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TC7109M

12-BIT µP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS

TelCom Semiconductor Inc => Microchip 

TC7109

TC7109A

12-BIT µP-COMPATIBLE

ANALOG-TO-DIGITAL CONVERTERS

TC7109/A PIN DESCRIPTION (Cont.)

40-Pin PDIP

Pin Number

27

Symbol

SEND

28

V–

29

REF OUT

30

BUFFER

31

AUTO-ZERO

32

INTEGRATOR

33

COMMON

34

INPUT LOW

35

INPUT HIGH

36

REF IN +

37

REF CAP +

38

REF CAP –

39

REF IN –

40

V+

NOTE: All digital levels are positive true.

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 CAZ.

Integrator Output — Outside foil of CINT.

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).

15

CD4040B

Q11

RESET CLK

11

10

V + 40 +5V

+5V 1 V

TRC 40

GND 1 GND

REF IN – 39

–

2 OSC CONTROL OSC IN 17

GND 3 GND

EPE 39

+5V

25 BUFF OSC OUT REF CAP – 38

2 STATUS

REF CAP + 37

1µF

EXTERNAL

REFERENCE

+5V 4 RRD

5–12 RBR1–8

CLS1 38

CLS2 37

SBS 36

19 HBEN

REF IN + 36

IN HI 35

IN LO 34

1MΩ

0.01µF

+

+

INPUT

–

13

PE

6403

CMOS UART

PI

CRL

35 GND

34 +5V

14 FE

15 OE

*TBR1–8 26–33

8

TC7109A

6 3–8 B9–B12,

POL, OR

8 9–16 B1–B8

COM 33

INT 32

AZ 31

BUFF 30

C INT

CAZ 0.15µF

0.33µF

ANALOG

GND

GND 16 SFD

20

RR1

TRE 24

DRR 18

DR 19

17 TEST

18 LBEN

21 MODE

REF OUT

V–

29

28

RINT

–5V

20kΩ 0.2VREF

100kΩ 1VREF

RUN/HOLD 26 +5V OR OPEN

SERIAL

INPUT

25 TRO

TBRL 23

TBRE 22

MR 21 GND

20 CE/LOAD

27 SEND

OSC SEL 24 GND

OSC OUT 23

OSC IN 22

3.58MHz

CRYSTAL

SERIAL

OUTPUT

*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.

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