DA C56 ® 49% FPO DA DAC56 C5 6 Monolithic 16-Bit Resolution DIGITAL-TO-ANALOG CONVERTER FEATURES APPLICATIONS ● COMPLETE D/A CONVERTER: Internal Voltage Reference ±3V Output Operational Amplifier Pinout Allows IOUT (±1.0mA) Option No external components required ● PROCESS CONTROL ● ATE PIN ELECTRONICS LEVEL SETTING ● CLOSED-LOOP SERVO-CONTROL ● AUTO-CALIBRATION CIRCUIT FOR A/D BOARDS ● 0.012% LINEARITY ERROR MAX ● UP-GRADE REPLACEMENT FOR MULTIPLYING D/A ● 12-BIT MONOTONICITY GUARANTEED OVER 0°C TO +70°C ● X-Y PLOTTER ● ±5V TO ±12V POWER SUPPLY ● DSP PROCESSOR BOARDS ● SETTLING TIME: VOUT = 1.5µs; IOUT = 350ns ● SERIAL DATA INPUT: Binary Two’s Complement ● 16-PIN PLASTIC DIP AND SOIC DESCRIPTION A high-speed interface is capable of clocking in data at a rate of 10MHz max, and its interface logic contains a serial data clock (input), serial data (input) and latch-enable (input). Serial data is clocked MSB first into a 16-bit register and then latched into a 16-bit parallel register. The DAC56 is a complete 16-bit monolithic D/A converter. Completely self-contained with a stable, low noise, internal zener voltage reference; high-speed current switches; a resistor ladder network; and a low noise output operational amplifier all on a single monolithic chip. The DAC56 operates over a wide power supply range from ±5V to ±12V. The DAC56 is packaged in a 16-pin plastic DIP and 16-pin SOIC. Differential linearity error (DLE) is guaranteed to meet specifications without external adjustment. However, provisions for an externally adjustable circuit controlling the MSB error, the differential linearity error at bipolar zero, makes the DLE at BPZ essentially zero and provides for high system performance. The I/V amplifier stage includes an output current limiting circuit to protect both amplifier and load from excessive current. This assures the user of high system reliability. RF Reference 16-Bit IOUT DAC Output 16-Bit Input Latch 16-Bit Serial-to-Parallel Conversion Clock LE Data International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111 Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ® PDS-1231A 1 DAC56 SPECIFICATIONS ELECTRICAL All specifications at +25°C, and power supply voltage of ±5V, unless otherwise noted. DAC56 PARAMETER CONDITIONS DIGITAL INPUT Resolution Digital Input Level: (1) VIH VIL IIH • VI = +2.7V IIL • VI = +0.4V Input Clock Frequency ACCURACY Integral Linearity Error Differential Linearity Error Gain Error Bipolar Zero Error Monotonicity TEMPERATURE DRIFT Gain Drift Bipolar Zero Drift Linearity Drift Differential Linearity Drift MIN TYP MAX UNITS +VL +0.8 +1 –50 Bits V V µA µA MHz ±0.012 ±0.024 ±1.5 ±0.5 12 % of FSR(3) % of FSR % of FSR % of FSR Bits ±0.012 ±0.024 ppm of FSR/°C ppm of FSR/°C % of FSR % of FSR 16 +2.4 0 10 0°C to +70°C 0°C to +70°C ±60 ±20 POWER SUPPLY SENSITIVITY Gain Bipolar Zero ±VS = ±VL = ±5VDC SETTLING TIME Voltage Output 6V Step 1LSB Current Output 1mA Step to ±0.006% of FSR 10 to 100Ω Load 1kΩ Load(3) Slew Rate ANALOG OUTPUT Voltage Output Configuration Bipolar Range Output Current Output Impedance Short Circuit Duration Current Output Configuration Bipolar Range Output Impedance ±2.66 ±8 ±0.0045 ±0.0015 % of FSR/%V % of FSR/%V 1.5 1 µs µs 350 350 ns ns 12 V/µs ±3.0 ±3.34 0.1 Indefinite to Common ±1 1.2 WARMUP TIME mA kΩ 1 POWER SUPPLY REQUIREMENTS(4) Supply Voltage +VS and +VL –VS and –VL Supply Drain (No Load) +V (+VS and +VL = +5V) –V (–VS and –VL = –5V) +V (+VS and +VL = +12V) –V (–VS and –VL = –12V) Power Dissipation VS and VL = ±5V VS and VL = ±12V +4.75 –4.75 TEMPERATURE RANGE Specification Storage 0 –60 V mA Ω min +5.00 –5.00 +13.2 –13.2 V V +10 –25 +12 –27 +17 –35 mA mA mA mA 175 468 260 mW mW 70 100 °C °C NOTES: (1) Logic input levels are TTL-/CMOS-compatible. (2) FSR means full-scale range and is equivalent to 6V (±3V) for DAC56 in the VOUT mode. (3) Measured with an active clamp to provide a low impedance for approximately 200ns. (4) All specifications assume +VS connected to +VL and –VS connected to –VL. If supplies are connected separately, –VL must not be more negative than –VS to assure proper operation. No similar restriction applies to the value of +VL with respect to +VS. ® DAC56 2 PIN CONFIGURATION –5V –VS LCOM 1µF 1 16 16-Bit DAC Latch 1µF 15 TRIM 2 +VL +5V 3 1µF NC 4 CLK 5 LE 6 Data 7 –VL –5V +5V +VS 16-Bit Serial to Parallel Conversion 16-Bit IOUT DAC 14 MSB ADJ 13 12 Control Logic and Level Shifting Circuit 11 10 IOUT ACOM SJ RF Analog Output 9 8 VOUT (±3.0V) 1µF NOTES: = Analog Common = Logic Common ABSOLUTE MAXIMUM RATINGS PIN ASSIGNMENTS PIN NAME 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 –VS LCOM +VL NC CLK LE DATA –VL VOUT RF SJ ACOM IOUT MSB ADJ TRIM +VS DC Supply Voltage ....................................................................... ±15VDC Input Logic Voltage ........................................................... –1V to +V S/+VL Power Dissipation .......................................................................... 850mW Operating Temperature ................................................... –25°C to +70°C Storage Temperature ..................................................... –80°C to +100°C Lead Temperature (soldering, 10s) ............................................... +300°C FUNCTION Analog Negative Supply Logic Common Logic Positive Supply No Connection Clock Input Latch Enable Input Serial Data Input Logic Negative Supply Voltage Output Feedback Resistor Summing Junction Analog Common Current Output MSB Adjustment Terminal MSB Trim-pot Terminal Analog Positive Supply ELECTROSTATIC DISCHARGE SENSITIVITY Electrostatic discharge can cause damage ranging from performance degradation to complete device failure. BurrBrown Corporation recommends that all integrated circuits be handled and stored using appropriate ESD protection methods. PACKAGE INFORMATION PRODUCT DAC56P DAC56U PACKAGE PACKAGE DRAWING NUMBER(1) 16-Pin Plastic DIP 16-Pin SOIC 180 211 NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® 3 DAC56 OPERATING INSTRUCTIONS POWER SUPPLY CONNECTIONS Power supply decoupling capacitors should be added as shown in the Connection Diagram (Figure 2), for optimum performance and noise rejection. These capacitors (1µF tantalum recommended) should be connected as close as possible to the converter. The accuracy of a D/A converter is described by the transfer function as shown in Figure 1. Digital input to analog output converter relationships are shown in Table I. The errors in the D/A converter are combinations of analog errors due to the linear circuitry, matching and tracking properties of the ladder and scaling networks, power supply rejection, and reference errors. In summary, these errors consist of initial errors including gain, offset, linearity, differential linearity, and power supply sensitivity. Gain drift over temperature rotates the line (Figure 1) about the bipolar zero point and offset drift shifts the line left or right over the operating temperature range. Most of the offset and gain drift is due to the drift of the internal reference zener diode with temperature or time. –5V 1µF –VS LCOM 16 1 1µF 15 TRIM 2 +VL +5V 3 1µF The converter is designed so that these drifts are in opposite directions. This way the bipolar zero voltage is virtually unaffected by variations in the reference voltage. NC 4 CLK 