ON MC33179D High output current low power, low noise operational amplifier Datasheet

Order this document by MC33178/D
The MC33178/9 series is a family of high quality monolithic amplifiers
employing Bipolar technology with innovative high performance concepts for
quality audio and data signal processing applications. This device family
incorporates the use of high frequency PNP input transistors to produce
amplifiers exhibiting low input offset voltage, noise and distortion. In addition,
the amplifier provides high output current drive capability while consuming
only 420 µA of drain current per amplifier. The NPN output stage used,
exhibits no deadband crossover distortion, large output voltage swing,
excellent phase and gain margins, low open–loop high frequency output
impedance, symmetrical source and sink AC frequency performance.
The MC33178/9 family offers both dual and quad amplifier versions,
tested over the vehicular temperature range, and are available in DIP and
SOIC packages.
• 600 Ω Output Drive Capability
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HIGH OUTPUT CURRENT
LOW POWER, LOW NOISE
OPERATIONAL AMPLIFIERS
DUAL
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
Large Output Voltage Swing
8
Low Offset Voltage: 0.15 mV (Mean)
1
Low T.C. of Input Offset Voltage: 2.0 µV/°C
Low Total Harmonic Distortion: 0.0024% (@ 1.0 kHz w/600 Ω Load)
PIN CONNECTIONS
High Gain Bandwidth: 5.0 MHz
Output 1
High Slew Rate: 2.0 V/µs
Dual Supply Operation: ±2.0 V to ±18 V
Inputs 1
ESD Clamps on the Inputs Increase Ruggedness
without Affecting Device Performance
VEE
1
8
2
7
–
+
3
6
–
+ 5
4
VCC
Output 2
Inputs 2
(Top View)
Representative Schematic Diagram (Each Amplifier)
VCC
QUAD
P SUFFIX
PLASTIC PACKAGE
CASE 646
Iref
Iref
14
1
Vin +
Vin –
CC
VO
CM
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
14
1
PIN CONNECTIONS
Output 1
VEE
ORDERING INFORMATION
1
14
2
13
Inputs 1
3
Op Amp
Function
Dual
Quad
Fully
Compensated
Operating
Temperature Range
MC33178D
MC33178P
MC33179D
MC33179P
Package
SO–8
Plastic DIP
TA = –40° to +85°C
SO–14
Plastic DIP
VCC
1
4
–
+
+
Inputs 4
12
4
11
5
10
Inputs 2
6
Output 2
–
+
–
2
7
3
+
–
Output 4
VEE
Inputs 3
9
8
Output 3
(Top View)
 Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
Rev 0
1
MC33178 MC33179
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
VS
+36
V
VIDR
(Note 1)
V
Input Voltage Range
VIR
(Note 1)
V
Output Short Circuit Duration (Note 2)
tSC
Indefinite
sec
Maximum Junction Temperature
TJ
+150
°C
Storage Temperature Range
Tstg
–60 to +150
°C
Maximum Power Dissipation
PD
(Note 2)
mW
Supply Voltage (VCC to VEE)
Input Differential Voltage Range
NOTES: 1. Either or both input voltages should not exceed VCC or VEE.
2. Power dissipation must be considered to ensure maximum junction temperature (TJ) is not
exceeded. (See power dissipation performance characteristic, Figure 1.)
DC ELECTRICAL CHARACTERISTICS (VCC = +15 V, VEE = –15 V, TA = 25°C, unless otherwise noted.)
