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7545A
12-Bit Buffered Multiplying Digital to Analog Converter
R FB R V REF 12-BIT MULTIPYING DAC 12 WR CS INPUT DATA LATCHES 12 DB11-DBO V DD DGND OUT1 AGND
Memory
FEATURES:
* RAD-PAK(R) patented shielding against natural space radiation * Total dose hardness: - > 100 krad (Si), depending upon space mission * Excellent single event effects - SELTH: > 120 MeV/mg/cm2 - SEUTH: > 120 MeV/mg/cm2 using all 1's * Package: - 20 pin RAD-PAK(R) Flat Pack - 20 pin RAD-PAK(R) DIP * Low gain temperature coefficient: - 5 ppm/ C typ. * Fast interface timing * Single +5 V to +15 V supply
DESCRIPTION:
Maxwell Technologies' 7545A is a 12-bit CMOS-buffered multiplying DAC with internal data latches, which features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. The 7545A features a WR pulse width of 100 ns which allows interfacing to a much wider range of fast 8-bit and 16-bit microprocessors. It is loaded by a single 12-bit wide word under the control of the CS and WR inputs; tying these control inputs low makes the input latches transparent allowing unbuffered operation of the DAC. The 7545A is particularly suitable for single supply operations and applications with wide temperature variations. Maxwell Technologies' patented RAD-PAK(R) 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.
02.05.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
TABLE 1. 7545A PINOUT DESCRIPTION
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 SYMBOL OUT 1 AGND DGND DB 11 DB 10 DB 9 DB 8 DB 7 DB 6 DB 5 DB 4 DB 3 DB 2 DB 1 DB 0 CS WR VDD VREF RFB DESCRIPTION Output Current Analog Ground Digital Ground Data Bit 11 (MSB) Data Bit 10 Data Bit 9 Data Bit 8 Data Bit 7 Data Bit 6 Data Bit 5 Data Bit 4 Data Bit 3
7545A
Memory
Data Bit 2 Data Bit 1 Data Bit 0 (LSB) Chip Select (Active Low) Write (Active Low) Digital Supply Voltage Reference Input Feedback Resistance
TABLE 2. 7545A ABSOLUTE MAXIMUM RATINGS
PARAMETER VDD to DGND Digital Input Voltage to DGND VRFB, VREF to DGND VPIN1 to DGND AGND to DGND Power Dissipation to 75
C
SYMBOL -----PD
MIN -0.3 -0.3 --0.3 -0.3 ----55 -65
MAX 17 VDD + 0.3 25 VDD + 0.3 VDD + 0.3 450 6.08 6.04 125 150
UNIT V V V V V mW C/W C/W
C C
Thermal Impedance -- Flat Package Thermal Impedance -- DIP Package Operating Temperature Storage Temperature Range
JC JC
-TS
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
TABLE 3. DELTA LIMITS
PARAMETER IDD VARIATION 10%
7545A
TABLE 4. 7545A SPECIFICATIONS
(VDD = +5 V 10%, TA = -55 TO 125 C UNLESS OTHERWISE NOTED) TEST Resolution Relative Accuracy Differential Nonlinearity Gain Error 1 Gain Temperature Coefficient2 Power Supply Rejection Output Current Settling Time2 SYMBOL RES RA DNL AE TCAE PSRR tSL VDD = 5% To 1/2LSB; OUT1 Load = 100, DAC Output Measured from Falling Edge of WR. CS = 0V 12-Bit Monotonic TMIN to TMAX DAC Register Loaded with 1111 1111 1111 TEST CONDITION MIN 12 -1/2 -1 -4 -5 -0.004 -MAX -1/2 1 4 5 0.004 2 UNIT Bits LSB LSB LSB ppm/ C
Memory
%/% s
Feed through Error Reference Input Resistance (Pin 19 to Ground)2 Digital Input High Voltage Digital Input Low Voltage Digital Input Leakage Current Digital Input Capacitance2 Output Capacitance2
FT RIN VIH VIL IIN CIN COUT1 tCS tCH tWR tDS tDH IDD All Digital Inputs VIL or VIH All Digital Inputs 0 or VDD VIN = 0 V or VDD DB0 - DB11; WR, CS DB0 - DB11 = 0 V, WR, CS = 0V DB0 - DB11 = VDD, WR, CS = 0V 10 2.4 --10 ---380 0 400 210 10 ---
5 (typical) 25 -0.8 10 20 70 200 -----2 500
mV p-p K V V A pF pF
Chip Select to Write Setup Time3 Chip Select to Write Hold Time3 Write Pulse Width3 Data Setup Time3 Data Hold Time3 Supply Current from VDD
