tc7109a Microchip Technology Inc., tc7109a Datasheet - Page 10

• Manufacturer Part Number: tc7109a
• Description: 12-bit ?-compatible Analog-to-digital Converters
• Manufacturer: Microchip Technology Inc.

TC7109/A
FIGURE 3-1:
FIGURE 3-2:
DS21456C-page 10
for Over Range Input
Section
Analog
Integrator Output
Integrator Output
for Normal Input
To
Internal Clock
Status Output
Internal Latch
COMP OUT
DE (±)
INT
AZ
ZI
Number of Counts to Zero Crossing
Conversion Timing (RUN/HOLD) Pin High
Digital Section
TEST
17
Phase I
Counts
2048
Min.
STATUS
AZ
2
Control Logic
POL
Conversion
3
Proportional to V
Integrator
Saturates
OR
4
Byte Outputs
High Order
Phase II
5
12
Counts
B
Fixed
2048
INT
26
HOLD
RUN/
6
11
B
7
10
B
14 Three-State Outputs
IN
22
OSC
IN
8
B
9
Oscillator and
Clock Circuitry
23
14 Latches
OSC
OUT
9
B
8
12-Bit Counter
10
24
OSC
SEL
Latch
B
7
Clock
11
No Zero Crossing
25
BUFF
B
OSC
OUT
6
Byte Outputs
Zero Crossing
Occurs
Low Order
12
Zero Crossing
Detected
After Zero Crossing, Analog section will
be in Auto-Zero Configuration
B
5
Phase III
Counts
4096
MODE
Max
13
21
DE
B
4
Handshake
14
B
Logic
3
15
B
2
SEND
16
27
B
1
© 2006 Microchip Technology Inc.
ZI
AZ
AZ
GND
1
Zero Integrator
Phase forces
Integrator Output
to 0V
18
19
20
LBEN
HBEN
CE/LOAD