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DAC-08CN [NXP]

8-Bit high-speed multiplying D/A converter; 8位高速乘法D / A转换器
DAC-08CN
型号： DAC-08CN
厂家： NXP    NXP
描述：

8-Bit high-speed multiplying D/A converter
8位高速乘法D / A转换器

转换器 数模转换器 光电二极管
文件： 总12页 (文件大小：231K)
中文：  中文翻译
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Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
DESCRIPTION  
PIN CONFIGURATIONS  
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.  
F, N Packages  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
COMP  
V
LC  
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.  
I
V
O
REF–  
V–  
V
REF+  
V+  
I
O
B
(MSB)  
B
B
B
(LSB)  
1
8
7
6
5
2
B
B
B
B
3
4
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.  
TOP VIEW  
1
D Package  
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  
to ±18V power supply range, with 37mW power consumption  
attainable at ±5V supplies.  
1
2
3
4
5
6
7
8
V+  
16  
B
(LSB)  
8
15  
14  
13  
12  
11  
10  
9
B
V
V
7
REF+  
B
B
6
5
4
REF–  
COMPEN  
The compact size and low power consumption make the DAC08  
attractive for portable and military aerospace applications.  
V
B
LC  
B
B
I
3
2
1
O
V–  
FEATURES  
• Fast settling output current—70ns  
I
B
(MSB)  
O
TOP VIEW  
• 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  
NOTE:  
1. SO and non-standard pinouts.  
• Waveform generators  
• Audio encoders and attenuators  
• Analog meter drivers  
• Wide range multiplying capability  
• Programmable power supplies  
• CRT display drivers  
• Low FS current drift — ±10ppm/°C  
• Wide power supply range—±4.5V to ±18V  
• Low power consumption—37mW at ±5V  
• 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  
APPLICATIONS  
• 8-bit, 1µs A-to-D converters  
• Servo-motor and pen drivers  
716  
August 31, 1994  
853-0045 13721  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
ORDERING INFORMATION  
DESCRIPTION  
TEMPERATURE RANGE  
-55°C to +125°C  
-55°C to +125°C  
0 to +70°C  
ORDER CODE  
DWG #  
0582B  
0582B  
0406C  
0582B  
0406C  
0582B  
0005D  
0406C  
16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)  
16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)  
16-Pin Plastic Dual In-Line Package (DIP)  
16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)  
16-Pin Plastic Dual In-Line Package (DIP)  
16-Pin Hermetic Ceramic Dual In-Line Package (Cerdip)  
16-Pin Plastic Small Outline (SO) Package  
16-Pin Plastic Dual In-Line Package (DIP)  
DAC08F  
DAC08AF  
DAC08CN  
DAC08CF  
DAC08EN  
DAC08EF  
DAC08ED  
DAC08HN  
0 to +70°C  
0 to +70°C  
0 to +70°C  
0 to +70°C  
0 to +70°C  
BLOCK DIAGRAM  
MSB  
LSB  
V+  
V
1
B
B
B
B
B
B
B
B
8
LC  
1
2
3
4
5
6
7
13  
5
6
7
8
9
10  
11  
12  
4
I
BIAS  
OUT  
NETWORK  
CURRENT  
SWITCHES  
I
14  
15  
OUT  
2
V
V
(+)  
(–)  
REF  
REF  
+
–
REFERENCE  
AMPLIFIER  
3
16  
COMP.  
