TC7109C Просмотр технического описания (PDF) - TelCom Semiconductor Inc => Microchip
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TC7109C Datasheet PDF : 21 Pages
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12-BIT µP-COMPATIBLE
ANALOG-TO-DIGITAL CONVERTERS
1
TC7109
TC7109A
INTEGRATOR OUTPUT
FOR OVERRANGE INPUT
INTEGRATOR
SATURATES
INTEGRATOR OUTPUT
FOR NORMAL INPUT
INTERNAL CLOCK
AZ
PHASE I
INT
PHASE II
INTERNAL LATCH
STATUS OUTPUT
2048
COUNTS
MIN
FIXED
2048
COUNTS
NUMBER OF COUNTS TO ZERO CROSSING
PROPORTIONAL TO VIN
ZI
2
AZ
NO ZERO
CROSSING
ZERO CROSSING
OCCURS
ZERO CROSSING
DETECTED
DE
AZ
PHASE III
ZERO INTEGRATOR
PHASE FORCES
INTEGRATOR
OUTPUT TO 0V
3
4096
COUNTS
MAX
AFTER ZERO CROSSING, ANALOG SECTION
WILL BE IN AUTO-ZERO CONFIGURATION
4
Figure 3. Conversion Timing (RUN/HOLD Pin High)
TEST
17
HIGH-ORDER
LOW-ORDER
BYTE OUTPUTS
BYTE OUTPUTS
BBBBBBBBBBBB
POL OR 12 11 10 9 8 7 6 5 4 3 2 1
3 4 5 6 7 8 9 10 11 12 13 14 15 16
14 THREE-STATE OUTPUTS
TO
ANALOG
SECTION
COMP OUT
AZ
INT
DE (±)
ZI
14 LATCHES
12-BIT COUNTER
LATCH
CLOCK
CONVERSION
CONTROL
LOGIC
OSCILLATOR
AND CLOCK
CIRCUITRY
HANDSHAKE
LOGIC
2
STATUS
26 22 23 24 25 21
RUN/ OSC OSC OSC BUFF MODE
HOLD IN OUT SEL OSC
OUT
27
SEND
TELCOM SEMICONDUCTOR, INC.
Figure 4. Digital Section
5
18 LBEN
19 HBEN
20 CE/LOAD
6
7
1
GND
8
3-99
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