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參數(shù)資料
| 型號(hào)： | SA58603 |
| 廠(chǎng)商： | NXP Semiconductors N.V. |
| 英文描述： | High precision operational amplifier, comparator, and voltage reference |
| 中文描述： | 高精度運(yùn)算放大器，比較器，電壓基準(zhǔn) |
| 文件頁(yè)數(shù)： | 11/15頁(yè) |
| 文件大小： | 133K |
| 代理商： | SA58603 |
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Philips Semiconductors
Product data
SA58603
High precision operational amplifier,
comparator, and voltage reference
2002 Nov 13
11
APPLICATION INFORMATION
Typical gas pilot detection circuit
Figure 31 shows a typical application of the SA58603 in which the
input amplifier is driven by a thermocouple heated by the pilot flame
in a water heater or gas burner. The circuit comparator may be
programmed to detect when the pilot is out. The IC is operated from
a single voltage supply making it capable of battery backup with loss
of AC power. It may be operated from a one-cell Lithium battery or
two alkaline cells. 10 nF bypass capacitors are placed from V
CC
and
reference voltage output (pin 6) to ground to filter power supply
noise and interference from external noise sources.
Selecting external components
Gain
Recommended amplifier gain is 40 dB. The gain is is set by the
combination of R1, R2, and R3 as shown in the following equations:
Av
(R3
R2)
R3
; Av (dB) = 20 log (Av); R3 = R1 R2
For a gain of 40 dB, Av = 100 V/V;
if R2 = 1 k
, then 99*R3 = 1 k
; R3 = 10.1
.
R3
R1
(R1
R2
×
R1 + R3
×
R2 = R1
×
R2:
R3
×
R2 = R1 (R2 – R3)
Thus R1
R3
(R2
R2
R3)
10.2
Comparator output pull-up resistor
The comparator output pull-up resistor is determined by the
following formula:
R
V
CC
V
SAT(max)
I
O(sink)(min)
where V
SAT(max)
= 400 mV, and I
O(sink)(min)
= 5 mA.
Comparator threshold voltage
The comparator threshold voltage is determined by R4 and R5.
They form a voltage divider from the reference voltage output (V
S
,
Pin 6) to ground. In the application example, V
COMP
, the comparator
input (COMPIN–, Pin 5) is connected to the junction of R4 and R5.
The input level is calculated by following relationship:
V
COMP
1.27V
R5
(R4
R5)
7
2
1
GND
1.27 V
R
22 k
COMPARATOR
RESISTANCE
5
8
COMPARATOR
V
CC
AMPLIFIER
SL01537
AMPLIFIER OUTPUT
ADC TO INPUT
PULL-UP
RESISTANCE
4
R5
R4
6
V
COMP
TO ADC AV
REF
TO ADC AV
SS
3
THERMOCOUPLE
R1
R3
R2
Figure 31. Typical flame detection circuit.
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