MAXWELL 7846RPFS, 7846RPFI Datasheet
1
M
e
m
ory
All data sheets are subject to change without notice
(619) 503-3300 - Fax: (619) 503-3301- www.maxwell.com
16-Bit Digital to Analog Converter
7846
©2001 Maxwell Technologies
All rights reserved.
12.19.01 R ev 3
1000602
FEATURES:
•RAD-PAK® technology-hardened against natural space radi-
ation
• Total dose hardness:
- > 100 krad (Si), depending upon space mission
• Excellent Single Event Effects
- SEL
TH
> 114 MeV/mg/cm
2
- SEU < 8 Me V/mg/ c m
2
• Package:
-28 pin R
AD-PAK Flat Pack
• Microprocessor compatible with readback capability
• 16-Bit monotonicity over temperature
• ±2 LSBs integral linearity error
• Unipolar or bipolar output
• Multiplying capability
• Low power (100 mW typical)
DESCRIPTION:
Maxwell T echnologies’ 7846 16-Bit DAC converter microcircuit
features a greater than 100 krad (Si) total dose tolerance,
depending upon space mission. The 7846 has V
REF+
and
V
REF-
reference inputs and an on-chip output amplifier which
gives the option of unipolar or bipolar output. The 7846 uses a
segmented architecture. The 4 MSBs in the DAC latch select
one of the segments in a 16-resistor string. Both taps of the
segment are buffered by amplifiers and fed to a 12-bit DAC,
which provides a further 12 bits of resolution. This architecture
ensures 16-bit monotonicity. Excellent integral linearity results
from tight matching between the input offset voltages of the
two buffer amplifiers. In addition to the excellent accuracy
specifications, the 7846 also offers a comprehensive microprocessor interface. There are 16 data I/O pins, plus control
lines (CS
, R/W, LDAC and CLR). R/W and CS have readback
function which allows writing to and reading from the I/O latch.
Maxwell Technologies' patented R
AD-PAK® packaging technol-
ogy incorporates radiation shielding in the microcircuit package. 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-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
16
Segment
Switch
Matrix
Control
Logic
A2
A1
A3
I/O Latch
DAC Latch
12-bit DAC
+
+
+
R
R
6
5
23
22
25
24
203109
8
7
21 4
V
DD
V
CC
V
REF+
V
REF-
V
SS
DB15 DB0 DGND
CLR
LDAC
R/W
CS
V
OUT
R
IN
12
12
4
R
R
R
Logic Diagram
M
e
m
ory
2All data sheets are subject to change without notice
©2001 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846
12.19.01 R ev 3
1000602
TABLE 1. 7846 PINOUT DESCRIPTION
PIN SYMBOL DESCRIPTION
1-3 DB2-DB0 Data I/O pins. DB0 is LSB.
4V
DD
Positive supply for analog circuitry. This is +15V nominal.
5V
OUT
DAC output voltage pin.
6R
IN
Input to summing resistor of DAC output amplifier. This is used
to select output voltage ranges.
7V
REF+
V
REF+
Input. The DAC is specified for V
REF+
= +5V.
8V
REF-
V
REF-
Input. For unipolar operation connect V
REF-
to 0V and for
bipolar operation connect it to -5V. The device is specified for
both conditions.
9V
SS
Negative supply for the analog circuitry. This is -15V nominal.
10-19 DB15-DB6 Data I/O pins. DB15 is MSB.
20 DGND Ground pin for digital circuitry.
21 V
CC
Positive supply for digital circuitry . This is +5V nominal.
22 R/W
R/W Input. This can be used to load data to the DAC or to read
back the DAC latch contents.
23 CS
Chip select input. This selects the device.
24 CLR
Clear Input. The DAC can be cleared to 000...000 or
100...000.
25 LDAC
Asynchronous load input to DAC.
26-28 DB5-DB3 Data I/O pins.
M
e
m
ory
3All data sheets are subject to change without notice
©2001 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846
12.19.01 R ev 3
1000602
TABLE 2. 7846 A BSOLUTE MAXIMUM RATINGS
1
1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those i ndicated in the oper ati onal sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may
affect device reliability. Only one absolute maximum rating may be applied at any one time.
