12-BIT
µ
P-COMPATIBLE
ANALOG-TO-DIGITAL CONVERTERS
TC7109
TC7109A
TC7109/A PIN DESCRIPTION
(Cont.)
40-Pin PDIP
Pin Number
27
Symbol
SEND
Description
Input — Used in handshake mode to indicate ability of an external device to
accept data.
Connect to V+ if not used.
Analog Negative Supply — Nominally –5V with respect to GND (Pin 1).
Reference Voltage Output — Nominally 2.8V down from V
+
(Pin 40).
Buffer Amplifier Output
Auto-Zero Node — Inside foil of C
AZ
.
Integrator Output — Outside foil of C
INT
.
Analog Common — System is auto-zeroed to COMMON.
Differential Input Low Side
Differential Input High Side
Differential Reference Input Positive
Reference Capacitor Positive
Reference Capacitor Negative
Differential Reference Input Negative
Positive Supply Voltage — Nominally +5V with respect to GND (Pin 1).
28
29
30
31
32
33
34
35
36
37
38
39
40
V
–
REF OUT
BUFFER
AUTO-ZERO
INTEGRATOR
COMMON
INPUT LOW
INPUT HIGH
REF IN +
REF CAP +
REF CAP –
REF IN –
V
+
NOTE:
All digital levels are positive true.
15 Q11 CD4040B
RESET
CLK
11
10
+5V
1
2
GND
+5V
3
4
V
OSC CONTROL
GND
RRD
TRC
OSC IN
EPE
CLS1
CLS2
5–12
RBR1–8
SBS
PI
CRL
40
17
39
38
37
36
35
34
GND
+5V
8
6
3–8
19
HBEN
+5V
GND
1
25
2
GND
BUFF OSC OUT
STATUS
V
+ 40
+5V
–
1µF
1MΩ
0.01µF
C INT
0.15µF
EXTERNAL
REFERENCE
+
+
INPUT
–
ANALOG
GND
39
REF IN –
38
REF CAP –
REF CAP + 37
REF IN
+ 36
35
34
33
32
31
30
CAZ
0.33µF
IN HI
IN LO
13
14
15
GND
16
20
6403
CMOS UART
PE
FE
OE
SFD
TC7109A
B9–B12,
POL, OR
B1–B8
TEST
LBEN
MODE
CE/LOAD
SEND
COM
INT
AZ
BUFF
*TBR1–8
TRE
DRR
26–33
24
18
19
23
22
21
GND
8
9–16
17
18
21
20
27
RR1
SERIAL
INPUT
25
SERIAL
OUTPUT
TRO
DR
TBRL
TBRE
MR
29
RINT 20k
Ω
0.2VREF
REF OUT
100k
Ω
1VREF
– 28 –5V
V
26
RUN/HOLD
+5V OR OPEN
24
GND
OSC SEL
23
OSC OUT
3.58MHz
22
CRYSTAL
OSC IN
*
NOTE:
For lowest power consumption, TBR1–TBR8 inputs
should have 100kΩ pull-up resistors to +5V.
Figure 1.
TC7109A UART Interface (Send Any Word to UART to Transmit Latest Result)
3-96
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
