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HI-DAC80V, HI-DAC85V
August 1997
12-Bit, Low Cost, Monolithic D/A Converters
Description
The Hl-DAC80V is a monolithic direct replacement for the popular DAC80 and AD DAC80. The HI-DAC85V is a monolithic direct replacement for the popular DAC85 and AD DAC85 as well as the HI-5685V. Single chip construction along with several design innovations make the Hl-DAC80V the optimum choice for low cost, high reliability applications. Intersil' unique Dielectric Isolation (Dl) processing reduces internal parasitics resulting in fast switching times and minimum glitch. On board span resistors are provided for good tracking over temperature, and are laser trimmed to high accuracy. Internally the Hl-DAC80V/HI-DAC85V eliminates code dependent ground currents by routing current from the positive supply to the internal ground node, as determined by an auxiliary R2R ladder. This results in a cancellation of code dependent ground currents allowing virtually zero variation in current through the package common, pin 21. The Hl-DAC80V is available as a voltage output device which is guaranteed over the 0oC to 75oC temperature range. The HI-DAC85V is available as a voltage output device which is guaranteed over the -25oC to 85oC temperature range. It includes a buried zener reference featuring a low temperature coefficient as well as an on board operational amplifier. The Hl-DAC80V requires only two power supplies and will operate in the range of (11.4V to 16.5V).
Features
* DAC 80V/DAC 85V Alternative Source * Monolithic Construction * Fast Settling Time (Typ) . . . . . . . . . . . . . . . . . . . . 1.5s * Guaranteed Monotonicity * Wafer Laser Trimmed Linearity, Gain, Offset * Span Resistors On-Chip * On-Board Reference * Supply Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 12V
Applications
* High Speed A/D Converters * Precision Instrumentation * CRT Display Generation
Ordering Information
PART NUMBER HI3-DAC80V-5 HI3-DAC85V-4 TEMP. RANGE (oC) 0 to 75 -25 to 85 PACKAGE 24 Ld PDIP 24 Ld PDIP PKG. NO. E24.6 E24.6
Pinout
HI-DAC80V/HI-DAC85V (PDIP) TOP VIEW
(MSB) BIT 1 1 BIT 2 2 BIT 3 3 BIT 4 4 BIT 5 5 BIT 6 6 BIT 7 7 BIT 8 8 BIT 9 9 BIT 10 10 BIT 11 11 (LSB) BIT 12 12 24 6.3V REF OUT 23 GAIN ADJUST 22 +VS 21 COMMON 20 JUNCTION 19 20V RANGE 18 10V RANGE 17 BIPOLAR OFFSET 16 REF INPUT 15 VOUT 14 -VS 13 NC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright (c) Intersil Corporation 1999
File Number
3110.1
10-1034
HI-DAC80V, HI-DAC85V Functional Block Diagram
BIT 1 IN (MSB) BIT 12 IN (LSB) 10V SPAN R
BIPOLAR OFFSET
REF IN OUT
COMMON
+VS
6.3K
GROUND CURRENT CANCELLATION CIRCUIT
20V 5K SPAN R DIGITAL INPUT LEVEL SHIFTERS AND SWITCH DRIVERS 5K
12.6K 2K 2K 2K 2K 2K 2K 2K 2K 2K 1K
SPAN JUNCTION
+
-
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K +
-
VOUT
CONTROL AMP +
-
12.6K
8K
8K
8K
8K
8K
8K
8K
8K
8K
8K
8K
8K
8K
8K
GAIN ADJUST
-VS
10-1035
HI-DAC80V, HI-DAC85V
Absolute Maximum Ratings
Power Supply Inputs +VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V -VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-20V Reference Input (Pin 16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +VS Output Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5mA Digital Inputs (Bits 1 to 12) . . . . . . . . . . . . . . . . . . . . . . . . -1V to +VS
Thermal Information
Thermal Resistance (Typical, Note 1) JA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Maximum Power Dissipation PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550mW Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
Operating Conditions
Operating Temperature Range HI-DAC80V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to 75oC HI-DAV85V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25oC to 85oC
Die Characteristics
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bipolar-DI Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: 1. JA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER SYSTEM PERFORMANCE Resolution ACCURACY (Note 2) Linear Error Differential Linearity Error Monotonicity Gain Error Offset Error ANALOG OUTPUT Output Ranges
TA = 25oC, VS 12V to 15V (Note 4), Pin 16 to Pin 24, Unless Otherwise Specified HI-DAC80V-5, HI-DAC85V-5 TEST CONDITIONS MIN Full Temperature Full Temperature Full Temperature Full Temperature (Notes 1, 3) Full Temperature (Note 1) TYP 1/4 1/
2
MAX 12 1/2 3/4 0.3 0.15 -
UNITS Bits LSB LSB % FSR % FSR V V V V V mA -
Guaranteed 0.1 0.05 2.5 5 10 0 to 5 0 to 10 0.05 Continuous 20
Output Current Output Resistance Short Circuit Duration DRIFT (Note 2) Total Bipolar Drift (Includes Gain, Offset and Linearity Drifts) Total Error Unipolar Bipolar Gain Unipolar Offset Bipolar Offset CONVERSION SPEED Settling Time With 10K Feedback With 5K Feedback For 1 LSB Change Full Scale Transition All Bits ON to OFF or OFF to ON to 0.01% or FSR (Note 2) Full Temperature To Common