V–  
ABSOLUTE MAXIMUM RATINGS  
SYMBOL  
PARAMETER  
RATING  
36  
UNIT  
V+ to V-  
V -V  
Power supply voltage  
Digital input voltage  
V
V- to V- plus 36V  
V- to V+  
V- to +18  
5.0  
5
12  
V
LC  
V
0
Logic threshold control  
Applied output voltage  
Reference current  
V
I
mA  
14  
V
14  
P
D
, V  
15  
Reference amplifier inputs  
V to V  
EE CC  
Maximum power dissipation T =25°C  
A
1
(still-air)  
F package  
1190  
1450  
1090  
300  
mW  
mW  
mW  
°C  
N package  
D package  
T
SOLD  
Lead soldering temperature (10sec max)  
Operating temperature range  
DAC08, DAC08A  
T
A
-55 to +125  
0 to +70  
°C  
°C  
°C  
DAC08C, E, H  
T
STG  
Storage temperature range  
-65 to +150  
NOTES:  
1. Derate above 25°C, at the following rates:  
F package at 9.5mW/°C  
N package at 11.6mW/°C  
D package at 8.7mW/°C  
717  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
DC ELECTRICAL CHARACTERISTICS  
Pin 3 must be at least 3V more negative than the potential to which R is returned. V =±15V, I =2.0mA. Output characteristics refer to both  
15  
CC  
REF  
I
and I  
unless otherwise noted. DAC08C, E, H: T =0°C to 70°C DAC08/08A: T =-55°C to 125°C  
OUT  
OUT  
A
A
DAC08E  
DAC08  
DAC08C  
SYMBOL  
PARAMETER  
TEST CONDITIONS  
UNIT  
Min  
8
Typ  
8
Max  
8
Min  
8
Typ  
8
Max  
8
Resolution  
Bits  
Bits  
%FS  
%FS  
ppm/°C  
V
Monotonicity  
8
8
8
8
8
8
Relative accuracy  
Differential non-linearity  
Full-scale tempco  
Output voltage compliance  
Full-scale current  
Over temperature range  
±0.39  
±0.78  
±0.19  
±0.39  
TCI  
±10  
±10  
FS  
V
OC  
Full-scale current change< 1/2LSB  
-10  
+18  
2.04  
±16  
4.0  
-10  
+18  
2.04  
±8.0  
2.0  
I
I
I
V
=10.000V, R , R =5.000kΩ 1.94  
1.99  
±2.0  
0.2  
1.94  
1.99  
±1.0  
0.2  
mA  
FS4  
FSS  
ZS  
REF  
14  
15  
Full-scale symmetry  
Zero-scale current  
I
-I  
µA  
FS4 FS2  
µA  
R
, R =5.000kΩ  
15  
14  
I
Full-scale output current  
range  
V
V
=+15.0V, V-=-10V  
2.1  
4.2  
2.1  
4.2  
mA  
V
FSR  
REF  
=+25.0V, V-=-12V  
REF  
Logic input levels  
Low  
High  
V
V
0.8  
0.8  
IL  
V
V
=0V  
=0V  
LC  
2.0  
2.0  
IH  
Logic input current  
LC  
I
I
Low  
High  
V
V
=-10V to +0.8V  
-2.0  
0.002  
-10  
10  
-2.0  
0.002  
-10  
10  
µA  
IL  
IH  
IN  
=2.0V to 18V  
V-=-15V  
IN  
V
V
Logic input swing  
-10  
-10  
+18  
+13.5  
-3.0  
-10  
-10  
+18  
+13.5  
-3.0  
V
V
IS  
Logic threshold range  
Reference bias current  
Reference input slew rate  
Power supply sensitivity  
Positive  
V =±15V  
S
THR  
I
15  
-1.0  
8.0  
-1.0  
8.0  
µA  
dl/dt  
4.0  
4.0  
mA/µs  
I
=1mA  
REF  
PSSI  
V+=4.5 to 5.5V, V-=-15V;  
V+=13.5 to 16.5V, V-=-15V  
V-=-4.5 to -5.5V, V+=+15V;  
V-=-13.5 to -16.5, V+=+15V  
0.0003 0.01  
0.0003 0.01  
FS+  
%FS/%VS  
PSI  
Negative  
0.002  
0.01  
0.002  
0.01  
FS-  
Power supply current  
Positive  
Negative  
I+  
I-  
3.1  
-4.3  
3.8  
-5.8  
3.1  
-4.3  
3.8  
-5.8  
V =±5V, I  
=1.0mA  
S
REF  
I+  
I-  
Positive  
Negative  
3.1  
-7.1  
3.8  
-7.8  
3.1  
-7.1  
3.8  
-7.8  
V =+5V, -15V, I  
=2.0mA  
mA  
S
REF  
I+  
I-  
Positive  
Negative  
3.2  
-7.2  
3.8  
-7.8  
3.2  
-7.2  
3.8  
-7.8  
V =±15V, I  
=2.0mA  
S
REF  
±5V, I  
=1.0mA  
37  
48  
37  
48  
REF  
P
D
Power dissipation  
+5V, -15V, I  
=2.0mA  
122  
156  
136  
174  
122  
156  
136  
174  
mW  
REF  
±15V, I  
=2.0mA  
REF  
718  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
DC ELECTRICAL CHARACTERISTICS (Continued)  
Pin 3 must be at least 3V more negative than the potential to which R15 is returned. V = +15V, I  
= 2.0mA, Output characteristics refer to  
CC  
REF  
both I  
and I , unless otherwise noted. DAC08C, E, H: T = 0°C to 70°C. DAC08/08A: T = -55°C to 125°C.  
