ADC0832

ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 � 8-Bit Resolution � Easy Microprocessor interface or Stand-Alone Operation � Operates Ratiometrically or With 5-V Reference � Single Channel or Multiplexed Twin Channels With Single-Ended or Differential Input Options � Input Range 0 to 5 V With Single 5-V Supply � Inputs and Outputs Are Compatible With TTL and MOS � Conversion Time of 32 µs at CLK = 250 kHz � Designed to Be interchangeable With National Semiconductor ADC0831 and ADC0832 DEVICE TOTAL UNADJUSTED ERROR DEVICE A-SUFFIX B-SUFFIX ADC0831 ± 1 LSB ± 1/2 LSB ADC0832 ± 1 LSB ± 1/2 LSB description These devices are 8-bit successive-approximation analog-to-digital converters. The ADC0831A and ADC0831B have single input channels; the ADC0832A and ADC0832B have multiplexed twin input channels. The serial output is configured to interface with standard shift registers or microprocessors. Detailed information on interfacing to most popular microprocessors is readily available from the factory. The ADC0832 multiplexer is software configured for single-ended or differential inputs. The differential analog voltage input allows for common-mode rejection or offset of 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. The operation of the ADC0831 and ADC0832 devices is very similar to the more complex ADC0834 and ADC0838 devices. Ratiometric conversion can be attained by setting the REF input equal to the maximum analog input signal value, which gives the highest possible conversion resolution. Typically, REF is set equal to VCC (done internally on the ADC0832). For more detail on the operation of the ADC0831 and ADC0832 devices, refer to the ADC0834/A DC0838 data sheet. The ADC0831AC, ADC0831BC, ADC0832AC, and ADC0832BC are characterized for operation from 0°C to 70°C. The ADC0831AI, ADC0831BI, ADC0832AI, and ADC0832BI are characterized for operation from –40°C to 85°C. Copyright  1996, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. 1 2 3 4 8 7 6 5 CS IN+ IN– GND VCC CLK DO REF ADC0831 . . . P PACKAGE (TOP VIEW) 1 2 3 4 8 7 6 5 CS CH0 CH1 GND VCC/REF CLK DO DI ADC0832 . . . P PACKAGE (TOP VIEW) ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 functional block diagram R Start Flip-Flop S CLK CLK Time Delay S R CS DO CS CS D CLK R EOC9-Bit Shift Register CS RCLK First LSB Bit 1 Bits 0–7 First One Shot SAR Logic and Latch REN CS Bits 0–7REF Ladderand Decoder EN Comparator EN Analog MuxCH1/IN– CH0/IN+ Single/Differential Odd/Even StartCLK D Shift Register To Internal Circuits (ADC0832 Only) DI CS CLK MSB (ADC0831 Only) 7 1 5 5 1 1 1 1 1 6 ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 3POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 sequence of operation Don’t Care 1 76201267 MSBLSB LSB-First Data EvenDif +Sign OddSGL Start Bit 17 6 5 24 3 MSB DI DO CS tsu CLK 212019181413121 2 3 4 5 6 10 11 ADC0832 Hi-Z 0 LSB tconv MSB-First Data MSB HI-Z DO MUX Settling Time CS CLK 10987654321 tsu tconv ADC0831 Hi-Z MSB-First Data ADC0832 MUX ADDRESS CONTROL LOGIC TABLE MUX ADDRESS CHANNEL NUMBER SGL/DIF ODD/EVEN 0 1 L H L H L L H H + – + – + + MUX Settling Time H = high level, L = low level, – or + = polarity of selected input pin (ADC0832 only) ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 absolute maximum ratings over recommended operating free-air temperature range (unless otherwise noted) Supply voltage, VCC (see Note 1) 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage range: Logic –0.3 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analog –0.3 V to VCC + 0.