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All data sheets are subject to change without notice

(858) 503-3300- Fax: (858) 503-3301- www.maxwell.com

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

EATURES

· R

-P

® 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

-P

® Flat Pack

- 20 pin R

-P

® DIP

· Low gain temperature coefficient:

- 5 ppm/

C typ.

· Fast interface timing
· Single +5 V to +15 V supply

ESCRIPTION

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

-P

® 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

-P

provides greater than 100

krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.

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All data sheets are subject to change without notice

12-Bit Buffered Multiplying
Digital to Analog Converter

7545A

02.05.02 Rev 4

ABLE

1. 7545A P

INOUT

ESCRIPTION

YMBOL

ESCRIPTION

OUT 1

Output Current

AGND

Analog Ground

DGND

Digital Ground

DB 11

Data Bit 11 (MSB)

DB 10

Data Bit 10

DB 9

Data Bit 9

DB 8

Data Bit 8

DB 7

Data Bit 7

DB 6

Data Bit 6

DB 5

Data Bit 5

DB 4

Data Bit 4

DB 3

Data Bit 3

DB 2

Data Bit 2

DB 1

Data Bit 1

DB 0

Data Bit 0 (LSB)

16 CS

Chip Select (Active Low)

Write (Active Low)

Digital Supply Voltage

REF

Reference Input

RFB

Feedback Resistance

ABLE

2. 7545A A

BSOLUTE

AXIMUM

ATINGS

ARAMETER

YMBOL

NIT

to DGND

-0.3

Digital Input Voltage to DGND

-0.3

+ 0.3

RFB

, V

REF

to DGND

PIN1

to DGND

-0.3

+ 0.3

AGND to DGND

-0.3

+ 0.3

Power Dissipation to 75

450

Thermal Impedance -- Flat Package

6.08

°C/W

Thermal Impedance -- DIP Package

6.04

°C/W

Operating Temperature

-55

125

Storage Temperature Range

-65

150

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All data sheets are subject to change without notice

12-Bit Buffered Multiplying
Digital to Analog Converter

7545A

02.05.02 Rev 4

ABLE

3. D

ELTA

IMITS

ARAMETER

ARIATION

±10%

ABLE

4. 7545A S

PECIFICATIONS

= +5 V ±10%, T

= -55

125

UNLESS

OTHERWISE

NOTED

)

EST

YMBOL

EST

ONDITION

NIT

Resolution

RES

Bits

Relative Accuracy

-1/2

1/2

LSB

Differential Nonlinearity

DNL

12-Bit Monotonic T

MIN

to T

MAX

-1

LSB

Gain Error

1. Measured using feedback resistor.

DAC Register Loaded with 1111
1111 1111

-4

LSB

Gain Temperature Coefficient

2. Guaranteed by design.

-5

ppm/

Power Supply Rejection

PSRR

= 5%

-0.004

0.004

%/%

Output Current Settling Time

To 1/2LSB; OUT1 Load = 100

DAC Output Measured from Fall-
ing Edge of WR. CS = 0V

µ s

Feed through Error

5 (typical)

mV p-p

Reference Input Resistance (Pin
19 to Ground)

Digital Input High Voltage

2.4

Digital Input Low Voltage

0.8

Digital Input Leakage Current

= 0 V or V

-10

µ A

Digital Input Capacitance

DB0 - DB11; WR, CS

Output Capacitance

OUT1

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

DB0 - DB11 = V

, WR, CS = 0V

200

Chip Select to Write Setup Time

3. Not Tested.

> t

, t

> 0

380

Chip Select to Write Hold Time

Write Pulse Width

400

Data Setup Time

210

Data Hold Time

Supply Current from V

All Digital Inputs V

or V

All Digital Inputs 0 or V

500

µ A

e
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y

All data sheets are subject to change without notice

12-Bit Buffered Multiplying
Digital to Analog Converter

7545A

02.05.02 Rev 4

ABLE

5. 7545A S

PECIFICATIONS

= +15 V ±10%, T

= -55

125

UNLESS

OTHERWISE

NOTED

)

EST

YMBOL

EST

ONDITION

NIT

Relative Accuracy

-1/2

1/2

LSB

Differential Nonlinearity

DNL

12-Bit Monotonic T

MIN

to T

MAX

-1

LSB

Gain Error

1. Measured using feedback resistor.

DAC Register Loaded with 1111
1111 1111

-4

LSB

Gain Temperature Coefficient

2. Guaranteed by design.

-5

ppm/

Power Supply Rejection

PSRR

= 5%

-0.004

0.004

%/%

Output Current Settling Time

To 1/2LSB; OUT1 Load = 100

DAC Output Measured from Fall-
ing Edge of WR. CS = 0V

µ s

Feed through Error

5 (typical)

mV p-p

Reference Input Resistance (Pin
19 to Ground)

Digital Input High Voltage

13.5

Digital Input Low Voltage

1.5

Digital Input Leakage Current

= 0 V or V

-10

µ A

Digital Input Capacitance

DB0 - DB11; WR, CS

Output Capacitance

OUT1

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

DB0 - DB11 = V

, WR, CS = 0V

150

Chip Select to Write Setup Time

> t

, t

> 0

Chip Select to Write Hold Time

Write Pulse Width

Data Setup Time

Data Hold Time

Supply Current from V

All Digital Inputs V

or V

All Digital Inputs 0 or V

100

µ A

e
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y

All data sheets are subject to change without notice

12-Bit Buffered Multiplying
Digital to Analog Converter

7545A

02.05.02 Rev 4

IGURE

1. W

RITE

YCLE

IMING

IAGRAM

IGURE

2. M

ODE

ELECTION

ABLE

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.

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