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PDF TC820CLW Data sheet ( Hoja de datos )
| Número de pieza | TC820CLW | |
| Descripción | 3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE | |
| Fabricantes | TelCom Semiconductor | |
| Logotipo |  |
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1
TC820
3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY
COUNTER AND LOGIC PROBE
2
FEATURES
s Multiple Analog Measurement System
— Digit A/D Converter
— Frequency Counter
— Logic Probe
s Low Noise A/D Converter:
— Differential Inputs, (1pA Bias Current)
— On-Chip 50PPM/°C Voltage Reference
s Frequency Counter:
— 4Mhz Maximum Input Frequency
— Auto-ranging Over Four Decade Range
s Logic Probe:
— Two LCD Annunciators
— Buzzer Driver
s 3-3/4 Digit Display with Overrange Indicator
s LCD Display Driver with Built-in Contrast Control
s Data Hold Input for Comparison Measurements
s Low Battery Detect with LCD Annunciator
s Underrange and Overrange Outputs
s On-Chip Buzzer Driver with Control Input
s 44-Pin Plastic Flat Pack or PLCC or 40-Pin Plastic
DIP Packages
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The TC820 is a 3-3/4 digit, multi-measurement system
especially suited for use in portable instruments. It inte-
grates a dual slope A/D converter, auto-ranging frequency
counter and logic probe into a single 44-pin surface mount
or 40-pin through hole package. The TC820 operates from
a single 9V input voltage (battery) and features a built-in
battery low flag. Function and decimal point selection are
accomplished with simple logic inputs designed for direct
connection to an external microcontroller or rotary switch.
Ease of use, low power operation and high functional
integration make the TC820 desirable in a variety of analog
measurement applications.
ORDERING INFORMATION
3
4
Part No. Resolution
TC820CKW 3-3/4 Digits
TC820CLW 3-3/4 Digits
TC820CPL 3-3/4 Digits
Package
Temperature
Range
44-Pin Plastic
0°C to +70°C
Quad Flat Package
44-Pin Plastic
0°C to +70°C
Leadless Chip
Carrier
40-Pin Plastic DIP 0°C to +70°C
5
TRIPLEX LCD
LOGIC HIGH
LOGIC LOW
OVERRANGE PKHOLD
LOW BATT
ANNUNCIATOR DRIVE
6
EOC
UNDERRANGE
OVERRANGE
ANALOG
INPUT
FULL-SCALE
SELECT
FREQUENCY
INPUT
LOGIC
PROBE
INPUT
LOW DRIFT VOLTAGE
DIFFERENTIAL
REFERENCE
CLOCK
OSCILLATOR
TRIPLE LCD
DRIVERS
3-3/4 DIGIT
A/D CONVERTER
ANALOG GND
AUTORANGING
FREQUENCY
COUNTER
LOGIC
PROBE
DIGITAL GROUND
PEAK HOLD
COMPARATOR
TC820
TO LCD
AND BUZZER
LOW
BATTERY
DETECT
PEAK
HOLD
+
9V
TELCOM SEMICONDUCTOR, INC.
DECIMAL
POINT
DRIVERS
DECIMAL
POINT
SELECT
BUZZER
DRIVER
FUNCTION
SELECT
VOLTS
FREQUENCY
LOGIC
BUZZER
CONTROL
FUNCTION
SELECT
7
8
TC820-10 10/17/96
3-149
1 page  
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
1
TC820
PIN DESCRIPTION
Pin No.
(40-Pin
Package)
20
Pin No.
(44-Pin Flat
Package)
16
Symbol
DP0/LO
21 17 DP1/HI
22 18 BUZOUT
23 19 BUZIN
24 20 FREQ/
VOLTS
25 21 PKHOLD
22 UR
23 OR
26 24 VSS
27 25 COM
28 26 CR+ EF
29 27 CR–EF
30 28 VR+EF
31 29 VR–EF
32 30 VI–N
33 31 VI+N
34 32 VBUFF
35 33 CAZ
36 34 VINT
35 EOC/
HOLD
37 36 OSC1
38 37 OSC2
39 38 OSC3
40 39 VDD
Description
Dual-purpose input. Decimal point select input for voltage measurements. In logic
mode, connecting this pin to VDD will turn on the "low" LCD segment. There is an
internal 5µA pull-down to DGND in volts mode only. Decimal point logic:
DP1 DP0 Decimal Point Selected
00
None
01
DP1
10
DP2
11
DP3
Dual-purpose input. Decimal point select input for voltage measurements. In logic
mode, connecting this pin to VDD will turn on the "high" LCD segment. There is an
internal 5µA pull-down to DGND in volts mode only.
