interface to all popular logic families with full noise immunity is
provided by the high swing, adjustable threshold logic inputs.

Dual complementary outputs are provided, increasing versatility and
enabling differential operation to effectively double the peak-to-peak
output swing. True high voltage compliance outputs allow direct
output voltage conversion and eliminate output op amps in many
applications.

All DAC08 series models guarantee full 8-bit monotonicity and
linearities as tight as 0.1% over the entire operating temperature
range. Device performance is essentially unchanged over the

4.5V

18V power supply range, with 37mW power consumption

attainable at

5V supplies.

The compact size and low power consumption make the DAC08
attractive for portable and military aerospace applications.

FEATURES

Fast settling output current--70ns

Full-scale current prematched to

1 LSB

Direct interface to TTL, CMOS, ECL, HTL, PMOS

Relative accuracy to 0.1% maximum over temperature range

High output compliance -10V to +18V

True and complemented outputs

Wide range multiplying capability

Low FS current drift --

10ppm/

Wide power supply range--

4.5V to

18V

Low power consumption--37mW at

APPLICATIONS

8-bit, 1

s A-to-D converters

Servo-motor and pen drivers

PIN CONFIGURATIONS

F, N Packages

Package

NOTE:
1. SO and non-standard pinouts.

VLC

B1 (MSB)

COMP

VREF

VREF+
V+

B8 (LSB)

V+

VREF+

VREF

COMPEN

VLC

B8 (LSB)

B1 (MSB)

TOP VIEW

Waveform generators

Audio encoders and attenuators

Analog meter drivers

Programmable power supplies

CRT display drivers

High-speed modems

Other applications where low cost, high speed and complete in-
put/output versatility are required

Programmable gain and attenuation

Analog-Digital multiplication

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

717

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)

-55

C to +125

DAC08F

0582B

16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)

-55

C to +125

DAC08AF

0582B

16-Pin Plastic Dual In-Line Package (DIP)

0 to +70

DAC08CN

0406C

16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)

0 to +70

DAC08CF

0582B

16-Pin Plastic Dual In-Line Package (DIP)

0 to +70

DAC08EN

0406C

16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)

0 to +70

DAC08EF

0582B

16-Pin Plastic Small Outline (SO) Package

0 to +70

DAC08ED

0005D

16-Pin Plastic Dual In-Line Package (DIP)

0 to +70

DAC08HN

0406C

BLOCK DIAGRAM

BIAS
NETWORK
CURRENT
SWITCHES

MSB

LSB

V+

COMP.

REFERENCE
AMPLIFIER

VREF(+)

VREF()

VLC

IOUT

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNIT

V+ to V-

Power supply voltage

-V

Digital input voltage

V- to V- plus 36V

Logic threshold control

V- to V+

Applied output voltage

V- to +18

Reference current

5.0

, V

Reference amplifier inputs

to V

Maximum power dissipation T

=25

(still-air)

F package

1190

N package

1450

D package

1090

SOLD

Lead soldering temperature (10sec max)

300

Operating temperature range

DAC08, DAC08A

-55 to +125

DAC08C, E, H

0 to +70

STG

Storage temperature range

-65 to +150

NOTES:
1. Derate above 25

C, at the following rates:

