RT2902
D
SO14
(plastic micropackage)
Pin connections (top view)
Output 1 1
Inverting Input 1 2
Non-inverting Input 1 3
V
CC
+ 4
Non-inverting Input 2 5
Inverting Input 2 6
Output 2 7
-
+
+
-
+
-
-
+
14 Output 4
13 Inverting Input 4
12 Non-invertin g Input 4
11 V
CC
-
10 Non-invertin g Input 3
9 Inverting Input 3
8 Output 3
Features
• Wide gain bandwidth: 1.3 MHz
• Input common-mode voltage range includes negative rail
• Large voltage gain: 100 dB
• Very low supply current per amplifier: 375 µA
• Low input bias current: 20 nA
• Low input offset current: 2 nA
• Wide power supply range:
– Single supply: 3 V to 30 V
– Dual supplies: ±1.5 V to ±15 V
• Intended for use in aerospace and defense applications :
– Dedicated traceability and part marking
– Approval documents available for production parts
– Adapted extended life time and obsolescence management
RobuST low-power quad operational amplifier
Datasheet
-
production data
– Extended product change notification process
– Designed and manufactured to meet sub ppm quality goals
– Advanced mold and frame designs for superior resilience to harsh environments
(acceleration, EMI, thermal, humidity)
– Extended screening capability on request
– Single fabrication, assembly, and test site
– Temperature range (-40 °C to 125 °C)
Applications
• Aerospace and defense
• Harsh environments
Description
This circuit consists of four independent, high gain operational amplifiers which employ internal frequency compensation and are specifically designed for aerospace and defense systems.
The device operates from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the lowpower supply current drain is independent from the power supply voltage magnitude.
October 2014
This is information on a product in full production.
DocID026928 Rev 1 1/16 www.st.com
6
7
3
4
1
2
5
Contents
Contents
RT2902
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical single-supply applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1
SO14 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16 DocID026928 Rev 1
RT2902
1
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Symbol
V
CC
V id
V in
T j
I in
T stg
R thja
R thjc
ESD
Table 1. Absolute maximum ratings (AMR)
Parameter Value
Supply voltage
(1)
Differential input voltage (2)
Input voltage
Output short-circuit duration
(3)
Maximum junction temperature
Input current
(4)
: V in
driven negative
±16 to 33
32
-0.3 to 32
Infinite
150
5 in DC or 50 in AC
(duty cycle = 10 %, T = 1 s)
Input current (5) : V in
AMR value
driven positive above
Storage temperature range
Thermal resistance junction to ambient
(6)
Thermal resistance junction to case
(6)
HBM: human body model
(7)
MM: machine model (8)
CDM: charged device model
(9)
0.4
-65 to 150
105
31
370
150
1500
Unit
V s
°C mA
°C
°C/W
V
1. All voltage values, except the differential voltage are with respect to network ground terminal.
2. Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.
3. Short-circuit from the output to V
CC
+ can cause excessive heating and eventual destruction. The maximum output current is approximately 20 mA, independent of the magnitude of V
CC
.
4. This input current only exists when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP transistor becoming forward-biased and thereby acting as an input diode clamp. In addition to this diode action, there is an NPN parasitic action on the IC chip. This transistor action can cause the output voltages of the op amp to go to the V
CC
voltage level (or to ground for a large overdrive) for the time during which an input is driven negative. This is not destructive and normal output is restored for input voltages above -0.3 V.
5. The junction base/substrate of the input PNP transistor polarized in reverse must be protected by a resistor in series with the inputs to limit the input current to 400 µA max (R = (Vin - 36 V)/400 µA).
6. R thja/c
are typical values
7. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 k Ω resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
8. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 connected pin combinations while the other pins are floating.
Ω ). This is done for all couples of
9. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins.
DocID026928 Rev 1 3/16
16
Absolute maximum ratings and operating conditions
Symbol
V
CC
V icm
T oper
Table 2. Operating conditions
Parameter
Supply voltage
Common mode input voltage range
T min
≤ T amb
≤ max
Operating free-air temperature range
Value
3 to 30
(V
CC
+
) - 1.5
(V
CC
+
) - 2
-40 to 125
RT2902
Unit
V
°C
4/16 DocID026928 Rev 1
RT2902
Figure 1. Schematic diagram (1/4 RT2902)
Schematic diagram
DocID026928 Rev 1 5/16
16
Electrical characteristics RT2902
6/16
Table 3. V
CC
+ = 5 V, V
CC
= ground, V o
= 1.4 V, T
(unless otherwise specified) amb
= 25 °C
Parameter Min.
Typ.
Max.
Unit Symbol
Input offset voltage
(1)
V io
Input offset voltage (1)
, T min
≤ T amb
≤ max
Δ V io
/ Δ T Input offset voltage drift
Input offset current
I io
Input offset current, T min
≤ amb
≤ T max
DI io
Input offset current drift
Input bias current
(2)
I ib
Input bias current
(2) , T
min
≤ amb
≤ T max
Large signal voltage gain
(V
CC
+
= 15 V, R
L
= 2 k Ω , V o
= 1.4 V to 11.4 V)
A vd Large signal voltage gain
(V
CC
+
= 15 V, R
L
= 2 k Ω , V o
= 1.4 V to 11.4 V),
T min
≤ amb
≤ T max
Supply voltage rejection ratio (R
S
≤ 10 k Ω)
SVR
Supply voltage rejection ratio (R
S
T min
≤ amb
T max
≤ 10 k Ω) ,
I
CMR
I
V
I cc
O sink
OH
Supply current, all amps, no load
V
V
CC
+
CC
+
= 5 V
= 30 V
T min
V
V
≤
CC
+
CC
+ amb
T
= 5 V
= 30 V max
Common-mode rejection ratio (R
S
≤ 10 k Ω )
Common-mode rejection ratio (R
S
≤ 10 k Ω ),
T min
≤ amb
T max
Output short-circuit current
(V id
= 1 V, V
CC
+
= 15 V, V o
= 2 V)
Output sink current (V id
= -1 V)
V
V
CC
+
CC
+
= 15 V, V o
= 15 V, V o
= 2 V
= 0.2 V
High level output voltage (V
CC
+
= 30 V)
R
T
T
V
T
L
R
L
= 2 k Ω min min
CC
+ min
≤
≤
≤
T amb
≤ T max
= 10 k Ω
T amb
T amb
≤
= 5 V, R
L max
= 2 k Ω
≤ T max
50
25
65
65
70
60
20
10
12
26
26
27
27
3
3.5
2
10
20
7
2
100
110
0.7
1.5
0.8
1.5
80
40
20
50
27
28
7
9
30
30
µV/°C nA
40
200 pA/°C
150
300
1.2
3
1.2
3
70 mV nA
V/mV dB mA dB mA mA
µA
V
DocID026928 Rev 1
RT2902 Electrical characteristics
Table 3. V
CC
+ = 5 V, V
CC
= ground, V o
= 1.4 V, T amb
(unless otherwise specified) (continued)
= 25 °C
Parameter Min.
Typ.
Max.
Unit Symbol
V
OL
SR
Low level output voltage (R
L
= 10 k Ω )
Low level output voltage (R
L
= 10 k Ω ),
T min
≤ amb
T max
Slew rate
(V
C
L
CC
+
= 15 V, V in
= 0.5 to 3 V, R
= 100 pF, unity gain)
L
= 2 k Ω ,
5
0.4
20
20 mV
V/µs
GBP
THD
Gain bandwidth product
(V
CC
+ = 30 V, V in
= 10 mV, R
L
= 2 k Ω , C
L
= 100 pF)
Total harmonic distortion
(f = 1 kHz, A
C
L
V
= 20 dB, R
= 100 pF, V
CC
+
L
= 2 k Ω , V o
= 2 V
= 30 V) pp
,
1.3
0.015
MHz
%
V
O1 e n
/V
O2
Equivalent input noise voltage
(f = 1 kHz, R
S
= 100 Ω , V
CC
+
= 30 V)
Channel separation (3)
(1 kHz ≤ f ≤ 20 kHz)
40
120
1. V
O
= 1.4 V, R
S
= 0 Ω , 5 V < V
CC
+
< 30 V, 0 V < V ic
< (V
CC
+
) - 1.5 V.
