TI TL507CP

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.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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