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LTC7545A Improved Industry Standard Parallel 12-Bit Multiplying DAC
FEATURES
s s s s s s s
DESCRIPTIO
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
The LTC (R) 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. 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATI
s s s s
S
Process Control and Industrial Automation Software Controlled Gain Adjustment Digitally Controlled Filter and Power Supplies Automatic Test Equipment
TYPICAL APPLICATI
2-Quadrant Multiplying DAC Has Less Than 0.5LSB (Typ) Total Unadjusted Error
VIN 5V 0.1F
Integral Nonlinearity Over Temperature
1.0
INTEGRAL NONLINEARITY (LSB)
CS
16
AGND 2 DGND 4-15 3
+
WR
17
LTC7545A
-
18 19 20 RFB VDD VREF 1 OUT1
33pF
0.5 TA = 85C 0 TA = -40C -0.5 TA = 25C
LT (R)1097
VOUT
7545A TA01
-1.0
0
512 1024 1536 2048 2560 3072 3584 4095 DIGITAL INPUT CODE
7545A TA02
U
UO
UO
1
LTC7545A ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT1 1 AGND 2 DGND 3 DB11 (MSB) 4 DB10 5 DB9 6 DB8 7 DB7 8 DB6 9 DB5 10 N PACKAGE 20-LEAD PDIP 20 RFB 19 VREF 18 VDD 17 WR 16 CS 15 DB0 (LSB) 14 DB1 13 DB2 12 DB3 11 DB4 SW PACKAGE 20-LEAD PLASTIC SO WIDE
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 ............................................. . 25V Digital Inputs to DGND ................. - 0.5V to VDD + 0.5V VOUT1 to AGND, DGND ................. - 0.5V to VDD + 0.5V Maximum Junction Temperature .......................... 150C Operating Temperature Range Commercial (K, L Versions) .................... 0C to 70C Industrial (B, C Versions)................... -40 C to 85C Storage Temperature Range ................ -65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER LTC7545ABN LTC7545ABSW LTC7545ACN LTC7545ACSW LTC7545AKN LTC7545AKSW LTC7545ALN LTC7545ALSW
TJMAX = 150C, JA = 100C/W (N) TJMAX = 150C, JA = 130C/W (SW)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VDD = 5V or 15V, VREF = 10V, VOUT1 = AGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL Accuracy Resolution INL DNL GE Integral Nonlinearity (Relative Accuracy) Differential Nonlinearity Gain Error Gain Temperature Coefficient ILKG PSRR RREF OUT1 Leakage Current Power Supply Rejection VREF Input Resistance Output Current Settling Time Propagation Delay Digital-to-Analog Glitch Impulse Multiplying Feedthrough Error Analog Outputs COUT Output Capacitance (Note 3) DB0 to DB11 = 0V, WR, CS = 0V DB0 to DB11 = VDD, WR, CS = 0V COUT1 COUT1
q q q
PARAMETER
CONDITIONS
LTC7545AK/AB MIN TYP MAX 12 0.5 0.5 1 1 2 3 1 5 10 50 0.002 8 11 15 1 150 5 5 30 60 70 150
LTC7545AL/AC MIN TYP MAX 12 0.5 0.5 0.5 0.5 1 2 1 5 10 50 0.002 8 11 15 1 150 5 5 30 60 70 150
UNITS Bits LSB LSB LSB LSB LSB LSB ppm/C nA nA %/% k s ns nV-sec mVP-P pF pF
(Note 1)
TA = 25C TMIN to TMAX
q q q q q q
Guaranteed Monotonic TA = 25C TMIN to TMAX TMIN to TMAX (Note 2) TA = 25C TMIN to TMAX TA = 25C TMIN to TMAX
(Note 3) Gain/Temperature (Note 4)
Reference Input (Note 5) (Notes 3, 6, 7) (Notes 3, 6, 8) (Notes 6, 9) VREF = 10V, 10kHz Sine Wave
q
AC Performance
q q q q
2
U
W
U
U
WW
W
LTC7545A
ELECTRICAL CHARACTERISTICS
VDD = 5V, VREF = 10V, VOUT1 = AGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL Digital Inputs VIH VIL IIN CIN tCS tCH tWR tDS tDH Power Supply VDD IDD Supply Voltage Supply Current All Digital Inputs = VIH or VIL All Digital Inputs = 0V or VDD
q q q
PARAMETER Digital Input High Voltage Digital Input Low Voltage Digital Input Current Digital Input Capacitance CS to WR Setup Time CS to WR Hold Time Write Pulse Width Data Setup Time Data Hold Time
CONDITIONS
q q q
MIN 2.4
ALL GRADES TYP MAX
UNITS V
0.8 0.001 1 8 100 0 100 100 5 4.75 5 10 5.25 2 100
V A pF ns ns ns ns ns V mA A
(Note 3) VIN = 0V
q
Timing Characteristics (Note 3)
q q q q q
VDD = 15V, VREF = 10V, VOUT1 = AGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL Digital Inputs VIH VIL IIN CIN tCS tCH tWR tDS tDH Power Supply VDD IDD Supply Voltage Supply Current All Digital Inputs = VIH or VIL All Digital Inputs = 0V or VDD
q q q
PARAMETER Digital Input High Voltage Digital Input Low Voltage Digital Input Current Digital Input Capacitance CS to WR Setup Time CS to WR Hold Time Write Pulse Width Data Setup Time Data Hold Time
CONDITIONS
q q q
MIN 13.5
ALL GRADES TYP MAX
UNITS V
1.5 1 8 75 0 75 60 5 14.25 15 10 15.75 2 100
V A pF ns ns ns ns ns V mA A
(Note 3) VIN = 0V
q
Timing Characteristics (Note 3)
q q q q q
The q 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: IOUT1 with DAC register loaded to all 0s.