OUT A A  
OUT  
DAC08H  
DAC08A  
SYMBOL  
PARAMETER  
TEST CONDITIONS  
UNIT  
Min  
8
Typ  
8
Max  
8
Resolution  
Bits  
Bits  
%FS  
%FS  
ppm/°C  
V
Monotonicity  
8
8
8
Relative accuracy  
Differential non-linearity  
Full-scale tempco  
Output voltage compliance  
Full-scale current  
Over temperature range  
±0.1  
±0.19  
±50  
+18  
2.000  
±4.0  
1.0  
TCI  
±10  
FS  
V
OC  
Full-scale current change 1/2LSB  
-10  
I
I
I
V
=10.000V, R , R =5.000kΩ  
1.984  
1.992  
±1.0  
0.2  
mA  
FS4  
FSS  
ZS  
REF  
14  
15  
Full-scale symmetry  
Zero-scale current  
I
-I  
µA  
FS4 FS2  
µA  
R
, R =5.000kΩ  
15  
14  
I
Full-scale output current range  
V
V
=+15.0V, V-=-10V  
2.1  
4.2  
mA  
V
FSR  
REF  
=+25.0V, V-=-12V  
REF  
Logic input levels  
Low  
High  
V
V
0.8  
IL  
V
V
=0V  
=0V  
LC  
2.0  
IH  
Logic input current  
LC  
I
I
Low  
High  
V
V
=-10V to +0.8V  
-2.0  
0.002  
-10  
10  
µA  
IL  
IH  
IN  
=2.0V to 18V  
V-=-15V  
IN  
V
V
Logic input swing  
-10  
-10  
+18  
+13.5  
-3.0  
V
V
IS  
Logic threshold range  
Reference bias current  
Reference input slew rate  
Power supply sensitivity  
Positive  
V =±15V  
S
THR  
I
15  
-1.0  
8.0  
µA  
dl/dt  
4.0  
mA/µs  
I
=1mA  
REF  
PSSI  
V+=4.5 to 5.5V, V-=-15V;  
V+=13.5 to 16.5V, V-=-15V  
V-=-4.5 to -5.5V, V+=+15V;  
V-=-13.5 to -16.5, V+=+15V  
0.0003  
0.002  
0.01  
0.01  
FS+  
%FS/%VS  
PSI  
Negative  
FS-  
Power supply current  
Positive  
Negative  
I+  
I-  
V =±5V, I  
=1.0mA  
3.1  
-4.3  
3.8  
-5.8  
S
REF  
I+  
I-  
Positive  
Negative  
3.1  
-7.1  
3.8  
-7.8  
V =+5V, -15V, I  
=2.0mA  
mA  
S
REF  
I+  
I-  
Positive  
Negative  
3.2  
-7.2  
3.8  
-7.8  
V =±15V, I  
=2.0mA  
S
REF  
±5V, I  
=1.0mA  
37  
48  
REF  
P
D
Power dissipation  
+5V, -15V, I  
=2.0mA  
122  
156  
136  
174  
mW  
REF  
±15V, I  
=2.0mA  
REF  
719  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
AC ELECTRICAL CHARACTERISTICS  
DAC08E  
DAC08  
DAC08H  
DAC08A  
DAC08C  
SYMBOL  
PARAMETER  
TEST CONDITIONS  
UNIT  
Min  
Typ  
Max  
Min  
Typ  
Max  
Min  
Typ  
Max  
To ± 1/2LSB, all bits  
t
Settling time  
switched on or off,  
70  
135  
70  
135  
70  
135  
ns  
ns  
S
T =25°C  
A
Propagation delay  
Low-to-High  
t
t
T =25°C, each bit.  
