LTC7545ACSW#TRPBF - Linear Technology

LTC7545A

Improved Industry Standard

Parallel 12-Bit Multiplying DAC

FEATURE

ESCRIPTIO

The LTC

7545A is a 12-bit multiplying digital-to-analog

converter (DAC) with a microprocessor compatible paral-

lel input. It is a superior pin compatible replacement for the

industry standard AD7545A and AD7545. Improvements

include better accuracy, better stability over temperature

and supply variations and lower sensitivity to output

amplifier offset.

This very versatile DAC is useful for 2-quadrant and

4-quadrant multiplying, programmable gain and filtering

and single supply noninverting voltage output operation.

Parts are available in 20-pin PDIP and SO packages and

commercial and industrial temperature grades.

■

Improved Direct Replacement for AD7545A

and AD7545

■

DNL and INL Over Temperature: ±0.5LSB

■

Gain Error: ±1LSB Maximum

■

4-Quadrant Multiplication

■

Single 5V or 15V Supply

■

Low Power Consumption

■

Low Cost

■

Process Control and Industrial Automation

■

Software Controlled Gain Adjustment

■

Digitally Controlled Filter and Power Supplies

■

Automatic Test Equipment

PPLICATI

, LTC and LT are registered trademarks of Linear Technology Corporation.

PPLICATITYPICAL

2-Quadrant Multiplying DAC Has Less Than

0.5LSB (Typ) Total Unadjusted Error

REF

LTC7545A

DGND

34–15

16 2

19 20

OUT1

33pF

OUT

7545A TA01

AGND

–

0.1µF

1097

DIGITAL INPUT CODE

INTEGRAL NONLINEARITY (LSB)

4095

7545A TA02

1024 2048 3072

1.0

0.5

–0.5

–1.0 512 1536 2560 3584

= 85°CT

= 25°C

= –40°C

Integral Nonlinearity Over Temperature

LTC7545A

PACKAGE/ORDER I FOR ATIO

ARBSOLUTEXI T

to AGND ............................................ –0.5V to 17V

to DGND .............................................–0.5V to 17V

AGND to DGND.............................. –0.5V to V

+ 0.5V

DGND to AGND.............................. –0.5V to V

+ 0.5V

REF

to AGND,DGND ............................................. ±25V

to AGND,DGND ............................................. . ±25V

Digital Inputs to DGND ................. –0.5V to V

+ 0.5V

OUT1

to AGND, DGND ................. –0.5V to V

+ 0.5V

Maximum Junction Temperature ..........................150°C

Operating Temperature Range

Commercial (K, L Versions) .................... 0°C to 70°C

Industrial (B, C Versions)................... –40° C to 85°C

Storage Temperature Range ................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300°C

LTC7545ABG

LTC7545ABN

LTC7545ABSW

LTC7545ACG

LTC7545ACN

LTC7545ACSW

LTC7545AKG

LTC7545AKN

LTC7545AKSW

LTC7545ALG

LTC7545ALN

LTC7545ALSW

ORDER PART

NUMBER

JMAX

= XXX°C, θ

= XXX°C/W (G)

JMAX

= 150°C, θ

= 100°C/W (N)

JMAX

= 150°C, θ

= 130°C/W (SW)

Consult factory for Military grade parts.

VDD = 5V or 15V, VREF = 10V, VOUT1 = AGND = 0V, TA = TMIN to TMAX, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

LTC7545AK/AB LTC7545AL/AC

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

Accuracy

Resolution ●12 12 Bits

INL Integral Nonlinearity (Note 1) T

= 25°C±0.5 ±0.5 LSB

(Relative Accuracy) T

MIN

to T

MAX

●±0.5 ±0.5 LSB

DNL Differential Nonlinearity Guaranteed Monotonic T

= 25°C±1±0.5 LSB

MIN

to T

MAX

MIN

to T

MAX

●±1±0.5 LSB

GE Gain Error (Note 2) T

= 25°C±2±1LSB

MIN

to T

MAX

●±3±2LSB

Gain Temperature Coefficient (Note 3) ∆Gain/∆Temperature ●1 5 1 5 ppm/°C

LKG

OUT1 Leakage Current (Note 4) T

= 25°C±10 ±10 nA

MIN

to T

MAX

●±50 ±50 nA

PSRR Power Supply Rejection ●±0.002 ±0.002 %/%

Reference Input

REF

Input Resistance (Note 5) ●8 11 15 8 11 15 kΩ

AC Performance

Output Current Settling Time (Notes 3, 6, 7) ●11µs

Propagation Delay (Notes 3, 6, 8) ●150 150 ns

Digital-to-Analog Glitch Impulse (Notes 6, 9) ●5 5 nV-sec

Multiplying Feedthrough Error V

REF

= ±10V, 10kHz Sine Wave ●55mV

P-P

Analog Outputs

OUT

Output Capacitance (Note 3) DB0 to DB11 = 0V, C

OUT1

●30 70 30 70 pF

WR, CS = 0V

DB0 to DB11 = V

DD,

OUT1

●60 150 60 150 pF

WR, CS = 0V

OUT1

AGND

DGND

DB11 (MSB)

