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TC530 Folha de dados(PDF) 10 Page - TelCom Semiconductor, Inc

Nome de Peças TC530
Descrição Electrónicos  5V PRECISION DATA ACQUISITION SUBSYSTEMS
Download  15 Pages
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Fabricante Electrônico  TELCOM [TelCom Semiconductor, Inc]
Página de início  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC530 Folha de dados(HTML) 10 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
5V PRECISION DATA ACQUISITION
SUBSYSTEMS
TC530
TC534
20
VINMAX
RINT (MΩ) =
where: VINMAX = Maximum Input Voltage (full count
voltage)
RINT
= Integrating Resistor (in M
Ω)
For loop stability, RINT should be ≥ 50kΩ.
(2) Select Reference (CREF) and Auto Zero (CAZ)
Capacitors
CREF and CAZ must be low leakage capacitors (such
as polypropylene). The slower the conversion rate,
the larger the value CREF must be. Recommended
capacitors for CREF and CAZ are shown in Table 1.
Larger values for CAZ and CREF may also be used to
limit roll-over errors.
Table 1. CREF and CAZ Selection
Conversions Typical Value of Suggested *
Per Second
CREF, CAZ (
µF) Part Number
>7
0.1
WIMA MK12 .1/63/20
2 to 7
0.22
WIMA MK12 .22/63/20
2 or less
0.47
WIMA MK12 .47/63/20
*WIMA Corp. listing on the last page of this data sheet.
3. Calculate Integrating Capacitor (CINT)
The integrating capacitor must be selected to maxi-
mize integrator output voltage swing. The integrator
output voltage swing is defined as the absolute value
of VDD (or VSS) less 0.9V (i.e. |VDD – 0.9V| or |VSS +
0.9V|). Using the 20
µA buffer maximum output
current, the value of the integrating capacitor is
calculated using the following equation:
(VS – 0.9)
(tINT)(20)
CINT (µF) =
where: tINT
= Integration Period
VS
= Applied Supply Voltage
CINT
= Integrator Capacitor Value (in
µF)
It is critical that the integrating capacitor have a very
low dielectric absorption. PPS capacitors are an
example of one such chemistry. Table 2 summa-
rizes various capacitors suitable for CINT.
Value
Suggested Part Number*
0.1
WIMA MK12 .1/63/20
0.22
WIMA MK12 .22/63/20
0.33
WIMA MK12 .33/63/20
0.47
WIMA MK12 .47/63/20
*WIMA Corp. listing on the last page of this data sheet.
4. Calculate VREF
The reference deintegration voltage is calculated
using:
VREF (in Volts) =
(VS – 0.9)(CINT)(RINT)
2(tINT)
Serial Port
Communication with the TC530/534 is accomplished
over a 3 wire serial port. Data is clocked into DIN on the rising
edge of DCLK and clocked out of DOUT on the falling edge of
DCLK. R/W must be HIGH to read converted data from the
serial port and LOW to write the LOAD VALUE to the TC530/
534.
Load Value Write Cycle (Figure 4)
Following the power-up reset pulse, the LOAD VALUE
(which sets the duration of AZ and INT) must next be
transmitted to the serial port. To accomplish this, the proces-
sor monitors the state of EOC (which is available as a
hardware output or at DOUT). R/W is taken low to initiate the
write cycle only when EOC is low (during the AZ phase).
(Failure to observe EOC low may cause an offset voltage to
be developed across CINT resulting in erroneous readings).
The 8 bit LOAD VALUE data on DIN is clocked in by DCLK.
The processor then terminates the write cycle by taking
R/W high. (Data is transferred from the serial input shift
register to the time base counter on the rising edge of R/W,
and data conversion is initiated).
Data Read Cycle (Figure 5)
Data is shifted out of the serial port in the following order:
End of Conversion (EOC), Overrange (OVR), Sign (SGN),
conversion data (MSB first). When R/W is high, the state of
the EOC bit can be polled by simply reading the state of
DOUT. This allows the processor to determine if new data is
available without connecting an additional wire to the EOC
output pin (this is especially useful in a polled environment).
Input Multiplexer (TC534 Only)
A 4 input, differential multiplexer is included in the
TC534. The states of channel address lines A0 and A1
determine which differential VIN pair is routed to the con-
Table 2. Recommend Capacitor for CINT


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