7846B - DAC, 16 Bit

7846B
16-Bit Digital to Analog Converter
VREF+
4
R
R
A2
+
16
Segment
Switch
Matrix
6
RIN
5
VOUT
23
CS
22
R/W
R
A3
+
12-bit DAC
A1
+
R
VREF-
VDD
21
7
R
7846B
VCC
8
12
DAC Latch
4
Control
Logic
12
I/O Latch
25 LDAC
24
10
3
20
DB15
DB0
DGND
Memory
9
VSS
CLR
Logic Diagram
FEATURES:
DESCRIPTION:
• RAD-PAK® technology-hardened against natural
space radiation
• Package:
-28 pin RAD-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)
Maxwell Technologies’ 7846B 16-Bit DAC converter microcircuit features a greater than 100 krad (Si) total dose tolerance,
depending upon space mission. The 7846B has VREF+ and
VREF- reference inputs and an on-chip output amplifier which
gives the option of unipolar or bipolar output. The 7846B 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 7846B 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 RAD-PAK® packaging technology 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, RAD-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
02.27.08 REV 1
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All data sheets are subject to change without notice
1
©2008 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846B
TABLE 1. 7846B PINOUT DESCRIPTION
SYMBOL
DESCRIPTION
1-3
DB2-DB0
Data I/O pins. DB0 is LSB.
4
VDD
Positive supply for analog circuitry. This is +15V nominal.
5
VOUT
DAC output voltage pin.
6
RIN
Input to summing resistor of DAC output amplifier. This is used
to select output voltage ranges.
7
VREF+
VREF+ Input. The DAC is specified for VREF+ = +5V.
8
VREF-
VREF- Input. For unipolar operation connect VREF- to 0V and for
bipolar operation connect it to -5V. The device is specified for
both conditions.
9
VSS
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
VCC
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.
02.27.08 REV 1
All data sheets are subject to change without notice
Memory
PIN
2
©2008 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846B
TABLE 2. 7846B ABSOLUTE MAXIMUM RATINGS 1
MIN
MAX
UNIT
VDD to DGND
-0.3
+17
V
VCC to DGND
-0.3
VDD +0.3 or 7
(Whichever Is Lower)
V
VSS to DGND
-17
+0.3
V
VREF+ to DGND
-25
+25
V
VREF- to DGND
-25
+25
V
VOUT to DGND 2
-25
+25
V
RIN to DGND
-25
+25
V
Digital Input Voltage to DGND
-0.3
VCC +0.3
V
Digital Output Voltage to DGND
-0.3
VCC +0.3
V
1000
10
mW
mW/° C
Power Dissipation
To +75 ° C
Derates above +75 ° C
Thermal Inpedance
ΘJC
2.78
°C
Operating Temperature Range
-55
+125
°C
Storage Temperature Range
-65
+150
°C
Memory
PARAMETER
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 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.
2. VOUT may be shorted to DGND, VDD, VSS and VCC provided that the power dissipation of the package is not exceeded.
TABLE 3. DELTA LIMITS
PARAMETER
VARIATION
IDD
±10% of value specified in Table 4.
IEE
±10% of value specified in Table 4.
ICC
±10% of value specified in Table 4.
02.27.08 REV 1
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3
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All rights reserved.
