Tài liệu ADC 0804 pdf

TLH5671 ADC0801ADC0802ADC0803ADC0804ADC0805 8-Bit mP Compatible AD Converters December 1994 ADC0801ADC0802ADC0803ADC0804ADC0805 8-Bit mP Compatible AD Converters General Description The ADC0801 ADC0802 ADC0803 ADC0804 and ADC0805 are CMOS 8-bit successive approximation AD converters that use a differential potentiometric ladder similar to the 256R products These converters are de- signed to allow operation with the NSC800 and INS8080A derivative control bus with TRI-STATE  output latches di- rectly driving the data bus These ADs appear like memory locations or IO ports to the microprocessor and no inter- facing logic is needed Differential analog voltage inputs allow increasing the com- mon-mode rejection and offsetting the analog zero input voltage value In addition the voltage reference input can be adjusted to allow encoding any smaller analog voltage span to the full 8 bits of resolution Features Y Compatible with 8080 mP derivativesno interfacing logic needed - access time - 135 ns Y Easy interface to all microprocessors or operates ‘‘stand alone’’ Y Differential analog voltage inputs Y Logic inputs and outputs meet both MOS and TTL volt- age level specifications Y Works with 25V (LM336) voltage reference Y On-chip clock generator Y 0V to 5V analog input voltage range with single 5V supply Y No zero adjust required Y 03  standard width 20-pin DIP package Y 20-pin molded chip carrier or small outline package Y Operates ratiometrically or with 5 V DC  25 V DC  or ana- log span adjusted voltage reference Key Specifications Y Resolution 8 bits Y Total error g  LSB g  LSB and g 1 LSB Y Conversion time 100 ms Typical Applications TLH5671–1 8080 Interface TLH5671–31 Error Specification (Includes Full-Scale Zero Error and Non-Linearity) Part Full- V REF 2 e 2500 V DC V REF 2 e No Connection Number Scale (No Adjustments) (No Adjustments) Adjusted ADC0801 g  LSB ADC0802 g  LSB ADC0803 g  LSB ADC0804 g 1 LSB ADC0805 g 1 LSB TRI-STATE  is a registered trademark of National Semiconductor Corp Z-80  is a registered trademark of Zilog Corp C 1995 National Semiconductor Corporation RRD-B30M115Printed in U S A Absolute Maximum Ratings (Notes12) If MilitaryAerospace specified devices are required please contact the National Semiconductor Sales OfficeDistributors for availability and specifications Supply Voltage (V CC ) (Note 3) 65V Voltage Logic Control Inputs b 03V to a 18V At Other Input and Outputs b 03V to (V CC a 03V) Lead Temp (Soldering 10 seconds) Dual-In-Line Package (plastic) 260  C Dual-In-Line Package (ceramic) 300  C Surface Mount Package Vapor Phase (60 seconds) 215  C Infrared (15 seconds) 220  C Storage Temperature Range b 65  Cto a 150  C Package Dissipation at T A e 25  C 875 mW ESD Susceptibility (Note 10) 800V Operating Ratings (Notes12) Temperature Range T MIN s T A s T MAX ADC080102LJ ADC0802LJ883 b 55  C s T A s a 125  C ADC0801020304LCJ b 40  C s T A s a 85  C ADC0801020305LCN b 40  C s T A s a 85  C ADC0804LCN 0  C s T A s a 70  C ADC08020304LCV 0  C s T A s a 70  C ADC08020304LCWM 0  C s T A s a 70  C Range of V CC 45 V DC to 63 V DC Electrical Characteristics The following specifications apply for V CC e 5V DC T MIN s T A s T MAX and f CLK e 640 kHz unless otherwise specified Parameter Conditions Min Typ Max Units ADC0801 