F package at 9.5mW/

N package at 11.6mW/

D package at 8.7mW/

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

718

DC ELECTRICAL CHARACTERISTICS

Pin 3 must be at least 3V more negative than the potential to which R

is returned. V

15V, I

REF

=2.0mA. Output characteristics refer to both

OUT

and I

OUT

unless otherwise noted. DAC08C, E, H: T

C to 70

C DAC08/08A: T

=-55

C to 125

SYMBOL

PARAMETER

TEST CONDITIONS

DAC08C

DAC08E

DAC08

UNIT

SYMBOL

PARAMETER

TEST CONDITIONS

Min

Typ

Max

Min

Typ

Max

UNIT

Resolution

Bits

Monotonicity

Bits

Relative accuracy

Over temperature range

0.39

0.19

%FS

Differential non-linearity

0.78

0.39

%FS

TCI

Full-scale tempco

ppm/

Output voltage compliance

Full-scale current change< 1/2LSB

-10

+18

-10

+18

FS4

Full-scale current

REF

=10.000V, R

, R

=5.000k

1.94

1.99

2.04

1.94

1.99

2.04

FSS

Full-scale symmetry

FS4

-I

FS2

2.0

1.0

8.0

Zero-scale current

0.2

4.0

0.2

2.0

FSR

Full-scale output current
range

, R

=5.000k

REF

=+15.0V, V-=-10V

REF

=+25.0V, V-=-12V

2.1
4.2

Logic input levels

Low
High

=0V

2.0

0.8

2.0

0.8

Logic input current

Low
High

=0V

=-10V to +0.8V

=2.0V to 18V

-2.0

0.002

-10

-2.0

0.002

-10

Logic input swing

V-=-15V

-10

+18

-10

+18

THR

Logic threshold range

15V

-10

+13.5

-10

+13.5

Reference bias current

-1.0

-3.0

-1.0

-3.0

dl/dt

Reference input slew rate

4.0

8.0

4.0

8.0

mA/

Power supply sensitivity

REF

=1mA

PSSI

FS+

Positive

V+=4.5 to 5.5V, V-=-15V;

0.0003

0.01

0.0003

0.01

V+=13.5 to 16.5V, V-=-15V

%FS/%VS

PSI

FS-

Negative

V-=-4.5 to -5.5V, V+=+15V;

0.002

0.01

0.002

0.01

V-=-13.5 to -16.5, V+=+15V

I+
I-

Power supply current

Positive
Negative

5V, I

REF

=1.0mA

3.1

-4.3

3.8

-5.8

3.1

-4.3

3.8

-5.8

I+
I-

Positive
Negative

=+5V, -15V, I

REF

=2.0mA

3.1

-7.1

3.8

-7.8

3.1

-7.1

3.8

-7.8

I+
I-

Positive
Negative

15V, I

REF

=2.0mA

3.2

-7.2

3.8

-7.8

3.2

-7.2

3.8

-7.8

Power dissipation

5V, I

REF

=1.0mA

Power dissipation

+5V, -15V, I

REF

=2.0mA

122

136

122

136

15V, I

REF

=2.0mA

156

174

156

174

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

719

DC ELECTRICAL CHARACTERISTICS

(Continued)

Pin 3 must be at least 3V more negative than the potential to which R15 is returned. V

= +15V, I

REF

= 2.0mA, Output characteristics refer to

both I

OUT

and I

OUT

, unless otherwise noted. DAC08C, E, H: T

= 0

C to 70

C. DAC08/08A: T

= -55

C to 125

SYMBOL

PARAMETER

TEST CONDITIONS

DAC08H
DAC08A

UNIT

SYMBOL

PARAMETER

TEST CONDITIONS

Min

Typ

Max

UNIT

Resolution

Bits

Monotonicity

Bits

Relative accuracy

Over temperature range

0.1

%FS

Differential non-linearity

0.19

%FS

TCI

Full-scale tempco

ppm/

Output voltage compliance

Full-scale current change 1/2LSB

-10

+18

FS4

Full-scale current

REF

=10.000V, R

, R

=5.000k

1.984

1.992

2.000

FSS

Full-scale symmetry

FS4

-I

FS2

1.0

4.0

Zero-scale current

0.2

1.0

FSR

Full-scale output current range

, R

=5.000k

REF

=+15.0V, V-=-10V

REF

=+25.0V, V-=-12V

2.1
4.2

Logic input levels

Low
High

=0V

2.0

0.8

Logic input current

Low
High

=0V

=-10V to +0.8V

=2.0V to 18V

-2.0

0.002

-10

Logic input swing

V-=-15V

-10

+18

THR

Logic threshold range

15V

-10

+13.5

Reference bias current

-1.0

-3.0

dl/dt

Reference input slew rate

4.0

8.0

mA/

Power supply sensitivity

REF

=1mA

PSSI

FS+

Positive

V+=4.5 to 5.5V, V-=-15V;

0.0003

0.01

V+=13.5 to 16.5V, V-=-15V

%FS/%VS

PSI

FS-

Negative

V-=-4.5 to -5.5V, V+=+15V;