16-Bit Digital to Analog Converter
7846B
TABLE 4. 7846B ELECTRICAL SPECIFICATIONS 1
(VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C)
PARAMETER
TEST CONDITIONS/COMMENTS
UNIT
16
Bits
1
2, 3
1
1
2,3
1
2,3
1
1
±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
1
2, 3
1
1
2, 3
1
2, 3
1
2, 3
1
1
1
±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
1, 2, 3
20
40
VSS + 6 to VDD - 6
VSS + 6 to VDD - 6
KΩ min
KΩ max
V
V
1, 2, 3
VSS + 4 to VDD - 3
3
1000
0.3
±25
V max
kΩ min
pF max
Ω typ
mA typ
1, 2, 3
2.4
0.8
±10
10
V min
V max
µ A max
pF max
1, 2, 3
0.4
4.0
±10
10
V max
V min
µ A max
pF max
Resolution
UNIPOLAR OUTPUT
Relative Accuracy @ 25 ° C
- TMIN to TMAX
Differential Nonlinearity Error
Gain Error @ 25 ° C
- TMIN to TMAX
Offset Error @ 25 ° C
- TMIN to TMAX
Gain TC 2
Offset TC 2
VREF-=0V, VOUT=0V to +10V
1LSB=153µ V
BIPOLAR OUTPUT
Relative Accuracy @ 25 ° C
- TMIN to TMAX
Differential Nonlinearity Error
Gain Error @ 25 ° C
- TMIN to TMAX
Offset Error @ 25 ° C
- TMIN to TMAX
Bipolar Zero Error @ 25 ° C
- TMIN to TMAX
Gain TC 2
Offset TC 2
Bipolar Zero TC 2
VREF-=-5V, VOUT=-10V to +10V
1LSB=305µ V
REFERENCE INPUT
Input Resistance
Guaranteed Monotonic
VOUT Load= 10MΩ
Guaranteed Monotonic
VOUT Load=10MΩ
VOUT Load=10MΩ
Resistance from VREF- to VREF+
Typically 30kΩ
VREF+ Range
VREF- Range
OUTPUT CHARACTERISTICS
Output Voltage Swing
Resistive Load1
Capacitive Load3
Output Resistance
Short Circuit Current
To 0V
To 0V
To 0V or Any Power Supply
DIGITAL INPUTS
VIH (Input High Voltage)
VIL (Input Low Voltage)
IIN (Input Current)
CIN (Input Capacitance) 2
DIGITAL OUTPUTS
VOL (Output Low Voltage)
VOH (Output High Voltage)
Floating State Leakage Current
Floating State Output Capacitance 2
ISINK = 1.6mA
ISOURCE = 400µ A
DB0-DB15 = 0 to VCC
02.27.08 REV 1
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4
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Memory
TA=-55 ° C TO +125
°C
SUBGROUPS
16-Bit Digital to Analog Converter
7846B
TABLE 4. 7846B ELECTRICAL SPECIFICATIONS 1
(VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C)
TEST CONDITIONS/COMMENTS
PARAMETER
POWER REQUIREMENTS 4
VDD
VSS
VCC
IDD
ISS
ICC
Power Supply Sensitivity 5
Power Dissipation
SUBGROUPS
1, 2, 3
VOUT Unloaded
VOUT Unloaded
VOUT Unloaded
TA=-55 ° C TO +125
°C
UNIT
+11.4/+15.75
-11.4/-15.75
+4.75/+5.25
5
5
1
2
100
V min/V max
V min/V max
V min/V max
mA max
mA max
mA max
LSB/V max
mW typ
1. Minimum load is 3kΩ.
2. Sample tested to ensure compliance.
3. Maximum load is 1000pF.
4. 7846ARP is functional with power supplies of ±12V. See typical performance curves.
Memory
5. Sensitivity to Gain Error, Offset Error and Bipolar Zero Error to VDD, VSS variations.
6. Guaranteed by design
TABLE 5. 7846B AC PERFORMANCE CHARACTERISTICS1
(VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C)
TA=25° C
TA=TMIN TO TMAX
UNIT
To 0.006% FSR. VOUT loaded. VREF-=0V.
7
7
µ s max
To 0.003% FSR. VOUT loaded. VREF-=-5V.
9
9
µ s max
Digital-to-Analog Glitch
Impulse
DAC alternately loaded with 10…0000 and
01…1111. VOUT unloaded.
400
400
nV-secs typ
AC Feed through
VREF-=0V, VREF+=1V rms, 10kHz sine wave.
DAC loaded with all 0s.
0.5
0.5
mV pk-pk typ
Digital Feed through
DAC alternately loaded with all 1s and all
0s. CS High.
10
10
nV-secs typ
Output Noise Voltage
Density
(1kHz-100kHz)
Measured at VOUT. DAC loaded with
0111011…11.
VREF+=VREF-=0V.