5 -
ppm/oC
Full Temperature (Note 5) Full Temperature (Note 5) With Internal Reference Without Internal Reference
-
0.08 0.06 15 7 1 5
0.15 0.1 30 3 10
% FSR % FSR ppm/oC ppm/oC ppm/oC ppm/oC
-
3 1.5 1.5
-
s s s
10-1036
HI-DAC80V, HI-DAC85V
Electrical Specifications
PARAMETER Slew Rate INTERNAL REFERENCE Output Voltage Output Impedance External Current Tempco of Drift DIGITAL INPUT (Note 2) Logic Levels Logic "1" Logic "0" +15V Supply -15V Supply POWER SUPPLY CHARACTERISTICS (Note 4) Voltage Range +VS -VS Current +IS -IS Full Temperature Full Temperature Full Temperature, VS = 15V Full Temperature, VS = 15V +11.4 -11.4 +15 -15 +12 -15 +16.5 -16.5 +15 -20 V V mA mA TTL Compatible At +1A TTL Compatible At -100A +2 0 0.001 0.001 +5.5 +0.8 0.002 0.002 V V % FSR / %VS % FSR / %VS 6.250 +6.3 1.5 5 6.350 +2.5 V mA ppm/oC TA = 25oC, VS 12V to 15V (Note 4), Pin 16 to Pin 24, Unless Otherwise Specified (Continued) HI-DAC80V-5, HI-DAC85V-5 TEST CONDITIONS MIN 10 TYP 15 MAX UNITS V/s
POWER SUPPLY SENSITIVITY (Notes 2, 4)
NOTES: 1. Adjustable to zero using external potentiometers. 2. See Definitions. 3. FSR is "Full Scale Range: and is 20V for 10V range, 10V for 5V range, etc. 4. The HI-DAC80V/HI-DAC85V will operate with supply voltages as low as 11.4V. It is recommended that output voltage range -10V to +10V not be used if the supply voltages are less than 12.5V. 5. With Gain and Offset errors adjusted to zero at 25oC.
Definitions of Specifications
Digital Inputs The Hl-DAC80V accepts digital input codes in complementary binary, complementary offset binary, and complementary two's complement binary. Settling Time That interval between application of a digital step input, and final entry of the analog output within a specified window about the settled value. Intersil Corporation usually specifies a unipolar 10V full scale step, to be measured from 50% of the input digital transition, and a window of 1/2 LSB about the final value. The device output is then rated according to the worst (longest settling) case: low to high, or high to low. In a 12-bit system 1/2 LSB = 0.012% of FSR.
COMPLEMENTARY STRAIGHT BINARY
TABLE 1. ANALOG OUTPUT COMPLEMENTARY OFFSET BINARY COMPLEMENTARY TWO'S COMPLEMENT
DIGITAL INPUT MSB...LSB 000...000 100...000 111...111 011...111
+ Full Scale Mid Scale-1 LSB Zero +1/2 Full Scale
+ Full Scale -1 LSB - Full Scale Zero
-LSB + Full Scale Zero - Full Scale
Invert MSB with external inverter to obtain CTC Coding
10-1037
HI-DAC80V, HI-DAC85V
Thermal Drift Thermal drift is based on measurements at 25oC, at high (TH) and low (TL) temperatures. Drift calculations are made for the high (TH -25oC) and low (25oC-TL) ranges, and the larger of the two values is given as a specification representing worst case drift. Gain Drift, Offset Drift, Reference Drift and Total Bipolar Drift are calculated in parts per million per oC as follows:
6 FSR C GainDrift = ------------------------------- x 10 FSR 6 Offset C OffsetDrift = ------------------------------------- x 10 FSR
values within the specified operating range. Gain and offset errors must be calibrated to zero at 25oC. Then the specified limits for Total Error apply for any input code and for any temperature within the specified operating range. Power Supply Sensitivity Power Supply Sensitivity is a measure of the change in gain and offset of the D/A converter resulting from a change in -VS , or +VS supplies. It is specified under DC conditions and expressed as full scale range percent of change divided by power supply percent change.
FullScaleRange x 100 -----------------------------------------------------------------FSR ( Nominal ) PSS = -----------------------------------------------------------------V S x 100 --------------------------------V S (Nominal)
V REF ( C ) ReferenceDrift = --------------------------------------- x 10 6 V REF V O ( C ) 6 To talBipolarDrift = ------------------------------- x 10 FSR NOTE: FSR = Full Scale Output Voltage - Zero Scale Output Voltage
Glitch A glitch on the output of a D/A converter is a transient spike resulting from unequal internal ON-OFF switching times. Worst case glitches usually occur at half-scale, i.e., the major carry code transition from 011...1 to 100...0 or vice versa. For example, if turn ON is greater than OFF for 011...1 to 100...0, an intermediate state of 000...0 exists, such that, the output momentarily glitches toward zero output. Matched switching times and fast switching will reduce glitches considerably. (Measured as one half the Product of duration and amplitude.) Decoupling and Grounding For best accuracy and high frequency performance, the grounding and decoupling scheme shown in Figure 1 should be used. Decoupling capacitors should be connected close to the HI-DAC80V/HI-DAC85V (preferably to the device pins) and should be tantalum or electrolytic bypassed with ceramic types for best high frequency noise rejection.