Total Adjusted Error (Note 8) With Full-Scale Adj g  LSB (See Section 252) ADC0802 Total Unadjusted Error (Note 8) V REF 2 e 2500 V DC g  LSB ADC0803 Total Adjusted Error (Note 8) With Full-Scale Adj g  LSB (See Section 252) ADC0804 Total Unadjusted Error (Note 8) V REF 2 e 2500 V DC g 1 LSB ADC0805 Total Unadjusted Error (Note 8) V REF 2-No Connection g 1 LSB V REF 2 Input Resistance (Pin 9) ADC0801020305 25 80 kX ADC0804 (Note 9) 075 11 kX Analog Input Voltage Range (Note 4) V( a )orV( b ) Gnd– 005 V CC a 005 V DC DC Common-Mode Error Over Analog Input Voltage g  g  LSB Range Power Supply Sensitivity V CC e 5V DC g 10% Over g  g  LSB Allowed V IN ( a ) and V IN ( b ) Voltage Range (Note 4) AC Electrical Characteristics The following specifications apply for V CC e 5V DC and T A e 25  C unless otherwise specified Symbol Parameter Conditions Min Typ Max Units T C Conversion Time f CLK e 640 kHz (Note 6) 103 114 ms T C Conversion Time (Note 5 6) 66 73 1f CLK f CLK Clock Frequency V CC e 5V (Note 5) 100 640 1460 kHz Clock Duty Cycle (Note 5) 40 60 % CR Conversion Rate in Free-Running INTR tied to WR with 8770 9708 convs Mode CS e 0V DC f CLK e 640 kHz t W(WR)L Width of WR Input (Start Pulse Width) CS e 0V DC (Note 7) 100 ns t ACC Access Time (Delay from Falling C L e 100 pF 135 200 ns Edge of RD to Output Data Valid) t 1H t 0H TRI-STATE Control (Delay C L e 10 pF R L e 10k 125 200 ns from Rising Edge of RD to (See TRI-STATE Test Hi-Z State) Circuits) t WI t RI Delay from Falling Edge 300 450 ns of WR or RD to Reset of INTR C IN Input Capacitance of Logic 5 75 pF Control Inputs C OUT TRI-STATE Output 5 75 pF Capacitance (Data Buffers) CONTROL INPUTS  Note CLK IN (Pin 4) is the input of a Schmitt trigger circuit and is therefore specified separately  V IN (1) Logical ‘‘1’’ Input Voltage V CC e 525 V DC 20 15 V DC (Except Pin 4 CLK IN) 2 AC Electrical Characteristics (Continued) The following specifications apply for V CC e 5V DC and T MIN s T A s T MAX  unless otherwise specified Symbol Parameter Conditions Min Typ Max Units CONTROL INPUTS  Note CLK IN (Pin 4) is the input of a Schmitt trigger circuit and is therefore specified separately  V IN (0) Logical ‘‘0’’ Input Voltage V CC e 475 V DC 08 V DC (Except Pin 4 CLK IN) I IN (1) Logical ‘‘1’’ Input Current V IN e 5V DC 0005 1 mA DC (All Inputs) I IN (0) Logical ‘‘0’’ Input Current V IN e 0V DC b 1 b 0005 mA DC (All Inputs) CLOCK IN AND CLOCK R V T a CLK IN (Pin 4) Positive Going 27 31 35 V DC Threshold Voltage V T b CLK IN (Pin 4) Negative 15 18 21 V DC Going Threshold Voltage V H CLK IN (Pin 4) Hysteresis 06 13 20 V DC (V T a ) b (V T b ) V OUT (0) Logical ‘‘0’’ CLK R Output I O e 360 mA 04 V DC Voltage V CC e 475 V DC V OUT (1) Logical ‘‘1’’ CLK R Output I O eb 360 mA 24 V DC Voltage V CC e 475 V DC DATA OUTPUTS AND INTR V OUT (0) Logical ‘‘0’’ Output Voltage Data Outputs I OUT e 16 mA V CC e 475 V DC 04 V DC INTR Output I OUT e 10 mA V CC e 475 V DC 04 V DC V OUT (1) Logical ‘‘1’’ Output Voltage I O eb 360 mA V CC e 475 V DC 24 V DC V OUT (1) Logical ‘‘1’’ Output Voltage I O eb 10 mA V CC e 475 V DC 45 V DC I OUT TRI-STATE Disabled Output V OUT e 0V DC b 3 mA DC Leakage (All Data Buffers) V OUT e 5V DC 3 mA DC I SOURCE V OUT Short to Gnd T A e 25  C 45 6 mA DC I SINK V OUT Short to V CC T A e 25  C 90 16 