50
50
nV/(Hz)½ typ
PARAMETER
TEST CONDITIONS
Output Settling Time
1. Guaranteed by design.
02.27.08 REV 1
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16-Bit Digital to Analog Converter
7846B
TABLE 6. 7846B TIMING CHARACTERISTICS1,2,3,4
(VDD = +14.25V TO 15.75V; VSS = -14.25V TO -15.75V; VCC = 4.75 TO 5.25V; UNLESS OTHERWISE SPECIFIED)
LIMIT AT
TA=-55 ° C TO +125 ° C
UNIT
R/W to CS Setup Time
50
ns min
t2
CS Pulse Width (Write Cycle)
190
ns min
t3
R/W to CS Hold Time
50
ns min
t4
Data Setup Time
120
ns min
t5
Data Hold Time
0
ns min
t6
Data Access Time
320
ns max
t7
Bus Relinquish Time
10
ns min
90
ns max
PARAMETER
TEST CONDITIONS/COMMENTS
t1
CLR Setup Time
20
ns min
t9
CLR Pulse Width
150
ns min
t10
CLR Hold Time
0
ns min
t11
LDAC Pulse Width
100
ns min
t12
CS Pulse Width (Read Cycle)
330
ns min
Memory
t8
1. Guaranteed by design. All input control signals are specified with tR = tF = 5ns (10% to 90% of +5V) and timed from a voltage
level of 1.6V.
2. t6 is measured with the load circuits of Figure 1 and defined as the time required for an output to cross 0.8V or 2.4V.
3. t7 is defined as the time required for an output to change 0.5V when loaded with the circuits of Figure 2. Specifications subject to
change without notice.
4. See Figure 3 on page 7.
02.27.08 REV 1
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6
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16-Bit Digital to Analog Converter
7846B
FIGURE 1. LOAD CIRCUITS FOR ACCESS TIME (t6)
FIGURE 2. LOAD CIRCUITS FOR BUS RELINQUISH TIME (t7)
Memory
FIGURE 3. 16-BIT DIGITAL TO ANALOG CONVERTER
R./W
t1
t3
t3
t1
5V
0V
t12
t2
CS
5V
0V
t7
t5
t4
t6
5V
DATA
Data Valid
Data Valid
CLR
t8
t9
t10
t8
t9
0V
t10
5V
t11
LDAC
0V
5V
0V
02.27.08 REV 1
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©2008 Maxwell Technologies
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16-Bit Digital to Analog Converter
7846B
Memory
02.27.08 REV 1
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©2008 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846B
Memory
28 PIN RAD-PAK® FLAT PACKAGE
DIMENSION
SYMBOL
MIN
NOM
MAX
A
0.190
0.207
0.224
b
0.015
0.017
0.022
c
0.004
0.005
0.009
D
--
0.720
0.740
E
0.380
0.410
0.420
E1
--
--
0.440
E2
0.180
0.250
--
E3
0.030
0.080
--
e
0.050 BSC
L
0.360
0.370
0.380
Q
0.062
0.073
0.081
S1
0.000
0.027
--
N
28
Note: All dimensions in inches
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9
©2008 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846B
Important Notice:
These data sheets are created using the chip manufacturers published specifications. Maxwell Technologies verifies
functionality by testing key parameters either by 100% testing, sample testing or characterization.
The specifications presented within these data sheets represent the latest and most accurate information available to
date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no
responsibility for the use of this information.
Maxwell Technologies’ products are not authorized for use as critical components in life support devices or systems
without express written approval from Maxwell Technologies.
Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Technologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts.
Memory
02.27.08 REV 1
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10
©2008 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846B
Product Ordering Options
Model Number
7846B
RP
F
X
Option Details
Feature
Monolithic
S = Maxwell Class S
B = Maxwell Class B
I = Industrial (testing @ -55°C,
+25°C, +125°C)
E = Engineering (testing @ +25°C)
Package
F = Flat Pack
Radiation Feature
RP = RAD-PAK® package
Base Product
Nomenclature
16-Bit Digital to Analog Converter
02.27.08 REV 1
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Memory
Screening Flow
11
©2008 Maxwell Technologies
All rights reserved.
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