0.002

0.01

V-=-13.5 to -16.5, V+=+15V

I+
I-

Power supply current

Positive
Negative

5V, I

REF

=1.0mA

3.1

-4.3

3.8

-5.8

I+
I-

Positive
Negative

=+5V, -15V, I

REF

=2.0mA

3.1

-7.1

3.8

-7.8

I+
I-

Positive
Negative

15V, I

REF

=2.0mA

3.2

-7.2

3.8

-7.8

Power dissipation

5V, I

REF

=1.0mA

Power dissipation

+5V, -15V, I

REF

=2.0mA

122

136

15V, I

REF

=2.0mA

156

174

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

720

AC ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

TEST CONDITIONS

DAC08C

DAC08E

DAC08

DAC08H
DAC08A

UNIT

SYMBOL

PARAMETER

TEST CONDITIONS

Min

Typ

Max

Min

Typ

Max

Min

Typ

Max

UNIT

Settling time

1/2LSB, all bits

switched on or off,

=25

135

Propagation delay

PLH

Low-to-High

=25

C, each bit.

PHL

High-to-Low

All bits switched

TEST CIRCUITS

Figure 1. Relative Accuracy Test Circuit

CONTROL

LOGIC

DAC-08

REFERENCE DAC

ACCURACY > 0.006%

NE5534

ERROR
OUTPUT

V+

5-12

VREF

RREF

R15

Figure 2. Transient Response and Settling Time

FOR SETTLING TIME
MEASUREMENT
(ALL BITS
SWITCHED LOW
TO HIGH)

USE RL to GND

FOR TURN OFF
MEASUREMENT

SETTLING TIME

TRANSIENT
RESPONSE

eIN

2.4V

0.4V

1.0V

-100mV

1.4V

RL = 500

RL = 50

PIN 4 TO GND

tS = 70ns TYPICAL

1/2 LSB

tPHL = tPLH = 10ns

tPHL

tPLH

25pF

15pF

6
7
8

1
2
4
16

DAC-08

VEE

VCC

eIN

0.1

1.0k

0.1

+2.0VDC

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

721

TEST CIRCUITS

(Continued)

Figure 3. Reference Current Slew Rate Measurement

DAC-08

VEE

VCC

0.1

OPEN

SCOPE

REQ = 200

RIN

VIN

dI
dt

SLEWING TIME

10%

90%

2.0mA

Figure 4. Notation Definitions

NOTES:
(See text for values of C.)

Typical values of R14 = R15 = 1k

VREF = +2.0V

C = 15pF

VI and II apply to inputs A1 through A8

The resistor tied to Pin 15 is to temperature compensate the bias current and may not be necessary for all applications.

)

128

)

256

where K

[

REF

and AN = `1' if AN is at High Level

AN = `0' if AN is at Low Level

DAC-08

VCC

DIGITAL
INPUTS

OUTPUT

ICC

VREF (+)

VEE

IEE

(+)

R15

R14

I15

I14

A1
A2
A3

A4
A5
A6
A7
A8

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

722

TYPICAL PERFORMANCE CHARACTERISTICS

IFS -- OUTPUT FULL SCALE CURRENT (mA)

50ns/DIVISIOM

REQ = 200

, RL = 100

, CC = 0

2.0mA

NOTES:

Curve 1:

CC = 15pF, VIN = 2.0VP-P centered at +1.0V

Curve 1:

CC = 15pF, VIN = 5m0VP-P centered at +200mV

Curve 1:

CC = 15pF, VIN = 100m0VP-P centered at 0V

and applied through 50

connected to Pin 14.

+2.0V applied to R14.

Output Current vs Output Voltage

(Output Voltage Compliance)

Fast Pulsed Reference Operation

True and Complementary Output

Operation

Full-Scale Settling Time

LSB Switching

Full-Scale Current vs

Reference Current

LSB Propagation Delay vs IFS

Reference Input Frequency Response

IREF -- REFERENCE CURRENT (mA)

5.0

4.0

3.0

2.0

1.0

2.0

3.0

4.0

5.0

I OUTPUT CURRENT (mA) FS

TA = Tmin TO Tmax

ALL BITS "HIGH"

LIMIT FOR

V=15V

LIMIT FOR
V=5V

(00000000)

(11111111)

0mA

1.0mA

IOUT

3.2

2.8

2.4

2.0

1.6

1.2

0.8

0.4

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (V)

