TC835 Datasheet, PDF (1/12 Pages) TelCom Semiconductor, Inc – PERSONAL COMPUTER DATA ACQUISITION A/D CONVERTER

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TC835
PERSONAL COMPUTER DATA ACQUISITION A/D CONVERTER
FEATURES
GENERAL DESCRIPTION
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s Upgrade of Pin-Compatible TC7135, ICL7135,
MAX7135 and SI7135
s Guaranteed 200 kHz Operation
s Single 5V Operation With TC7660
s Multiplexed BCD Data Output
s UART and Microprocessor Interface
s Control Outputs for Auto-Ranging
s Input Sensitivity ............................................ 100 µV
s No Sample and Hold Required
The TC835 is a low-power, 4-1/2 digit (0.005% resolu-
tion), BCD analog-to-digital converter (ADC) that has been
characterized for 200 kHz clock rate operation. The five
conversions per second rate is nearly twice as fast as the
ICL7135 or TC7135. The TC835 (like the TC7135) does
3 ^{not use the external diode-resistor roll-over error compen-}
sation circuits required by the ICL7135.
The multiplexed BCD data output is perfect for interfac-
ing to personal computers. The low-cost, greater than 14-
APPLICATIONS
s Personal Computer Data Acquisition
s Scales, Panel Meters, Process Controls
s HP-IL Bus Instrumentation
ORDERING INFORMATION
bit high-resolution, and 100 µV sensitivity makes the TC835
exceptionally cost-effective.
Microprocessor-based data acquisition systems are
supported by the BUSY and STROBE outputs, along with
4 ^{the RUN/HOLD input of the TC835. The overrange, under-}
range, busy, and run/hold control functions and multiplexed
BCD data outputs make the TC835 the ideal converter for
µP-based scales and measurement systems and intelligent
Part No.
Package
Temperature
Range
TC835CBU
64-Pin PQFP
0°C to +70°C
TC835CKW
44-Pin PQFP
0°C to +70°C
TC835CPI
28-Pin Plastic DIP
0°C to +70°C
NOTE: Tape and reel available for 44-pin PQFP packages.
panel meters.*
The TC835 interfaces with full-function LCD and LED
display decoder/drivers. The UNDERRANGE and
OVERRANGE outputs may be used to implement an auto-
ranging scheme or special display functions.
*See Application Notes 16 and 17 for microprocessor interface tech-
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niques.
TYPICAL APPLICATION
ADDRESS BUS
CONTROL
DATA BUS
+ 5V
PA0
PA1
PA2
6522
-VIA-
PA3
PA4
PA5
PA6
PA7
CA1
CA2
1Y
1B
2Y
2B
3Y
3B
SEL
157 ^1A
2A
3A
PB0 PB1 PB2
PB5
PB4
PB3
GAIN SELECTION ^fIN
V+ REF CAP
BUF
POL
AZ
OR
INT
UR
D5
B8 ^TC835
B4
+ INPUT
B2
B1
D1
VR
D2
D3
– INPUT
D4 ANALOG
STB COMMON
R/H
fIN
DGND
– 5V
GAIN: 10, 20, 50, 100
+15V –15V
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3
10
LH0084 ₉
14
REF
VOLTAGE
16
15
DG529
CHANNEL 1
DA
DB
WR
A1 A0 _EN
CHANNEL 2
CHANNEL 3
CHANNEL 4
DIFFERENTIAL
MULTIPLEXER
6
7
CHANNEL SELECTION
TELCOM SEMICONDUCTOR, INC.
TC835-8 11/5/96
3-65
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