mA DC POWER SUPPLY I CC Supply Current (Includes f CLK e 640 kHz Ladder Current) V REF 2 e NC T A e 25  C and CS e 5V ADC0801020304LCJ05 11 18 mA ADC0804LCNLCVLCWM 19 25 mA Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating the device beyond its specified operating conditions Note 2 All voltages are measured with respect to Gnd unless otherwise specified The separate A Gnd point should always be wired to the D Gnd Note 3 A zener diode exists internally from V CC to Gnd and has a typical breakdown voltage of 7 V DC  Note 4 For V IN ( b ) t V IN ( a ) the digital output code will be 0000 0000 Two on-chip diodes are tied to each analog input (see block diagram) which will forward conduct for analog input voltages one diode drop below ground or one diode drop greater than the V CC supply Be careful during testing at low V CC levels (45V) as high level analog inputs (5V) can cause this input diode to conduct–especially at elevated temperatures and cause errors for analog inputs near full-scale The spec allows 50 mV forward bias of either diode This means that as long as the analog V IN does not exceed the supply voltage by more than 50 mV the output code will be correct To achieve an absolute 0 V DC to5V DC input voltage range will therefore require a minimum supply voltage of 4950 V DC over temperature variations initial tolerance and loading Note 5 Accuracy is guaranteed at f CLK e 640 kHz At higher clock frequencies accuracy can degrade For lower clock frequencies the duty cycle limits can be extended so long as the minimum clock high time interval or minimum clock low time interval is no less than 275 ns Note 6 With an asynchronous start pulse up to 8 clock periods may be required before the internal clock phases are proper to start the conversion process The start request is internally latched see Figure 2 and section 20 Note 7 The CS input is assumed to bracket the WR strobe input and therefore timing is dependent on the WR pulse width An arbitrarily wide pulse width will hold the converter in a reset mode and the start of conversion is initiated by the low to high transition of the WR pulse (see timing diagrams) Note 8 None of these ADs requires a zero adjust (see section 251) To obtain zero code at other analog input voltages see section 25 and Figure 5  Note 9 The V REF 2 pin is the center point of a two-resistor divider connected from V CC to ground In all versions of the ADC0801 ADC0802 ADC0803 and ADC0805 and in the ADC0804LCJ each resistor is typically 16 kX In all versions of the ADC0804 except the ADC0804LCJ each resistor is typically 22 kX Note 10 Human body model 100 pF discharged through a 15 kX resistor 3 Typical Performance Characteristics Logic Input Threshold Voltage vs Supply Voltage Delay From Falling Edge of RD to Output Data Valid vs Load Capacitance CLK IN Schmitt Trip Levels vs Supply Voltage f CLK vs Clock Capacitor Full-Scale Error vs Conversion Time Effect of Unadjusted Offset Error vs V REF 2 Voltage Output Current vs Temperature Power Supply Current vs Temperature (Note 9) Linearity Error at Low V REF 2 Voltages TLH5671–2 4 TRI-STATE Test Circuits and Waveforms t 1H t 1H C L e 10 pF t r e 20 ns t 0H t 0H C L e 10 pF t r e 20 ns TLH5671–3 Timing Diagrams (All timing is measured from the 50% voltage points) Output Enable and