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TC7109 View Datasheet(PDF) - TelCom Semiconductor Inc => Microchip

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Description
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TC7109
TelCom-Semiconductor
TelCom Semiconductor Inc => Microchip TelCom-Semiconductor
TC7109 Datasheet PDF : 21 Pages
First Prev 21
12-BIT µP-COMPATIBLE
ANALOG-TO-DIGITAL CONVERTERS
1
TC7109
TC7109A
TBRL DRR
6402 CMOS UART
SERIAL OUTPUT
SERIAL INPUT
TBRE RBR1–RBR8 SFD TBR1–TBR8
2
3 GND
8-BIT DATA BUS
2
3
ANALOG
IN
MODE CE/ SEND
LOAD
B9–B12
POL, OR
6
B1-B8 8
TC7109A
ANALOG
IN
MODE CE/ SEND
LOAD
B9–B12
POL, OR
6
B1–B8 8
TC7109A
ANALOG
IN
MODE CE/ SEND
LOAD
B9–B12
POL, OR
6
B1–B8 8
TC7109A
4
RUN/HOLD
+5V
HBEN
LBEN
RUN/HOLD
+5V
HBEN
LBEN
RUN/HOLD
+5V
HBEN
LBEN
Figure 21. Handshake Interface for Multiplexed Converters
5
Integrating Converter Features
The output of integrating ADCs represents the integral,
or average, of an input voltage over a fixed period of time.
Compared with techniques in which the input is sampled and
held, the integrating converter averages the effects of noise.
A second important characteristic is that time is used to
quantize the answer, resulting in extremely small nonlinearity
errors and no missing output codes. The integrating con-
verter also has very good rejection of frequencies whose
periods are an integral multiple of the measurement period.
This feature can be used to advantage in reducing line
frequency noise (Figure 22).
30
t = MEASUREMENT
PERIOD
20
10
0
0.1/t
1/t
INPUT FREQUENCY
6
10/t
7
Figure 22. Normal Mode Rejection of Dual-Slope Converter as a
Function of Frequency
TELCOM SEMICONDUCTOR, INC.
8
3-111
 

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