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PDF SA58603 Data sheet ( Hoja de datos )
| Número de pieza | SA58603 | |
| Descripción | High precision operational amplifier | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
SA58603
High precision operational amplifier,
comparator, and voltage reference
Product data
Supersedes data of 2001 Oct 03
2002 Nov 13
Philips
Semiconductors
1 page  
Philips Semiconductors
High precision operational amplifier,
comparator, and voltage reference
Product data
SA58603
ELECTRICAL CHARACTERISTICS
VCC = 3.0 V, VIN = 0 V, and Tamb = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
ICC
IOVS
VS
∆VS
PSRR
Supply current
Reference voltage output current
Reference voltage
Reference voltage temperature drift
Power supply rejection ratio
f = 100 Hz
– 0.1
0.3 –
1.22 1.27
– ±100
50 60
0.15 mA
– mA
1.32 V
– ppm/°C
– dB
VCC Power supply voltage operating range
Amplifier section (note 1)
1.8 3.0 6.0 V
VINA
Input voltage range
VIOA
Input offset voltage
∆VIO/∆T Input offset voltage temperature drift
IIOA Input offset current
Ii(bias)A
Input bias current
Gv(ol)A
Open-loop voltage gain
IOA Output current
VOA Output voltage swing
Comparator section (note 2)
Tamb = –20 to +75 °C
VIN = 10 mV; VO = 0.5 V
VIN = –5 to +25 mV; RL = 10 kΩ
–0.2
–
–
–
–
80
0.5
0.01
–
±0.1
±1
1
50
100
–
–
0.3
±0.35
±3
10
150
–
–
VCC – 1.0
V
mV
µV/°C
nA
nA
dB
mA
V
VIOC
Input offset voltage
VIN = –5 mV
– ±1.0 ±3.5 mV
∆VIOC/∆T Input offset voltage temperature drift
VIN = –5 mV
– ±10 ±30 µV/°C
Ii(bias)C
Input bias current
VIN = –5 mV
– 25 75 nA
IO(sink)
Output sink current
VIN = 10 mV; VO = 0.4 V
5–
– mA
ILO Output leakage current
VO = VCC + 1 V
– – 0.2 µA
VSAT
Output saturation voltage
VIN = 10 mV; IO(sink) = 5 mA
– 200 400 mV
NOTES:
1. Amplifier output is emitter follower with an on-chip 22 kΩ pull-down resistor.
2. Comparator output is open collector; it requires an external pull-up resistor. See application section on how to determine this resistor.
2002 Nov 13
5
5 Page 
Philips Semiconductors
High precision operational amplifier,
comparator, and voltage reference
Product data
SA58603
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 VCC 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
k
R2
For a gain of 40 dB, Av = 100 V/V;
if R2 = 1 kΩ, then 99*R3 = 1 kΩ; R3 = 10.1 Ω.
R3
+
R1
(R1
)
R2
R2)
;
R3
×
R1
+
R3
×
R2
=
R1
×
R2:
R3 × R2 = R1 (R2 – R3)
Thus
R1
+
R3
(R2
*
R2
R3)
+
10.2W
Comparator output pull-up resistor
The comparator output pull-up resistor is determined by the
following formula:
ǒ ǓVCC * VSAT(max)
R+
IO(sink)(min)
where VSAT(max) = 400 mV, and IO(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 (VS,
Pin 6) to ground. In the application example, VCOMP, the comparator
input (COMPIN–, Pin 5) is connected to the junction of R4 and R5.
The input level is calculated by following relationship:
VCOMP + 1.27V
R5
(R4 ) R5)
THERMOCOUPLE
AMPLIFIER OUTPUT
ADC TO INPUT
R2
R1
R3
3
2
1
VCC
8
AMPLIFIER
R
22 kΩ
1.27 V
COMPARATOR
PULL-UP
RESISTANCE
7
COMPARATOR
RESISTANCE
4 VCOMP 6
R5 R4
5
GND
Figure 31. Typical flame detection circuit.
TO ADC AVREF
TO ADC AVSS
SL01537
2002 Nov 13
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SA58603.PDF ] | |
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