A
PLH  
High-to-Low  
All bits switched  
35  
60  
35  
60  
35  
60  
PHL  
TEST CIRCUITS  
V–  
V+  
V
REF  
R
REF  
16  
14  
3
13  
DAC-08  
5-12  
4
R
f
15  
1
2
R15  
–
CONTROL  
LOGIC  
ERROR  
OUTPUT  
NE5534  
+
REFERENCE DAC  
ACCURACY > 0.006%  
Figure 1. Relative Accuracy Test Circuit  
V
CC  
0.1µF  
2.4V  
1.4V  
e
IN  
13  
0.4V  
+2.0V  
DC  
t
= t = 10ns  
5
PHL PLH  
USE R to GND  
L
1.0k  
1.0k  
1.0V  
14  
6
7
8
FOR TURN OFF  
MEASUREMENT  
SETTLING TIME  
15  
0.1µF  
FOR SETTLING TIME  
1
2
4
16  
R
R = 500Ω  
L
L
DAC-08  
9
10  
11  
MEASUREMENT  
(ALL BITS  
0
e
O
t
= 70ns TYPICAL  
TO ±1/2 LSB  
S
SWITCHED LOW  
TO HIGH)  
12  
e
IN  
51  
15pF  
C
≤ 25pF  
O
0
TRANSIENT  
RESPONSE  
0.1µF  
R
= 50Ω  
3
L
PIN 4 TO GND  
-100mV  
t
t
V
PLH  
PHL  
EE  
Figure 2. Transient Response and Settling Time  
720  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
TEST CIRCUITS (Continued)  
V
CC  
2V  
0
R
IN  
V
13  
IN  
1k  
5
R
= 200Ω  
EQ  
R
P
6
7
14  
15  
8
9
1
2
DAC-08  
10  
11  
12  
4
16  
OPEN  
10%  
0
dI  
dt  
dV  
dt  
I
90%  
SCOPE  
+
R
L
2.0mA  
R
0.1µF  
L
3
SLEWING TIME  
V
EE  
Figure 3. Reference Current Slew Rate Measurement  
V
CC  
I
CC  
13  
I
14  
R
14  
R
5
6
7
14  
A
A
A
V
(+)  
REF  
1
2
3
I
15  
15  
1
8
9
15  
A
A
DAC-08  
4
5
DIGITAL  
INPUTS  
2
4
10  
11  
12  
V
A
A
A
O
6
7
8
OUTPUT  
16  
I
O
(+)  
R
I
I
L
C
V
3
I
I
NOTES:  
(See text for values of C.)  
EE  
V
EE  
Typical values of R  
V
= R = 1k  
15  
14  
= +2.0V  
REF  
C = 15pF  
and I apply to inputs A through A  
8
V
I
I
1
The resistor tied to Pin 15 is to temperature compensate the bias current and may not be necessary for all applications.  
