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TC7126CPL Datasheet(PDF) 10 Page - TelCom Semiconductor, Inc

No. de pieza TC7126CPL
Descripción Electrónicos  3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
Download  13 Pages
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Fabricante Electrónico  TELCOM [TelCom Semiconductor, Inc]
Página de inicio  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC7126CPL Datasheet(HTML) 10 Page - TelCom Semiconductor, Inc

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3-226
TELCOM SEMICONDUCTOR, INC.
3-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTERS
TC7126
TC7126A
Figure 5. Common-Mode Voltage Removed in Battery Operation With VIN = Analog Common
100
µA. This FET will hold the common line at 3V should an
external load attempt to pull the common line toward V+.
Analog common source current is limited to 1
µA. Therefore,
analog common is easily pulled to a more negative voltage
(i.e., below V+ – 3V).
The TC7126A connects the internal V
+
IN and V
IN in-
puts to analog common during the auto-zero phase. During
the reference-integrate phase, V
IN is connected to analog
common. If V
+
IN is not externally connected to analog com-
mon, a common-mode voltage exists, but is rejected by the
converter's 86 dB common-mode rejection ratio. In battery
operation, analog common and V
IN are usually connected,
removing common-mode voltage concerns. In systems where
V
IN is connected to power supply ground or to a given
voltage, analog common should be connected to V
IN.
The analog common pin serves to set the analog sec-
tion reference, or common point. The TC7126A is specifi-
cally designed to operate from a battery or in any measure-
ment system where input signals are not referenced (float)
with respect to the TC7126A's power source. The analog
common potential of V+ –3V gives a 7V end of battery life
voltage. The common potential has a 0.001%/% voltage
coefficient and a 15
Ω output impedance.
With sufficiently high total supply voltage (V+–V>7V),
analog common is a very stable potential with excellent
temperature stability (typically 35 ppm/
°c). This potential
can be used to generate the TC7126A's reference voltage.
An external voltage reference will be unnecessary in most
cases because of the 35 ppm/
°C temperature coefficient.
See "TC7126A Internal Voltage Reference" discussion.
TEST (Pin 37)
The TEST pin potential is 5V less than V+. TEST may be
used as the negative power supply connection for external
CMOS logic. The TEST pin is tied to the internally-generated
negative logic supply through a 500
Ω resistor. The TEST pin
load should not be more than 1 mA. See "Digital Section" for
additional information on using TEST as a negative digital
logic supply.
If TEST is pulled HIGH (to V+), all segments plus the
minus sign will be activated. DO NOT OPERATE IN THIS
MODE FOR MORE THAN SEVERAL MINUTES. With
TEST= V+, the LCD segments are impressed with a DC
voltage which will destroy the LCD.
TC7126A Internal Voltage Reference
The TC7126A's analog common voltage temperature
stability has been significantly improved (Figure 7). The "A"
version of the industry-standard TC7126 device allows
users to upgrade old systems and design new systems
without external voltage references. External R and C val-
ues do not need to be changed. Figure 10 shows analog
common supplying the necessary voltage reference for the
TC7126A.
VBUFF
CAZ VINT
BP
POL
SEGMENT
DRIVE
OSC1
OSC3
OSC2
V
V
+
VREF
+
VREF
ANALOG
COMMON
V
V
+
V
V
+
GND
GND
MEASURED
SYSTEM
POWER
SOURCE
9V
LCD
TC7126A
+
V
V
+
IN
IN
Figure 6. Common-Mode Voltage Reduces Available Integrator
Swing (VCOM
V
IN)
RI
+
VIN
V
C I
INTEGRATOR
VI =
[
[
VCM
VIN
INPUT
BUFFER
CI =
=
RI
Integration capacitor
Integration resistor
4000
f
Integration time
T I ==
Where:
VI
CM
OSC
+
+
TI
RI CI


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