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參數(shù)資料
| 型號(hào)： | TC8129CKW |
| 元件分類： | ADC |
| 英文描述： | 1-CH PROPRIETARY METHOD ADC, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大?。?/td> | 137K |
| 代理商： | TC8129CKW |
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TC8129
TC8129 - 3/29/96-2
2001 Microchip Technology Inc.
DS21473A
4C\VDigit Auto-Ranging DMM ADC
COMPONENT SOURCES
Multiple sources are available for most external com-
ponents used with the TC8129. Prototyping quantities of
the crystal are available from:
Digikey
1-800-344-4539
Thief River Falls, MN
Crystal:
Mfg:
EPSON AMERICA
Part#:
C-002RX 32.738K-A
Digikey#:
SE3202
A test socket for the TC8129 44-Pin package is avail-
able from:
ENPLAS
Part#
FPQ-80-0.8-11A
Vendor:
TESCO International Inc.
Phone:
(415) 572-1683
FAX: (415) 341-1509
A suggested source for the input voltage divider resis-
tor network is:
Caddock Electronics
1717 Chicago Ave.
Riverside, CA 92507
Phone:
(909) 788-1700
FAX: (909) 369-1151
Part#
1776-C441
Reference Capacitor (CREF)
For best performance, the reference capacitor must
have very low leakage. Polypropylene dielectric is recom-
mended, but polyester or other dielectrics may also give
acceptable results. A value of 0.1
F is recommended.
Reference Voltages
The TC8129 requires three reference voltages for re-
sistance, voltage and capacitance measurements. All three
voltages can be derived from one external voltage refer-
ence, such as the TC04.
The resistor reference voltage, VREFR, sets an internal
bias voltage for resistance measurements. VREFR is typi-
cally 1.25V. Resistance is measured ratiometrically, so the
absolute value of VREFR will not affect the accuracy of
resistance measurements.
The reference voltage for voltage measurements is
applied to the V
+
REF pin. This voltage should be adjusted to
+545mV for 60Hz measurements or +655mV for 50Hz
measurements.
Capacitance measurements are trimmed by adjusting
the VHCTRM and VLCTRM voltages. Typical voltages for the
VHCTRM and VLCTRM are 150mV and 1.4V respectively.
Typical trim range required is
±20mV and ±150mV for
VHCTRM and VLCTRM respectively.
AC TO DC CONVERTER
The TC8129 will measure voltage and current in both
DC and AC modes. When the AC mode is selected, the
input signal is internally switched to an AC-to-DC con-
verter. The AC mode is selected by setting bit B0 of the
command word to a logic “1”.
Internal AC to DC Converter
The TC8129’s on-chip op-amp can be combined with
external components to form an AC-to-DC converter. See
typical application schematic.
External AC to DC Converter
An external AC-to-DC converter, such as the Analog
Devices AD737, can also be used (Figure 13). This circuit
will provide true RMS conversions.
Frequency Buffering
The frequency input of the TC8129 requires a logic
swing from V
+
S to DGND1. An external buffer, to boost the
input signal amplitude, will be required in most applica-
tions. In addition, the signal to be measured is typically
referenced to the DMM’s COMMON input, which is con-
nected to the TC8129’s analog COMMON. Therefore a
level shifter is required to shift the logic LOW level from
analog COMMON to DGND1. The AC-coupled buffer shown
in the Typical Application diagram provides both level shift-
ing and voltage amplification.
Figure 13. Truer RMS AC -to-DC Conversion
100
10
F
10
F
33
F
+9V
7
TC8129
8
2
1
4
0V
COM
OUT
PDOWN
CAV
6
3
5
CC
V–S
V+S
VIN
ACVH
ADI
20
ACVL
19
18
+
–
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