Characteristics
Figure
Symbol
Input Offset Voltage (RS = 50 Ω, VCM = 0 V, VO = 0 V)
(VCC = +2.5 V, VEE = –2.5 V to VCC = +15 V, VEE = –15 V)
TA = +25°C
TA = –40° to +85°C
2
|VIO|
Average Temperature Coefficient of Input Offset Voltage
(RS = 50 Ω, VCM = 0 V, VO = 0 V)
TA = –40° to +85°C
2
Input Bias Current (VCM = 0 V, VO = 0 V)
TA = +25°C
TA = –40° to +85°C
3, 4
Large Signal Voltage Gain (VO = –10 V to +10 V, RL = 600 Ω)
TA = +25°C
TA = –40° to +85°C
Output Voltage Swing (VID = ±1.0 V)
(VCC = +15 V, VEE = –15 V)
RL = 300 Ω
RL = 300 Ω
RL = 600 Ω
RL = 600 Ω
RL = 2.0 kΩ
RL = 2.0 kΩ
(VCC = +2.5 V, VEE = –2.5 V)
RL = 600 Ω
RL = 600 Ω
Typ
Max
0.15
—
3.0
4.0
∆VIO/∆T
µV/°C
—
2.0
—
—
—
100
—
500
600
—
—
5.0
—
50
60
–13
—
–14
+14
—
+13
50 k
25 k
200 k
—
—
—
IIB
nA
|IIO|
5
VICR
6, 7
AVOL
Unit
mV
—
—
Input Offset Current (VCM = 0 V, VO = 0 V)
TA = +25°C
TA = –40° to +85°C
Common Mode Input Voltage Range
(∆VIO = 5.0 mV, VO = 0 V)
Min
nA
V
V/V
8, 9, 10
V
VO+
VO–
VO+
VO–
VO+
VO–
—
—
+12
—
+13
—
+12
–12
+13.6
–13
+14
–13.8
—
—
—
–12
—
–13
VO+
VO–
1.1
—
1.6
–1.6
—
–1.1
Common Mode Rejection (Vin = ±13 V)
11
CMR
80
110
—
dB
Power Supply Rejection
VCC/VEE = +15 V/ –15 V, +5.0 V/ –15 V, +15 V/ –5.0 V
12
PSR
80
110
—
dB
Output Short Circuit Current (VID = ±1.0 V, Output to Ground)
Source (VCC = 2.5 V to 15 V)
Sink (VEE = –2.5 V to –15 V)
13, 14
ISC
+50
–50
+80
–100
—
—
Power Supply Current (VO = 0 V)
(VCC = 2.5 V, VEE = –2.5 V to VCC = +15 V, VEE = –15 V)
MC33178 (Dual)
TA = +25°C
TA = –40° to +85°C
MC33179 (Quad)
TA = +25°C
TA = –40° to +85°C
15
2
mA
ID
mA
—
—
—
—
1.4
1.6
—
—
1.7
—
2.4
2.6
MOTOROLA ANALOG IC DEVICE DATA
MC33178 MC33179
AC ELECTRICAL CHARACTERISTICS (VCC = +15 V, VEE = –15 V, TA = 25°C, unless otherwise noted.)
Characteristics
Slew Rate
(Vin = –10 V to +10 V, RL = 2.0 kΩ, CL = 100 pF, AV = +1.0 V)
Gain Bandwidth Product (f = 100 kHz)
AC Voltage Gain (RL = 600 Ω, VO = 0 V, f = 20 kHz)
Figure
Symbol
Min
Typ
Max
Unit
16, 31
SR
1.2
2.0
—
V/µs
17
GBW
2.5
5.0
—
MHz
18, 19
AVO
—
50
—
dB
fU
—
3.0
—
MHz
Unity Gain Frequency (Open–Loop) (RL = 600 Ω, CL = 0 pF)
Gain Margin (RL = 600 Ω, CL = 0 pF)
20, 22, 23
Am
—
15
—
dB
Phase Margin (RL = 600 Ω, CL = 0 pF)
21, 22, 23
φm
—
60
—
Degree
s
CS
—
–120
—
dB
BWp
—
32
—
kHz
—
—
—
0.0024
0.014
0.024
—
—
—
|ZO|
—
150
—
Ω
Differential Input Resistance (VCM = 0 V)
Rin
—
200
—
kΩ
Differential Input Capacitance (VCM = 0 V)
Cin
—
10
—
pF
—
—
8.0
7.5
—
—
—
—
0.33
0.15
—
—
Channel Separation (f = 100 Hz to 20 kHz)
24
Power Bandwidth (VO = 20 Vpp, RL = 600 Ω, THD ≤ 1.0%)
Distortion (RL = 600 Ω,, VO = 2.0 Vpp, AV = +1.0 V)
(f = 1.0 kHz)
(f = 10 kHz)
(f = 20 kHz)
25
Open Loop Output Impedance
(VO = 0 V, f = 3.0 MHz, AV = 10 V)
26
27
Equivalent Input Noise Current
f = 10 Hz
f = 1.0 kHz
28
Figure 1. Maximum Power Dissipation
versus Temperature
2400
2000
%
nV/ √ Hz
en
pA/ √ Hz
in
Figure 2. Input Offset Voltage versus
Temperature for 3 Typical Units
4.0
V IO , INPUT OFFSET VOLTAGE (mV)
