TI1 DAC7545KU Cmos 12-bit multiplying digital-to-analog converter microprocessor compatible Datasheet

DAC7545
DA
C75
DAC
7 54
45
5
SBAS150A – AUGUST 1987 – REVISED FEBRUARY 2003
CMOS 12-Bit Multiplying
DIGITAL-TO-ANALOG CONVERTER
Microprocessor Compatible
FEATURES
DESCRIPTION
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The DAC7545 is a low-cost, CMOS, 12-bit, four-quadrant
multiplying, digital-to-analog converter (DAC) with input data
latches. The input data is loaded into the DAC as a 12-bit
data word. The data flows through to the DAC when both the
chip select (CS ) and the write (WR) pins are at a logic low.
FOUR-QUADRANT MULTIPLICATION
LOW-GAIN TC: 2ppm/°C typ
MONOTONICITY ENSURED OVER TEMPERATURE
SINGLE 5V TO 15V SUPPLY
TTL/CMOS LOGIC COMPATIBLE
LOW OUTPUT LEAKAGE: 10nA max
LOW OUTPUT CAPACITANCE: 70pF max
DIRECT REPLACEMENT FOR THE AD7545,
PM-7545
Laser-trimmed thin-film resistors and excellent CMOS voltage switches provide true 12-bit integral and differential
linearity. The device operates on a single +5V to +15V supply
and is available in an SO-20 package; devices are specified
over the commercial temperature range.
The DAC7545 is well suited for battery-powered or other lowpower applications because the power dissipation is less than
0.5mW when used with CMOS logic inputs and VDD = +5V.
RFB
20
VREF 19
12-Bit
Multiplying DAC
12
WR 17
CS 16
Input
Data Latches
1
OUT 1
2
AGND
18
3
VDD
DGND
12
DB11-DB0
(Pins 4-15)
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright © 1987-2003, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
ELECTROSTATIC
DISCHARGE SENSITIVITY
ABSOLUTE MAXIMUM RATINGS(1)
TA = +25°C, unless otherwise noted.
VDD to DGND ........................................................................... –0.3V, +17
Digital Input to DGND ............................................................... –0.3V, VDD
VRFB, VREF, to DGND ........................................................................ ±25V
VPIN 1 to DGND ........................................................................ –0.3V, VDD
AGND to DGND ........................................................................ –0.3V, VDD
Power Dissipation: Any Package to +75°C .................................... 450mW
Derates above +75°C by ................................ 6mW/°C
Operating Temperature:
Commercial J, K, L, and GL ........................................... –40°C to +85°C
Storage Temperature ...................................................... –65°C to +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
NOTE: (1) Stresses above those listed above may cause permanent damage to
the device. This is a stress rating only and functional operation of the device at
these or any other condition above those indicated in the operational sections of
this specification is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
PACKAGE/ORDERING INFORMATION
PRODUCT
DAC7545
"
DAC7545
"
SPECIFIED
RELATIVE
GAIN ERROR (LSB)
PACKAGE
TEMPERATURE
ACCURACY (LSB)
VDD = +5V
PACKAGE-LEAD DESIGNATOR(1)
RANGE
±2
±1
±1/2
±1/2
±20
±10
±5
±2
SO-20
"
SO-20
"
DW
"
DW
"
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
–40°C to +85°C DAC7545JU DAC7545JU
"
DAC7545KU DAC7545KU
–40°C to +85°C DAC7545LU DAC7545LU
"
DAC7545GLU DAC7545GLU
Rails,
Rails,
Rails,
Rails,
38
38
38
38
NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.
PIN CONNECTIONS
Top View
SO
OUT 1
1
20 RFB
AGND
2
19 VREF
DGND
3
18 VDD
(MSB) DB11
4
17 WR
DB10
5
DB9
6
15 DB0 (LSB)
DB8
7
14 DB1
DB7
8
13 DB2
DB6
9
12 DB3
DB5 10
11 DB4
DAC7545
16 CS
WRITE CYCLE TIMING DIAGRAM
CS
tCS
tCH
VDD
Mode Selection
0
WR
tWR
VDD
tDS
Data In
(DB0-DB11)
2
VIH
VIL
Write Mode
Data
Valid
tDH
CS and WR low, DAC responds
Data Bus (DB0-DB11) inputs.
