7846
16-Bit Digital to Analog Converter
V
CC
21
V
REF+
7
R
V
DD
4
R
-
A2
+
R
-
A3
+
6
R
IN
R
16
Segment
Switch
Matrix
-
A1
+
4
5
V
OUT
12-bit DAC
12
23
CS
R/W
R
V
REF-
8
DAC Latch
12
Control
Logic
22
25 LDAC
24
CLR
I/O Latch
9
V
SS
10
DB15
3
DB0
20
DGND
Memory
Logic Diagram
F
EATURES
:
• R
AD
-P
AK
® 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 MeV/mg/cm
2
• Package:
-28 pin R
AD
-P
AK
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)
D
ESCRIPTION
:
Maxwell Technologies’ 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 micro-
processor 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
-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.
1000602
12.19.01 Rev 3
All data sheets are subject to change without notice
1
(619) 503-3300 - Fax: (619) 503-3301- www.maxwell.com
©2001 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
T
ABLE
1. 7846 P
INOUT
D
ESCRIPTION
P
IN
1-3
4
5
6
7
8
S
YMBOL
DB2-DB0
V
DD
V
OUT
R
IN
V
REF+
V
REF-
D
ESCRIPTION
Data I/O pins. DB0 is LSB.
Positive supply for analog circuitry. This is +15V nominal.
DAC output voltage pin.
Input to summing resistor of DAC output amplifier. This is used
to select output voltage ranges.
V
REF+
Input. The DAC is specified for V
REF+
= +5V.
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.
Negative supply for the analog circuitry. This is -15V nominal.
Data I/O pins. DB15 is MSB.
Ground pin for digital circuitry.
Positive supply for digital circuitry. This is +5V nominal.
R/W Input. This can be used to load data to the DAC or to read
back the DAC latch contents.
Chip select input. This selects the device.
Clear Input. The DAC can be cleared to 000...000 or
100...000.
Asynchronous load input to DAC.
Data I/O pins.
7846
9
10-19
20
21
22
23
24
25
26-28
V
SS
DB15-DB6
DGND
V
CC
R/W
CS
CLR
LDAC
DB5-DB3
Memory
1000602
12.19.01 Rev 3
All data sheets are subject to change without notice
2
©2001 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
T
ABLE
2. 7846 A
BSOLUTE
M
AXIMUM
R
ATINGS 1
P
ARAMETER
V
DD
to DGND
V
CC
to DGNDpcvc
M
IN
-0.3
-0.3
M
AX
+17
V
DD
+0.3 or 7
(Whichever Is
Lower)
+0.3
+25
+25
+25
+25
V
CC
+0.3
V
CC
+0.3
1000
10
7846
U
NIT
V
V
V
SS
to DGND
V
REF+
to DGND
V
REF-
to DGND
V
OUT
to DGND
2
R
IN
to DGND
Digital Input Voltage to DGND
Digital Output Voltage to DGND
Power Dissipation (Any Package)
To +75
°
C
Derates above +75
°
C
Thermal Inpedance
Operating Temperature Range
Storage Temperature Range
-17
-25
-25
-25
-25
-0.3
-0.3
V
V
V
V
V
V
V
Memory
mW
mW/
°
C
°C
°
C
°
C
Θ
JC
-55
-65
2.78
+125
+150
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 indicated in the operational sec-
tions 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.
2. V
OUT
may be shorted to DGND, V
DD
, V
SS
and V
CC
provided that the power dissipation of the package is not exceeded.
T
ABLE
3. D
ELTA
L
IMITS
P
ARAMETER
I
DD
I
EE
I
CC
V
ARIATION
±10% of value specified in Table 4.
±10% of value specified in Table 4.
±10% of value specified in Table 4.
