MAX475EPD [MAXIM]
Single/Dual/Quad, 10MHz Single-Supply Op Amps; 单/双/四路， 10MHz的单电源运算放大器
| 型号： | MAX475EPD |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Single/Dual/Quad, 10MHz Single-Supply Op Amps |
| 文件： | 总12页 (文件大小：146K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0260; Rev 1; 3/95
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
3/MAX475
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 15V/µs Min Slew Rate
The single MAX473, dual MAX474, and quad MAX475
are single-supply (2.7V to 5.25V), unity-gain-stable op
amps with rail-to-rail output swing. Each op amp guar-
antees a 10MHz unity-gain bandwidth, 15V/µs slew
rate, and 600Ω drive capability while typically consum-
ing only 2mA supply current. In addition, the input
range includes the negative supply rail and the output
swings to within 50mV of each supply rail.
♦ +3V Single-Supply Operation
♦ Guaranteed 10MHz Unity-Gain Bandwidth
♦ 2mA Supply Current per Amplifier
♦ Input Range Includes Negative Rail
♦ Outputs Short-Circuit Protected
Single-supply operation makes these devices ideal for
low-power and low-voltage portable applications. With
their fast slew rate and settling time, they can replace
higher-current op amps in large-signal applications.
The MAX473/MAX474/MAX475 are available in DIP and
SO p a c ka g e s in the ind us try-s ta nd a rd op -a mp p in
c onfig ura tions . The MAX473 a nd MAX474 a re a ls o
offered in the µMAX package, the smallest 8-pin SO.
♦ Rail-to-Rail Output Swing (to within ±50mV)
♦ µMAX Package (the smallest 8-pin SO)
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX473CPA
MAX473CSA
MAX473CUA
MAX473C/D
MAX473EPA
MAX473ESA
MAX473MJA
________________________Ap p lic a t io n s
Portable Equipment
0°C to +70°C
0°C to +70°C
8 µMAX
Battery-Powered Instruments
Signal Processing
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
Discrete Filters
8 CERDIP
Signal Conditioning
Ordering Information continued on last page.
* Dice are specified at T = +25°C, DC parameters only.
A
Servo-Loops
__________Typ ic a l Op e ra t in g Circ u it
_________________P in Co n fig u ra t io n s
9.9k
TOP VIEW
82pF
82pF
3V
9.9k
3V
1
2
3
4
8
7
6
5
NULL
NULL
IN-
MAX473
V
CC
IN+
OUT
N.C.
V
EE
3V
9.9k
9.9k
V
IN
9.9k
1/4 MAX475
DIP/SO/µMAX
100mVp-p
1/4 MAX475
1/4 MAX475
OUTA
INA-
1
2
3
4
8
7
6
5
V
CC
MAX474
1V
OUTB
INB-
1V
127k
A
INA+
B
BANDPASS OUTPUT
1Vp-p at 190kHz
9.9k
V
EE
INB+
f = 190kHz
o
Q = 10
1V
DIP/SO/µMAX
BANDPASS FILTER
Pin Configurations continued on last page.
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V - V )......................................................7V
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C)......727mW
Operating Temperature Ranges
CC
EE
Input Voltage (IN+, IN-, IN_+, IN_-).........................(V + 0.3V)
CC
EE
to (V - 0.3V)
Output Short-Circuit Duration.....................................Continuous
MAX47_C_ _ ......................................................0°C to +70°C
MAX47_E_ _.....................................................-40°C to +85°C
MAX47_MJ_...................................................-55°C to +125°C
Junction Temperatures
MAX47_C_ _/E_ _........................................................ +150°C
MAX47_MJ_ ................................................................ +175°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Continuous Power Dissipation (T = +70°C)
A
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C)........640mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)...800mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(+3V ≤ V ≤ +5V, V = 0V, V = 0.5V, V
= 0.5V, T = +25°C, unless otherwise noted.)
A
CC
EE
CM
OUT
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
±0.70
±0.70
±0.80
80
MAX
±2.0
±2.0
±2.5
150
UNITS
MAX473
MAX474
MAX475
Input Offset Voltage
V
OS
mV
Input Bias Current
Input Offset Current
I
B
Current flows out of terminals
0
nA
nA
3/MAX475
I
OS
±10
±30
High
Low
V
CC
- 1.9
V
- 1.7
CC
Common-Mode Voltage
V
CM
V
V
EE
- 0.1
V
EE
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Input Noise-Voltage Density
CMRR
PSRR
V
≤ V ≤ (V - 1.9V)
80
80
90
dB
dB
EE
CM
CC
V
CC
= 2.7V to 6.0V
90
40
nV/√Hz
e
f = 10kHz
n
R
R
R
= no load
= 10kΩ
= 600Ω
110
105
90
L
L
L
0.3V ≤ V
(V - 0.5V)
CC
≤
OUT
94
82
Large-Signal Gain
(Note 1)
A
VOL
V
CC
= 5V
= 3V
= 5V
= 3V
76
dB
Sinking 5mA
V
CC
100
76
V
CC
Sourcing 5mA
V
CC
90
V
V
+ - V - = +1V, R = no load
V
CC
- 0.05
OH
IN
IN
L
Output Voltage
Slew Rate
V
V
OL
V
IN
+ - V - = -1V, R = no load
V
EE
+ 0.05
IN
L
V
= 5V, R = 10kΩ, C = 20pF,
L L
+ - V - = +1V step
IN
CC
SR
15
10
17
V/µs
MHz
V
IN
3V ≤ V ≤ 5V
12
10
CC
Unity-Gain Bandwidth
(Note 2)
GBW
V
CC
= 2.7V
2
_______________________________________________________________________________________
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
3/MAX475
ELECTRICAL CHARACTERISTICS (continued)
(+3V ≤ V ≤ +5V, V = 0V, V = 0.5V, V = 0.5V, T = +25°C, unless otherwise noted.)
OUT A
CC
EE
CM
PARAMETER
Settling Time
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
t
S
To 0.1%, C = 20pF
400
ns
L
A
= +1, V = 1/2 V step, see Typical
IN CC
V
Power-Up Time
Overshoot
t
700
ns
%
PU
Operating Characteristics
C
C
= 150pF
= 20pF
10
5
L
L
V
= 5V
= 3V
= 5V
= 3V
63
58
10
12
2.0
CC
R
C
= 10kΩ,
= 20pF
L
L
Phase Margin
degrees
V
CC
V
CC
R
C
= 10kΩ,
= 20pF
L
L
Gain Margin
dB
mA
V
V
CC
Supply Current
I
S
Per amplifier
Single supply
Dual supplies
3.0
5.25
2.7
Operating Supply-Voltage
Range
±1.35
±2.625
ELECTRICAL CHARACTERISTICS
(+3V ≤ V ≤ +5V, V = 0V, V = 0.5V, V
= 0.5V, T = 0°C to +70°C, unless otherwise noted.)
A
CC
EE
CM
OUT
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
±2.0
±2.0
±3.0
175
UNITS
MAX473
MAX474
MAX475
Input Offset Voltage
V
OS
mV
Input Bias Current
Input Offset Current
I
B
Current flows out of terminals
0
nA
nA
dB
dB
I
OS
±35
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
V
EE
≤ V ≤ (V - 1.9V)
78
78
94
80
CM
CC
V
CC
= 2.7V to 6.0V
R
R
= 10kΩ
= 600Ω
L
L
Large-Signal Gain
(Note 1)
0.4V ≤ V
≤
OUT
A
VOL
dB
V
(V - 0.6V)
CC
V
OH
V
IN
+ - V - = +1V, R = no load
V
- 0.07
IN
L
CC
Output Voltage
V
OL
V + - V - = -1V, R = no load
IN IN L
V
EE
+ 0.07
V
V
IN
= 5V, R = 10kΩ, C = 20pF,
L L
+ - V - = +1V step
IN
CC
Slew Rate
SR
12
V/µs
mA
V
Supply Current
I
S
Per amplifier
Single supply
Dual supplies
3.3
5.25
2.7
Operating Supply-Voltage
Range
±1.35
±2.625
_______________________________________________________________________________________
3
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
ELECTRICAL CHARACTERISTICS
(+3V ≤ V ≤ +5V, V = 0V, V = 0.5V, V
= 0.5V, T = -40°C to +85°C, unless otherwise noted.)
