TC7135 View Datasheet(PDF) - TelCom Semiconductor Inc => Microchip
Part Name
Description
Manufacturer
TC7135 Datasheet PDF : 13 Pages
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4-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTER
TC7135
SET VREF = 1V –5V
VREF IN
100 kΩ
1 V–
28
2
UNDERRANGE
REF IN
OVERRANGE 27
3 ANALOG
COMMON
STROBE 26
ANALOG GND
0.47
µF
4
1 µF 5 INT OUT
AZ IN
RUN/HOLD 25
24
DIGTAL GND
6
BUFF OUT
23
POLARITY
SIGNAL
INPUT
100 kΩ
100
kΩ
7
1 µF 8
9
CR– EF
CR+EF
–INPUT
22
CLOCK IN
BUSY 21
20
(LSD) D1
+5V
0.1 µF
10
11
+INPUT
V+
TC7135
D2 19
D3 18
12 D5 (MSD)
D4 17
13 B1 (LSB)
14 B2
(MSB) B8 16
B4 15
CLOCK
INPUT
120 kHz
Figure 1. Test Circuit
V+
LOGIC
INPUT
BUFFER
Figure 2. Digital Logic Input
SW I
+ IN
SW R– I
SW
+
RI
REF
IN
SWR
CREF
SWZ
ANALOG
COM
SW
+
RI
SW
–
RI
ANALOG
INPUT BUFFER
+
RINT
–
SWIZ SWZ
SWZ
CINT
CSZ
–
+
INTEGRATOR
COMPARATOR
+
–
TO
DIGITAL
SECTION
SW I
– IN
SW1
3-116
Figure 3A. Internal Analog Switches
SW I
+ IN
ANALOG
INPUT BUFFER
+
RINT
SW
–
RI
SW
+
RI
–
REF
IN
SWR
CREF
SWIZ SWZ
SWZ
ANALOG
COM
SW
+
RI
SW
–
RI
SWZ
CINT
CSZ
–
+
INTEGRATOR
COMPARATOR
+
–
TO
DIGITAL
SECTION
SW I
– IN
SW1
SWITCH OPEN
SWITCH CLOSED
Figure 3B. System Zero Phase
SW I
+ IN
ANALOG
INPUT BUFFER
+
RINT
SW
–
RI
SW
+
RI
–
REF
IN
SWR
CREF
SWIZ SWZ
SWZ
ANALOG
COM
SW
+
RI
SW
–
RI
SWZ
CINT
CSZ
–
+
INTEGRATOR
COMPARATOR
+
–
TO
DIGITAL
SECTION
SW I
– IN
SW1
SWITCH OPEN
SWITCH CLOSED
Figure 3C. Input Signal Integration Phase
SW I
+ IN
ANALOG
INPUT BUFFER
+
RINT
SW
–
RI
SW
+
RI
–
REF
IN
SWR
CREF
SWIZ SWZ
SWZ
ANALOG
COM
SW
+
RI
SW
–
RI
SWZ
CINT
CSZ
–
+
INTEGRATOR
COMPARATOR
+
–
TO
DIGITAL
SECTION
SW I
– IN
SW1
SWITCH OPEN
SWITCH CLOSED
Figure 3D. Reference Voltage Integration Phase
TELCOM SEMICONDUCTOR, INC.
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