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參數(shù)資料
| 型號： | TC500 |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | PRECISION ANALOG FRONT ENDS |
| 中文描述： | 精密模擬前端 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 209K |
| 代理商： | TC500 |
3-31
TELCOM SEMICONDUCTOR, INC.
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PRECISION ANALOG FRONT ENDS
TC500
TC500A
TC510
TC514
USING THE TC510/514
Negative Supply Voltage Converter (TC510, TC514)
A capacitive charge pump is employed to invert the
voltage on V
DD
for negative bias within the TC510/514. This
voltage is also available on the V
–OUT
pin to provide negative
bias elsewhere in the system. Two external capacitors are
required to perform the conversion.
Timing is generated by an internal state machine driven
from an on-board oscillator. During the first phase, capacitor
C
F
is switched across the power supply and charged to V
+
This charge is transferred to capacitor C
–OUT
during the
second phase. The oscillator normally runs at 100kHz to
ensure minimum output ripple. This frequency can be re-
duced by placing a capacitor from OSC to V
DD
. The relation-
ship between the capacitor value is shown in the typical
characteristics curves at the end of this data sheet.
S
.
Analog Input Multiplexer (TC514)
The TC514 is equipped with a four input differential
analog multiplexer. Input channels are selected using select
inputs (A1, A0). These are high-true control signals
(i.e., channel 0 is selected when (A1, A0 = 00).
EVALUATION KIT (TC500EV)
The TC500EV consists of a pre-assembled, 4 inch by 6
inch printed circuit board that connects to the serial port of
any PC or dumb terminal. Design software is also included.
TC500EV helps reduce design time and optimize converter
performance. Please contact your local TelCom representa-
tive for more information.
Design Example
Given:
Required Resolution:
Maximum V
IN
:
Power Supply Voltage: +5V
60Hz System
16 Bits (65,536 counts).
±
2V
Step 1:
Pick integration time (t
INT
) as a multiple of the
line frequency:
1/60Hz = 16.6msec. Use 4x line frequency = 66msec
Step 2:
Calculate R
INT
R
INT
(in M
) = V
INMAX
/20 = 2/20 = 100k
Step 3:
Calculate C
INT
for maximum (4V) integrator
output swing:
C
INT
(in
μ
F) = (t
INT
) (20 x 10
–6
) / (V
S
– 0.9)
= (.066) (20 x 10
–6
) / (4.1)
= .32
μ
F (use closest value: 0.33
μ
F)
NOTE: TelCom recommended capacitor:
WIMA p/n: MK12 .33/63/10
Step 4:
Choose C
REF
and C
AZ
based on conversion rate
:
Conversions/sec
= 1/(t
AZ
+ t
INT
+ 2 t
INT
+ 2msec)
= 1
/(66msec + 66msec +132msec+2msec)
= 3.7 conversions/sec
From which C
AZ
= C
REF
= 0.22
μ
F (see Table 1)
NOTE: TelCom recommended capacitor:
WIMA p/n: MK12 .22/63/10
Step 5:
Calculate V
REF
V
REF
(in Volts) = (V
S
– 0.9) (C
INT
) (R
INT
)
2(t
INT
)
= (4.1) (0.33 x 10
–6
) (10
5
) / 2(.066)
= 1.025V
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