2. The direction of the input current is out of the IC. This current is essentially constant, independent of the state of the output, so there is no change in the loading charge on the input lines.
Hz dB
3. Due to the proximity of external components ensure stray capacitance does not cause coupling between these external parts. This typically can be detected as this type of capacitance increases at higher frequencies.
DocID026928 Rev 1 7/16
16
Electrical characteristics
Figure 2. Input bias current vs. T amb
Figure 3. Input voltage range
RT2902
Figure 4. Current limiting Figure 5. Supply current
8/16
Figure 6. Gain bandwidth product Figure 7. Voltage follower pulse response
4
3
R L 2 k Ω
V C C = +15V
2
3
2
1
0
1
0 10 20
T IME (
μ s)
30 40
DocID026928 Rev 1
RT2902
Figure 8. Common mode rejection ratio
120
100
80
60
40
20
0
100 e I
+7.5V
100k
Ω
100
Ω
-
100
Ω
+
100k
Ω
+7.5V
e O
1K 10K
F R E QUE NC Y (Hz)
100K 1M
Figure 10. Open-loop frequency response
140
120
100
80
60
V I
10M
Ω
0.1
μ
F
V C C
V O
V C C /2
+
V C C = 30V &
-55°C T amb +125°C
40
20
V C C = +10 to + 15V &
-55°C T amb +125°C
0
1.0
10 100 1k 10k 100k 1M 10M
F R E QUE NC Y (Hz)
Figure 12. Large signal frequency response
20
15 V I
1k
Ω
+7V
-
100k
Ω
+15V
V O
+ 2k
Ω
10
Electrical characteristics
Figure 9. Output characteristics (sink)
Figure 11. Voltage follower pulse response
500
+
450 el eO
50pF
400
Input
350
Output
300
250
0 1 2 3 4
T IME (
μ s )
5
T amb = +25°C
V C C = 30 V
6 7 8
Figure 13. Output characteristics (source)
5
0
1k 10k 100k
F R E QUE NC Y (Hz)
1M
DocID026928 Rev 1 9/16
16
Electrical characteristics
Figure 14. Input current Figure 15. Voltage gain
160
R = 20k
Ω
120
80
R = 2k
Ω
40
RT2902
Figure 16. Power supply and common mode rejection ratio
0 10 20 30
POSITIVE SUPPLY VOLTAGE (V)
Figure 17. Large signal voltage gain
10/16 DocID026928 Rev 1
RT2902
4
Typical single-supply applications
Typical single-supply applications
Figure 18. AC coupled inverting amplifier
R f
100 k Ω
C
I
R1
10 k Ω e
I ~
V
CC
R2
100 k Ω
1/4
RT2902
R
B
6.2 k Ω
R3
100 k Ω
R f
A
V
= -
R1
(a s s hown A
V
= -10)
C o e o
0
R
L
10 k Ω
2V
PP
C1
10
μ
F
Figure 19. AC coupled non-inverting amplifier
R1
100 k Ω
R2
1 M Ω
C1
0. 1 μ F
C
I
1/4
RT2902
R
B
6.2 k Ω
A
V
= 1 + R2
R1
(a s s hown A
V
= 11)
C o e o
0
R
L
10 k Ω
2 V
PP e
I ~
R3
1 M Ω
C2
10
μ
F
R4
100 k Ω
R5
100 k
Ω
V
CC
Figure 20. Non-inverting DC gain
10 k Ω
1/4
RT2902 e
O
A
V
= 1 +
R2
R1
(A s s hown A
V
= 101 )
+5 V
Figure 21. DC summing amplifier e
1
100 k
Ω
