Philips Semiconductors Linear Products |
Product specification |
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8-bit multiplying D/A converter |
MC1508-8/1408-8 |
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DESCRIPTION
The MC1508/MC1408 series of 8-bit monolithic digital-to-analog converters provide high-speed performance with low cost. They are designed for use where the output current is a linear product of an 8-bit digital word and an analog reference voltage
FEATURES
•Fast settling time Ð 70ns (typ)
•Relative accuracy ±0.19% (max error)
•Non-inverting digital inputs are TTL and CMOS compatible
•High-speed multiplying rate 4.0mA/μs (input slew)
•Output voltage swing +0.5V to ±5.0V
•Standard supply voltages +5.0V and ±5.0V to ±15V
•Military qualifications pending
APPLICATIONS
•Tracking A-to-D converters
•2 1/2-digit panel meters and DVMs
•Waveform synthesis
•Sample-and-Hold
•Peak detector
•Programmable gain and attenuation
•CRT character generation
•Audio digitizing and decoding
•Programmable power supplies
•Analog-digital multiplication
•Digital-digital multiplication
•Analog-digital division
•Digital addition and subtraction
•Speech compression and expansion
•Stepping motor drive modems
•Servo motor and pen drivers
PIN CONFIGURATIONS
F, N Packages
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NC |
1 |
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16 |
COMPEN |
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GND |
2 |
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15 |
VREF(±) |
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VEE |
3 |
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14 |
VREF(+) |
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I |
4 |
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13 |
V |
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O |
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CC |
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MSB A1 |
5 |
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12 |
A8 LSB |
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A2 |
6 |
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11 |
A7 |
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A3 |
7 |
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10 |
A6 |
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A4 |
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8 |
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9 |
A5 |
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D Package1
V+ |
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1 |
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16 |
A8 |
LSB |
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A7 |
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VREF(+) |
2 |
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15 |
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A6 |
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VREF(±) |
3 |
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14 |
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A5 |
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COMPEN |
4 |
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13 |
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NC |
5 |
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12 |
A4 |
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GND |
6 |
TOP VIEW |
11 |
A3 |
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V± |
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7 |
10 |
A2 |
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IO |
8 |
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9 |
A1 |
MSB |
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NOTE:
1. SO and non-standard pinouts.
ORDERING INFORMATION
DESCRIPTION |
TEMPERATURE RANGE |
ORDER CODE |
DWG # |
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16-Pin Ceramic Dual In-Line Package (CERDIP) |
-55 to +125°C |
MC1508-8F |
0582B |
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16-Pin Ceramic Dual In-Line Package (CERDIP) |
0 to +70°C |
MC1408-8F |
0582B |
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16-Pin Plastic Dual In-Line Package (DIP) |
0 to +70°C |
MC1408-8N |
0406C |
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16-Pin Small Outline (SO) Package |
0 to +70°C |
MC1408-8D |
0005D |
August 31, 1994 |
737 |
853-0935 13721 |
Philips Semiconductors Linear Products |
Product specification |
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8-bit multiplying D/A converter |
MC1508-8/1408-8 |
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BLOCK DIAGRAM
MSB |
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LSB |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
A8 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
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IO |
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CURRENT SWITCHES |
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4 |
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R-2R LADDER |
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BIAS |
2 |
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CURRENT |
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GND |
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VREF |
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(+) |
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14 |
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13 |
15 |
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REFERENCE |
VCC |
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CURRENT |
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(±) |
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AMPLIFIER |
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VREF |
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16 |
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COMPEN |
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VEE |
3 |
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NPN CURRENT SOURCE PAIR |
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CIRCUIT DESCRIPTION
The MC1508/MC1408 consists of a reference current amplifier, an R-2R ladder, and 8 high-speed current switches. For many applications, only a reference resistor and reference voltage need be added.
The switches are non-inverting in operation; therefore, a high state on the input turns on the specified output current component.
The switch uses current steering for high speed, and a termination amplifier consisting of an active load gain stage with unity gain
feedback. The termination amplifier holds the parasitic capacitance of the ladder at a constant voltage during switching, and provides a low impedance termination of equal voltage for all legs of the ladder.
The R-2R ladder divides the reference amplifier current into binarily-related components, which are fed to the remainder current which is equal to the least significant bit. This current is shunted to ground, and the maximum output current is 255/256 of the reference amplifier current, or 1.992mA for a 2.0mA reference amplifier current if the NPN current source pair is perfectly matched.
ABSOLUTE MAXIMUM RATINGS
SYMBOL |
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PARAMETER |
RATING |
UNIT |
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VCC |
Positive power supply voltage |
+5.5 |
V |
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VEE |
Negative power supply voltage |
±16.5 |
V |
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V5 ± V12 |
Digital input voltage |
0 to VCC |
V |
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VO |
Applied output voltage |
±5.2 to +18 |
V |
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I14 |
Reference current |
5.0 |
mA |
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V14, V15 |
Reference amplifier inputs |
VEE to VCC |
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PD |
Maximum power dissipation, |
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T |
1 |
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= 25°C (still-air) |
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A |
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F package |
1190 |
mW |
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N package |
1450 |
mW |
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D package |
1080 |
mW |
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TSOLD |
Lead soldering temperature (10 sec) |
300 |
°C |
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TA |
Operating temperature range |
300 |
°C |
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MC1508 |
±55 to +125 |
°C |
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MC1408 |
0 to +75 |
°C |
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TSTG |
Storage temperature range |
-65 to +150 |
°C |
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 8.6mW/°C
August 31, 1994 |
738 |