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TC7109ACKW Scheda tecnica(PDF) 1 Page - TelCom Semiconductor, Inc

Il numero della parte TC7109ACKW
Spiegazioni elettronici  12-BIT UP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS
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Produttore elettronici  TELCOM [TelCom Semiconductor, Inc]
Homepage  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC7109ACKW Scheda tecnica(HTML) 1 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
FEATURES
s
Zero-Integrator Cycle for Fast Recovery From
Input Overloads
s
Eliminates Cross -Talk in Multiplexed Systems
s
12-Bit Plus Sign Integrating A/D Converter With
Overrange Indication
s
Sign Magnitude Coding Format
s
True Differential Signal Input and Differential
Reference Input
s
Low Noise ............................................ 15
µVP-P Typ
s
Input Current .............................................. 1 pA Typ
s
No Zero Adjustment Needed
s
TTL-Compatible, Byte-Organized Tri-State
Outputs
s
UART Handshake Mode for Simple Serial Data
Transmission
ORDERING INFORMATION
PART CODE
TC7109X
A or blank*
Package
Temperature
Code
Package
Range
CKW
44-Pin PQFP
0
°C to +70°C
CLW
44-Pin PLCC
0
°C to +70°C
CPL
40-Pin Plastic DIP
0
°C to +70°C
IJL
40-Pin CerDIP
–25
°C to +85°C
* The "A" version has a higher IOUT on the digital lines.
TC7109
TC7109A
12-BIT
µP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS
GENERAL DESCRIPTION
The TC7109A is a 12-bit plus sign, CMOS low-power
analog-to-digital converter (ADC). Only eight passive com-
ponents and a crystal are required to form a complete
dual-slope integrating ADC.
The improved VOH source current TC7109A has fea-
tures that make it an attractive per-channel alternative to
analog multiplexing for many data acquisition applica-
tions. These features include typical input bias current of
1pA drift of less than 1
µV/°C, input noise typically 15µVP-P,
and auto-zero. True differential input and reference allow
measurement of bridge-type transducers such as load
cells, strain gauges, and temperature transducers.
The TC7109A provides a versatile digital interface. In
the direct mode, chip select and HIGH/LOW byte enables
control parallel bus interface. In the handshake mode, the
TC7109A will operate with industry-standard UARTs in
controlling serial data transmission — ideal for remote
data logging. Control and monitoring of conversion timing
is provided by the RUN/HOLD input and STATUS output.
For applications requiring more resolution, see the
TC500, 15-bit plus sign ADC data sheet.
The TC7109A has improved overrange recovery per-
formance and higher output drive capability than the origi-
nal TC7109. All new (or existing) designs should specify
the TC7109A wherever possible.
FUNCTIONAL BLOCK DIAGRAM
INPUT
HI
AZ
BUFF
CAZ
INT
BUFFER
INTEGRATOR
AZ
ZI
AZ
ZI
DE
(+)
AZ
INT
AZ
COMPARATOR
COMP
OUT
35
31
30
CREF
AZ
DE (
±)
ZI
33
34
COMMON
INPUT
LO
INT
37
36
REF
IN
DE
(–)
DE
(–)
DE
(+)
RINT
CINT
38
39
REF
CAP
REF
CAP
ZI
6.2V
10
µA
28
40
V
+
V
29
REF
OUT
17
3
4
5
6
7
8
9 10 11 12 13 14
226
22
23
24
25
21
TO
ANALOG
SECTION
COMP OUT
AZ
INT
DE (
±)
ZI
CONVERSION
CONTROL
LOGIC
OSCILLATOR
AND CLOCK
CIRCUITRY
HANDSHAKE
LOGIC
15 16
27
18
19
20
LBEN
HBEN
CE/LOAD
1
GND
14 LATCHES
12-BIT COUNTER
16 THREE-STATE OUTPUTS
SEND
MODE
BUF
OSC
OUT
OSC
SEL
OSC
OUT
OSC
IN
RUN/
HOLD
STATUS
HIGH-ORDER
BYTE OUTPUTS
LOW-ORDER
BYTE OUTPUTS
TC7109A
+
+
REF
IN –
LATCH
CLOCK
32
+
+
+
TC7109/A-7 11/6/96


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