0
VDD
0
Hold Mode
Either CS or WR high, data bus to
(DB0-DB11) is locked out; DAC
holds last data present when
WR or CS assumed high state.
NOTES: VDD = +5V, tR = tF = 20ns. VDD = +15V, tR = tF = 40ns. All inputs signal
rise and fall times measured from 10% to 90% of VDD. Timing measurement
reference level is (VIH + VIL)/2.
DAC7545
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SBAS150A
ELECTRICAL CHARACTERISTICS
VREF = +10V, VOUT 1 = 0V, and ACOM = DCOM, unless otherwise specified.
DAC7545
VDD = +5V
VDD = +15V
GRADE
TA = +25°C
TMAX-TMIN(1)
TA = +25°C
TMAX-TMIN(1)
All
J
K
L
GL
J
K
L
GL
J
K
L
GL
12
±2
±1
±1/2
±1/2
±4
±1
±1
±1
±20
±10
±5
±2
12
±2
±1
±1/2
±1/2
±4
±1
±1
±1
±20
±10
±6
±3
12
±2
±1
±1/2
±1/2
±4
±1
±1
±1
±25
±15
±10
±6
12
±2
±1
±1/2
±1/2
±4
±1
±1
±1
±25
±15
±10
±7
Gain Temperature Coefficient(3)
(∆Gain/∆Temperature)
All
±5
±5
±10
±10
DC Supply Rejection(3)
(∆Gain/∆VDD)
Output Leakage Current at Out 1
All
J, K, L, GL
0.015
10
0.03
50
0.01
10
0.02
50
%/%
nA
All
2
2
2
2
µs
300
400
5
5
250
250
5
5
PARAMETER
STATIC PERFORMANCE
Resolution
Accuracy
Differential Nonlinearity
Gain Error (with internal RFB)(2)
DYNAMIC PERFORMANCE
Current Settling Time(3)
UNITS TEST CONDITIONS/COMMENTS
Bits
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
10-Bit Monotonic, TMIN to TMAX
10-Bit Monotonic, TMIN to TMAX
12-Bit Monotonic, TMIN to TMAX
12-Bit Monotonic, TMIN to TMAX
DAC register loaded with FFFH.
Gain error is adjustable using
the circuits in Figures 2 and 3.
ppm/°C Typical Value is 2ppm/°C
for VDD = +5
∆VDD ± 5%
DB0-DB11 = 0V; WR, CS = 0V
To 1/2 LSB. Out 1 Load = 100Ω
DAC output measured from
falling edge of WR. CS = 0V.
Propagation Delay(3) (from digital input
change to 90% of final analog output)
Glitch Energy
AC Feedback at IOUT 1
All
All
REFERENCE INPUT
Input Resistance (pin 19 to AGND)
All
7
25
7
25
7
25
7
25
kΩ(6)
kΩ
AC OUTPUTS
Output Capacitance(3): COUT 1
COUT 2
All
All
70
200
70
200
70
200
70
200
pF
pF
DB0-DB11 = 0V; WR, CS = 0V
DB0-DB11 = VDD; WR, CS = 0V
DIGITAL INPUTS
VIH (Input HIGH Voltage)
VIL (Input LOW Voltage)
IIN (Input Current)(7)
Input Capacitance(3): DB0-DB11
WR, CS
All
All
All
All
All
2.4
0.8
±1
5
20
2.4
0.8
±10
5
20
13.5
1.5
±1
5
20
13.5
1.5
±10
5
20
V(6)
V
µA
pF
pF
VIN = 0V or VDD
VIN = 0V
VIN = 0V
SWITCHING CHARACTERISTICS(8)
Chip Select to Write Setup Time, tCS
All
All
All
Data Setup Time, tDS
All
Data Hold Time, tDH
All
380
270
0
400
280
210
150
10
180
120
0
160
100
90
60
10
200
150
0
240
170
120
80
10
ns(6)
ns(5)
ns(6)
ns(6)
ns(5)
ns(6)
ns(5)
ns(6)
See Timing Diagram
Chip Select to Write Hold Time, tCH
Write Pulse Width, tWR
280
200
0
250
175
140
100
10
All
All
All
2
100
10
2
500
10
2
100
10
2
500
10
mA
µA
µA(5)
All Digital Inputs VIL or VIH
All Digital Inputs 0V or VDD
All Digital Inputs 0V or VDD
All
ns
Out 1 Load = 100Ω. CEXT = 13pF(4)
nV-s(5) VREF = ACOM
mVp-p(5) VREF = ±10V, 10kHz Sine Wave
Input Resistance TC = 300ppm/°C(5)
tCS ≥ tWR, tCH ≥ 0
POWER SUPPLY, IDD
NOTES: (1) Temperature ranges—J, K, L, and GL: –40°C to +85°C. (2) This includes the effect of 5ppm max, gain TC. (3) Ensured but not tested. (4) DB0-DB11 = 0V