Reset INTR Note Read strobe must occur 8 clock periods (8f CLK ) after assertion of interrupt to guarantee reset of INTR TLH5671–4 5 Typical Applications (Continued) 6800 Interface Ratiometric with Full-Scale Adjust Note before using caps at V IN or V REF 2 see section 232 Input Bypass Capacitors Absolute with a 2500V Reference For low power see also LM385-25 Absolute with a 5V Reference Zero-Shift and Span Adjust 2V s V IN s 5V Span Adjust 0V s V IN s 3V TLH5671–5 6 Typical Applications (Continued) Directly Converting a Low-Level Signal V REF 2 e 256 mV A mP Interfaced Comparator For V IN ( a ) l V IN ( b ) Output e FF HEX For V IN ( a ) k V IN ( b ) Output e 00 HEX 1 mV Resolution with mP Controlled Range V REF 2 e 128 mV 1 LSB e 1mV V DAC s V IN s (V DAC a 256 mV) Digitizing a Current Flow TLH5671–6 7 Typical Applications (Continued) Self-Clocking Multiple ADs Use a large R value to reduce loading at CLK R output External Clocking 100 kHz s f CLK s 1460 kHz Self-Clocking in Free-Running Mode After power-up a momentary grounding of the WR input is needed to guarantee operation mP Interface for Free-Running AD Operating with ‘‘Automotive’’ Ratiometric Transducers V IN ( b ) e 015 V CC 15% of V CC s V XDR s 85% of V CC Ratiometric with V REF 2 Forced TLH5671–7 8 Typical Applications (Continued) mP Compatible Differential-Input Comparator with Pre-Set V OS (with or without Hysteresis) See Figure 5 to select R value DB7 e ‘‘1’’ for V IN ( a ) l V IN ( b ) a (V REF 2) Omit circuitry within the dotted area if hysteresis is not needed Handling g 10V Analog Inputs Beckman Instruments  694-3-R10K resistor array Low-Cost mP Interfaced Temperature-to-Digital Converter mP Interfaced Temperature-to-Digital Converter Circuit values shown are for 0  C s T A s a 128  C Can calibrate each sensor to allow easy replacement then AD can be calibrated with a pre-set input voltage TLH5671–8 9 Typical Applications (Continued) Handling g 5V Analog Inputs TLH5671–33 Beckman Instruments  694-3-R10K resistor array Read-Only Interface TLH5671–34 mP Interfaced Comparator with Hysteresis TLH5671–35 Analog Self-Test for a System TLH5671–36 Protecting the Input TLH5671–9 A Low-Cost 3-Decade Logarithmic Converter TLH5671–37 LM389 transistors A B C D e LM324A quad op amp Diodes are 1N914 10 [...]... 85 C ADC0 801LCN ADC0 802LCWM ADC0 802LCN ADC0 803LCWM ADC0 803LCV ADC0 803LCN ADC0 804LCWM PACKAGE OUTLINE ADC0 802LCV ADC0 804LCV M20B Small Outline TEMP RANGE Chip Carrier N20A b 40 C TO a 85 C Bit Adjusted Bit Unadjusted g Bit Adjusted g 1Bit Unadjusted g ERROR V20A ADC0 804LCN g PACKAGE OUTLINE Molded DIP b 55 C TO a 125 C ADC0 801LCJ ADC0 802LCJ ADC0 803LCJ ADC0 804LCJ ADC0 805LCN ADC0 801LJ ADC0 802LJ ADC0 802LJ... ADC0 803LCWM or ADC0 804LCWM NS Package Number M20B 34 Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number ADC0 801LCN ADC0 802LCN ADC0 803LCN ADC0 804LCN or ADC0 805LCN NS Package Number N20A 35 ADC0 801 ADC0 802 ADC0 803 ADC0 804 ADC0 805 8-Bit mP Compatible A D Converters Physical Dimensions inches (millimeters) (Continued) Molded Chip Carrier Package (V) Order Number ADC0 802LCV... Diagrams ADC0 80X Dual-In-Line and Small Outline (SO) Packages ADC0 80X Molded Chip Carrier (PCC) Package TL H 5671 – 32 TL H 5671–30 See Ordering Information 32 33 Physical Dimensions