CMOS a 8-Bit Buffered Multiplying DAC AD7524 FEATURES FUNCTIONAL BLOCK DIAGRAM Microprocessor Compatible (6800, 8085, Z80, Etc.) TTL/CMOS Compatible Inputs On-Chip Data Latches Endpoint Linearity Low Power Consumption Monotonicity Guaranteed (Full Temperature Range) Latch Free (No Protection Schottky Required) APPLICATIONS Microprocessor Controlled Gain Circuits Microprocessor Controlled Attenuator Circuits Microprocessor Controlled Function Generation Precision AGC Circuits Bus Structured Instruments GENERAL DESCRIPTION The AD7524 is a low cost, 8-bit monolithic CMOS DAC designed for direct interface to most microprocessors. ORDERING GUIDE Basically an 8-bit DAC with input latches, the AD7524s load Temperature Nonlinearity Package cycle is similar to the write cycle of a random access 1 2 Model Range (V = +15 V) Option DD memory. Using an advanced thin-film on CMOS fabrication process, the AD7524 provides accuracy to 1/8 LSB with a typi- AD7524JN 40C to +85C 1/2 LSB N-16 cal power dissipation of less than 10 milliwatts. AD7524KN 40C to +85C 1/4 LSB N-16 AD7524LN 40C to +85C 1/8 LSB N-16 A newly improved design eliminates the protection Schottky AD7524JP 40C to +85C 1/2 LSB P-20A previously required and guarantees TTL compatibility when AD7524KP 40C to +85C 1/4 LSB P-20A using a +5 V supply. Loading speed has been increased for AD7524LP 40C to +85C 1/8 LSB P-20A compatibility with most microprocessors. AD7524JR 40C to +85C 1/2 LSB R-16A Featuring operation from +5 V to +15 V, the AD7524 inter- AD7524AQ 40C to +85C 1/2 LSB Q-16 faces directly to most microprocessor buses or output ports. AD7524BQ 40C to +85C 1/4 LSB Q-16 Excellent multiplying characteristics (2- or 4-quadrant) make AD7524CQ 40C to +85C 1/8 LSB Q-16 the AD7524 an ideal choice for many microprocessor con- AD7524SQ 55C to +125C 1/2 LSB Q-16 trolled gain setting and signal control applications. AD7524TQ 55C to +125C 1/4 LSB Q-16 AD7524UQ 55C to +125C 1/8 LSB Q-16 AD7524SE 55C to +125C 1/2 LSB E-20A AD7524TE 55C to +125C 1/4 LSB E-20A AD7524UE 55C to +125C 1/8 LSB E-20A NOTES 1 To order MIL-STD-883, Class B processed parts, add/883B to part number. Contact your local sales office for military data sheet. For U.S. Standard Military Drawing (SMD) see DESC drawing 5962-87700. 2 E = Leadless Ceramic Chip Carrier: N = Plastic DIP P = Plastic Leaded Chip Carrier Q = Cerdip R = SOIC. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 617/329-4700 Fax: 617/326-8703(V = +10 V, V = V = 0 V, unless otherwise noted) REF OUT1 OUT2 AD7524SPECIFICATIONS 1 Limit, T = +258C Limit, T , T A MIN MAX Parameter V = +5 V V = +15 V V = 5 V V = +15 V Units Test Conditions/Comments DD DD DD DD STATIC PERFORMANCE Resolution 8 8 8 8 Bits Relative Accuracy J, A, S Versions 1/2 1/2 1/2 1/2 LSB max K, B, T Versions 1/2 1/4 1/2 1/4 LSB max L, C, U Versions 1/2 1/8 1/2 1/8 LSB max Monotonicity Guaranteed Guaranteed Guaranteed Guaranteed 2 Gain Error 2 1/2 1 1/4 3 1/2 1 1/2 LSB max 3 Average Gain TC 40 10 40 10 ppm/C Gain TC Measured from +25C to T or from +25C to T MIN MAX 3 DC Supply Rejection, Gain/V 0.08 0.02 0.16 0.04 % FSR/% max V = 10% DD DD 0.002 0.001 0.01 0.005 % FSR/% typ Output Leakage Current I (Pin 1) 50 50 400 200 nA max DB0DB7 = 0 V WR, CS = 0 V V = 10 V OUT1 REF I (Pin 2) 50 50 400 200 nA max DB0DB7 = V WR, CS = 0 V V = 10 V OUT2 DD REF DYNAMIC PERFORMANCE 3 Output Current Settling Time (to 1/2 LSB) 400 250 500 350 ns max OUT1 Load = 100 , C = 13 pF WR, CS = EXT 0 V DB0DB7 = 0 V to V to 0 V. DD 3 AC Feedthrough at OUT1 0.25 0.25 0.5 0.5 % FSR max V = 10 V, 100 kHz Sine Wave DB0DB7 = REF at OUT2 0.25 0.25 0.5 0.5 % FSR max 0 V WR, CS = 0 V REFERENCE INPUT 4 R (Pin 15 to GND) 5 555 k min IN 20 20 20 20 k max ANALOG OUTPUTS 3 Output Capacitance C (Pin 1) 120 120 120 120 pF max DB0DB7 = V WR, CS = 0 V OUT1 DD C (Pin 2) 30 30 30 30 pF max OUT2 C (Pin 1) 30 30 30 30 pF max DB0DB7 = 0 V WR, CS = 0 V OUT1 C (Pin 2) 120 120 120 120 pF max OUT2 DIGITAL INPUTS Input HIGH Voltage Requirement V +2.4 +13.5 +2.4 +13.5 V min IH Input LOW Voltage Requirement +0.8 +1.5 +0.5 +1.5 V max V IL Input Current I 1 1 10 10 A max V = 0 V or V IN IN DD 3 Input Capacitance DB0DB7 5 5 5 5 pF max V = 0 V IN WR, CS 20 20 20 20 pF max V = 0 V IN SWITCHING CHARACTERISTICS 5 Chip Select to Write Setup Time See Timing Diagram t t = t CS WR CS AD7524J, K, L, A, B, C 170 100 220 130 ns min AD7524S, T, U 170 100 240 150 ns min Chip Select to Write Hold Time t CH All Grades 0 0 0 0 ns min Write Pulse Width t t t , t 0 WR CS WR CH AD7524J, K, L, A, B, C 170 100 220 130 ns min AD7524S, T, U 170 100 240 150 ns min Data Setup Time t DS AD7524J, K, L, A, B, C 135 60 170 80 ns min AD7524S, T, U 135 60 170 100 ns min Data Hold Time t DH All Grades 10 10 10 10 ns min POWER SUPPLY I 1 2 2 2 mA max All Digital Inputs V or V DD IL IH 100 100 500 500 A max All Digital Inputs 0 V or V DD NOTES 1 Temperature ranges as follows: J, K, L versions: 40C to +85C A, B, C versions: 40C to +85C S, T, U versions: 55C to +125C 2 Gain error is measured using internal feedback resistor. Full-Scale Range (FSR) = V . REF 3 Guaranteed not tested. 4 DAC thin-film resistor temperature coefficient is approximately 300 ppm/C. 5 AC parameter, sample tested +25C to ensure conformance to specification. Specifications subject to change without notice. 2 REV. B