7872
14-Bit A/D Converter
AGND
C
REF
REF OUT
V
IN
V
DD
V
DD
12
11
13
R
R
14
TRACK/HOLD
9
16
COMP
3V
REFERENCE
14-BIT DAC
CLK
3
CLOCK
SAR + COUNTER
CONTROL
CONVST
1
2
CONTROL
LOGIC
4
SERIAL
INTERFACE
5
SCLK
6
SDATA
8
DGND
15
V
SS
SSTRB
Logic Diagram
Memory
F
EATURES
:
• 14-bit resolution and accuracy
• Total dose hardness:
- > 100 krad (Si), depending upon space mission
• Single event effects:
- SEL > 104 MeV/mg/cm
2
- SEU
TH
= 1.4 MeV/mg/cm
2
- SEU
Sat
= 1E-3 cm
2
/Device
• Package:
- 16 pin R
AD
-P
AK
® flat package
- 16 pin R
AD
-P
AK
® dual-in-line package
• Fast Conversion Times: 10 µ s
• Low 50 mW typical power consumption
• High speed LC
2
MOS technology
- Analog input range of ±3V
- 83 KSPS throughput rate
- Operates with +5V/-5V power supplies
- 80 dB SNR at 10 kHz input frequency
- 2 s complement coding
- Serial output
D
ESCRIPTION
:
Maxwell Technologies’ 7872 high-speed 14-bit ADC microcir-
cuit features a greater than 100 krad (Si) total dose tolerance;
depending upon orbit. The 7872 consists of a track/hold ampli-
fier, successive-approximation ADC, 3V buried Zener refer-
ence and versatile interface logic. It features a self-contained,
laser- trimmed internal clock, so no external clock timing com-
ponents are required. For minimum noise possible, the on-
chip clock may be overridden to synchronize the device oper-
ation to the digital system. The 7872 is a serial output device.
It is capable of interfacing to all modern microprocessors and
digital signal processors. The 7872 operates from ±5V power
supplies, accepts bipolar input signals of ±3V and is able to
convert full power signals up to 41.5 kHz. It is also fully speci-
fied for dynamic performance parameters including distortion
and signal-to-noise ratio.
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.
5.21.02 Rev 4
All data sheets are subject to change without notice
1
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
©2001 Maxwell Technologies
All rights reserved.
MAXWELL [ MAXWELL TECHNOLOGIES ]