PD (MAX), MAXIMUM POWER DISSIPATION (mW)
Equivalent Input Noise Voltage (RS = 100 Ω,)
f = 10 Hz
f = 1.0 kHz
THD
MC33178P/9P
1600
MC33179D
1200
800 MC33178D
400
0
–60 –40 –20
0
20
40
60
80 100 120 140 160 180
TA, AMBIENT TEMPERATURE (°C)
MOTOROLA ANALOG IC DEVICE DATA
VCC = +15 V
VEE = –15 V
RS = 10 Ω
VCM = 0 V
3.0
2.0
Unit 1
1.0
Unit 2
0
Unit 3
–1.0
–2.0
–3.0
–4.0
–55
–25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
3
MC33178 MC33179
Figure 3. Input Bias Current
versus Common Mode Voltage
Figure 4. Input Bias Current
versus Temperature
120
140
I IB , INPUT BIAS CURRENT (nA)
I IB , INPUT BIAS CURRENT (nA)
160
120
100
80
60
40
VCC = +15 V
VEE = –15 V
TA = 25°C
20
–10
–5.0
0
5.0
VCM, COMMON MODE VOLTAGE (V)
10
100
90
80
70
60
–55
15
Figure 5. Input Common Mode Voltage
Range versus Temperature
VCC
VCC –0.5 V
VCC = +5.0 V to +18 V
VEE = –5.0 V to –18 V
∆VIO = 5.0 mV
VCC –1.0 V
VCC –1.5 V
VCC –2.0 V
VEE +1.0 V
VEE +0.5 V
VEE
–55
–25
0
25
50
75
100
125
150
VCC = +15 V
VEE = –15 V
f = 10 Hz
∆VO = 10 V to +10 V
RL = 600 Ω
100
50
0
–55
140
180
1A
200
1B
220
240
260
20
280
VO, OUTPUT VOLTAGE (Vpp )
35
120
, EXCESS PHASE (DEGREES)
40
100
0
1A) Phase (RL = 600 Ω)
2B
–30 2A) Phase (RL = 600 Ω, CL = 300 pF)
2A
–40 1B) Gain (RL = 600 Ω)
2B) Gain (RL = 600 Ω, CL = 300 pF)
–50
2
3 4
5
6 7 8 9 10
f, FREQUENCY (Hz)
4
80
φ
A VOL, OPEN LOOP VOLTAGE GAIN (dB)
VCC = +15 V
VEE = –15 V
VO = 0 V
TA = 25°C
160
–20
–25
0
25
50
75
100
125
Figure 8. Output Voltage Swing
versus Supply Voltage
10
–10
125
TA, AMBIENT TEMPERATURE (°C)
50
20
100
200
Figure 7. Voltage Gain and Phase
versus Frequency
30
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
250
TA, AMBIENT TEMPERATURE (°C)
40
–25
Figure 6. Open Loop Voltage Gain
versus Temperature
AVOL, OPEN LOOP VOLTAGE GAIN (kV/V)
V ICR, INPUT COMMON MODE VOLTAGE RANGE (V)
0
–15
VCC = +15 V
VEE = –15 V
VCM = 0 V
110
TA = 25°C
30
RL = 10 kΩ
25
RL = 600 Ω
20
15
10
5.0
0
0
5.0
10
15
VCC, |VEE|, SUPPLY VOLTAGE (V)
20
MOTOROLA ANALOG IC DEVICE DATA
MC33178 MC33179
Figure 9. Output Saturation Voltage
versus Load Current
VCC –1.0 V
28
Source
TA = +125°C
VO, OUTPUT VOLTAGE (Vpp )
V sat , OUTPUT SATURATION VOLTAGE (V)
VCC
Figure 10. Output Voltage
versus Frequency
TA = –55°C
VCC –2.0 V
VEE +2.0 V
Sink
TA = –55°C
VEE +1.0 V
VCC = +5.0 V to +18 V
VEE = –5.0 V to –18 V
TA = +125°C
VEE
0
5.0
10
15
24
20
16
VCC = +15 V
VEE = –15 V
RL = 600 Ω
AV = +1.0 V
THD = ≤1.0%
TA = 25°C
12
8.0
4.0
0
1.0 k
20
10 k
Figure 11. Common Mode Rejection
versus Frequency Over Temperature
PSR, POWER SUPPLY REJECTION (dB)
VCC = +15 V
VEE = –15 V
VCM = 0 V
∆VCM = ±1.5 V
TA = –55° to +125°C
80
60
–
ADM
+
∆VCM
20
CMR = 20 Log
100
∆VO
∆VCM
∆VO
x ADM
1.0 k
10 k
f, FREQUENCY (Hz)
100 k
1.0 M
Figure 13. Output Short Circuit Current
versus Output Voltage
100
Source
80
Sink
60
40
VCC = +15 V
VEE = –15 V
VID = ±1.0 V
20
0
–15
–9.0
–3.0
0
3.0
VO, OUTPUT VOLTAGE (V)
MOTOROLA ANALOG IC DEVICE DATA
9.0
15
TA = –55° to +125°C
VCC = +15 V
