TL507C, TL507l ANALOG-TO-DIGITAL CONVERTER SLAS041 – OCTOBER 1979 – REVISED OCTOBER 1988 D D D D D D D D D Low Cost 7-Bit Resolution Montonicity Over Entire A/D Conversion Range Ratiometric Conversion Conversion Speed . . . Approximately 1 ms Single-Supply Operation . . . Either Unregulated 8-V to 18-V (VCC2 Input) or Regulated 3.5-V to 6-V (VCC1 Input) I2L Technology Power Consumption at 5 V . . . 25 mW Typ Regulated 5.5-V Output (≤1 mA) description The TL507 is a low-cost single-slope analog-todigital converter designed to convert analog inputvoltages between 0.25 VCC1 and 0.75 VCC1 into a pulse-width-modulated output code. The device contains a 7-bit synchronous counter, a binary weighted resistor ladder network, an operational amplifier, two comparators, a buffer amplifier, an internal regulator, and necessary logic circuitry. Integrated-injection logic (I2L) technology makes it possible to offer this complex circuit at low cost in a small dual-in-line 8-pin package. P PACKAGE (TOP VIEW) ENABLE CLK GND OUTPUT 1 8 2 7 3 6 4 5 RESET VCC2 VCC1 ANALOG INPUT FUNCTION TABLE ANALOG INPUT CONDITION X VI < 200 mV Vramp > VI > 200 mV VI > Vramp ENABLE L† H H H OUTPUT H L H L † Low level on enable also inhibits the reset function. H = high level, L = low level, X = irrelevant A high level on RESET clears the counter to zero, which sets the internal ramp to 0.75 VCC. Internal pulldown resistors keep RESET and ENABLE low when not connected. In continuous operation, conversion speeds of up to 1000 conversions per second are possible. The TL507 requires external signals for CLK, RESET, and ENABLE. Versatility and simplicity of operation, coupled with low cost, makes this converter especially useful for a wide variety of applications. The TL507C is characterized for operation from 0°C to 70°C, and the TL507I is characterized for operation from – 40°C to 85°C. Copyright 1988, Texas Instruments Incorporated PRODUCTION 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. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 TL507C, TL507l ANALOG-TO-DIGITAL CONVERTER SLAS041 – OCTOBER 1979 – REVISED OCTOBER 1988 functional block diagram (positive logic) Comparator 2 200 mV 5 ANALOG INPUT 4 Output CTR R MSB R 2R CLK 2 + Comparator 1 4R 8R RESET ENABLE 8 1 16R R Regulator 32R LSB 7 64R – + 6 0.25 VCC1 3 VCC2 VCC1 GND indicates an n-p-n open-collector output. schematics of inputs and outputs EQUIVALENT OF ENABLE AND RESET INPUTS EQUIVALENT OF CLOCK INPUT EQUIVALENT OF ANALOG INPUT VCC1 75 kΩ Nom 75 kΩ Nom 100 kΩ Nom Input Input Input Constant Current ≈ 10 µA Output VCC1 10 kΩ Nom 32 kΩ Nom Output 3 kΩ Nom 2 POST OFFICE BOX 655303 24 kΩ Nom • DALLAS, TEXAS 75265 TL507C, TL507l ANALOG-TO-DIGITAL CONVERTER SLAS041 – OCTOBER 1979 – REVISED OCTOBER 1988 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, VCC1 (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V Supply voltage, VCC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V Input voltage at analog input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V Input voltage at ENABLE, CLK, and RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V On-state output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V Off-state output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V Continuous total dissipation at (or below) 25°C free-air temperature (see Note 2) . . . . . . . . . . . . . 1000 mW Operating free-air temperature range: TL507C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 70°C TL507I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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 NOTES: 1. Voltage values are with respect to network ground terminal unless otherwise noted. 2. For operation above 25°C free-air temperature, derate linearly to 520 mW at 85°C at the rate of 8.0 mW/°C. recommended operating conditions MIN NOM MAX Supply voltage, VCC1 3.5 5 6 V Supply voltage, VCC2 8 15 18 V Input voltage at ANALOG INPUT 0 5.5 V ±18 V Input voltage at ENABLE, CLK, and RESET High-level input voltage, VIH, RESET and ENABLE 2 UNIT V Low-level input voltage, VIL, RESET and ENABLE 0.8 V On-state output voltage 5.5 V Off-state output voltage 1.8 V 150 kHz UNIT Clock frequency, fclock 0 125 electrical characteristics over recommended operating free-air temperature range, VCC1 = VCC2 = 5 V (unless otherwise noted) regular section PARAMETER VCC1 ICC1 Supply voltage (output) ICC2 Supply current TEST CONDITIONS VCC2 = 10 V to 18 V, ICC1 = 0 to – 1 mA VCC1 = 5 V, VCC2 open VCC2 = 15 V, VCC1 open Supply current MIN TYP† MAX 5 5.5 6 V 5 8 mA 7 10 mA TYP† MAX inputs VT+ VTVhys IIH PARAMETER Positive-going threshold voltage‡ Negative-going threshold voltage‡ TEST CONDITIONS 4.5 CLK 0.4 Hysteresis (VT+ – VT–) High level input current High-level MIN 2 RESET, ENABLE, and CLK IIL Low-level input current II Analog input current † All typical values are at TA = 25°C. ‡ These parameters are linear functions of VCC1. VI = 2.4 V VI = 18 V VI = 0 VI = 4 V POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 130 UNIT V V 2.6 4 17 35 220 320 10 V µA ±10 µA 300 nA 3 TL507C, TL507l ANALOG-TO-DIGITAL CONVERTER SLAS041 – OCTOBER 1979 – REVISED OCTOBER 1988 output section PARAMETER TEST CONDITIONS IOH IOL High-level output current Low-level output current VOH = 18 V VOL = 5.5 V VOL Low-level output voltage IOL = 1.6 mA MIN 5 TYP† MAX UNIT 0.1 100 µA 10 15 mA 80 400 mV MAX UNIT ± 80 mV operating characteristics over recommended operating free-air temperature range, VCC1 = VCC2 = 5.12 V PARAMETER TEST CONDITIONS MIN TYP† Overall error Differential nonlinearity Zero error‡ See Figure 1 ± 20 mV Binary count = 0 ± 80 mV Scale error Binary count =127 ± 80 mV Full scale input voltage‡ Binary count = 127 Propagation delay time from RESET or ENABLE 3.74 3.82 3.9 2 V µs † All typical values are at TA = 25°C. ‡ These parameters are linear functions of VCC1. definitions zero error The absolute value of the difference between the actual analog voltage at the 01H-to-00H transition and the ideal analog voltage at that transition. overall error The magnitude of the deviation from a straight line between the endpoints of the transfer function. differential nonlinearity The maximum deviation of an analog-value change associated with a 1-bit code change (1 clock pulse) from its theoretical value of 1 LSB. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL507C, TL507l ANALOG-TO-DIGITAL CONVERTER SLAS041 – OCTOBER 1979 – REVISED OCTOBER 1988 PARAMETER MEASUREMENT INFORMATION SN74191 CLK OUTPUTS DOWN/UP 4 Test Point Analog Devices AD562 (or equivalent) SN74191 RIPPLE CLOCK 5 kΩ Bits 9 –12 CLK TL507 4 Bits 5 – 8 DAC OUT Bits 1– 4 OUTPUTS DOWN/UP TL081 – ANALOG INPUT + Single Clock Pulse 5V SN74191 OUTPUT CLK ENABLE RESET RIPPLE CLOCK 100-kHz CLK INPUT CLK OUTPUTS DOWN/UP 4 Figure 1. Monotonicity and Nonlinearity Test Circuit POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 TL507C, TL507l ANALOG-TO-DIGITAL CONVERTER SLAS041 – OCTOBER 1979 – REVISED OCTOBER 1988 PRINCIPLES OF OPERATION The TL507 is a single-slope analog-to-digital converter. All single-slope converters are basically voltage-to-time or current-to-time converters. A study of the functional block diagram shows the versatility of the TL507. An external clock signal is applied through a buffer to a negative-edge-triggered synchronous counter. Binary-weighted resistors from the counter are connected to an operational amplifier used as an adder. The operational amplifier generates a signal that ramps from 0.75 • VCC1 down to 0.25 • VCC1. Comparator 1 compares the ramp signal to the analog input signal. Comparator 2 functions as a fault defector. With the analog input voltage in the range 0.25 • VCC1 to 0.75 • VCC1, the duty cycle of the output signal is determined by the unknown analog input, as shown in Figure 2 and the Function Table. For illustration, assume VCC1 = 5.12 V, 0.25 • VCC1 = 1.28 V 1 binary count V CC1 + 20 mV + (0.75 * 0.25) 128 0.75 • VCC1 – 1 count = 3.82 V The output is an open-collector n-p-n transistor capable of withstanding up to 18 V in the off state. The output is current limited to the 8- to 12-mA range; however, care must be taken to ensure that the output does not exceed 5.5 V in the on state. The voltage regulator section allows operation f rom either an unregulated 8- to 18-V VCC2 source or a regulated 3.5- to 6-V VCC1 source. Regardless of which external power source is used, the internal circuitry operates at VCC1. When operating from a VCC1 source, VCC2 may be connected to VCC1 or left open. When operating from a VCC2 source, VCC1 can be used as a reference voltage output. 3.82 V Analog Input Level 1 Ramp Input to Comparator 1 Analog Input Level 2 1.28 V Output for Input Level 1 Output for Input Level 2 Figure 2 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PACKAGE OPTION ADDENDUM www.ti.com 24-Jun-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing TL507CP OBSOLETE PDIP P Pins Package Eco Plan (2) Qty 8 TBD Lead/Ball Finish Call TI MSL Peak Temp (3) Call TI (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. 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