tCS > tWR, tCH > 0
nS
mA A
1. Measured using feedback resistor. 2. Guaranteed by design. 3. Not Tested.
02.05.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
TABLE 5. 7545A SPECIFICATIONS
(VDD = +15 V 10%, TA = -55 TO 125 C UNLESS OTHERWISE NOTED) TEST Relative Accuracy Differential Nonlinearity Gain Error 1 Gain Temperature Coefficient2 Power Supply Rejection Output Current Settling Time2 SYMBOL RA DNL AE TCAE PSRR tSL VDD = 5% To 1/2LSB; OUT1 Load = 100, DAC Output Measured from Falling Edge of WR. CS = 0V 12-Bit Monotonic TMIN to TMAX DAC Register Loaded with 1111 1111 1111 TEST CONDITION MIN -1/2 -1 -4 -5 -0.004 -MAX 1/2 1 4 5 0.004 2
7545A
UNIT LSB LSB LSB ppm/ C %/% s
Feed through Error Reference Input Resistance (Pin 19 to Ground)2 Digital Input High Voltage Digital Input Low Voltage Digital Input Leakage Current Digital Input Capacitance2 Output Capacitance2
FT RIN VIH VIL IIN CIN COUT1 tCS tCH tWR tDS tDH IDD All Digital Inputs VIL or VIH All Digital Inputs 0 or VDD VIN = 0 V or VDD DB0 - DB11; WR, CS DB0 - DB11 = 0 V, WR, CS = 0V DB0 - DB11 = VDD, WR, CS = 0V 10 13.5 --10 ---95 0 95 80 5 ---
5 (typical) 25 -1.5 10 15 70 150 -----2 100
mV p-p K
Memory
V V A pF pF
Chip Select to Write Setup Time Chip Select to Write Hold Time Write Pulse Width3 Data Setup Time3 Data Hold Time3 Supply Current from VDD
tCS > tWR, tCH > 0
nS
mA A
1. Measured using feedback resistor. 2. Guaranteed by design.
02.05.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
FIGURE 1. WRITE CYCLE TIMING DIAGRAM
7545A
FIGURE 2. MODE SELECTION TABLE
Memory
MODE SELECTION WRITE MODE: CS and WR low, DAC responds to data bus (DB0 - DB11) inputs HOLD MODE: Either CS or WR high, data bus (DB0 DB11) is locked out; DAC holds last data present when WR or CS assumed high state.
02.05.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
7545A
Memory
20 PIN RAD-PAK(R) DUAL IN LINE PACKAGE
SYMBOL MIN A b b2 c D E eA eA/2 e L Q S1 S2 N 0.125 0.015 0.005 0.005 -0.014 0.045 0.008 -0.220 DIMENSION NOM 0.202 0.018 0.050 0.010 1.000 0.290 0.300 BSC 0.150 BSC 0.100 BSC 0.145 0.045 0.025 -20 0.155 0.070 --MAX 0.230 0.026 0.065 0.018 1.060 0.310
D20-01 Note: All dimensions in inches
02.05.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
7545A
Memory
20 PIN RAD-PAK(R) FLAT PACKAGE
SYMBOL MIN A b c D E E1 E2 E3 e L Q S1 N 0.350 0.026 0.005 0.128 0.015 0.003 0.470 0.287 -0.155 0.030 DIMENSION NOM 0.141 0.017 0.005 0.480 0.295 -0.160 0.068 0.050 BSC 0.380 0.034 0.007 20 0.390 0.045 -MAX 0.154 0.022 0.009 0.490 0.303 0.333 ---
F20-01 Note: All dimensions in inches
02.05.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
Important Notice:
7545A
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
02.05.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
12-Bit Buffered Multiplying Digital to Analog Converter
Product Ordering Options
7545A
Model Number
7545A
RP
F
X
Feature
Option Details
Screening Flow
S = Maxwell Class S B = Maxwell Class B E = Engineering (testing @ +25C) I = Industrial (testing @ -55C, +25C, +125C)
Memory
Package
D = Dual In-line Package (DIP) F = Flat Pack
Radiation Feature
RP = RAD-PAK(R) package
Base Product Nomenclature
12-Bit Buffered Multiplying Digital to Analog Converter
02.05.02 Rev 4
All data sheets are subject to change without notice
9
(c)2001 Maxwell Technologies All rights reserved.

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