P
ARAMETER MIN MAX UNIT
VDD to DGND -0.3 +17 V
V
CC
to DGNDp c v c -0.3 VDD +0.3 or 7
(Whichever Is
Lower)
V
V
SS
to DGND -17 +0.3 V
V
REF+
to DGND -25 +2 5 V
V
REF-
to DGND -25 +2 5 V
V
OUT
to DGND
2
2. V
OUT
may be shorted to DGND, VDD, VSS and VCC provided that the power dissipation of the package is not exceeded.
-25 +25 V
R
IN
to DGND -25 +25 V
Digital Input Voltage to DGND -0.3 V
CC
+0.3 V
Digital Output Voltage to DGND -0.3 V
CC
+0.3 V
Power Dissipation (Any Package)
To +75
°
C
Derates above +75
°
C
1000
10
mW
mW/°C
Thermal Inpedance
Θ
JC
2.78 °C
Operating Temperature Range -55 +125
°
C
Storage Temperature Range -65 +150
°
C
TABLE 3. DELTA LIMITS
PARAMETER VARIATION
I
DD
± 10% of value specified in Table 4.
I
EE
± 10% of value specified in Table 4.
I
CC
± 10% of value specified in Table 4.
M
e
m
ory
4All data sheets are subject to change without notice
©2001 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846
12.19.01 R ev 3
1000602
TABLE 4. 7846 ELECTRICAL SPECIFICAT IONS
1
(VCC = +5 V ±5%, TA = -55 TO +125° C )
P
ARAMETER TEST CONDITIONS/COMMENTS
TA=-55 °C TO +125
°
C
U
NIT
Resolution 16 Bits
UNIPOLAR OUTPUT
Relative Accuracy @ 25
°
C
- T
MIN
to T
MAX
Differential Nonlinearity Error
Gain Error @ 25
°
C
- T
MIN
to T
MAX
Offset Error @ 25
°
C
- T
MIN
to T
MAX
Gain TC
2
Offset TC
2
V
REF-
=0V, V
OUT
=0V to +10V
1LSB=153µV
Guaranteed Monotonic
V
OUT
Load= 10MΩ
±16
±16
±1
±12
±24
±12
±24
±2
±2
LSB typ
LSB max
LSB max
LSB typ
LSB max
LSB typ
LSB max
ppm FSR/°C typ
ppm FSR/°C typ
BIPOLAR OUT P UT
Relative Accuracy @ 25
°
C
- T
MIN
to T
MAX
Differential Nonlinearity Error
Gain Error @ 25
°
C
- T
MIN
to T
MAX
Offset Error @ 25
°
C
- T
MIN
to T
MAX
Bipolar Zero Error @ 25 °C
- T
MIN
to T
MAX
Gain TC
2
Offset TC
2
Bipolar Zero TC
2
V
REF-
=-5V, V
OUT
=-10V to +10V
1LSB=305µV
Guaranteed Monotonic
V
OUT
Load=10MΩ
V
OUT
Load=10MΩ
±6
±8
±1
±6
±16
±6
±16
±6
±16
±2
±2
±2
LSB typ
LSB max
LSB max
LSB typ
LSB max
LSB typ
LSB max
LSB typ
LSB max
ppm FSR/
°
C typ
ppm FSR/
°
C typ
ppm FSR/
°
C typ
REFERENCE INPUT
Input Resistance
V
REF+
Range
V
REF-
Range
Resistance from V
REF-
to V
REF+
Typically 30kΩ
20
40
V
SS
+ 6 to VDD - 6
V
SS
+ 6 to VDD - 6
K
Ω min
K
Ω max
V
V
OUTPUT CHARAC T ERISTI CS
Output Voltage Swing
Resistive Load
1
Capacitive Load
3
Output Resistance
Short Circuit Current
To 0V
To 0V
To 0V or Any Power Supply
V
SS
+ 4 to VDD - 3
3
1000
0.3
±25
V max
k
Ω min
pF max
Ω typ
mA typ
DIGITAL INPUTS
V
IH
(Input High Voltage)
V
IL
(Input Low Voltage)
I
IN
(Input Current)
C
IN
(Input Capacitance)
2
2.4
0.8
±10
10
V min
V max
µA max
pF max
DIGITAL OUTPUTS
V
OL
(Output Low Voltage)
V
OH
(Output High Voltage)
Floating State Leakage Current
Floating State Output Capacitance
2
I
SINK
= 1.6mA
I
SOURCE
= 400µA
DB0-DB15 = 0 to V
CC
0.4
4.0
±10
10
V max
V min
µA max
pF max
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