Datasheet

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LTC7545A

Improved Industry Standard

Parallel 12-Bit Multiplying DAC

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

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

ITY

2-Quadrant Multiplying DAC Has Less Than

0.5LSB (Typ) Total Unadjusted Error

REF

LTC7545A

DGND

34–15

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°C

= 25°C

= –40°C

Integral Nonlinearity Over Temperature

Summary of content (8 pages)

PAGE 1
LTC7545A Improved Industry Standard Parallel 12-Bit Multiplying DAC U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ The LTC ® 7545A is a 12-bit multiplying digital-to-analog converter (DAC) with a microprocessor compatible parallel 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.
PAGE 2
LTC7545A W U U W W W AXI U U ABSOLUTE PACKAGE/ORDER I FOR ATIO RATI GS VDD to AGND ............................................ –0.5V to 17V VDD to DGND ............................................. –0.5V to 17V AGND to DGND .............................. –0.5V to VDD + 0.5V DGND to AGND .............................. –0.5V to VDD + 0.5V VREF to AGND,DGND ............................................. ±25V RFB to AGND,DGND ............................................. .
PAGE 3
LTC7545A ELECTRICAL CHARACTERISTICS VDD = 5V, VREF = 10V, VOUT1 = AGND = 0V, TA = TMIN to TMAX, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN ALL GRADES TYP MAX UNITS Digital Inputs VIH Digital Input High Voltage ● VIL Digital Input Low Voltage ● IIN Digital Input Current CIN Digital Input Capacitance 2.4 0.001 ● (Note 3) VIN = 0V V ● 0.
PAGE 4
LTC7545A W BLOCK DIAGRAM 20k 20k 20k VREF 19 20 RFB 40k 40k 40k 40k 40k 40k 40k 10k 1 OUT1 2 AGND VDD 18 DECODER 3 DGND WR 17 LOAD INPUT DATA LATCHES CS 16 4 5 6 7 DB11 (MSB) DB10 DB9 DB8 • • • • • • • 15 DB0 (LSB) WU W TI I G DIAGRA tCS tCH CS tWR WR tDS DATA IN DB0 to DB11 tDH DATA VALID 7545A TD 4 7545A BD
PAGE 5
LTC7545A U TYPICAL APPLICATIONS N Unipolar Operation (2-Quadrant Multiplication) VREF –10V TO 10V 5V OR 15V 0.1µF 19 18 20 VDD VREF RFB 17 16 µP WR CS LTC7545A DB11 to DB0 4–15 OUT1 AGND DGND 3 33pF 1 – 2 + LT1097 VOUT 0V TO – VREF 7545A TA03 Table 1.
PAGE 6
LTC7545A U TYPICAL APPLICATIONS N Bipolar Operation (4-Quadrant Multiplication) VREF –10V TO 10V R2 20K R3 20K 5V OR 15V 0.1µF 19 18 20 VDD VREF RFB 17 16 µP WR CS LTC7545A OUT1 AGND DGND 3 DB11–DB0 4–15 33pF – 1 2 R1 10K 1/2LT1112 + – 1/2LT1112 VOUT + 7545A TA04 Table 2.
PAGE 7
LTC7545A U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. G Package 20-Lead Plastic SSOP (0.209) (LTC DWG # 05-08-1640) 7.07 – 7.33* (0.278 – 0.289) 20 19 18 17 16 15 14 13 12 11 7.65 – 7.90 (0.301 – 0.311) 1 2 3 4 5 6 7 8 9 10 5.20 – 5.38** (0.205 – 0.212) 1.73 – 1.99 (0.068 – 0.078) 0° – 8° 0.65 (0.0256) BSC 0.55 – 0.95 (0.022 – 0.037) 0.13 – 0.22 (0.005 – 0.009) NOTE: DIMENSIONS ARE IN MILLIMETERS *DIMENSIONS DO NOT INCLUDE MOLD FLASH.
PAGE 8
LTC7545A U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. SW Package 20-Lead Plastic Small Outline (Wide 0.300) (LTC DWG # 05-08-1620) 0.496 – 0.512* (12.598 – 13.005) 20 19 18 17 16 15 14 13 12 11 0.394 – 0.419 (10.007 – 10.643) NOTE 1 0.291 – 0.299** (7.391 – 7.595) 0.010 – 0.029 × 45° (0.254 – 0.737) 1 2 3 4 5 6 7 8 9 10 0.037 – 0.045 (0.940 – 1.143) 0.093 – 0.104 (2.362 – 2.642) 0° – 8° TYP 0.009 – 0.013 (0.229 – 0.330) NOTE 1 0.016 – 0.050 (0.