5 LE 6 Data 7 –VL –5V 16-Bit Serial to Parallel Conversion 16-Bit IOUT DAC Gain Drift 14 MSB ADJ 13 12 Control Logic and Level Shifting Circuit 11 10 IOUT ACOM SJ RF Analog Output 9 8 VOUT (±3.0V) 1µF (+FSR/2) –1LSB +5V +VS 16-Bit DAC Latch NOTES: All Bits On = Analog Common Analog Input = Logic Common FIGURE 2. Connection Diagram. Offset Drift Bipolar Zero MSB ERROR ADJUSTMENT (OPTIONAL) Differential linearity error at all codes of the DAC56 is guaranteed to meet specifications without an external adjustment. However, if adjustment of the differential linearity error at bipolar zero is desired, it can be trimmed essentially to zero using the circuit as shown in Figure 3. –FSR/2 0111...1111 Digital Output 1000...0000 * See Table I for digital code definitions. FIGURE 1. Input vs Output for an Ideal Bipolar D/A Converter. DIGITAL INPUT 470kΩ ANALOG OUTPUT Binary Two’s Complement (BTC) DAC Output Voltage (V), VOUT Mode Current (mA), IOUT Mode 7FFFH 8000H 0000H FFFFH + Full Scale – Full Scale Bipolar Zero Zero –1LSB +2.999908 –3.000000 0.000000 –0.000092 –0.999970 +1.000000 0.000000 +0.030500µA 200kΩ 1 –VS MSB Adjust 14 NOTE: (1) 10-15 turns. FIGURE 3. MSB Adjustment Circuit. After allowing ample warm-up time (5 to 10 minutes) to assure stable operation, select the input code FFFFH. Measure the output voltage using a 6-1/2 digit voltmeter and record the measurement. Change the digital input code to 0000H. Adjust the 100kΩ potentiometer (TCR of 100ppm per °C or less is recommended) to make the output voltage read 1LSB more than the voltage reading of the previous code (ex. 1LSB = 92µV at FSR = 6V). TABLE I. Digital Input to Analog Output Relationship. DIGITAL INPUT CODES The DAC56 accepts serial input data (MSB first) in Binary Two’s Complement form—Refer to Table I for input/output relationships. If the MSB adjustment circuit is not used, pins 14 and 15 should be left open. ® DAC56 100kΩ(1) Trim 15 4 (1) CLK LSB MSB DATA 1 (2) 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 MSB LE (3) (4) NOTES: (1) If clock is stopped between input of 16-bit data words, latch enable (LE) must remain low until after the first clock of the next 16-bit data word stream. (2) Data format is binary two's complement (BTC). Individual data bits are clocked in on the corresponding positive clock edge. (3) Latch enable (LE) must remain low at least one clock cycle after going negative. (4) Latch enable (LE) must be high for at least one clock cycle before going negative. FIGURE 4. Input Timing Diagram. INPUT TIMING CONSIDERATIONS Figures 4 and 5 refer to the input timing required to interface the inputs of DAC56 to a serial input data stream. Serial data is accepted in Binary Two’s Complement with the MSB being loaded first. Data is clocked in on positive going clock (CLK, pin 5) edges and is latched into the DAC input register on negative going latch enable (LE, pin 6) edges. The latch enable input must be high for at least one clock cycle before going low, and then must be held low for at least one clock cycle. The last 16 data bits clocked into the serial input register are those that are transferred to the DAC input register when latch enable goes low. In other words, when more than 16 clock cycles occur between a latch enable, only the data present during the last 16 clocks will be transferred to the DAC input register. Figure 4 gives the general input format required for the DAC56. Figure 5 shows the specific relationships between the various signals and their timing constraints. > 40ns DATA LSB MSB >15ns >15ns CLK > 40ns > 40ns > 100ns > 5ns > 15ns LE > One Clock Cycle > One Clock Cycle FIGURE 5. Input Timing Relationships. ® 5 DAC56