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input current ±5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Total input current for package ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range: C-suffix 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-suffix –40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NOTE 1: All voltage values, except differential voltages, are with respect to the network ground terminal. recommended operating conditions MIN NOM MAX UNIT VCC Supply voltage 4.5 5 6.3 V VIH High-level input voltage 2 V VIL Low-level input voltage 0.8 V fclock Clock frequency 10 400 kHz Clock duty cycle (see Note 2) 40 60 % twH(C S) Pulse duration, CS high 220 ns tsu Setup time, CS low or ADC0832 data valid before CLK↑ 350 ns th Hold time, ADC0832 data valid after CLK↑ 90 ns TA Operating free air temperature C-suffix 0 70 °CTA Operating free-air temperature I-suffix –40 85 °C NOTE 2: The clock duty cycle range ensures proper operation at all clock frequencies. If a clock frequency is used outside the recommended duty cycle range, the minimum pulse duration (high or low) is 1 µs. electrical characteristics over recommended range of operating free-air temperature, VCC = 5 V, fclock = 250 kHz (unless otherwise noted) digital section PARAMETER TEST CONDITIONS� C SUFFIX I SUFFIX UNITPARAMETER TEST CONDITIONS� MIN TYP‡ MAX MIN TYP‡ MAX UNIT VOH High level output voltage VCC = 4.75 V, IOH = –360 µA 2.8 2.4 VVOH High-level output voltage VCC = 4.75 V, IOH = –10 µA 4.6 4.5 V VOL Low-levl output voltage VCC = 4.75 V, IOL = 1.6 mA 0.34 0.4 V IIH High-level input current VIH = 5 V 0.005 1 0.005 1 µA IIL Low-level input current VIL = 0 –0.005 –1 –0.005 –1 µA IOH High-level output (source) current VOH = VO, TA = 25°C –6.5 –14 –6.5 –14 mA IOL Low-level output (sink) current VOL = VCC, TA = 25°C 8 16 8 16 mA IOZ High-impedance-state output VO = 5 V, TA = 25°C 0.01 3 0.01 3 µAIOZ g current (DO) VO = 0, TA = 25°C –0.01 –3 –0.01 –3 µA Ci Input capacitance 5 5 pF Co Output capacitance 5 5 pF † All parameters are measured under open-loop conditions with zero common-mode input voltage. ‡ All typical values are at VCC = 5 V, TA = 25°C. ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 5POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 electrical characteristics over recommended range of operating free-air temperature, VCC = 5 V, fclock = 250 kHz (unless otherwise noted) analog and converter section PARAMETER TEST CONDITIONS† MIN TYP‡ MAX UNIT VICR Common-mode input voltage range See Note 3 –0.05 to VCC+0.05 V On-channel VI = 5 V 1 II( tdb ) Standby input current (see Note 4) Off-channel VI = 0 –1 µAII(stdby) Standby input current (see Note 4) On-channel VI = 0 –1 µA Off-channel VI = 5 V 1 ri(REF) Input resistance to reference ladder 1.3 2.4 5.9 kΩ total device PARAMETER TEST CONDITIONS† MIN TYP‡ MAX UNIT ICC Supply current ADC0831 1 2.5 mAICC Supply current ADC0832 3 5.2 mA † All parameters are measured under open-loop conditions with zero common-mode input voltage. ‡ All typical values are at VCC = 5 V, TA = 25°C. NOTES: 3. If channel IN– is more positive than channel IN+, the digital output code will be 0000 0000. Connected to each analog input are two on-chip diodes that conduct forward current for analog input voltages one diode drop above VCC .Care must be taken during testing at low VCC levels (4.5 V) because high-level analog input voltage (5 V) can, especially at high temperatures, cause this input diode to conduct and cause errors for analog inputs that are near full-scale. As long as the analog voltage does not exceed the supply voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 V to 5 V input voltage range requires a minimum VCC of 4.95 V for all variations of temperature and load. 4. Standby input currents are currents going into or out of the on or off channels when the A/D converter is not performing conversion and the clock is in a high or low steady-state condition. operating characteristics VCC = REF = 5 V, fclock = 250 kHz, tr = tf = 20 ns, TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS§ AI, AC SUFFIX BI, BC SUFFIX UNITPARAMETER TEST CONDITIONS§ MIN TYP MAX MIN TYP MAX UNIT Supply-voltage variation error VCC = 4.75 V to 5.25 V ±1/16 ±1/4 ±1/16 ±1/4 LSB Total unadjusted error (see Note 5) Vref = 5 V,TA = MIN to MAX ±1 ±1/2 LSB Common-mode error Differential mode ±1/16 ±1/4 ±1/16 ±1/4 LSB t d Propagation delay time, ouput data after CLK↑ MSB-first data CL = 100 pF 650 1500 650 1500 nstpd ouput data after CLK↑ (see Note 6) LSB-first data CL = 100 pF 250 600 250 600 ns tdi Output disable time, CL = 10 pF, RL = 10 kΩ 125 250 125 250 nstdis , DO after CS↑ CL = 100 pF, RL = 2 kΩ 500 500 ns tconv Conversion time (multiplexer addressing time not included) 8 8 clock periods § All parameters are measured under open-loop conditions with zero common-mode input voltage. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTES:5. Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors. 6. The most significant-bit-first data is output directly from the comparator and therefore requires additional delay to allow for comparator response time. Least-significant-bit-first data applies only to ADC0832. ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 PARAMETER MEASUREMENT INFORMATION Figure 1. ADC0832 Data Input Timing 50% tsu th th tsu 50% VCC GND GND 0.4 V0.4 V 2 V2 V DI 0.4 V CS CLK VCC VCC GND Figure 2. Data Output Timing 50% tpd 50% GND VOL VOH VCC CLK DO VOLTAGE WAVEFORMS S2 closed S1 open 10% 10% 90% tr VOLTAGE WAVEFORMS S2 closed S1 openDO and SARS Output tr S1 S2 LOAD CIRCUIT (see Note A) CL From Output Under Test Test Point CSCS tdis 90% 10% 90%50% 50% VCC GND GND GND GND VCC –VCC VCC VCC RL DO and SARS Output tdis Figure 3. Output Disable Time Test Circuit and Voltage Waveforms NOTE A: CL includes probe and jig capacitance. ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 7POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 TYPICAL CHARACTERISTICS Figure 4 O ffs et E rr or – L SB Vref – Reference Voltage – V 101.00.10.01 VI+ = VI– = 0 V 0 2 4 6 8 10 12 14 16 UNADJUSTED OFFSET ERROR vs REFERENCE VOLTAGE Figure 5 Vref – Reference Voltage – V Li ne ar ity E rr or – L SB VCC = 5 V fclock = 250 kHz TA = 25°C 543210 0.25 0.5 0.75 1.0 1.25 0 1.5 LINEARITY ERROR vs REFERENCE VOLTAGE Figure 6 Li ne ar ity E rr or – L SB TA – Free-Air Tempertature – °C Vref = 5 V fclock = 250 kHz 1007550250–25 0.5 0.45 0.4 0.35 0.3 –50 0.25 LINEARITY ERROR vs FREE-AIR TEMPERATURE Figure 7 Li ne ar ity E rr or – L SB fclock – Clock Frequency – kHz 25°C 85°C Vref = 5 V VCC = 5 V 600500400300200100 3 2.5 2 1.5 1 0.5 00 LINEARITY ERROR vs CLOCK FREQUENCY –40°C ADC0831A, ADC0832A, ADC0831B, ADC0832B A/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 Figure 8 TA – Free-Air Temperature — °C fclock = 250 kHz CS = High VCC = 5.5 V VCC = 5 V VCC = 4.5 V 1007550250–25 1.5 1 –50 0.5 – Su pp ly C ur re nt – m A ADC0831 SUPPLY CURRENT vs FREE-AIR TEMPERATURE CCI Figure 9 fclock – Clock Frequency – kHz VCC = 5 V TA = 25°C 1.5 1 0.5 5004003002001000 0 ADC0831 SUPPLY CURRENT vs CLOCK FREQUENCY – Su pp ly C ur re nt – m A CCI Figure 10 TA – Free-Air Temperature – °C VCC = 5 V IOL (VOL = 5 V) – IOH (VOH = 0 V) – IOH (VOH = 2.4 V) IOL (VOL = 0.4 V) 20 25 15 10 5 1007550250–25–50 0 – O ut pu t C ur re nt – m A OUTPUT CURRENT vs FREE-AIR TEMPERATURE I O IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof. Copyright  1998, Texas Instruments Incorporated