DB10

DB9

DB8

DB7

DB6

DB5

RFB

VREF

VDD

DB0 (LSB)

DB1

DB2

DB3

DB4

TOP VIEW

N PACKAGE

20-LEAD PDIP

SW PACKAGE

20-LEAD PLASTIC SO WIDE

G PACKAGE

20-LEAD PLASTIC SSOP

LTC7545A

ELECTRICAL CHARACTERISTICS

VDD = 5V, VREF = 10V, VOUT1 = AGND = 0V, TA = TMIN to TMAX, unless otherwise noted.

ALL GRADES

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Digital Inputs

Digital Input High Voltage ●2.4 V

Digital Input Low Voltage ●0.8 V

Digital Input Current ●0.001 ±1µA

Digital Input Capacitance (Note 3) V

= 0V ●8pF

Timing Characteristics (Note 3)

CS to WR Setup Time ●100 ns

CS to WR Hold Time ●0ns

Write Pulse Width ●100 ns

Data Setup Time ●100 ns

Data Hold Time ●5ns

Power Supply

Supply Voltage ●4.75 5 5.25 V

Supply Current All Digital Inputs = V

or V

●2mA

All Digital Inputs = 0V or V

●10 100 µA

VDD = 15V, VREF = 10V, VOUT1 = AGND = 0V, TA = TMIN to TMAX, unless otherwise noted.

The ● denotes specificatons which apply over the full operating

temperature range.

Note 1: ±0.5LSB = ±0.012% of full scale.

Note 2: Using internal feedback resistor.

Note 3: Guaranteed by design, not subject to test.

Note 4: I

OUT1

with DAC register loaded to all 0s.

Note 5: Typical temperature coefficient is 100ppm/°C.

Note 6: OUT1 load = 100Ω in parallel with 13pF.

Note 7: To 0.01% for a full-scale change, measured from the falling

edge of WR, CS = 0V.

Note 8: From digital input change to 90% of final analog output.

Note 9: V

REF

= 0V. DAC register contents changed from all 0s to all 1s

or all 1s to all 0s.

ALL GRADES

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Digital Inputs

Digital Input High Voltage ●13.5 V

Digital Input Low Voltage ●1.5 V

Digital Input Current ●±1µA

Digital Input Capacitance (Note 3) V

= 0V ●8pF

Timing Characteristics (Note 3)

CS to WR Setup Time ●75 ns

CS to WR Hold Time ●0ns

Write Pulse Width ●75 ns

Data Setup Time ●60 ns

Data Hold Time ●5ns

Power Supply

Supply Voltage ●14.25 15 15.75 V

Supply Current All Digital Inputs = V

or V

●2mA

All Digital Inputs = 0V or V

●10 100 µA

LTC7545A

40k 10k

40k

20k

40k

20k

40k

20k

40k40k40k

DECODER

LOAD

REF

OUT1

AGND

DGND3

7545A BD

INPUT DATA LATCHES

45 67 15

DB11

(MSB) DB10 DB9 DB8

• • • • • • •

DB0

(LSB)

BLOCK DIAGRAM

TI I G DIAGRA

UWW

DATA VALID

DATA IN

DB0 to DB11

7545A TD

LTC7545A

TYPICAL APPLICATIONS N

Unipolar Operation (2-Quadrant Multiplication)

ANALOG OUTPUT

VOUT

MSB LSB

1111 1111 1111 –VREF (4095/4096)

1000 0000 0000 –VREF (2048/4096) = –VREF/2

0000 0000 0001 –VREF (1/4096)

0000 0000 0000 0V

DIGITAL INPUT

BINARY NUMBER

IN DAC LATCH

Table 1. Unipolar Binary Code Table

REF

LTC7545A

OUT1

DGND

AGND

4–15

5V OR 15V

REF

–10V TO 10V

µP

DB11 to DB0

19 20

33pF

0.1µF

OUT

0V TO – V

REF

7545A TA03

–

LT1097

LTC7545A

TYPICAL APPLICATIONS N

Bipolar Operation (4-Quadrant Multiplication)