A
A
A
A
8
256  
A
A
A
A
7
128  
3
5
6
1
2
4
KŤ  
Ť
I
+
)
)
)
)
)
)
)
O
2
4
8
16  
32  
64  
V
REF  
where K [  
R
14  
and A = ‘1’ if A is at High Level  
N
N
N
N
A
= ‘0’ if A is at Low Level  
Figure 4. Notation Definitions  
721  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
TYPICAL PERFORMANCE CHARACTERISTICS  
Output Current vs Output Voltage  
(Output Voltage Compliance)  
True and Complementary Output  
Operation  
Fast Pulsed Reference Operation  
ALL BITS ON  
3.2  
2.8  
2.4  
2.0  
1.6  
1.2  
0.8  
0.4  
0
T
= T  
min  
TO T  
A
max  
2.5V  
0mA  
I
V
OUT  
IN  
I
= 2mA  
V– = –15V V– = –5V  
REF  
0.5V  
1.0mA  
–0.5mA  
I
OUT  
I
= 1mA  
REF  
I
–2.5mA  
2.0mA  
OUT  
I
= 0.2mA  
REF  
(00000000)  
(11111111)  
200ns/division  
–14 –10 –6 –2  
0
2
6
10  
14 18  
OUTPUT VOLTAGE (V)  
R
= 200Ω, R = 100Ω, CC = 0  
EQ  
L
Full-Scale Current vs  
Reference Current  
Full-Scale Settling Time  
LSB Switching  
5.0  
4.0  
3.0  
2.0  
1.0  
0
ALL BITS SWITCHED ON  
LIMIT FOR  
V–=–15V  
T
= T  
min  
TO T  
max  
A
ALL BITS “HIGH”  
2.4V  
0.4V  
2.4V  
BIT 8  
LOGIC  
INPUT  
0.4V  
0V  
OUTPUT – 1/2LSB  
0
8µA  
SETTLING +1/2LSB  
LIMIT FOR  
V–=–5V  
I
OUT  
0
50ns/DIVISIOM  
50ns/DIVISIOM  
I
=2mA, R =1kΩ 1/2LSB=4µA  
FS  
L
0
1.0  
2.0  
3.0  
4.0  
5.0  
I
— REFERENCE CURRENT (mA)  
REF  
LSB Propagation Delay vs IFS  
Reference Input Frequency Response  
500  
400  
300  
200  
100  
0
6
4
2
0
–2  
–4  
–6  
–8  
1
2
R14=R15=1kΩ  
≤ 500Ω  
3
1LSB=7.8µA  
R
L
–10 ALL BITS “ON”  
–12 VR15 = 0V  
–14  
1LSB=78nA  
0.1  
0.2  
0.5  
1.0  
2.0  
5.0  
10  
FREQUENCY (MHz)  
I
— OUTPUT FULL SCALE CURRENT (mA)  
FS  
NOTES:  
Curve 1: CC = 15pF, V = 2.0V  
centered at +1.0V  
P-P  
IN  
Curve 1: CC = 15pF, V = 5m0V  
centered at +200mV  
IN P-P  
Curve 1: CC = 15pF, V = 100m0V  
IN  
centered at 0V  
and applied through 50Ω connected to Pin 14.  
P-P  
+2.0V applied to R  
.
14  
722  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)  
Reference AMP Common-Mode Range  
All Bits On  
V
TH  
– V vs Temperature  
LC  
Logic Input Current vs Input Voltage  
3.2  
2.8  
2.4  
2.0  
1.6  
1.2  
0.8  
0.4  
0
8.0  
6.0  
4.0  
2.0  
0
2.0  
T
= T  
MIN  
to T  
MAX  
A
1.8  
1.6  
1.4  
1.2  
1.o  
0.8  
0.6  
0.4  
0.2  
0
V– = –15V V– = –5V V+ = +5V  
I
= 2mA  
REF  
I
I
= 1mA  
REF  
= 0.2mA  
REF  
–14 –10 –6 –2  
0
2
6
10 14 18  
–50  
0
50  
100  
150  
–12 –8 –4  
0
4
8
12 16  
TEMPERATURE (°C)  
V
— REFERENCE COMMON MODE VOLTAGE (V)  
LOGIC INPUT VOLTAGE (V)  
15  
POSITIVE COMMON-MODE RANGE IS ALWAYS (V+) –1.5V.  