inches (millimeters) Dual-In-Line Package (J) Order Number ADC0 801LJ ADC0 802LJ ADC0 801LCJ ADC0 802LCJ ADC0 803LCJ or ADC0 804LCJ ADC0 802LJ 883 or 5962-9096601MRA NS Package Number J20A SO Package (M) Order Number ADC0 802LCWM ADC0 803LCWM... FIGURE 14 ADC0 801-MC6800 CPU Interface 23 TL H 5671 – 24 Functional Description (Continued) 0010 0012 0015 0018 001B 001C 001D 001F 0022 0024 0027 0028 002A 002C 002E 0031 0033 0034 0036 0038 003B 003D 003F SAMPLE PROGRAM FOR FIGURE 14 ADC0 801-MC6800 CPU INTERFACE DF 36 DATAIN STX TEMP2 Save contents of X CE 00 2C LDX $002C Upon IRQ low CPU FF FF F8 STX $FFF8 jumps to 002C B7 50 00 STAA $5000 Start ADC0 801... N20A 35 ADC0 801 ADC0 802 ADC0 803 ADC0 804 ADC0 805 8-Bit mP Compatible A D Converters Physical Dimensions inches (millimeters) (Continued) Molded Chip Carrier Package (V) Order Number ADC0 802LCV ADC0 803LCV or ADC0 804LCV NS Package Number V20A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL... Differential Transducer Amplifier and A D Converter The differential inputs of the ADC0 801 series eliminate the need to perform a differential to single ended conversion for a differential transducer Thus one op amp can be eliminated since the differential to single ended conversion is provided by the differential input of the ADC0 801 series In general a transducer preamp is required to take advantage of... used are compatible with the BLC 80 10 microcomputer system In particular Port A and the ADC0 801 are at port address E4 Port B is at port address E5 Port C is at port address E6 PPI control word port is at port address E7 Program Counter automatically goes to ADDR 3C3D upon acknowledgement of an interrupt from the ADC0 801 5 3 Multiple A D Converters in a Z-80 Interrupt Driven Mode In data acquisition... would have its counterpart using any microprocessor that is desired 5 1 Multiple ADC0 801 Series to MC6800 CPU Interface To transfer analog data from several channels to a single microprocessor system a multiple converter scheme presents several advantages over the conventional multiplexer single-converter approach With the ADC0 801 series the differential inputs allow individual span adjustment for each... be tied to a 12V through a 1 kX resistor to generate the RST 7 instruction when an interrupt is acknowledged as required by the accompanying sample program FIGURE 10 ADC0 801 – INS8080A CPU Interface 0038   SAMPLE PROGRAM FOR FIGURE 10 ADC0 801 – INS8080A CPU INTERFACE C3 00 03 RST 7 JMP LD DATA     0100 21 00 02 START LXI H 0200H 0103 0106 0107 0109 010C 010E 010F 0110 0113 31 00 04 7D FE OF CA... order for the microprocessor to service subroutines and interrupts the stack pointer must be dimensioned in the user’s program TL H 5671 – 25 FIGURE 15 ADC0 801 – MC6820 PIA Interface 24 Functional Description (Continued) SAMPLE PROGRAM FOR FIGURE 15 ADC0 801 – MC6820 PIA INTERFACE 0010 0013 0016 0019 001A 001D 0020 0021 0023 0025 0028 002B 002C 002E 0031 0033 0034 0036 0038 003A 003D 003F 0040 CE 00 . TLH5671 ADC0 801 ADC0 802 ADC0 803 ADC0 804 ADC0 805 8-Bit mP Compatible AD Converters December 1994 ADC0 801 ADC0 802 ADC0 803 ADC0 804 ADC0 805 8-Bit mP. the ADC0 801 ADC0 802 ADC0 803 and ADC0 805 and in the ADC0 804LCJ each resistor is typically 16 kX In all versions of the ADC0 804 except the ADC0 804LCJ