ALL BITS ON

14 10

2 0 2

2.5V

0.5V

0.5mA

2.5mA

VIN

IOUT

200ns/division

BIT 8

LOGIC

INPUT

IOUT

2.4V

0.4V

ALL BITS SWITCHED ON

OUTPUT 1/2LSB

SETTLING +1/2LSB

2.4V

0.4V

50ns/DIVISIOM

IFS=2mA, RL=1k

1/2LSB=4

500

400

300

200

100

.05

.01

.02

.05

0.1

0.2

0.5

1.0

2.0

5.0

PROP

AGA

TION DELA

(ns)

1LSB=78nA

1LSB=7.8

RELA

TIVE OUTPUT (dB)

FREQUENCY (MHz)

10

12

14

0.1

0.2

0.5

1.0

2.0

5.0

R14=R15=1k

500

ALL BITS "ON"

VR15 = 0V

IREF = 0.2mA

IREF = 1mA

IREF = 2mA

V = 15V

V = 5V

TA = Tmin TO Tmax

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

723

TYPICAL PERFORMANCE CHARACTERISTICS

(Continued)

OUTPUT

CURRENT

(mA)

LOGIC INPUT VOLTAGE (V)

LOGIC INPUT

CURRENT

(

10,000

POWER SUPPL

CURRENT

(mA)

POWER SUPPL

CURRENT

(mA)

NOTES:

B1 through B8 have identical transfer characteristics.

Bits are fully switched, with less than 1/2LSB error, at
less than

100mV from actual threshold. These

switching points are guaranteed to lie between 0.8 and
2.0V over the operating temperature range
(VLC = 0.0V).

Reference AMP Common-Mode Range

All Bits On

Logic Input Current vs Input Voltage

 V

vs Temperature

Output Voltage Compliance

vs Temperature

Bit Transfer Characteristics

Power Supply Current vs V+

Power Supply Current vs V

Power Supply Current vs Temperature

Maximum Reference Input Frequency

vs Compensation Capacitor Value

2.0

1.8

1.6

1.4

1.2

1.o

0.8

0.6

0.4

0.2

100

150

V V (V) TH

TEMPERATURE (

4.0

8.0

V -- NEGATIVE POWER SUPPLY (VDC)

I+

BITS MAY BE HIGH OR LOW

I WITH IREF = 2mA

I WITH IREF = 1mA

I WITH IREF = 0.2mA

100

150

TEMPERATURE (

BITS MAY BE HIGH OR LOW

IREF = 2.0mA

I+

V+ = +15V

V = +15V

1,000

100

1000

CC (pF)

F (kHz) MAX

8.0

6.0

4.0

2.0

LOGIC INPUT VOLTAGE (V)

1.4

3.2

2.8

2.4

2.0

1.6

1.2

0.8

0.4

14 10

2 0 2

V15 -- REFERENCE COMMON MODE VOLTAGE (V)

POSITIVE COMMON-MODE RANGE IS ALWAYS (V+) 1.5V.

IREF = 2mA

TA = TMIN to TMAX

IREF = 1mA

IREF = 0.2mA

V = 15V

V = 5V

V+ = +5V

POWER SUPPL

CURRENT

(mA)

100

150

V+ POSITIVE POWER SUPPLY (V

)

ALL BITS HIGH OR LOW

I+

1.2

1.0

0.8

0.6

0.4

0.2

OUTPUT

CURRENT

(mA)

IREF = 2.0mA

V = 15V

V = 5V

Shaded area indicates

permissible output voltage

range for V = -15V, IREF

2.0mA

For other V or IREF

See "Output Current vs Output

Voltage" curve on previous page

TEMPERATURE (

100

150

OUTPUT

VOL

AGE (V)

Philips Semiconductors Linear Products

Product specification

DAC08 Series

8-Bit high-speed multiplying D/A converter

August 31, 1994

724

TYPICAL APPLICATION

NOTES:

REQ = RIN || RP

Typical Values

RIN = 5k

+VIN = 10V

Pulsed Referenced Operation

OPTIONAL RESISTOR
FOR OFFSET
INPUTS

NO CAP

15 16

+VREF

RREF

REQ
=200

RIN

FUNCTIONAL DESCRIPTION

Reference Amplifier Drive and Compensation

The reference amplifier input current must always flow into Pin 14
regardless of the setup method or reference supply voltage polarity.