to VDD or VDD to 0V. (5) Typical. (6) Minimum. (7) Logic inputs are MOS gates. Typical input current (+25°C) is less than 1nA. (8) Sample tested at +25°C to ensure
compliance.
DAC7545
SBAS150A
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3
DISCUSSION OF
SPECIFICATIONS
MONOTONICITY
RELATIVE ACCURACY
This term (also known as end point linearity) describes the
transfer function of analog output to digital input code.
Relative accuracy describes the deviation from a straight line
after zero and full-scale have been adjusted.
Monotonicity assures that the analog output will increase
or stay the same for increasing digital input codes. The
DAC7545 is ensured monotonic to 12 bits, except the
J grade is specified to be 10-bit monotonic.
POWER-SUPPLY REJECTION
Power-supply rejection is the measure of the sensitivity of the
output (full-scale) to a change in the power-supply voltage.
DIFFERENTIAL NONLINEARITY
Differential nonlinearity is the deviation from an ideal 1LSB
change in the output, for adjacent input code changes. A
differential nonlinearity specification of 1LSB ensures monotonicity.
GAIN ERROR
Gain error is the difference in measure of full-scale output
versus the ideal DAC output; the ideal output for the DAC7545
is –(4095/4096)(VREF). Gain error can be adjusted to zero
using external trims, see the Applications section.
OUTPUT LEAKAGE CURRENT
The current that appears at OUT 1 with the DAC loaded with
all zeros.
MULTIPLYING FEEDTHROUGH ERROR
The AC output error due to capacitive feedthrough from VREF
to OUT 1 with the DAC loaded with all zeros; this test is
performed using a 10kHz sine wave.
OUTPUT CURRENT SETTLING TIME
CIRCUIT DESCRIPTION
Figure 1 shows a simplified schematic of the DAC portion of
the DAC7545. The current from the VREF pin is switched from
OUT 1 to AGND by the FET switch. This circuit architecture
keeps the resistance at the reference pin constant and equal
to RLDR, so the reference can be provided by either a voltage
or current, AC or DC, positive or negative polarity, and have
a voltage range up to ±20V even with VDD = 5V. The RLDR is
equal to R and is typically 11kW.
The output capacitance of the DAC7545 is code dependent
and varies from a minimum value (70pF) at code 000h to a
maximum (200pF) at code FFFh.
The input buffers are CMOS inverters, designed so that
when the DAC7545 is operated from a 5V supply (VDD), the
logic threshold is TTL-compatible. Being simple CMOS inverters, there is a range of operation where the inverters
operate in the linear region and thus draw more supply
current than normal. Minimizing this transition time through
the linear region and insuring that the digital inputs are
operated as close to the rails as possible will minimize the
supply drain current.
The time required for the output to settle within ±0.5 LSB
of final value from a change in code of all zeros to all ones,
or all ones to all zeros.
R
VREF
R
R
R
PROPAGATION DELAY
2R
The delay of the internal circuitry is measured as the time
from a digital code change to the point at which the
output reaches 90% of final value.
