12-Bit A/D Converter
V
REF
AIN1
AIN2
7672
23
V
DD
V
SS
2
+
-
1
24
12-BIT DAC
+
-
22
SUCCESSIVE APPROXIMATION
REGISTER
21
CONTROL
LOGIC
BUSY
12-BIT LATCH
20
19
CS
THREE-STATE
OUTPUT DRIVERS
CLOCK
OSCILLATOR
3
AGND
RD
18
17
CLK OUT
CLK IN
4
D11
11
D4
12
DGND
13
D3
16
D0
Logic Diagram
F
EATURES
:
• 12-bit high speed A/D converter
• R
AD
-P
AK
® radiation-hardened against natural space radia-
tion
• Total dose hardness:
- > 100 krad (Si), depending upon space mission
• Excellent Single Event Effect
- SEL > 120 Mev/mg/cm
2
- SEU
TH
> 5.8 Mev/mg/cm
2
- SEU
Sat
= -1E-4 cm
2
/Device
• Package:
- 24 pin R
AD
-P
AK
® flat package
- 24 pin R
AD
-P
AK
® DIP
• Fast conversion times:
- 7672-05: 5 µs
• Low 110 mW typical power consumption
- Corrects all single-bit errors
- Detects all double and some triple-bit errors
• High-speed BiCMOS technology
- Choice of +5V and +10V input ranges
- Operates with +5V and -12V power supplies
- Fast 125 ns bus-access time
(Si) total dose tolerance, depending upon space mission. The
7672 uses an accurate high-speed DAC and comparator to
achieve conversion time as low as 5 µs while dissipating only
110 mW of power. The 7672 is designed to be used with an
external reference voltage. This allows the user to choose a
reference whose performance suits the application or to drive
multiple 7672s from a single system reference, since the refer-
ence input is buffered and draws very little current. For digital
signal processing applications where absolute accuracy and
temperature coefficients may be unimportant, a low cost refer-
ence can be used. For optimal precision, a high accuracy ref-
erence where an absolute 12-bit accuracy can be obtained
over a wide temperature range may be used. Analog input
range is pin-selectable for 0 to +5V, 0 to +10V, or ±5V, making
the ADC ideal for data acquisition and analog input/output
cards. A high-speed digital interface (125 ns data access time)
with three state data outputs is compatible with most micro-
processors.
Maxwell Technologies' patented R
AD
-P
AK
® packaging technol-
ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, R
AD
-P
AK
provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
Memory
D
ESCRIPTION
:
Maxwell Technologies
’ 7672 high-speed 12-bit analog-to-
digital converter microcircuit features a greater than 100 krad
Rev 13
08.09.02
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
All data sheets are subject to change without notice
1
©2002 Maxwell Technologies
All rights reserved.
MAXWELL [ MAXWELL TECHNOLOGIES ]
