Detalles de un circuito integrado tl507

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 at5 V . . . 25 mW Typ Regulated 5.5-V Output (≤1 mA)

P PACKAGE (TOP VIEW)

ENABLE CLK GND OUTPUT

1 2 3 4

8 7 6 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

description
The TL507 is a low-cost single-slope analog-todigital converter designed to convert analog inputvoltages between0.25 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 smalldual-in-line 8-pin package.

† 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 TL507requires 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.

PRODUCTION DATA information is current as of publication date. Products conformto specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright © 1988, Texas Instruments Incorporated

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 ANALOG INPUT 5 4 CTR MSB CLK 2 + 8 1 R R 2R 4R 8R RESET ENABLE 16R 32R LSB 64R – + 0.25 VCC1 Regulator 7 6 3 indicates an n-p-n open-collector output. VCC2 VCC1 GND R Comparator 1

Output

schematics of inputs and outputs
EQUIVALENT OF ENABLE AND RESET INPUTS EQUIVALENT OF CLOCK INPUT EQUIVALENT OF ANALOG INPUT VCC1 75 kΩ Nom Input 75 kΩ Nom Input Input 100 kΩ Nom

ConstantCurrent ≈ 10 µA

Output VCC1 10 kΩ Nom 32 kΩ Nom

Output 3 kΩ Nom

24 kΩ Nom

2

POST OFFICE BOX 655303

• 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 . . . . . . . . . . . . . . . . . . . . . . . . ....