REF

LTC7545A

OUT1

DGND

AGND

4–15

5V OR 15V

REF

–10V TO 10V

µP

DB11–DB0

19 20

33pF

10K

0.1µF

OUT

7545A TA04

–

1/2LT1112

–

1/2LT1112

20K R3

20K

ANALOG OUTPUT

VOUT

Table 2. Bipolar Offset Binary Code Table

MSB LSB

1111 1111 1111 VREF (2047/2048)

1000 0000 0001 VREF (1/2048)

1000 0000 0000 0V

0111 1111 1111 –VREF (1/2048)

0000 0000 0000 –VREF (2048/2048) = –VREF

DIGITAL INPUT

BINARY NUMBER

IN DAC LATCH

LTC7545A

PACKAGE DESCRIPTION

Dimensions in inches (millimeters) unless otherwise noted.

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

N Package

20-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

G Package

20-Lead Plastic SSOP (0.209)

(LTC DWG # 05-08-1640)

G20 SSOP 1098

0.13 – 0.22

(0.005 – 0.009)

0° – 8°

0.55 – 0.95

(0.022 – 0.037)

5.20 – 5.38**

(0.205 – 0.212)

7.65 – 7.90

(0.301 – 0.311)

12345678910

7.07 – 7.33*

(0.278 – 0.289)

1718 14 13 12 1115161920

1.73 – 1.99

(0.068 – 0.078)

0.05 – 0.21

(0.002 – 0.008)

0.65

(0.0256)

BSC 0.25 – 0.38

(0.010 – 0.015)

NOTE: DIMENSIONS ARE IN MILLIMETERS

DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.152mm (0.006") PER SIDE

DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.254mm (0.010") PER SIDE

N20 1098

0.020

(0.508)

MIN

0.125

(3.175)

MIN

0.130 ± 0.005

(3.302 ± 0.127)

0.065

(1.651)

TYP

0.045 – 0.065

(1.143 – 1.651)

0.018 ± 0.003

(0.457 ± 0.076)

0.005

(0.127)

MIN

0.100

(2.54)

BSC

0.255 ± 0.015*

(6.477 ± 0.381)

1.040*

(26.416)

MAX

12345678910

19 1112

131416 1517

0.009 – 0.015

(0.229 – 0.381)

0.300 – 0.325

(7.620 – 8.255)

0.325 +0.035

–0.015

+0.889

–0.381

8.255

()

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

LTC7545A

sn7545a 7545afs LT/GP 0596 10K • PRINTED IN USA

 LINEAR TECHNOLOGY C ORPORATION 1996

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900

●

FAX

: (408) 434-0507

●

TELEX

: 499-3977

PACKAGE DESCRIPTION

Dimensions in inches (millimeters) unless otherwise noted.

RELATED PARTS

PART NUMBER DESCRIPTON COMMENTS

LTC1257 Complete Serial I/O V

OUT

12-Bit DAC 5V to 15V Single Supply in 8-Pin SO and PDIP

LTC1450/LTC1450L Complete Parallel Input V

OUT

12-Bit DACs Rail-to-Rail V

OUT

, 3V/5V Single Supply, 12-Bit or (8 + 4) Bit Loading

LTC1451/LTC1452/LTC1453 Complete Serial I/O V

OUT

12-Bit DACs Rail-to-Rail V

OUT

, 3V/5V Single Supply in 8-Pin SO and PDIP

LTC7541A Parallel I/O Multiplying I

OUT

12-Bit DAC 12-Bit Wide Parallel Input

LTC7543/LTC8143 Serial I/O Multiplying I

OUT

12-Bit DACs Clear Pin and Serial Data Output (LTC8143)

LTC8043 Serial I/O Multiplying I

OUT

12-Bit DAC 8-Pin SO and PDIP

SW Package

20-Lead Plastic Small Outline (Wide 0.300)

(LTC DWG # 05-08-1620)

S20 (WIDE) 1098

NOTE 1

0.496 – 0.512*

(12.598 – 13.005)

20 19 18 17 16 15 14 13

12345678

0.394 – 0.419

(10.007 – 10.643)

910

1112

0.037 – 0.045

(0.940 – 1.143)

0.004 – 0.012

(0.102 – 0.305)

0.093 – 0.104

(2.362 – 2.642)

0.050

(1.270)

BSC 0.014 – 0.019

(0.356 – 0.482)

TYP

0° – 8° TYP

NOTE 1

0.009 – 0.013

(0.229 – 0.330) 0.016 – 0.050

(0.406 – 1.270)

0.291 – 0.299**

(7.391 – 7.595)

× 45°

0.010 – 0.029

(0.254 – 0.737)

NOTE:

1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.

THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE