PHILIPS SA58603D

INTEGRATED CIRCUITS
SA58603
High precision operational amplifier,
comparator, and voltage reference
Product data
Supersedes data of 2001 Oct 03
2002 Nov 13
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
GENERAL DESCRIPTION
The SA58603 is comprised of a low voltage, high precision dual
operational amplifier, a comparator, and a reference voltage source.
The input offset voltage is typically 100 µV with a very low
temperature drift of ±1 µV/°C. The SA58603 supply current is
typically 100 µA per amplifier and it operates from 1.8 V to 6 V
single supply.
Having single power supply capability, low current consumption, low
offset voltage, low input offset current and low input bias current, the
SA58603 is ideal for battery-powered applications and amplification
of very small signals. It is excellent for precision amplifiers in gas
burners and gas pilot water heaters which use thermal couple heat
sensors.
FEATURES
Reference voltage section
• Reference voltage: 1.27 V ±50 mV
• Reference voltage temperature characteristics:
General
• Functionality to 1.8 V typical
• Low supply current: 100 µA per amplifier (typical)
±100 ppm/°C (typical)
• Output current: 0.3 mA (minimum)
Amplifier section
• Very low input offset voltage: 100 µV (typical)
• Very low input offset drift: ±1 µV/°C (typical)
• Low input offset current: 1 nA (typical)
• Input bias current: 50 nA (typical)
• Open loop gain: 100 dB (typical)
• Common mode input includes ground
APPLICATIONS
• Gas burners
• Gas water heaters
• Tankless gas water heaters
Comparator section
• Input offset voltage: ±1.0 mV (typical)
• Low input offset voltage voltage drift (–40 to +85 °C):
±10 µV (typical)
• Input bias current: 25 nA (typical)
• Output sink current: 5 mA (minimum)
SIMPLIFIED DEVICE DIAGRAM
VCC
8
AMPLIFIER
AOUT
3
AIN–
2
AIN+
1
COMPARATOR
7
R
22 kΩ
COMPOUT
1.27 V
4
6
5
GND
VS
COMPIN–
SL01536
Figure 1. Simplified device diagram.
2002 Nov 13
2
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
SA58603D
NAME
DESCRIPTION
TEMPERATURE
RANGE
SO8
plastic small outline package; 8 leads; body width 3.9 mm
–40 to +85 °C
PIN CONFIGURATION
TOP VIEW
AIN+
1
AIN–
2
8
VCC
7
COMPOUT
SO8
AOUT
3
6
VS
GND
4
5
COMIN–
SL01535
Figure 2. Pin configuration.
PIN DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1
AIN+
Non-inverting input of Op Amp. This is a PNP amplifier with the reference voltage as its supply voltage.
2
AIN–
Inverting input of Op Amp. This is a PNP amplifier with the reference voltage as its supply voltage.
3
AOUT
Output of Op Amp. This is a NPN emitter follower output with a 22 kΩ internal on-chip pull-down resistor. Its supply
voltage is VCC.
4
GND
Ground.
5
COMPIN–
Inverting input of Comparator. This is a PNP amplifier with VCC as its positive supply voltage.
6
VS
Reference voltage output. The output reference is typically 1.27 V. The output reference is derived from the series
combination of a NPN transistor (configured as a diode with the base shorted to the collector) and a 120 kΩ resistor.
7
COMPOUT
Output of Comparator. It is an open collector output stage which requires an external pull-up resistor.
8
VCC
Positive supply. Its operating range is 1.8 to 6.0 V.
2002 Nov 13
3
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
EQUIVALENT CIRCUITS
PIN
NUMBER
1
PIN NAME
PIN
NUMBER
INTERNAL EQUIVALENT CIRCUIT
VS
AIN+
5
PIN NAME
INTERNAL EQUIVALENT CIRCUIT
VS
COMPIN–
R
25 kΩ
R
43 kΩ
R
39 kΩ
R
18 kΩ
2
VS
AIN–
6
VS
VCC
R
120 kΩ
R
25 kΩ
R
18 kΩ
3
VCC
AOUT
7
COMPOUT
VCC
R
22 kΩ
R
47 kΩ
4
GND
8
VCC
MAXIMUM RATINGS
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
VCC
Single supply voltage
–0.3
+10
V
VIN
Input voltage
–0.3
+10
V
Tstg
Storage temperature
–40
+125
°C
Tamb
Operating temperature
–40
+85
°C
P
Power dissipation
–
300
mW
2002 Nov 13
4
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
ELECTRICAL CHARACTERISTICS
VCC = 3.0 V, VIN = 0 V, and Tamb = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
–
0.1
0.15
mA
ICC
Supply current
IOVS
Reference voltage output current
0.3
–
–
mA
VS
Reference voltage
1.22
1.27
1.32
V
∆VS
Reference voltage temperature drift
–
±100
–
ppm/°C
PSRR
Power supply rejection ratio
50
60
–
dB
VCC
Power supply voltage operating range
1.8
3.0
6.0
V
f = 100 Hz
Amplifier section (note 1)
VINA
Input voltage range
–0.2
–
0.3
V
VIOA
Input offset voltage
–
±0.1
±0.35
mV
∆VIO/∆T
Input offset voltage temperature drift
–
±1
±3
µV/°C
IIOA
Input offset current
–
1
10
nA
Ii(bias)A
Input bias current
–
50
150
nA
Gv(ol)A
Open-loop voltage gain
80
100
–
dB
IOA
Output current
VOA
Output voltage swing
Tamb = –20 to +75 °C
VIN = 10 mV; VO = 0.5 V
0.5
–
–
mA
VIN = –5 to +25 mV; RL = 10 kΩ
0.01
–
VCC – 1.0
V
Comparator section (note 2)
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
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
TYPICAL CHARACTERIZATION CURVES
Tamb = 25 °C, VCC = 3 V, VIN = 0 V, unless otherwise specified.
1.280
REFERENCE VOLTAGE, VS (V)
SUPPLY CURRENT, ICC (mA)
160
140
120
100
80
60
–50
1.276
1.272
1.268
1.264
–25
0
25
50
75
1.260
–50
100
–25
AMBIENT TEMPERATURE, Tamb (°C)
0
25
50
75
SL01915
SL01916
Figure 4. Reference voltage versus ambient temperature.
AMPLIFIER INPUT OFFSET CURRENT, I IOA (nA)
AMPLIFIER INPUT OFFSET VOLTAGE, VIOA (mV)
Figure 3. Supply current versus ambient temperature.
0.20
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
–50
–25
0
25
50
75
100
1.8
1.6
1.4
1.2
1.0
0.8
–50
–25
AMBIENT TEMPERATURE, Tamb (°C)
0
25
50
75
SL01917
Figure 6. Amplifier input offset current versus
ambient temperature.
54
3.0
AMPLIFIER OUTPUT CURRENT, IOA (mA)
AMPLIFIER INPUT BIAS CURRENT, I I(bias)A (nA)
Figure 5. Amplifier input offset voltage versus
ambient temperature.
53
52
51
50
–25
0
25
50
75
VIN = 10 mV
VOA = 0.5 V
2.5
2.0
1.5
1.0
0.5
–50
100
AMBIENT TEMPERATURE, Tamb (°C)
–25
0
25
50
75
100
AMBIENT TEMPERATURE, Tamb (°C)
SL01919
SL01918
Figure 7. Amplifier input bias current versus
ambient temperature.
2002 Nov 13
100
AMBIENT TEMPERATURE, Tamb (°C)
SL01920
49
–50
100
AMBIENT TEMPERATURE, Tamb (°C)
Figure 8. Amplifier output current versus ambient temperature.
6
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
TYPICAL CHARACTERIZATION CURVES (continued)
Tamb = 25 °C, VCC = 3 V, VIN = 0 V, unless otherwise specified.
VIN = –5 mV
RL = 10 kΩ
1.3
1.1
0.9
0.7
–50
2.40
AMPLIFIER OUTPUT VOLTAGE, HIGH, VOAH (V)
AMPLIFIER OUTPUT VOLTAGE, LOW, VOAL (mV)
1.5
–25
0
25
50
75
VIN = –5 mV
RL = 10 kΩ
2.35
2.30
2.25
2.20
2.15
–50
100
–25
AMBIENT TEMPERATURE, Tamb (°C)
0
25
50
75
SL01921
SL01922
Figure 10. Amplifier output voltage, HIGH
versus ambient temperature.
COMPARATOR INPUT BIAS CURRENT, II(bias)C (nA)
COMPARATOR INPUT OFFSET VOLTAGE, VIOC (mV)
Figure 9. Amplifier output voltage, LOW
versus ambient temperature.
1.6
VIN = –5 mV
1.4
1.2
1.0
0.8
0.6
–50
–25
0
25
50
75
100
25.6
VIN = –5 mV
25.5
25.4
25.3
25.2
25.1
25.0
24.9
–50
–25
AMBIENT TEMPERATURE, Tamb (°C)
0
25
50
75
SL01924
Figure 12. Comparator bias current versus
ambient temperature.
VIN = 10 mV
VOC = 0.4 V
30
I O(sink)C (mA)
COMPARATOR OUTPUT SINK CURRENT,
35
25
20
15
0
25
50
75
100
AMBIENT TEMPERATURE, Tamb (°C)
VIN = 10 mV
IO(sink)C = 5 mA
230
210
190
170
150
–50
–25
0
25
50
75
100
AMBIENT TEMPERATURE, Tamb (°C)
SL01925
SL01926
Figure 13. Comparator output sink current versus
ambient temperature.
2002 Nov 13
250
VSAT (mV)
COMPARATOR OUTPUT SATURATION VOLTAGE,
Figure 11. Comparator input offset voltage versus
ambient temperature.
–25
100
AMBIENT TEMPERATURE, Tamb (°C)
SL01923
10
–50
100
AMBIENT TEMPERATURE, Tamb (°C)
Figure 14. Comparator output saturation voltage versus
ambient temperature.
7
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
TYPICAL CHARACTERIZATION CURVES (continued)
Tamb = 25 °C, VCC = 3 V, VIN = 0 V, unless otherwise specified.
1.275
REFERENCE VOLTAGE, VS (V)
SUPPLY CURRENT, ICC (mA)
130
120
110
100
90
80
1.273
1.271
1.269
1.267
1.265
2
4
6
8
10
4
2
SUPPLY VOLTAGE, VCC (V)
6
8
SL01927
SL01928
Figure 16. Reference voltage versus supply voltage.
140
AMPLIFIER INPUT OFFSET CURRENT, I IOA (nV)
AMPLIFIER INPUT OFFSET VOLTAGE, VIOA (nV)
Figure 15. Supply current versus supply voltage.
130
120
110
100
90
2
4
6
8
1.4
1.2
1.0
0.8
0.6
0.4
2
10
4
SUPPLY VOLTAGE, VCC (V)
6
8
10
SUPPLY VOLTAGE, VCC (V)
SL01929
SL01930
Figure 17. Amplifier input offset voltage versus supply voltage.
Figure 18. Amplifier input offset current versus supply voltage.
51.0
3.5
AMPLIFIER OUTPUT CURRENT, IOA (mA)
AMPLIFIER INPUT BIAS CURRENT, I I(bias)A (nV)
10
SUPPLY VOLTAGE, VCC (V)
50.6
50.2
49.8
49.4
49.0
VIN = 10 mV
VOA = 0.5 V
3.1
2.7
2.3
1.9
1.5
2
4
6
8
2
10
SUPPLY VOLTAGE, VCC (V)
6
8
10
SUPPLY VOLTAGE, VCC (V)
SL01931
SL01932
Figure 19. Amplifier input bias current versus supply voltage.
2002 Nov 13
4
Figure 20. Amplifier output current versus supply voltage.
8
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
TYPICAL CHARACTERIZATION CURVES (continued)
1.8
AMPLIFIER OUTPUT VOLTAGE, HIGH, VOAH (V)
AMPLIFIER OUTPUT VOLTAGE, LOW, VOAL (mV)
Tamb = 25 °C, VCC = 3 V, VIN = 0 V, unless otherwise specified.
VIN = –5 mV
RL = 10 kΩ
1.7
1.6
1.5
1.4
1.3
1.2
1.1
4
2
6
8
10
VIN = 25 mV
RL = 10 kΩ
8
6
4
2
0
10
4
2
SUPPLY VOLTAGE, VCC (V)
6
8
SL01934
SL01933
Figure 22. Amplifier output voltage, HIGH
versus supply voltage.
1.10
30
VIN = –5 mV
COMPARATOR INPUT BIAS CURRENT,
I I(bias)A (nA)
COMPARATOR INPUT OFFSET VOLTAGE, VIOC (mV)
Figure 21. Amplifier output voltage, LOW
versus supply voltage.
1.08
1.06
1.04
1.02
1.00
0.98
VIN = –5 mV
29
28
27
26
25
24
4
2
6
8
10
2
4
SUPPLY VOLTAGE, VCC (V)
6
8
SL01937
Figure 24. Comparator bias current versus supply voltage.
COMPARATOR OUTPUT SATURATION VOLTAGE,
VSAT (mV)
Figure 23. Comparator input offset voltage
versus supply voltage.
21.4
VIN = 10 mV
VOC = 0.4 V
20.9
20.4
19.9
19.4
18.9
18.4
2
4
6
8
10
210
VIN = 10 mV
IO(sink)C = 5 mA
205
200
195
190
185
180
2
SUPPLY VOLTAGE, VCC (V)
4
6
8
10
SUPPLY VOLTAGE, VCC (V)
SL01936
SL01938
Figure 25. Comparator output sink current
versus supply voltage.
2002 Nov 13
10
SUPPLY VOLTAGE, VCC (V)
SL01935
COMPARATOR OUTPUT SINK CURRENT,
I O(sink)C (mA)
10
SUPPLY VOLTAGE, VCC (V)
Figure 26. Comparator output saturation voltage
versus supply voltage.
9
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
TYPICAL CHARACTERIZATION CURVES (continued)
0
100
OPEN LOOP VOLTAGE GAIN, GV(ol)A (dB)
POWER SUPPLY REJECTION RATIO, PSSR (dB)
Tamb = 25 °C, VCC = 3 V, VIN = 0 V, unless otherwise specified.
–10
–20
–30
–40
–50
–60
90
80
70
60
50
40
30
20
10
–70
1
0.1
10
0
0.01
100
0.1
1
FREQUENCY, f (kHz)
100
10
1000
SL01939
SL01940
Figure 27. Power supply rejection ratio versus frequency.
Figure 28. Amplifier open loop gain versus frequency.
COMPARATOR OUTPUT SATURATION VOLTAGE,
VSAT (mV)
REFERENCE VOLTAGE, VS (V)
1.34
1.29
1.24
1.19
1.14
1.09
0
1
2
3
4
5
OUTPUT CURRENT, IOA (mA)
600
VIN = 10 mV
500
400
300
200
100
0
0
5
10
15
20
25
OUTPUT SINK CURRENT, IO(sink)C (mA)
SL01941
SL01942
Figure 29. Reference voltage versus output current.
2002 Nov 13
10000
FREQUENCY, f (kHz)
Figure 30. Comparator output saturation voltage
versus sink current.
10
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
APPLICATION INFORMATION
Comparator output pull-up resistor
The comparator output pull-up resistor is determined by the
following formula:
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.
R+
ǒVCC * VSAT(max)Ǔ
I O(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:
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:
R5
(R4 ) R5)
V COMP + 1.27V
(R3 ) R2)
Av +
; Av (dB) = 20 log (Av); R3 = R1 k R2
R3
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 R2 ; R3 × R1 + R3 × R2 = R1 × R2:
(R1 ) R2)
R3 × R2 = R1 (R2 – R3)
Thus R1 + R3 R2 + 10.2W
(R2 * R3)
AMPLIFIER OUTPUT
ADC TO INPUT
VCC
8
3
PULL-UP
RESISTANCE
AMPLIFIER
R2
R1
THERMOCOUPLE
2
COMPARATOR
1
7
R3
R
22 kΩ
COMPARATOR
RESISTANCE
1.27 V
4
VCOMP
R5
6
5
R4
TO ADC AVREF
TO ADC AVSS
GND
SL01537
Figure 31. Typical flame detection circuit.
2002 Nov 13
11
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
PACKING METHOD
GUARD
BAND
TAPE
REEL
ASSEMBLY
TAPE DETAIL
COVER TAPE
CARRIER TAPE
BARCODE
LABEL
BOX
SL01305
Figure 32. Tape and reel packing method.
2002 Nov 13
12
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
SO8: plastic small outline package; 8 leads; body width 3.9 mm
pin 1 index
B2
1.73
4.95
4.80
0.51
0.33
0.068
0.189
0.195
0.013
0.020
4.95
4.80
SO8
2002 Nov 13
13
1.27
0.38
0.076
0.050
0.015
0.003
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
REVISION HISTORY
Rev
Date
Description
_2
20021113
Product data; second version (9397 750 10671). Supersedes SA58603_1 of 2001 Oct 03
(9397 750 08955).
Engineering Change Notice 853–2289 29151 (date: 20021105).
Modifications:
• Add “Typical characterization curves” section.
_1
20011003
Product data; initial version (9397 750 08955).
Engineering Change Notice 853–2289 27197 (date: 20011003).
2002 Nov 13
14
Philips Semiconductors
Product data
High precision operational amplifier,
comparator, and voltage reference
SA58603
Data sheet status
Level
Data sheet status [1]
Product
status [2] [3]
Definitions
I
Objective data
Development
This data sheet contains data from the objective specification for product development.
Philips Semiconductors reserves the right to change the specification in any manner without notice.
II
Preliminary data
Qualification
This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
III
Product data
Production
This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL
http://www.semiconductors.philips.com.
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given
in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no
representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be
expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree
to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes in the products—including circuits, standard cells, and/or software—described
or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated
via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys
no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent,
copyright, or mask work right infringement, unless otherwise specified.
 Koninklijke Philips Electronics N.V. 2002
All rights reserved. Printed in U.S.A.
Contact information
For additional information please visit
http://www.semiconductors.philips.com.
Fax: +31 40 27 24825
Date of release: 11-02
For sales offices addresses send e-mail to:
[email protected].
Document order number:
2002 Nov 13
15
9397 750 10671