Note 5: Typical temperature coefficient is 100ppm/C. Note 6: OUT1 load = 100 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: VREF = 0V. DAC register contents changed from all 0s to all 1s or all 1s to all 0s.
3
LTC7545A
BLOCK DIAGRAM
VDD 18
WR 17 CS 16
TI I G DIAGRA
4
W
W
20k VREF 19 40k 40k 40k 40k 40k 40k 40k 10k 20k 20k 20 RFB 1 OUT1 2 AGND DECODER 3 DGND LOAD INPUT DATA LATCHES 4 DB11 (MSB) 5 DB10 6 DB9 7 DB8 * * * * * * * 15 DB0 (LSB)
7545A BD
UW
tCS CS
tCH
tWR WR
tDS DATA IN DB0 to DB11 DATA VALID
tDH
7545A TD
LTC7545A
TYPICAL APPLICATIONS N
Unipolar Operation (2-Quadrant Multiplication)
VREF -10V TO 10V 5V OR 15V
0.1F 19 18 20 VDD VREF RFB 17 16 P 4-15 WR CS LTC7545A OUT1 AGND DGND 3 1 2 33pF
Table 1. Unipolar Binary Code Table DIGITAL INPUT BINARY NUMBER ANALOG OUTPUT IN DAC LATCH 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
+
DB11 to DB0
-
U
LT1097
VOUT 0V TO - VREF
7545A TA03
5
LTC7545A
TYPICAL APPLICATIONS N
Bipolar Operation (4-Quadrant Multiplication)
5V OR 15V
0.1F 19 18 20 VDD VREF RFB 17 16 P 4-15 WR CS LTC7545A OUT1 AGND DGND 3 1 2 33pF
1/2LT1112
Table 2. Bipolar Offset Binary Code Table DIGITAL INPUT BINARY NUMBER IN DAC LATCH MSB 1111 1000 1000 0111 0000 1111 0000 0000 1111 0000 LSB 1111 0001 0000 1111 0000 ANALOG OUTPUT VOUT VREF (2047/2048) VREF (1/2048) 0V -VREF (1/2048) -VREF (2048/2048) = -V
REF
6
+
+
DB11-DB0
-
-
U
VREF -10V TO 10V
R2 20K
R3 20K
R1 10K
1/2LT1112
VOUT
7545A TA04
LTC7545A
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N Package 20-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
0.015 (0.381) MIN
0.005 (0.127) MIN 0.100 0.010 (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
(
+0.025 0.325 -0.015 +0.635 8.255 -0.381
)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
1.040* (26.416) MAX 20 19 18 17 16 15 14 13 12 11
0.255 0.015* (6.477 0.381)
1 0.130 0.005 (3.302 0.127)
2
3
4
5
6
7
8
9
10
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N20 0695
7
LTC7545A
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
0.291 - 0.299** (7.391 - 7.595) 0.010 - 0.029 x 45 (0.254 - 0.737)
0.009 - 0.013 (0.229 - 0.330)
NOTE 1 0.016 - 0.050 (0.406 - 1.270)
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
RELATED PARTS
PART NUMBER LTC1257 LTC1450/LTC1450L LTC1451/LTC1452/LTC1453 LTC7541A LTC7543/LTC8143 LTC8043 DESCRIPTON Complete Serial I/O VOUT 12-Bit DAC Complete Parallel Input VOUT 12-Bit DACs Complete Serial I/O VOUT 12-Bit DACs Parallel I/O Multiplying IOUT 12-Bit DAC Serial I/O Multiplying IOUT 12-Bit DACs Serial I/O Multiplying IOUT 12-Bit DAC COMMENTS 5V to 15V Single Supply in 8-Pin SO and PDIP Rail-to-Rail VOUT, 3V/5V Single Supply, 12-Bit or (8 + 4) Bit Loading Rail-to-Rail VOUT, 3V/5V Single Supply in 8-Pin SO and PDIP 12-Bit Wide Parallel Input Clear Pin and Serial Data Output (LTC8143) 8-Pin SO and PDIP
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
U
NOTE 1
0.394 - 0.419 (10.007 - 10.643)
1 0.093 - 0.104 (2.362 - 2.642)
2
3
4
5
6
7
8
9
10 0.037 - 0.045 (0.940 - 1.143)
0 - 8 TYP
0.050 (1.270) TYP 0.014 - 0.019 (0.356 - 0.482) TYP
0.004 - 0.012 (0.102 - 0.305)
S20 (WIDE) 0695
LT/GP 0596 10K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1996

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