VEE = –15 V
∆VCC = ±1.5 V
+PSR
100
80
–PSR
–
ADM
+
60
40
VCC
∆VO
VEE
20
PSR = 20 Log
0
10
I SC , OUTPUT SHORT CIRCUIT CURRENT (mA)
CMR, COMMON MODE REJECTION (dB)
I SC , OUTPUT SHORT CIRCUIT CURRENT (mA)
120
100
0
10
1.0 M
Figure 12. Power Supply Rejection
versus Frequency Over Temperature
120
40
100 k
f, FREQUENCY (Hz)
IL, LOAD CURRENT (±mA)
∆VO/ADM
∆VCC
100
1.0 k
10 k
f, FREQUENCY (Hz)
100 k
1.0 M
Figure 14. Output Short Circuit Current
versus Temperature
100
90
VCC = +15 V
VEE = –15 V
VID = ±1.0 V
RL < 10 Ω
Sink
80
Source
70
60
50
–55
–25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
5
MC33178 MC33179
Figure 16. Normalized Slew Rate
versus Temperature
1.15
625
TA = +25°C
250
TA = –55°C
125
0
0
2.0
4.0
6.0
8.0
10
12
14
16
1.05
1.00
0.95
0.90
–
0.85
∆Vin
0.75
–55
18
–25
0
VCC = +15 V
VEE = –15 V
f = 100 kHz
RL = 600 Ω
CL = 0 pF
–25
100
125
30
140
10
180
0
VCC = +15 V
VEE = –15 V
RL = 600 Ω
TA = 25°C
CL = 0 pF
–10
–20
–30
–50
100 k
–10
1A
1B
2A
–20 1A) Phase V =18 V, V = –18 V
CC
EE
–30 2A) Phase VCC 1.5 V, VEE = –1.5 V
1B) Gain V = 18 V, V = –18 V
–40 2B) Gain VCC = 1.5 V, VEE = –1.5 V
CC
EE
–50
100 k
1.0 M
140
160
200
220
240
260
10 M
f, FREQUENCY (Hz)
6
120
180
2B
200
220
240
260
280
100 M
1.0 M
10 M
f, FREQUENCY (Hz)
15
100
280
100 M
Am, OPEN LOOP GAIN MARGIN (dB)
20
160
Gain
Figure 20. Open Loop Gain Margin
versus Temperature
φ , PHASE (DEGREES)
30
120
20
80
TA = 25°C
RL = ∞
CL = 0 pF
40
100
Phase
–40
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
125
80
50
50
0
100
Figure 18. Voltage Gain and Phase
versus Frequency
6.0
10
75
Figure 17. Gain Bandwidth Product
versus Temperature
8.0
0
–55
50
600 Ω
TA, AMBIENT TEMPERATURE (°C)
40
2.0
25
VO
100 pF
VCC, |VEE| , SUPPLY VOLTAGE (V)
10
4.0
+
0.80
Figure 19. Voltage Gain and Phase
versus Frequency
A V , VOLTAGE GAIN (dB)
VCC = +15 V
VEE = –15 V
∆Vin = 20 Vpp
φ , EXCESS PHASE (DEGREES)
375
1.10
SR, SLEW RATE (NORMALIZED)
TA = +125°C
500
A V , VOLTAGE GAIN (dB)
GBW, GAIN BANDWIDTH PRODUCT (MHz)
I CC, SUPPLY CURRENT/AMPLIFIER (µ A)
Figure 15. Supply Current versus Supply
Voltage with No Load
CL = 10 pF
12
CL = 100 pF
9.0
CL = 300 pF
6.0
3.0
0
–55
VCC = +15 V
VEE = –15 V
RL = 600 Ω
–25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
MOTOROLA ANALOG IC DEVICE DATA
MC33178 MC33179
Figure 21. Phase Margin
versus Temperature
Figure 22. Phase Margin and Gain Margin
versus Differential Source Resistance
12
10
CL = 100 pF
40
30
CL = 300 pF
20
VCC = +15 V
VEE = –15 V
RL = 600 Ω
10
0
–55
–25
8.0
6.0
25
50
75
100
50
VCC = +15 V
VEE = –15 V
RT = R1+R2
VO = 0 V
TA = 25°C
1.0 k
40
30
–
6.0
Vin
3.0
+
20
VO
600 Ω
CL
10
0
1.0 k
0
10
100
Drive Channel
VCC = +15 V
CEE = –15 V
RL = 600 Ω
TA = 25°C
140
130
120
110
100
100
1.0 k
CL, OUTPUT LOAD CAPACITANCE (pF)
100 k
1.0 M
Figure 26. Output Impedance
versus Frequency
10
500
VCC = +15 V VO = 2.0 Vpp
VEE = –15 V TA = 25°C
RL = 600 Ω
|Z O |, OUTPUT IMPEDANCE ( Ω )
THD, TOTAL HARMONIC DISTORTION (%)
10 k