Output Voltage Compliance  
vs Temperature  
Bit Transfer Characteristics  
Power Supply Current vs V+  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
20  
16  
8
ALL BITS HIGH OR LOW  
I
= 2.0mA  
REF  
B
7
1
I–  
12  
6
5
4
3
Shaded area indicates  
permissible output voltage  
8
range for V– = -15V, I  
REF  
≤ 2.0mA  
4
0
For other V– or I  
REF  
B
2
See “Output Current vs Output  
Voltage” curve on previous page  
I+  
2
B
B
3
4
5
1
0
–4  
V– = –15V  
V– = –5V  
–8  
–50  
0
50  
100  
150  
B
V+ – POSITIVE POWER SUPPLY (V  
)
DC  
–12  
–12  
–8  
–4  
0
4
8
12  
16  
–50  
0
50  
100  
150  
LOGIC INPUT VOLTAGE (V)  
TEMPERATURE (°C)  
NOTES:  
through B 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  
B
1
8
(V  
= 0.0V).  
LC  
Maximum Reference Input Frequency  
vs Compensation Capacitor Value  
Power Supply Current vs V–  
Power Supply Current vs Temperature  
10,000  
1,000  
100  
8
8
BITS MAY BE HIGH OR LOW  
BITS MAY BE HIGH OR LOW  
7
7
I– WITH I  
= 2mA  
REF  
V– = +15V  
I–  
6
5
4
3
2
1
0
6
5
4
3
2
1
0
I
= 2.0mA  
REF  
I– WITH I  
= 1mA  
REF  
I– WITH I  
= 0.2mA  
REF  
V+ = +15V  
I+  
I+  
0
–4.0  
–8.0  
–12  
–16  
–20  
–50  
0
50  
100  
150  
10  
V– — NEGATIVE POWER SUPPLY (V  
)
DC  
TEMPERATURE (°C)  
1
1000  
100  
10  
C
(pF)  
C
723  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
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.  
TYPICAL APPLICATION  
+V  
REF  
OPTIONAL RESISTOR  
FOR OFFSET  
INPUTS  
R
Output Current Range  
IN  
R
R
REF  
14  
15  
4
2
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.  
0V  
REQ  
=200Ω  
16  
P
NO CAP  
Accuracy  
NOTES:  
REQ = R || R  
IN  
Typical Values  
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.  
P
R
= 5kΩ  
IN  
+V = 10V  
IN  
Pulsed Referenced Operation  
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.  
The DAC08 series is guaranteed accurate to within ± LSB at +25°C  
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  
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  
15  
tied to a negative voltage corresponding to the minimum input level.  
current is trimmed to the same value with R so that a zero value  
14  
R
may be eliminated with only a small sacrifice in accuracy and  
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.  
15  
temperature drift.  
The compensation capacitor value must be increased as R value  
14  
is increased. This is in order to maintain proper phase margin. For  
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.  
R
values of 1.0, 2.5, and 5.0kΩ, minimum capacitor values are 15,  
14  
37, and 75pF, respectively. The capacitor may be tied to either V  
EE  
or ground, but using V increases negative supply rejection.  
EE  
(Fluctuations in the negative supply have more effect on accuracy  
than do any changes in the positive supply.)  
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.  
A negative reference voltage may be used if R is grounded and  
14  
the reference voltage is applied to R as shown. A high input  
15  
impedance is the main advantage of this method. The negative  
reference voltage must be at least 3.0V above the V supply.  
EE  
Bipolar input signals may be handled by connecting R to a positive  
14  
reference voltage equal to the peak positive input level at Pin 15.  
Settling Time  
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  
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  
logic is to be used as the reference, R should be formed of two  
14  
8-bit accuracy. This time applies when R <500Ω and C <25pF. The  
series resistors with the junction of the two resistors bypassed with  
0.1µF to ground. For reference voltages greater than 5.0V, a clamp  
diode is recommended between Pin 14 and ground.  