Buzzer output. Audio frequency, 5kHz, output which drives a piezoelectric buzzer.
Buzzer control input. Connecting BUZIN to VDD turns the buzzer on. BUZIN is
logically ORed (internally) with the "logic level low" input. There is an internal 5µA
pull-down to DGND.
Voltage or frequency measurement select input. When unconnected, or connected
to DGND, the A/D converter function is active. When connected to VDD, the
frequency counter function is active. This pin has an internal 5µA pull-down
to DGND.
Peak hold input. When connected to VDD, the converter will only update the display
if a new conversion value is greater than the preceding value. Thus, the peak
reading will be stored and held indefinitely. When unconnected, or connected to
DGND, the converter will operate normally. This pin has an internal 5µA pull-down
to DGND.
Underrange output. This output will be HIGH when the digital reading is 380 counts
or less.
Overrange output. This output will be HIGH when the analog signal input is greater
than full scale. The LCD will display "OL" when the input is overranged.
Negative supply connection. Connect to negative terminal of 9V battery.
Analog circuit ground reference point. Nominally 3.3V below VDD.
Positive connection for reference capacitor.
Negative connection for reference capacitor.
High differential reference input connection.
Low differential reference input connection.
Low analog input signal connection.
High analog input signal connection.
Buffer output. Connect to integration resistor.
Auto-zero capacitor connection.
Integrator output. Connect to integration capacitor.
Bidirectional pin. Pulses low (i.e., from VDD to DGND) at the end of each
conversion. If connected to VDD, conversions will continue, but the display is not
updated.
Crystal oscillator (input) connection.
Crystal oscillator (output) connection.
RC oscillator connection.
Positive power supply connection, typically 9V.
2
3
4
5
6
7
8
TELCOM SEMICONDUCTOR, INC.
3-153
5 Page 
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
1
Thus, the counter will operate with a 1-second time base
when a 40 kHz oscillator is used. The frequency counter
accuracy is determined by the oscillator accuracy. For
accurate frequency measurements, a crystal oscillator is
recommended.
The frequency counter will automatically select the
proper range. Auto-range operation extends over four
decades, from 3.999 kHz to 3.999 MHz. Decimal points are
set automatically in the frequency mode (Figure 5).
The logic switching levels of the RANGE/FREQ input
are CMOS levels. For best counter operation, an external
buffer is recommended. See the applications section for
details.
Logic Probe
The TC820 can also function as a simple logic probe
(Figure 6). This mode is selected when the LOGIC input is
high. Two dual-purpose pins, which normally control the
decimal points, are used as logic inputs. Connecting either
input to a logic high level will turn on the corresponding LCD
annunciator. When the "low" annunciator is on the buzzer
will be on. As with the frequency counter input, external level
shifters/buffers are recommended for the logic probe inputs.
When the logic probe function is selected while FREQ/
VOLTS is low (A/D mode), the ADC will remain in the auto-
zero mode. The LCD will read "OL" and all decimal points will
be off (Figure 7).
TC820
If the logic probe is active while FREQ/VOLTS is high
(counter mode), the frequency counter will continue to
operate. The display will read "OL" but the decimal points will
be visible. If the logic probe input is also connected to the
RANGE/FREQ input, bringing the LOGIC input low will
immediately display the frequency at the logic probe input.
2
Analog Pin Functional Description
Differential Signal Inputs (VI+N), (VI–N)
The TC820 is designed with true differential inputs, and
accepts input signals within the input stage common-mode
voltage (VCM) range. The typical range is VDD –1V to VSS
+1.5V. Common-mode voltages are removed from the sys-
tem when the TC820 operates from a battery or floating
power source (isolated from measured system) and VSS is
connected to analog common. (See Figure 8.)
3
4
5
LCD
CLOCK
OSCILLATOR
FROM INTEGRATOR
OF A/D CONVERTER
÷2
COMPARATOR
DATA LATCH, PEAK
HOLD REGISTER,
LCD DECODER/DRIVERS
FREQ/
VOLTS
RANGE/
FREQ
÷20,000
A/D CONVERTER
FREQUENCY COUNTER
A/D CONVERTER/FREQUENCY
COUNTER SELECT
ENABLE
3-3/4 DIGIT COUNTER
COUNT
OVERFLOW
TC820
TO DECIMAL
POINT DRIVERS
UNDERRANGE
DETECT
FREQUENCY
INPUT
PROGRAMMABLE
DIVIDER
( ÷1, 10, 100, 1000)
AUTO-RANGE
CONTROL
OVERRANGE
DETECT
TELCOM SEMICONDUCTOR, INC.
Figure 4. TC820 Counter Operation
6
7
8
3-159
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet TC820CLW.PDF ] | |
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