f, FREQUENCY (Hz)
Figure 25. Total Harmonic Distortion
versus Frequency
AV = 1000
1.0
AV = 100
0.1
0.01
10
0
100 k
10 k
150
CS, CHANNEL SEPARATION (dB)
50
Gain Margin
9.0
10
Figure 24. Channel Separation
versus Frequency
m, PHASE MARGIN (DEGREES)
12
VO
RT, DIFFERENTIAL SOURCE RESISTANCE (Ω)
φ
A m , OPEN LOOP GAIN MARGIN (dB)
VCC = +15 V
VEE = –15 V
VO = 0 V
Phase Margin
+
R2
0
100
125
60
15
30
–
Vin
Figure 23. Open Loop Gain Margin and Phase
Margin versus Output Load Capacitance
Phase Margin
40
20
R1
TA, AMBIENT TEMPERATURE (°C)
18
Gain Margin
4.0
2.0
0
60
φ m , PHASE MARGIN (DEGREES)
CL = 10 pF
50
A m , GAIN MARGIN (dB)
φ m , PHASE MARGIN (DEGREES)
60
AV = 10
AV = 1.0
400
300
VCC = +15 V
VEE = –15 V
VO = 0 V
TA = 25°C
1. AV = 1.0
2. AV = 10
3. AV = 100
4. AV = 1000
200
100
3
2
1
4
100
1.0 k
10 k
f, FREQUENCY (Hz)
MOTOROLA ANALOG IC DEVICE DATA
100 k
0
1.0 k
10 k
100 k
f, FREQUENCY (Hz)
1.0 M
10 M
7
e n , INPUT REFERRED NOISE VOLTAGE ( nV/ √ Hz )
Figure 27. Input Referred Noise Voltage
versus Frequency
20
Input Noise Voltage Test Circuit
18
+
16
VO
–
14
12
10
8.0
6.0
4.0
2.0
0
10
VCC = +15 V
VEE = –15 V
TA = 25°C
100
1.0 k
f, FREQUENCY (Hz)
10 k
10 k
i n , INPUT REFERRED NOISE CURRENT (pA/ √ Hz )
MC33178 MC33179
Figure 28. Input Referred Noise Current
versus Frequency
0.5
Input Noise Current Test Circuit
0.4
RS
+
–
VO
0.3
(RS = 10 kΩ)
0.2
0.1
VCC = +15 V
VEE = –15 V
TA = 25°C
0
10
Figure 29. Percent Overshoot versus
Load Capacitance
100
1.0 k
f, FREQUENCY (Hz)
10 k
100 k
Figure 30. Noninverting Amplifier Slew Rate
90
PERCENT OVERSHOOT (%)
80
70
VCC = +15 V
VEE = –15 V
TA = 25°C
60
RL = 600 Ω
50
RL = 2.0 kΩ
40
30
20
10
0
10
100
1.0 k
V O, OUTPUT VOLTAGE (5.0 V/DIV)
100
10 k
VCC = +15 V
VEE = –15 V
AV = +1.0
RL = 600 Ω
CL = 100 pF
TA = 25°C
t, TIME (2.0 µs/DIV)
CL, LOAD CAPACITANCE (pF)
V O, OUTPUT VOLTAGE (50 mV/DIV)
VCC = +15 V
VEE = –15 V
AV = +1.0
RL = 600 Ω
CL = 100 pF
TA = 25°C
t, TIME (2.0 ns/DIV)
8
Figure 32. Large Signal Transient Response
VCC = +15 V
VEE = –15 V
AV = +1.0
RL = 600 Ω
CL = 100 pF
TA = 25°C
V O, OUTPUT VOLTAGE (5.0 V/DIV)
Figure 31. Small Signal Transient Response
t, TIME (5.0 µs/DIV)
MOTOROLA ANALOG IC DEVICE DATA
MC33178 MC33179
Figure 33. Telephone Line Interface Circuit
10 k
A1
To
Receiver
–
10 k
+
10 k
1.0 µF
200 k
120 k
From
Microphone
2.0 k
–
+
0.05 µF
300
A2
820
Tip
VR
1N4678
Phone Line
10 k
Ring
10 k
–
+
A3
VR
APPLICATION INFORMATION
This unique device uses a boosted output stage to
combine a high output current with a drain current lower than
similar bipolar input op amps. Its 60° phase margin and 15 dB
gain margin ensure stability with up to 1000 pF of load
capacitance (see Figure 23). The ability to drive a minimum
600 Ω load makes it particularly suitable for telecom
applications. Note that in the sample circuit in Figure 33 both
A2 and A3 are driving equivalent loads of approximately
600 Ω .
The low input offset voltage and moderately high slew rate
