TC7107ACPL Microchip Technology, TC7107ACPL Datasheet - Page 16

• Manufacturer Part Number: TC7107ACPL
• Description: IC ADC 3 1/2DGT LED DVR 40-DIP
• Manufacturer: Microchip Technology

Specifications of TC7107ACPL

• Display Type: LED
• Configuration: 7 Segment
• Digits Or Characters: A/D 3.5 Digits
• Current - Supply: 800µA
• Voltage - Supply: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.600", 15.24mm)
• Resolution (bits): 3.5bit
• Input Channel Type: Differential
• Data Interface: Parallel
• Supply Voltage Range - Analog: 5V
• Supply Current: 800µA
• Digital Ic Case Style: DIP
• No. Of Pins: 40
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 158-1128; 158-1128; TC7107ACPLR; TC7107ACPLR

TC7106/A/TC7107/A
8.0
8.1
The
differential inputs and accepts input signals within the
input stage common mode voltage range (V
typical range is V+ – 1.0 to V+ + 1V. Common mode
voltages are removed from the system when the
TC7106A/TC7107A operates from a battery or floating
power source (isolated from measured system) and
V
Figure
In systems where Common mode voltages exist, the
86 dB Common mode rejection ratio minimizes error.
Common mode voltages do, however, affect the
integrator output level. Integrator output saturation
must be prevented. A worst-case condition exists if a
large positive V
negative differential signal. The negative signal drives
the integrator output positive along with V
Figure
swing can be reduced below the recommended 2.0V
full scale swing. The integrator output will swing within
0.3V of V+ or V- without increasing linearity errors.
FIGURE 8-1:
Reduces Available Integrator Swing (V
DS21455D-page 16
IN
- is connected to analog common (V
+
–
V
V
CM
IN
TC7106A/TC7107A
8-2).
8-1). For such applications the integrator output
DEVICE PIN FUNCTIONAL
DESCRIPTION
Differential Signal Inputs
V
IN
+
–
+ (Pin 31), V
Input Buffer
CM
Where:
exists in conjunction with a full scale
Common Mode Voltage
T
C
R
V
I
R
I
I
I
= Integration Time
=
= Integration Capacitor
= Integration Resistor
I
is
IN
R
I
- (Pin 30)
T
I
C
designed
I
[
–
+
C
V
I
Integrator
CM
– V
COM
=
COM
with
CM
IN
4000
F
CM
OSC
≠
) (see
[
). The
V
V
(see
true
I
IN
).
8.2
The reference voltage can be generated anywhere
within the V+ to V- power supply range.
To prevent rollover type errors being induced by large
Common mode voltages, C
compared to stray node capacitance.
The TC7106A/TC7107A circuits have a significantly
lower analog common temperature coefficient. This
gives a very stable voltage suitable for use as a
reference. The temperature coefficient of analog
common is 20 ppm/°C typically.
8.3
The analog common pin is set at a voltage potential
approximately 3.0V below V+. The potential is between
2.7V and 3.35V below V+. Analog common is tied
internally to the N channel FET capable of sinking
20 mA. This FET will hold the common line at 3.0V
should an external load attempt to pull the common line
toward V+. Analog common source current is limited to
10 µA. Analog common is, therefore, easily pulled to a
more negative voltage (i.e., below V+ – 3.0V).
The TC7106A connects the internal V
inputs to analog common during the auto-zero cycle.
During the reference integrate phase, V
connected to analog common. If V
connected to analog common, a Common mode
voltage exists. This is rejected by the converter’s 86 dB
Common mode rejection ratio. In battery operation,
analog common and V
removing Common mode voltage concerns. In systems
where V- is connected to the power supply ground, or
to a given voltage, analog common should be
connected to V
Differential Reference
V
Analog Common (Pin 32)
REF
IN
+ (Pin 36), V
-.
© 2008 Microchip Technology Inc.
IN
- are usually connected,
REF
REF
IN
- (Pin 35)
should be large
- is not externally
IN
+ and V
IN
- is
IN
-