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PDF TC826 Data sheet ( Hoja de datos )
| Número de pieza | TC826 | |
| Descripción | A/D CONVERTER WITH BAR GRAPH DISPLAY OUTPUT | |
| Fabricantes | TelCom Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC826 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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1
TC826
A/D CONVERTER WITH BAR GRAPH DISPLAY OUTPUT
2
FEATURES
GENERAL DESCRIPTION
s Bipolar A/D Conversion
s 2.5% Resolution
s Direct LCD Display Drive
s ‘Thermometer’ Bar or Dot Display
s 40 Data Segments Plus Zero
s Overrange Plus Polarity Indication
s Precision On–Chip Reference ................ 35ppm/°C
s Differential Analog Input
s Low Input Leakage .......................................... 10pA
s Display Flashes on Overrange
s Display Hold Mode
s Auto–Zero Cycle Eliminates Zero Adjust
Potentiometer
s 9V Battery Operation
s Low Power Consumption ............................ 1.1mW
s 20mV to 2.0 V Full–Scale Operation
s Non–Multiplexed LCD Drive for Maximum
Viewing Angle
PIN CONFIGURATION
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
NC
ANALOG
COMMON
+IN
1
2
3
– IN 4
REF IN
CR+EF
CR–EF
5
6
7
VDD 8
VBUF 9
CAZ 10
VINT 11
VSS 12
OSC1 13
OSC2 14
BP 15
BAR 0 16
TC826CBU
48 NC
47 BAR 30
46 BAR 29
45 BAR 28
44 BAR 27
43 BAR 26
42 BAR 25
41 BAR 24
40 BAR 23
39 BAR 22
38 BAR 21
37 BAR 20
36 BAR 19
35 BAR 18
34 BAR 17
33 BAR 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
In many applications a graphical display is preferred
over a digital display. Knowing a process or system oper-
ates, for example, within design limits is more valuable than
a direct system variable readout. A bar or moving dot display
supplies information precisely without requiring further inter-
pretation by the viewer.
The TC826 is a complete analog–to–digital converter
with direct liquid crystal (LCD) display drive. The 40 LCD
data segments plus zero driver give a 2.5% resolution bar
display. Full–scale differential input voltage range extends
from 20mV to 2V. The TC826 sensitivity is 500µv. A low drift
35 ppm/°C internal reference, LCD backplane oscillator and
driver, input polarity LCD driver, and overrange LCD driver
make designs simple and low cost. The CMOS design
required only 125µA from a 9V battery. In +5V systems a
TC7660 DC to DC converter can supply the –5V supply. The
differential analog input leakage is a low 10pA.
Two display formats are possible. The BAR mode
display is like a ‘thermometer’ scale. The LCD segment
driver that equals the input plus all below it are on. The DOT
mode activates only the segment equal to the input. In either
mode the polarity signal is active for negative input signals.
An overrange input signal causes the display to flash and
activates the overrange annunciator. A hold mode can be
selected that freezes the display and prevents updating.
The dual slope integrating conversion method with
auto–zero phase maximizes noise immunity and eliminates
zero–scale adjustment potentiometers. Zero–scale drift is a
low 5 µV/°C. Conversion rate is typically 5 per second and
is adjustable by a single external resistor.
A compact, 0.5" square, flat package minimizes PC
board area. The high pin count LSI package makes multi-
plexed LCD displays unnecessary. Low cost, direct drive
LCD displays offer the widest viewing angle and are readily
available. A standard display is available now for TC826
prototyping work.
ORDERING INFORMATION
3
4
5
6
7
Part No.
TC826CBU
Package
64–Pin PFP
Temperature
0°C to +70°C
TELCOM SEMICONDUCTOR, INC.
TC826-6 11/6/96
3-171
8
1 page  
A/D CONVERTER WITH
BAR GRAPH DISPLAY OUTPUT
1
TC826
1MΩ
1MΩ
1MΩ
CINT
61
BAR/DOT
62
HOLD
63
TEST
12
VSS
VDD
8
RINT
9
VBUF
CAZ
10
CAZ
11
VINT
CR+EF
CR–EF
OSC1
6
7
13
REF
IN
5
TC826
OSC2 14
ANALOG
COMMON –IN +IN
BP
BAR0– OR
BAR40 POL–
15
59
2 43
60
CREF
1.0µf
ROSC
430kΩ
2
3
4
9V R1 R2
–IN +IN
COMPONENT
RINT
CINT
CREF
CAZ
2V
200 mV
20 mV
FULL–SCALE FULL–SCALE FULL–SCALE
2MΩ
20kΩ
20kΩ
0.033µf
0.033 µf
0.033 µf
1µf 1µf 1µf
0.068µf
0.068µf
0.014µf
–
R1 + R2 = 250kΩ
Figure 1. Typical TC826 Circuit Connection
BACKPLANE
41 SEGMENT
LCD BAR GRAPH
5
OR
6
7
TELCOM SEMICONDUCTOR, INC.
8
3-175
5 Page 
A/D CONVERTER WITH
BAR GRAPH DISPLAY OUTPUT
1
TC826
8
9V
TC826
12 13
OSC1
14
OSC2
0.1µf
EXTERNAL
OSCILLATOR
A. SINGLE 9V SUPPLY
VDD 8
TC826
VSS 12
13
0. 1µf
OSCILLATOR
VDD = 5V
POWER
SUPPLY
B. DUAL SUPPLY
VSS = 5V
Figure 9. External Oscillator Connection
LCD Display Format
The input signal can be displayed in two formats
(Figure 10). The BAR/DOT input (Pin 61) selects the format.
The TC826 measurement cycle operates indentically for
either mode.
A. BAR MODE
1. INPUT = 0
BAR 4
BAR 3
BAR 2
BAR 1
BAR 0
OFF
OFF
OFF
OFF
ON
2. INPUT = 5%
OF FULL–SCALE
OFF
OFF
ON
ON
ON
B. DOT MODE
1. INPUT = 0
BAR 4
BAR 3
BAR 2
BAR 1
BAR 0
OFF
OFF
OFF
OFF
ON
2. INPUT = 5%
OF FULL–SCALE
OFF
OFF
ON
OFF
OFF
Figure 10. Display Option Formats
2
3
4
BAR Format
The TC826 power-ups in the BAR mode. BAR/DOT is
pulled high internally. This display format is similar to a
thermometer display. All bars/LCD segments, including
zero, below the bar/LCD segment equaling the input signal
level are on. A half-scale input signal, for example, would be
displayed with BAR 0 to BAR 20 on.
5
DOT Format
By connecting BAR/DOT to VSS through a 1MΩ resistor
the DOT mode is selected. Only the BAR LCD segment
equaling the input signal is on. The zero segment is on for
zero input.
This mode is useful for moving cursor or ‘needle’
applications.
6
7
TELCOM SEMICONDUCTOR, INC.
8
3-181
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC826.PDF ] | |
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