and gain bandwidth product make it attractive for a variety of
other applications. For example, although it is not single
supply (the common mode input range does not include
ground), it is specified at +5.0 V with a typical common mode
rejection of 110 dB. This makes it an excellent choice for use
with digital circuits. The high common mode rejection, which
is stable over temperature, coupled with a low noise figure
and low distortion, is an ideal op amp for audio circuits.
The output stage of the op amp is current limited and
therefore has a certain amount of protection in the event of a
short circuit. However, because of its high current output, it is
especially important not to allow the device to exceed the
maximum junction temperature, particularly with the
MC33179 (quad op amp). Shorting more than one amplifier
MOTOROLA ANALOG IC DEVICE DATA
could easily exceed the junction temperature to the extent of
causing permanent damage.
Stability
As usual with most high frequency amplifiers, proper lead
dress, component placement, and PC board layout should be
exercised for optimum frequency performance. For example,
long unshielded input or output leads may result in unwanted
input/output coupling. In order to preserve the relatively
low input capacitance associated with these amplifiers,
resistors connected to the inputs should be immediately
adjacent to the input pin to minimize additional stray input
capacitance. This not only minimizes the input pole
frequency for optimum frequency response, but also
minimizes extraneous “pick up” at this node. Supplying
decoupling with adequate capacitance immediately adjacent
to the supply pin is also important, particularly over
temperature, since many types of decoupling capacitors
exhibit great impedance changes over temperature.
Additional stability problems can be caused by high load
capacitances and/or a high source resistance. Simple
compensation schemes can be used to alleviate these
effects.
9
MC33178 MC33179
For moderately high capacitive loads (500 pF < CL
< 1500 pF) the addition of a compensation resistor on the
order of 20 Ω between the output and the feedback loop will
help to decrease miller loop oscillation (see Figure 35). For
high capacitive loads (C L > 1500 pF), a combined
compensation scheme should be used (see Figure 36). Both
the compensation resistor and the compensation capacitor
affect the transient response and can be calculated for
optimum performance. The value of CC can be calculated
using Equation (1). The Equation to calculate RC is as
follows:
If a high source of resistance is used (R1 > 1.0 kΩ), a
compensation capacitor equal to or greater than the input
capacitance of the op amp (10 pF) placed across the
feedback resistor (see Figure 34) can be used to neutralize
that pole and prevent outer loop oscillation. Since the closed
loop transient response will be a function of that capacitance,
it is important to choose the optimum value for that capacitor.