2R
2R
2R
2R
RFB
OUT 1
DIGITAL-TO-ANALOG GLITCH IMPULSE
AGND
The area of the glitch energy measured in nanovolt-seconds.
Key contributions to glitch energy are internal circuitry timing
differences and charge injected from digital
logic. The measurement is performed with VREF = GND,
an OPA600 as the output op amp, and G1 (phase
compensation) = 0pF.
4
DB11
(MSB)
DB10
DB9
DB0
(LSB)
FIGURE 1. Simplified DAC Circuit of the DAC7545.
DAC7545
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SBAS150A
APPLICATIONS
tance. Eliminating this capacitor will result in excessive ringing
and an increase in glitch energy, therefore, this capacitor must
be as small as possible to minimize settling time.
UNIPOLAR OPERATION
Figure 2 shows the DAC7545 connected for unipolar operation. The high-grade DAC7545 is specified for a 1LSB gain
error, so gain adjust is typically not needed; however, the
resistors shown are for adjusting full-scale errors. The value
of R1 should be minimized to reduce the effects of mismatching temperature coefficients between the internal and external resistors. A range of adjustment of 1.5 times the desired
range will be adequate. For example, for a DAC7545JP, the
gain error is specified to be ±25LSB, therefore, a range of
adjustment of ±37LSB will be adequate. Equation 1 results in
a value of 458W for the potentiometer (use 500Ω).
R1 =
RLADDER
(3 • Gain Error)
4096
VDD
VREF
R1
BIPOLAR OPERATION
Figure 3 and Table II illustrate the recommended circuit and
code relationship for bipolar operation. The DAC function uses
offset binary code. The inverter, U1, on the MSB line converts
binary two’s complement input code to offset binary code. If the
inversion is done in software, U1 can be omitted.
(1)
BINARY CODE
RFB
ANALOG OUTPUT
MSB
LSB
1111 1111 1111
1000 0000 0000
0000 0000 0001
0000 0000 0000
R2
+5V
VIN
The circuit of Figure 2 can be used with input voltages up to
±20V as long as the output amplifier is biased to handle the
excursions. Table I represents the analog output for four
codes into the DAC for Figure 2.
C1
33pF
TABLE I. Unipolar Codes.
VOUT
OUT 1
–VIN (4095/4096)
–VIN (2048/4096) = –1/2VIN
–VIN (1/4096)
0V
OPA604
DAC7545 AGND
DGND
DATA INPUT
MSB
LSB
0111 1111 1111
0000 0000 0001
0000 0000 0000
1111 1111 1111
1000 0000 0000
DB0-DB11
FIGURE 2. Unipolar Binary Operation.
R3, R4, and R5 must match within 0.01% and must be the
same type of resistors (preferably wire-wound or metal foil),
so that the temperature coefficients match; mismatch of R3
value to R4 causes both offset and full-scale error. Mismatch
of R5 to R4 and R3 causes full-scale error.
The capacitor across the feedback resistor is used to compensate for the phase shift due to stray capacitances of the circuit
board, the DAC output capacitance, and op amp input capaci-
R2
R4
20kΩ
+5V
18
VDD
19
20
C1
33pF
RFB
OPA604
or
1/2 OPA2604
1
OUT 1
VREF
R1
DAC7545
DB11
DB10-DB0
R3
10kΩ
R5
20kΩ
VOUT
AGND
2
4
11
U1
(see text)
+VIN (2047/2048)
+VIN (1/2048)
0V
–VIN (1/2048)
–VIN (2048/2048)
TABLE II. Binary Two’s Complement Code Table for Circuit
of Figure 3.
The addition of R1 will cause a negative gain error. To
compensate for this error, R2 must be added. The value of R2
should be one-third the value of R1.
VIN
ANALOG OUTPUT
R6
5kΩ 10%
OPA604
or
1/2 OPA2604
Analog Common
12
Data Input
FIGURE 3. Bipolar Operation (binary two’s complement code).
