All data sheets are subject to change without notice

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12-Bit Buffered Multiplying

7545A

Digital to Analog Converter

02.05.02 Rev 4

REF

DGND

AGND

OUT1

DB11-DBO

INPUT DATA LATCHES

DAC

12-BIT MULTIPYING

FEATURES:

•RAD-PAK® patented shielding against natural space radia-

tion

• Total dose hardness:

- > 100 krad (Si), depending upon space mission

• Excellent single event effects

- SEL

: > 120 MeV/mg/cm

- SEU

: > 120 MeV/mg/cm

using all 1’s

• Package:

- 20 pin R

AD-PAK® Flat Pack

- 20 pin R

AD-PAK® 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 mul-

tiplying 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 par-

ticularly suitable for single supply operations and applications

with wide temperature variations.

Maxwell Technologies' patented R

AD-PAK® 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-PAK provides greater than 100

krad (Si) radiation dose tolerance. This product is available

with screening up to Class S.

All data sheets are subject to change without notice

12-Bit Buffered Multiplying

Digital to Analog Converter

7545A

02.05.02 Rev 4

TABLE 1. 7545A PINOUT DESCRIPTION

PIN SYMBOL DESCRIPTION

1 OUT 1 Output Current

2 AGND Analog Ground

3 DGND Digital Ground

4 DB 11 Data Bit 11 (MSB)

5 DB 10 Data Bit 10

6 DB 9 Data Bit 9

7 DB 8 Data Bit 8

8 DB 7 Data Bit 7

9 DB 6 Data Bit 6

10 DB 5 Data Bit 5

11 DB 4 Data Bit 4

12 DB 3 Data Bit 3

13 DB 2 Data Bit 2

14 DB 1 Data Bit 1

15 DB 0 Data Bit 0 (LSB)

16 CS

Chip Select (Active Low)

17 WR

Write (Active Low)

18 V

Digital Supply Voltage

19 V

REF

Reference Input

20 RFB Feedback Resistance

TABLE 2. 7545A ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL MIN MAX UNIT

to DGND -- -0.3 17 V

Digital Input Voltage to DGND -- -0.3 V

+ 0.3 V

RFB

, V

REF

to DGND -- -- 25 V

PIN1

to DGND -- -0.3 V

+ 0.3 V

AGND to DGND -- -0.3 V

+ 0.3 V

Power Dissipation to 75

-- 450 mW

Thermal Impedance — Flat Package

-- 6.08 °C/W

Thermal Impedance — DIP Package

-- 6.04 °C/W

Operating Temperature -- -55 125

Storage Temperature Range T

-65 150

All data sheets are subject to change without notice

12-Bit Buffered Multiplying

Digital to Analog Converter

7545A

02.05.02 Rev 4

TABLE 3. DELTA LIMITS

PARAMETER VARIATION

±10%

TABLE 4. 7545A SPECIFICATIONS

= +5 V ±10%, T

= -55 TO 125

C UNLESS OTHERWISE NOTED)

TEST SYMBOL TEST CONDITION MIN MAX UNIT

Resolution RES 12 -- Bits

Relative Accuracy RA -1/2 1/2 LSB

Differential Nonlinearity DNL 12-Bit Monotonic T

MIN

to T

MAX

-1 1 LSB

Gain Error

1. Measured using feedback resistor.

DAC Register Loaded with 1111

1111 1111

-4 4 LSB

Gain Temperature Coefficient

2. Guaranteed by design.

-5 5 ppm/

Power Supply Rejection PSRR V

= 5% -0.004 0.004 %/%

Output Current Settling Time

To 1/2LSB; OUT1 Load = 100Ω,

DAC Output Measured from Fall-

ing Edge of WR

. CS = 0V

-- 2 µs

Feed through Error FT 5 (typical) mV p-p

Reference Input Resistance (Pin

19 to Ground)

10 25 KΩ

Digital Input High Voltage V

2.4 -- V

Digital Input Low Voltage V

-- 0.8 V

Digital Input Leakage Current I

= 0 V or V

-10 10 µA

Digital Input Capacitance

DB0 - DB11; WR, CS -- 20 pF

Output Capacitance

OUT1

DB0 - DB11 = 0 V, WR, CS = 0V -- 70 pF

DB0 - DB11 = V

, WR, CS = 0V -- 200

Chip Select to Write Setup Time

3. Not Tested.

> t

, t

> 0 380 -- nS

Chip Select to Write Hold Time

0--

Write Pulse Width

400 --

Data Setup Time

210 --

Data Hold Time

10 --

Supply Current from V

All Digital Inputs V

or V

-- 2 mA

All Digital Inputs 0 or V

-- 500 µA

Part #	7545ARPFE
Description
Category	IC
Availability	In Stock
Qty	3

7545ARPFE

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