Connections for a positive reference voltage are shown in Figure 1.
The reference voltage source supplies the full reference current. For
bipolar reference signals, as in the multiplying mode, R

can be

tied to a negative voltage corresponding to the minimum input level.
R

may be eliminated with only a small sacrifice in accuracy and

temperature drift.

The compensation capacitor value must be increased as R

value

is increased. This is in order to maintain proper phase margin. For
R

values of 1.0, 2.5, and 5.0k

, minimum capacitor values are 15,

37, and 75pF, respectively. The capacitor may be tied to either V

or ground, but using V

increases negative supply rejection.

(Fluctuations in the negative supply have more effect on accuracy
than do any changes in the positive supply.)

A negative reference voltage may be used if R

is grounded and

the reference voltage is applied to R

as shown. A high input

impedance is the main advantage of this method. The negative
reference voltage must be at least 3.0V above the V

supply.

Bipolar input signals may be handled by connecting R

to a positive

reference voltage equal to the peak positive input level at Pin 15.

When using a DC reference voltage, capacitive bypass to ground is
recommended. The 5.0V logic supply is not recommended as a
reference voltage, but if a well regulated 5.0V supply which drives
logic is to be used as the reference, R

should be formed of two

series resistors with the junction of the two resistors bypassed with
0.1

F to ground. For reference voltages greater than 5.0V, a clamp

diode is recommended between Pin 14 and ground.

If Pin 14 is driven by a high impedance such as a transistor current
source, none of the above compensation methods applies and the
amplifier must be heavily compensated, decreasing the overall
bandwidth.

Output Voltage Range

The voltage at Pin 4 must always be at least 4.5V more positive than
the voltage of the negative supply (Pin 3) when the reference current

is 2mA or less, and at least 8V more positive than the negative
supply when the reference current is between 2mA and 4mA. This is
necessary to avoid saturation of the output transistors, which would
cause serious accuracy degradation.

Output Current Range

Any time the full-scale current exceeds 2mA, the negative supply
must be at least 8V more negative than the output voltage. This is
due to the increased internal voltage drops between the negative
supply and the outputs with higher reference currents.

Accuracy

Absolute accuracy is the measure of each output current level with
respect to its intended value, and is dependent upon relative
accuracy, full-scale accuracy and full-scale current drift. Relative
accuracy is the measure of each output current level as a fraction of
the full-scale current after zero-scale current has been nulled out.
The relative accuracy of the DAC08 series is essentially constant
over the operating temperature range due to the excellent
temperature tracking of the monolithic resistor ladder. The reference
current may drift with temperature, causing a change in the absolute
accuracy of output current. However, the DAC08 series has a very
low full-scale current drift over the operating temperature range.

The DAC08 series is guaranteed accurate to within

LSB at +25

at a full-scale output current of 1.992mA. The relative accuracy test
circuit is shown in Figure 1. The 12-bit converter is calibrated to a
full-scale output current of 1.99219mA, then the DAC08 full-scale
current is trimmed to the same value with R

so that a zero value

appears at the error amplifier output. The counter is activated and
the error band may be displayed on the oscilloscope, detected by
comparators, or stored in a peak detector.

Two 8-bit D-to-A converters may not be used to construct a 16-bit
accurate D-to-A converter. 16-bit accuracy implies a total of

part in

65,536, or

0.00076%, which is much more accurate than the

0.19% specification of the DAC08 series.

Monotonicity

A monotonic converter is one which always provides analog output
greater than or equal to the preceding value for a corresponding
increment in the digital input code. The DAC08 series is monotonic
for all values of reference current above 0.5mA. The recommended
range for operation is a DC reference current between 0.5mA and
4.0mA.

Settling Time

The worst-case switching condition occurs when all bits are
switched on, which corresponds to a low-to-high transition for all
input bits. This time is typically 70ns for settling to within LSB for
8-bit accuracy. This time applies when R

<500

and C

<25pF. The

slowest single switch is the least significant bit, which typically turns
on and settles in 65ns. In applications where the DAC functions in a
positive-going ramp mode, the worst-case condition does not occur
and settling times less than 70ns may be realized.

Extra care must be taken in board layout since this usually is the
dominant factor in satisfactory test results when measuring settling
time. Short leads, 100

F supply bypassing for low frequencies,

minimum scope lead length, and avoidance of ground loops are all
mandatory.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: DAC08EF

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: DAC08EF