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TC811 датащи(PDF) 9 Page - TelCom Semiconductor, Inc

номер детали TC811
подробное описание детали  3-1/2 DIGIT A/D CONVERTER WITH HOLD AND DIFFERENTIAL REFERENCE INPUTS
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производитель  TELCOM [TelCom Semiconductor, Inc]
домашняя страница  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC811 датащи(HTML) 9 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
7
6
5
4
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1
2
8
3-1/2 DIGIT A/D CONVERTER WITH HOLD AND
DIFFERENTIAL REFERENCE INPUTS
TC811
Figure 6b.
Figure 7. Common-Mode Voltage Removed in Battery Operation With V
IN = Analog Common
inputs permit ratiometric measurements and simplify inter-
facing with sensors such as load cells and temperature
sensors. The TC811 is ideally suited to applications in hand-
held multimeters, panel meters, and portable instrumenta-
tion. The reference voltage can be generated anywhere
within the V+ to Vpower supply range.
To prevent rollover type errors from being induced by
large common-mode voltages, CREF should be large com-
pared to stray node capacitance. A 0.1
µF capacitor is a
typical value.
The TC811 offers a significantly improved Analog Com-
mon temperature coefficient. This provides a very stable
voltage suitable for use as a voltage reference. The tem-
perature coefficient of Analog Common is typically
35ppm/
°C.
DEVICE PIN FUNCTIONAL DESCRIPTION
Differential Signal Inputs (VIN+ (Pin 31),
VIN– (Pin 30))
The TC811 is designed with true differential inputs and
accepts input signals within the input stage common mode
voltage range (VCM). The typical range is V+ – 1.0 to V+
1.5V. Common-mode voltages are removed from the sys-
tem when the TC811 operates from a battery or floating
power source (isolated from measured system) and VIN– is
connected to Analog Common. (see Figure 8)
In systems where common-mode voltages exist, the
86dB common-mode rejection ratio minimizes error. Com-
mon-mode voltages do, however, affect the integrator out-
put level. A worse case condition exists if a large positive
VCM exists in conjunction with a full-scale negative differen-
tial signal. The negative signal drives the integrator output
positive along with VCM (Figure 8). For such applications the
integrator output swing can be reduced below the recom-
mended 2.0V full-scale swing. The integrator output will
swing within 0.3V of V+ or Vwithout increased linearity
error.
Reference (V
+
REF (Pin 36), V
REF (Pin 33)
Unlike the ICL7116, the TC811 has a differential refer-
ence as well as the “hold” function. The differential reference
Oscillator
Full-Scale Voltage (VFS)
Freq. (kHz)
200mV
2.0V
RINT
CINT
RINT
CINT
32.768
180k
0.068
µF
1.8M
0.068
µF
40
150k
0.068
µF
1.5M
0.068
µF
VBUF
CAZ VINT
BP
POL
SEGMENT
DRIVE
OSC1
OSC2
V
V
+
VREF
+
VREF
ANALOG
COMMON
V
V
+
V
V
+
GND
GND
MEASURED
SYSTEM
POWER
SOURCE
9V
LCD DISPLAY
TC811
+
V
V
+
470k
V +
20M
V +
20 pF
10pF
40kHZ
Figure 8.
Common-Mode Voltage Reduces Available
Integrator Swing. (VCOM ≠ VIN)
RI
+
VIN
V
C I
INTEGRATOR
VI =
[
[
VCM
VIN
INPUT
BUFFER
CI =
=
RI
INTEGRATION CAPACITOR
INTEGRATION RESISTOR
4000
f
INTEGRATION TIME
TI ==
Where:
VI
CM
OSC
+
+
TI
RI CI


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