TC7109ACLW Microchip Technology, TC7109ACLW Datasheet - Page 13

IC ADC 12BIT HANDSHAKE 44PLCC

TC7109ACLW

Manufacturer Part Number
TC7109ACLW
Description
IC ADC 12BIT HANDSHAKE 44PLCC
Manufacturer
Microchip Technology
Datasheet

Specifications of TC7109ACLW

Number Of Bits
12
Data Interface
Serial, Parallel
Number Of Converters
1
Voltage Supply Source
Dual ±
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FIGURE 3-5:
With OSCILLATOR SELECT input LOW, two on-chip
capacitors and a feedback device are added to the
oscillator. In this configuration, the oscillator will oper-
ate with most crystals in the 1MHz to 5MHz range, with
no external components (Figure ). The OSCILLATOR
SELECT input LOW inserts a fixed 458 divider circuit
between the BUFFERED OSCILLATOR OUTPUT and
the internal clock. A 3.58MHz TV crystal gives a
division ratio, providing an integration time given by:
EQUATION 3-1:
FIGURE 3-7:
© 2006 Microchip Technology Inc.
Integrator Output
High Byte Data
Low Byte Data
t = (2048 clock periods)
Internal Clock
Internal Latch
Status Output
Internal Mode
V+ or Open
Mode Input
Send Input
CE/LOAD
24
OSC
SEL
HBEN
LBEN
22
OSC
IN
UART
Norm
F
OSC
TC7109A RC Oscillator
TC7109A Handshake with Send Input Held Positive
= Don't Care
= 0.45/RC
Zero Crossing Occurs
23
OSC
OUT
3.58 MHz
R
Mode High Activates
CE/LOAD, HBEN, LBEN
58
C
Zero Crossing Detected
= 33.18 msec
25
Buffered
OSC OUT
Send Sensed
= Three-State
Data Valid
High-Impendance
FIGURE 3-6:
The error is less than 1% from two 60Hz periods, or
33.33msec, which will give better than 40dB, 60Hz
rejection. The converter will operate reliably at conver-
sion rates up to 30 per second, corresponding to a
clock frequency of 245.8kHz.
When the oscillator is to be over driven, the OSCILLA-
TOR OUTPUT should be left open, and the over driving
signal should be applied at the OSCILLATOR INPUT.
The internal clock will be of the same duty cycle, fre-
quency and phase as the input signal. When the
OSCILLATOR SELECT is at GND, the clock will be
1/58 of the input frequency.
Send Sensed
GND
Data Invalid
V+
24
OSC
SEL
= Three-State
will Pull-up
22
OSC
IN
Crystal
Crystal Oscillator
Terminates
UART Mode
23
OSC
OUT
TC7109/A
DS21456C-page 13
Mode Low, not
in Handshake Mode
Disables Outputs
CE/LOAD,
HBEN,
LBEN
25
Buffered
OSC OUT
Clock
÷
58

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