L
O
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.  
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.  
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, 100µF supply bypassing for low frequencies,  
minimum scope lead length, and avoidance of ground loops are all  
mandatory.  
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  
724  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
SETTLING TIME AND PROPAGATION DELAY  
V
+ = +15V  
S
V
IN  
C
3
V
ADJ  
Q
1
D
3
R
D
= 1000Ω  
2
R
V
= 1000Ω  
1
V
OUT  
5
6 7 8 9 10 11 12  
R
= 5kΩ  
14  
14  
15  
V
= 10V  
REF  
4
OUT  
DUT  
16  
I
= 2mA  
REF  
2
1
R = 500Ω  
3
3
1
C
4
D
2
50Ω  
C
5
C
R
= 5kΩ  
C
S
1
15  
2
V
– = –15V  
NOTES:  
D
D
C
, D = IN6263 or equivalent  
= IN914 or equivalent  
= 0.01µF  
1
3
1
2
2
C
, C = 0.1µF  
3
Q
= 2N3904  
1
C
, C = 15pF and includes all probe and fixturing capacitance.  
4
5
BASIC DAC08 CONFIGURATION  
MSB  
2
3
4
5
6
7
LSB  
+V  
REF  
I
REF  
R
REF  
5
6
7
8 9 10 11 12  
(LOW T.C.)  
I
I
14  
15  
O
4
2
DAC-08  
13  
O
3
16  
1
V–  
V+  
C
COMP  
0.1µF  
0.1µF  
NOTES:  
) V  
255  
256  
REF  
I
[
x
;
I
) I  
+ I  
for all logic states  
FS  
O
O
FS  
R
REF  
725  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
RECOMMENDED FULL-SCALE AND ZERO-SCALE ADJUST  
V
REF  
R
1
R
2
14  
4
2
DAC-08  
15  
R
3
R
= 1MΩ  
4
V–  
V+  
R
= 20kΩ  
S
NOTES:  
R
R
R
= low T.C.  
= R + R  
1
3
2
1
2
≈ 0.1 R to minimize pot. contribution to full-scale drift  
1
UNIPOLAR VOLTAGE OUTPUT FOR LOW IMPEDANCE OUTPUT  
5kΩ (LOW T.C.)  
I
= 2mA  
–
R
4
2
NE531  
OR  
EQUIV  
V
=
14  
15  
OUT  
0 TO +10V  
DAC-08  
+
5kΩ  
726  
August 31, 1994  
Philips Semiconductors Linear Products  
Product specification  
8-Bit high-speed multiplying D/A converter  
DAC08 Series  
UNIPOLAR VOLTAGE OUTPUT FOR HIGH IMPEDANCE OUTPUT  
V = 10V  
5kΩ  
5kΩ  
V
V
OUT  
OUT  
4
I
= 2mA  
R
DAC-08  
14  
2
a. Positive Output  
V
OUT  
4
I
= 2mA  
R
DAC-08  
2
14  
V
OUT  
a. Negative Output  
BASIC BIPOLAR OUTPUT OPERATION (OFFSET BINARY)  
V = 10V  
10kΩ  
10kΩ  
4
I
= 2mA  
R
DAC-08  
14  
V
V
OUT  
2
OUT  
B
B
B
3
B
B
B
B
B
V
V
1
2
4
5
6
7
8
OUT  
OUT  
Positive full-scale  
1
1
1
1
1
1
1
1
1
1
0
–9.920V  
–9.840V  
+10.000  
+9.920  
Positive FS – 1LSB  
1
1
1
1
1
+ Zero-scale + 1LSB  
Zero-scale  
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
–0.080V  
0.000  
+0.160  
+0.080  
Zero-scale – 1LSB  
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
0.080  
+9.920  
0.000  
–9.840  
–9.920  
Negative full scale – 1LSB  
Negative full scale  
+10.000  
727  
August 31, 1994  

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