DAC7545
SBAS150A
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5
DIGITALLY-CONTROLLED GAIN BLOCK
Figure 4 shows a circuit for a digitally-controlled gain block.
The feedback for the op amp is made up of the FET switch
and the R-2R ladder. The input resistor to the gain block is
the RFB of the DAC7545. As the FET switch is in the
feedback loop, a zero code into the DAC will result in the op
amp having no feedback, and a saturated op amp output.
VOUT =
–VIN
DB11
2
+
DB10
4
+
DB9
8
+ ••• +
DB0
4096
INTERFACING
TO MICROPROCESSORS
RFB
+5V
16
20
OUT 1
18
19
DAC7545
The DAC7545 can be directly interfaced to either an 8- or 16bit microprocessor through its 12-bit wide data latch using
the CS and WR controls.
AGND
DGND
VOUT
Unused digital inputs must be connected to VDD or to DGND,
this prevents noise from triggering the high impedance digital
input. It is suggested that the unused digital inputs also be
given a path to ground or VDD through a 1mW resistor to
prevent the accumulation of static charge if the PC card is
unplugged from the system. In addition, in systems where
the AGND to DGND connection is on a backplane, it is
recommended that two diodes be connected in inverse
parallel between AGND and DGND.
VIN
DB0-DB11
WR CS
17
reference applications and low-bandwidth requirement; the
OPA37 has low VOS and does not require an offset trim. For
wide bandwidth, high slew rate, or fast-settling applications, the
OPA604 or 1/2 OPA2604 are recommended.
NOTE: There must be
at least 1LSB loaded in
the DAC or the amp will
saturate due to the lack
of feedback.
An 8-bit processor interface is shown in Figure 5. It uses two
memory addresses: one for the lower 8 bits and one for the
upper 4 bits of data into the DAC via the latch.
OPA111
A15
A0
Address Bus
FIGURE 4. Digitally Controlled Gain Block.
Address
Decode
APPLICATION HINTS
CMOS DACs, such as the DAC7545, exhibit a code-dependent out resistance. The effect of this is a code-dependent
differential nonlinearity at the amplifier output that depends on
the offset voltage, VOS, of the amplifier. Thus linearity depends
upon the potential of OUT 1 and AGND being exactly equal to
each other. Usually the DAC is connected to an external op
amp with the noninverting input connected to AGND. The op
amp selected should have a low input bias current and low VOS
and VOS drift over temperature. The op amp offset voltage
should be less than (25 • 10–6)(VREF) over operating conditions.
Suitable op amps are the OPA37 and the OPA627 for fixed
6
CPU
Q0(1)
CS
CS
Q1(2)
4
Latch 4
DB11
DB8
DAC7545
WR
WR
WR
8
DB7
DB0
DB7
DB0
8-Bit Data Bus
NOTES: (1) Q0 = decoded address for DAC.
(2) Q1 = decoded address for latch.
FIGURE 5. 8-Bit Processor Interface.
DAC7545
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SBAS150A
PACKAGE OPTION ADDENDUM
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11-Apr-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Top-Side Markings
(3)
(4)
DAC7545GLP
OBSOLETE
ZZ (BB)
ZZ222
20
TBD
Call TI
Call TI
-40 to 85
DAC7545GLU
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545GLU
DAC7545GLUG4
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545GLU
DAC7545JP
OBSOLETE
ZZ (BB)
ZZ222
20
TBD
Call TI
Call TI
-40 to 85
DAC7545JU
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545JU
DAC7545JUG4
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545JU
DAC7545KP
OBSOLETE
ZZ (BB)
ZZ222
20
TBD
Call TI
Call TI
-40 to 85
DAC7545KU
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545KU
DAC7545KUG4
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545KU
DAC7545LP
OBSOLETE
ZZ (BB)
ZZ222
20
TBD
Call TI
Call TI
-40 to 85
DAC7545LU
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545LU
DAC7545LUG4
NRND
SOIC
DW
20
25
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 85
DAC7545LU
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
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11-Apr-2013
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a
continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
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Addendum-Page 2
®
PACKAGE DRAWING
MPDI046
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