D/A Converter. MC1508-8 Datasheet

MC1508-8 Datasheet PDF


Part Number

MC1508-8

Description

(MC1508-8 / MC1408-8) 8-Bit Multiplying D/A Converter

Manufacture

NXP

Total Page 6 Pages
Datasheet
Download MC1508-8 Datasheet


MC1508-8
Philips Semiconductors Linear Products
8-bit multiplying D/A converter
Product specification
MC1508-8/1408-8
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 — 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
ORDERING INFORMATION
DESCRIPTION
16-Pin Ceramic Dual In-Line Package (CERDIP)
16-Pin Ceramic Dual In-Line Package (CERDIP)
16-Pin Plastic Dual In-Line Package (DIP)
16-Pin Small Outline (SO) Package
PIN CONFIGURATIONS
F, N Packages
NC 1
GND 2
VEE 3
IO 4
MSB A1
A2
A3
A4
5
6
7
8
16 COMPEN
15 VREF(–)
14 VREF(+)
13 VCC
12 A8 LSB
11 A7
10 A6
9 A5
D Package1
V+ 1
VREF(+) 2
VREF(–) 3
COMPEN 4
NC 5
GND 6
V– 7
IO 8
16 A8 LSB
15 A7
14 A6
13 A5
12 A4
11 A3
TOP VIEW
10 A2
9 A1 MSB
NOTE:
1. SO and non-standard pinouts.
TEMPERATURE RANGE
-55 to +125°C
0 to +70°C
0 to +70°C
0 to +70°C
ORDER CODE
MC1508-8F
MC1408-8F
MC1408-8N
MC1408-8D
DWG #
0582B
0582B
0406C
0005D
August 31, 1994
737 853-0935 13721

MC1508-8
Philips Semiconductors Linear Products
8-bit multiplying D/A converter
Product specification
MC1508-8/1408-8
BLOCK DIAGRAM
MSB
A1
5
A2 A3
67
A4 A5
89
LSB
A6 A7 A8
10 11 12
CURRENT SWITCHES
IO
4
R-2R LADDER
BIAS
CURRENT
2
GND
VREF
(+)
14
15
(–)
VREF
REFERENCE
CURRENT
AMPLIFIER
13
VCC
16
COMPEN
VEE 3
NPN CURRENT SOURCE PAIR
CIRCUIT DESCRIPTION
feedback. The termination amplifier holds the parasitic capacitance
The MC1508/MC1408 consists of a reference current amplifier, an
R-2R ladder, and 8 high-speed current switches. For many
of the ladder at a constant voltage during switching, and provides a
low impedance termination of equal voltage for all legs of the ladder.
applications, only a reference resistor and reference voltage need
be added.
The R-2R ladder divides the reference amplifier current into
binarily-related components, which are fed to the remainder current
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
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
PARAMETER
RATING
VCC
VEE
V5 – V12
VO
I14
V14, V15
PD
Positive power supply voltage
Negative power supply voltage
Digital input voltage
Applied output voltage
Reference current
Reference amplifier inputs
Maximum power dissipation,
TA = 25°C (still-air)1
F package
+5.5
–16.5
0 to VCC
–5.2 to +18
5.0
VEE to VCC
1190
N package
1450
D package
1080
TSOLD
TA
Lead soldering temperature (10 sec)
Operating temperature range
MC1508
300
300
–55 to +125
MC1408
0 to +75
TSTG
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 8.6mW/°C
UNIT
V
V
V
V
mA
mW
mW
mW
°C
°C
°C
°C
°C
August 31, 1994
738





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