This can be determined by the following Equation:
CC = (1 +[R1/R2])2
CL (ZO/R2)
(1)
where: ZO is the output impedance of the op amp.
RC = ZO
Figure 34. Compensation for
High Source Impedance
R1/R2
(2)
Figure 35. Compensation Circuit for
Moderate Capacitive Loads
R2
R2
CC
–
RC
–
+
R1
+
CL
R1
ZL
Figure 36. Compensation Circuit for
High Capacitive Loads
R2
CC
–
R1
RC
+
CL
10
MOTOROLA ANALOG IC DEVICE DATA
MC33178 MC33179
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 626–05
ISSUE K
8
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
5
–B–
1
DIM
A
B
C
D
F
G
H
J
K
L
M
N
F
–A–
NOTE 2
MILLIMETERS
MIN
MAX
9.40
10.16
6.10
6.60
3.94
4.45
0.38
0.51
1.02
1.78
2.54 BSC
0.76
1.27
0.20
0.30
2.92
3.43
7.62 BSC
–––
10_
0.76
1.01
4
L
C
J
–T–
INCHES
MIN
MAX
0.370
0.400
0.240
0.260
0.155
0.175
0.015
0.020
0.040
0.070
0.100 BSC
0.030
0.050
0.008
0.012
0.115
0.135
0.300 BSC
–––
10_
0.030
0.040
N
SEATING
PLANE
D
M
K
G
H
0.13 (0.005)
M
T A
M
B
M
D SUFFIX
PLASTIC PACKAGE
CASE 751–05
(SO–8)
ISSUE R
D
A
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETERS.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
C
8
5
0.25
H
E
M
B
M
1
4
h
B
e
X 45 _
q
A
C
SEATING
PLANE
L
0.10
A1
B
0.25
M
C B
S
A
S
MOTOROLA ANALOG IC DEVICE DATA
DIM
A
A1
B
C
D
E
e
H
h
L
q
MILLIMETERS
MIN
MAX
1.35
1.75
0.10
0.25
0.35
0.49
0.18
0.25
4.80
5.00
3.80
4.00
1.27 BSC
5.80
6.20
0.25
0.50
0.40
1.25
0_
7_
11
MC33178 MC33179
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 646–06
ISSUE L
14
NOTES:
1. LEADS WITHIN 0.13 (0.005) RADIUS OF TRUE
POSITION AT SEATING PLANE AT MAXIMUM
MATERIAL CONDITION.
2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
3. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
4. ROUNDED CORNERS OPTIONAL.
8
B
1
7
A
F
DIM
A
B
C
D
F
G
H
J
K
L
M
N
L
C
J
N
H
G
D
SEATING
PLANE
K
M
D SUFFIX
PLASTIC PACKAGE
CASE 751A–03
(SO–14)
ISSUE F
8
–B–
1
P 7 PL
0.25 (0.010)
7
G
M
F
–T–
D 14 PL
0.25 (0.010)
M
K
M
T B
S
M
R X 45 _
C
SEATING
PLANE
B
A
S
MILLIMETERS
MIN
MAX
18.16
19.56
6.10
6.60
3.69
4.69
0.38
0.53
1.02
1.78
2.54 BSC
1.32
2.41
0.20
0.38
2.92
3.43
7.62 BSC
0_
10_
0.39
1.01
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
–A–
14
INCHES
MIN
MAX
0.715
0.770
0.240
0.260
0.145
0.185
0.015
0.021
0.040
0.070
0.100 BSC
0.052
0.095
0.008
0.015
0.115
0.135
0.300 BSC
0_
10_
0.015
0.039
J
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
8.55
8.75
3.80
4.00
1.35
1.75
0.35
0.49
0.40
1.25
1.27 BSC
0.19
0.25
0.10
0.25
0_
7_
5.80
6.20
0.25
0.50
INCHES
MIN
MAX
0.337
0.344
0.150
0.157
0.054
0.068
0.014
0.019
0.016
0.049
0.050 BSC
0.008
0.009
0.004
0.009
0_
7_
0.228
0.244
0.010
0.019
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
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and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
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Opportunity/Affirmative Action Employer.
How to reach us:
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12
◊
*MC33178/D*
MOTOROLA ANALOG IC DEVICE
DATA
MC33178/D
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