1000602
12.19.01 Rev 3
All data sheets are subject to change without notice
3
©2001 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
T
ABLE
4. 7846 E
LECTRICAL
S
PECIFICATIONS 1
(V
CC
= +5 V ±5%, T
A
= -55
TO
+125°C)
P
ARAMETER
Resolution
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
BIPOLAR 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
Bipolar Zero Error @ 25
°
C
- T
MIN
to T
MAX
Gain TC
2
Offset TC
2
Bipolar Zero TC
2
REFERENCE INPUT
Input Resistance
V
REF+
Range
V
REF-
Range
OUTPUT CHARACTERISTICS
Output Voltage Swing
Resistive Load
1
Capacitive Load
3
Output Resistance
Short Circuit Current
DIGITAL INPUTS
V
IH
(Input High Voltage)
V
IL
(Input Low Voltage)
I
IN
(Input Current)
C
IN
(Input Capacitance)
2
DIGITAL OUTPUTS
V
OL
(Output Low Voltage)
V
OH
(Output High Voltage)
Floating State Leakage Current
Floating State Output Capacitance
2
1000602
7846
T
A
=-55
°
C
TO
+125
°
C
16
U
NIT
Bits
LSB typ
LSB max
LSB max
LSB typ
LSB max
LSB typ
LSB max
ppm FSR/°C typ
ppm FSR/°C typ
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
K
Ω
min
K
Ω
max
V
V
V max
k
Ω
min
pF max
Ω
typ
mA typ
V min
V max
µ A max
pF max
V max
V min
µ A max
pF max
T
EST
C
ONDITIONS
/C
OMMENTS
V
REF-
=0V, V
OUT
=0V to +10V
1LSB=153µ V
Guaranteed Monotonic
V
OUT
Load= 10M
Ω
±16
±16
±1
±12
±24
±12
±24
±2
±2
±6
±8
±1
±6
±16
±6
±16
±6
±16
±2
±2
±2
20
40
V
SS
+ 6 to V
DD
- 6
V
SS
+ 6 to V
DD
- 6
V
SS
+ 4 to V
DD
- 3
3
1000
0.3
±25
2.4
0.8
±10
10
V
REF-
=-5V, V
OUT
=-10V to +10V
1LSB=305µ V
Guaranteed Monotonic
V
OUT
Load=10M
Ω
V
OUT
Load=10M
Ω
Memory
Resistance from V
REF-
to V
REF+
Typically 30k
Ω
To 0V
To 0V
To 0V or Any Power Supply
I
SINK
= 1.6mA
I
SOURCE
= 400µ A
DB0-DB15 = 0 to V
CC
0.4
4.0
±10
10
12.19.01 Rev 3
All data sheets are subject to change without notice
4
©2001 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
T
ABLE
4. 7846 E
LECTRICAL
S
PECIFICATIONS 1
(V
CC
= +5 V ±5%, T
A
= -55
TO
+125°C)
P
ARAMETER
Resolution
POWER REQUIREMENTS
4
V
DD
V
SS
V
CC
I
DD
I
SS
I
CC
Power Supply Sensitivity
5
Power Dissipation
1. Minimum load is 3k
Ω
.
2. Sample tested to ensure compliance.
3. Maximum load is 1000pF.
T
EST
C
ONDITIONS
/C
OMMENTS
T
A
=-55
°
C
TO
+125
°
C
16
+11.4/+15.75
-11.4/-15.75
+4.75/+5.25
5
5
1
2
100
7846
U
NIT
Bits
V min/V max
V min/V max
V min/V max
mA max
mA max
mA max
LSB/V max
mW typ
V
OUT
Unloaded
V
OUT
Unloaded
V
OUT
Unloaded
Memory
4. 7846RP is functional with power supplies of ±12V. See typical performance curves.
5. Sensitivity to Gain Error, Offset Error and Bipolar Zero Error to V
DD
, V
SS
variations.
6. Guaranteed by design
T
ABLE
5. 7846 AC P
ERFORMANCE
C
HARACTERISTICS1
(V
CC
= +5 V ±5%, T
A
= -55
TO
+125°C)
P
ARAMETER
Output Settling Time
Digital-to-Analog Glitch
Impulse
AC Feed through
Digital Feed through
T
EST
C
ONDITIONS
To 0.006% FSR. V
OUT
loaded. V
REF-
=0V.
To 0.003% FSR. V
OUT
loaded. V
REF-
=-5V.
DAC alternately loaded with 10…0000 and
01…1111. V
OUT
unloaded.
V
REF-
=0V, V
REF+
=1V rms, 10kHz sine wave.
DAC loaded with all 0s.
DAC alternately loaded with all 1s and all
0s. CS High.
T
A
=25
°
C
7
9
400
0.5
10
50
T
A
=T
MIN TO
T
MAX
7
9
400
0.5
10
50
U
NIT
µ s max
µ s max
nV-secs typ
mV pk-pk typ
nV-secs typ
nV/(Hz)
½
typ
Output Noise Voltage Den- Measured at V
OUT
. DAC loaded with
0111011…11.
sity
V
REF+
=V
REF-
=0V.
(1kHz-100kHz)
1. Guaranteed by design.
1000602
12.19.01 Rev 3
All data sheets are subject to change without notice
5
©2001 Maxwell Technologies
All rights reserved.
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