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TC7109A

更新时间： 2024-11-19 22:42:27
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21页 274K
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12-BIT UP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS

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TC7109A 数据手册

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3
TC7109  
TC7109A  
12-BIT µP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS  
FEATURES  
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  
■ Zero-Integrator Cycle for Fast Recovery From  
Input Overloads  
■ Eliminates Cross -Talk in Multiplexed Systems  
■ 12-Bit Plus Sign Integrating A/D Converter With  
Overrange Indication  
■ Sign Magnitude Coding Format  
■ True Differential Signal Input and Differential  
Reference Input  
■ Low Noise............................................ 15 µVP-P Typ  
■ Input Current .............................................. 1 pA Typ  
■ No Zero Adjustment Needed  
1pA drift of less than 1µV/°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.  
■ TTL-Compatible, Byte-Organized Tri-State  
Outputs  
■ UART Handshake Mode for Simple Serial Data  
Transmission  
ORDERING INFORMATION  
PART CODE  
TC7109X  
A or blank*  
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.  
Package  
Code  
Temperature  
Range  
Package  
CKW  
CLW  
CPL  
IJL  
44-Pin PQFP  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
–25°C to +85°C  
44-Pin PLCC  
40-Pin Plastic DIP  
40-Pin CerDIP  
* The "A" version has a higher IOUT on the digital lines.  
FUNCTIONAL BLOCK DIAGRAM  
HIGH-ORDER  
BYTE OUTPUTS  
LOW-ORDER  
BYTE OUTPUTS  
C
REF  
R
–
C
C
INT  
REF  
IN  
REF  
IN  
INT  
AZ  
REF  
CAP  
REF  
CAP  
38  
+
–
+
BUFF AZ  
INT  
37  
36  
39  
30  
31  
32  
17  
3
4
5
6
7
8
9
10 11 12 13 14 15 16  
18  
19  
20  
AZ  
ZI  
AZ  
ZI  
BUFFER  
–
LBEN  
INTEGRATOR  
HBEN  
16 THREE-STATE OUTPUTS  
14 LATCHES  
INT  
–
+
35  
COMPARATOR  
INPUT  
HI  
CE/LOAD  
+
DE DE  
(–) (+)  
COMP  
OUT  
AZ  
ZI  
AZ  
12-BIT COUNTER  
LATCH  
DE DE  
(+) (–)  
33  
34  
CLOCK  
COMMON  
AZ  
TC7109A  
DE (±)  
COMP OUT  
ZI  
INT  
TO  
ANALOG  
SECTION  
AZ  
INT  
DE (±)  
ZI  
CONVERSION  
CONTROL  
LOGIC  
OSCILLATOR  
AND CLOCK  
CIRCUITRY  
INPUT  
LO  
HANDSHAKE  
LOGIC  
10 µA  
–
+
6.2V  
29  
28  
–
40  
2
26  
22  
24  
21  
27  
1
23  
25  
+
REF  
OUT  
RUN/ OSC  
HOLD  
OSC BUF  
MODE  
OSC  
GND  
STATUS  
SEND  
V
V
IN OUT SEL OSC  
OUT  
TC7109/A-7 11/6/96  
TELCOM SEMICONDUCTOR, INC.  
3-91  
1234567...21

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