R1
10 k
Ω
R2
1 M Ω
0 e
I
(mV )
100 k
Ω 1/4
RT2902 e
2
100 k
Ω e
3
100 k
Ω
100 k
Ω e
4
100 k
Ω eo = e1 + e2 - e3 - e4 where (e1 + e2)
≥
(e3 + e4) to keep eo
≥
0 V e
O
Figure 22. Active bandpass filter
R1
100 k
Ω e
1
R3
10 k
Ω
1/4
RT2902
R4
10 M
Ω
C2
330 pF
R6
470 k
Ω
1/4
RT2902
R8
100 k
Ω
Fo = 1 kHz
Q = 50
Av = 100 (40 dB)
C1
330 pF
1/4
RT2902
C3
10
μ
F
R5
470 k
Ω e
O
R7
100 k
Ω
V
CC
Figure 23. High input Z adjustable gain DC instrumentation amplifier
R1
100 k
Ω
1/4
RT2902
R3
100 k Ω
R4
100 k Ω e
1
1/4
RT2902 e
O
R2
2 k
Ω
Ga in adjust
R5
100 k
Ω
R6
100 k
Ω
R7
100 k
Ω
1/4
RT2902 e
2
If R1 = R5 and R3 = R4 = R6 = R7
R2
As sho wn eo = 101 (e2 - e1)
DocID026928 Rev 1 11/16
16
Typical single-supply applications RT2902
Figure 24. High input Z, DC differential amplifier
R2
100 k Ω
R1
100 k Ω
+V 1
+V 2 eo = [ 1 + ] (e2 - e1)
R3
As sho wn eo = (e2 - e1)
1/4
RT2902
R3
100 k
Ω
R4
100 k
Ω
1/4
RT2902
Figure 25. Low drift peak detector
V o
I
B e
I
1/4
RT2902
1 μ F
C
*
I
B
1/4
RT2902
2I
B
Z o e o
Z
I
2I
B
R
1 M
Ω
2N 92 9
I
B
0.001 μ F
3R
3 M Ω
I
B
1/4
RT2902
Input current compensatio n
* P olycarbonat e or polyethylen e
Figure 26. Using symmetrical amplifiers to reduce input current (general concept) e
I
I
B
I
I
I
B
1/4
RT2902
2N 92 9
I
B
1.5 M
Ω e o
0.001 μ F
I
B
3 M
I
B
Ω
1/4
RT2902
Aux. amplifie r for input current compensatio n
12/16 DocID026928 Rev 1
RT2902 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK ® packages, depending on their level of environmental compliance. ECOPACK ® specifications, grade definitions and product status are available at: www.st.com
.
ECOPACK ® is an ST trademark.
DocID026928 Rev 1 13/16
16
Package information
5.1 SO14 package information
Figure 27. SO14 package mechanical drawing
RT2902
14/16
Ref.
E e
H h
L k ddd
B
C
D
A
A1
A2
Min.
1.35
0.10
1.10
0.33
0.19
8.55
3.80
5.80
0.25
0.40
Table 4. SO14 package mechanical data
Dimensions
Millimeters Inches
Typ.
Max.
1.75
0.25
1.65
0.51
0.25
8.75
4.0
Min.
0.05
0.004
0.04
0.01
0.007
0.33
0.15
Typ.
1.27
0.05
6.20
0.50
1.27
8° (max.)
0.22
0.009
0.015
0.10
Max.
0.068
0.009
0.06
0.02
0.009
0.34
0.15
0.24
0.02
0.05
0.004
DocID026928 Rev 1
RT2902 Ordering information
Order code
RT2902YDT
Table 5. Order codes
Temperature range Package
-40 °C to 125 °C SO14
Packing
Tape and reel
Marking
R2902Y
Table 6.
Date
Document revision history
Revision
08-Oct-2014 1 Initial release
Changes
DocID026928 Rev 1 15/16
16
RT2902
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16/16 DocID026928 Rev 1