FSR = FSR (TH) - FSR (25oC), or FSR (25oC) - FSR (TL). VO = Steady State response to any input code. Total Bipolar Drift is the variation of output voltage with temperature, in the bipolar mode of operation. It represents the net effect of drift in Gain, Offset, Linearity and Reference Voltage. Total Bipolar Drift values are calculated, based on measurements as explained above. Gain and Offset need not be calibrated to zero at 25oC. The specified limits for TBD apply for any input code and for any power supply setting within the specified operating range. Accuracy Linearity Error (Short for "Integral Linearity Error." Also, sometimes called "Integral Nonlinearity" and "Nonlinearity".) The maximum deviation of the actual transfer characteristic from an ideal straight line. The ideal line is positioned according to end-point linearity for D/A converter products from Intersil Corporation , i.e., the line is drawn between the end-points of the actual transfer characteristic (codes 00...0 and 11...1). Differential Linearity Error The difference between one LSB and the output voltage change corresponding to any two consecutive codes. A Differential Nonlinearity of 1 LSB or less guarantees monotonicity. Monotonicity The property of a D/A converter's transfer function which guarantees that the output derivative will not change sign in response to a sequence of increasing (or decreasing) input codes. That is, the only output response to a code change is to remain constant, increase for Increasing code, or decrease for decreasing code. Total Error The net output error resulting from all internal effects (primarily non-ideal Gain, Offset, Linearity and Reference Voltage). Supply voltages may be set to any
-VS 0.01F 0.01F
+VS
1F
1F
14
21
22
18 19
24 20
16
+
-
15
FIGURE 1.
10-1038
HI-DAC80V, HI-DAC85V
Reference Supply An internal 6.3V reference is provided on board the HI-DAC80V/HI-DAC85V. The voltage (pin 24) is accurate to 0.8% and must be connected to the reference input (pin 16) for specified operation. This reference may be used externally, provided current drain is limited to 2.5mA. An external buffer amplifier is recommended if this reference is to be used to drive other system components. Otherwise, variations in the load driven by the reference will result in gain variations of the HI-DAC80V/HI-DAC85V. All gain adjustments should be made under constant load conditions. Output Voltage Ranges
24 18 5k 17 6.3K 16 12.6k + 5k 3.9 M 20 -VS 5k TO 100k
TABLE 3. GAIN AND OFFSET CALIBRATIONS UNIPOLAR CALIBRATION Step 1: Offset Turn all bits OFF (11 . . . 1) Adjust R2 for 0V out Gain Turn all bits ON (00 . . . 0) Adjust R1 for FS - 1 LSB That is: 4.9988 for 0 to +5V range 9.9976 for 0 to +10V range
Step 2:
BIPOLAR CALIBRATION
+VS R2
Step 1:
-
19
Offset Turn all bits OFF (11 . . . 1) Adjust R2 for Negative FS That is: -10V for 10V range -5V for 5V range -2.5V for 2.5V range Gain Turn all bits ON (00 . . . 0) Adjust R1 for Positive FS - 1 LSB That is: +9.9951V for 10V Range +4.9976V for 5V Range +2.4988V for 2.5V Range
Step 2:
+VS R1 2.8M -VS 10k TO 100k 23
+ CONTROL AMP
-
15 21
0.01F
This Bipolar procedure adjusts the output range end points. The maximum error at zero (half scale) will not exceed the Linearity Error. See the "Accuracy" Specifications.
FIGURE 2. HI-DAC80V/HI-DAC85V
TABLE 2. RANGE CONNECTIONS CONNECT RANGE Unipolar 0 to +5V 0 to +10V Bipolar 2.5V 5V 10V PIN 15 18 18 18 18 19 PIN 17 NC NC 20 20 20 PIN 19 20 NC 20 NC 15
10-1039
HI-DAC80V, HI-DAC85V Die Characteristics
DIE DIMENSIONS: 108 mils x 163 mils METALLIZATION: Type: Al Thickness: 16kA 2kA TIE SUBSTRATE TO: Ground PASSIVATION: Type: Nitride over Silox Nitride Thickness: 3.5kA 0.5kA Silox Thickness: 12kA 1.5kA WORST CASE CURRENT DENSITY: 0.95 x 105 A/cm2
Metallization Mask Layout
HI-DAC80V, HI-DAC85V
BIT 3 BIT 2 BIT 1 (MSB) 6.3V REF OUT GAIN ADJUST +VS
BIT 4
COMMON
SUMMING JUNCTION
BIT 5
20V SPAN
BIT 6 10V SPAN BIT 7
BIT 8
BIPOLAR OFFSET
BIT 9 REF IN BIT 10 BIT 11 BIT 12 -VS VOUT
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
10-1040

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