A
CC
EE
CM
OUT
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
±2.3
±2.3
±3.3
200
UNITS
MAX473
MAX474
MAX475
Input Offset Voltage
V
OS
mV
Input Bias Current
Input Offset Current
I
B
Current flows out of terminals
0
nA
nA
dB
dB
I
OS
±50
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
V
EE
≤ V ≤ (V - 2.0V)
72
72
94
72
CM
CC
V
CC
= 2.7V to 6.0V
R
R
= 10kΩ
= 600Ω
L
L
Large-Signal Gain
(Note 1)
0.4V ≤ V
≤
OUT
A
VOL
dB
V
(V - 0.6V)
CC
V
OH
V
IN
+ - V - = +1V, R = no load
V
- 0.08
IN
L
CC
Output Voltage
V
OL
V + - V - = - 1V, R = no load
IN IN L
V
EE
+ 0.08
V
V
IN
= 5V, R = 10kΩ, C = 20pF,
L L
+ - V - = +1V step
IN
CC
Slew Rate
SR
10
V/µs
mA
V
Supply Current
I
S
Per amplifier
Single supply
Dual supplies
3.4
5.25
2.7
Operating Supply-Voltage
Range
±1.35
±2.625
3/MAX475
ELECTRICAL CHARACTERISTICS
(+3V ≤ V ≤ +5V, V = 0V, V = 0.5V, V
= 0.5V, T = -55°C to +125°C, unless otherwise noted.)
A
CC
EE
CM
OUT
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
±2.8
±2.8
±4.0
225
UNITS
MAX473
MAX474
MAX475
Input Offset Voltage
V
OS
mV
Input Bias Current
Input Offset Current
I
B
Current flows out of terminals
0
nA
nA
dB
dB
I
OS
±60
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
V
EE
≤ V ≤ (V - 2.15V)
70
70
90
70
CM
CC
V
CC
= 2.7V to 6.0V
R
R
= 10kΩ
= 600Ω
L
Large-Signal Gain
(Note 1)
0.5V ≤ V
≤
OUT
A
VOL
dB
V
(V - 0.6V)
CC
L
V
OH
V
IN
+ - V - = +1V, R = no load
V
- 0.1
IN
L
CC
Output Voltage
V
OL
V + - V - = -1V, R = no load
IN IN L
V
EE
+ 0.1
V
V
IN
= 5V, R = 10kΩ, C = 20pF,
L L
+ - V - = +1V step
IN
CC
Slew Rate
SR
9
V/µs
mA
Supply Current
I
S
Per amplifier
Single supply
Dual supplies
3.6
5.25
2.7
Operating Supply-Voltage
Range
V
±1.35
±2.625
Note 1: Gain decreases to zero as the output swings beyond the specified limits.
Note 2: Guaranteed by correlation to slew rate.
4
_______________________________________________________________________________________
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
3/MAX475
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = 5V, V = 0V, T = +25°C, unless otherwise noted.)
CC
EE
A
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
INPUT BIAS CURRENT
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
3.0
120
3.0
2.5
2.0
1.5
1.0
100
80
V
= 5V
= 3V
CC
2.5
2.0
1.5
1.0
60
V
CC
40
0.5
0
20
0
2
3
4
5
6
-60
-20
20
60
100
140
-60
-20
20
60
100
140
V
-V (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
CC EE
GAIN-BANDWIDTH PRODUCT
vs. TEMPERATURE
MAXIMUM OUTPUT VOLTAGE
vs. LOAD RESISTANCE
SLEW RATE vs. TEMPERATURE
20
16
5.2
A
V
CC
= 5V
VCL = 40dB
V
= 5V
CC
5.1
5.0
4.9
4.8
17
14
15
14
V
CC
V
CC
= 3V
1V
11
8
13
12
R
L
4.7
-60
-20
20
60
100
140
0.1
1
10
100
1000
-60
-20
20
60
100
140
TEMPERATURE (°C)
LOAD RESISTANCE (kΩ)
TEMPERATURE (°C)
MAXIMUM OUTPUT VOLTAGE
vs. LOAD RESISTANCE
MINIMUM OUTPUT VOLTAGE
vs. LOAD RESISTANCE
3.1
0.5
V
CC
V
CC
= 3V
R
1V
L
0.4
0.3
0.2
0.1
3.0
2.9
2.8
V
CC
1V
V
CC
= 5V
V
= 3V
1
CC
R
L
2.7
0.1
0
1
10
100
1000
0.1
10
100
1000 10,000
LOAD RESISTANCE (kΩ)
LOAD RESISTANCE (kΩ)
_______________________________________________________________________________________
5
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = 5V, V = 0V, T = +25°C, unless otherwise noted.)
CC
EE
A
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
MAXIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
OPEN-LOOP VOLTAGE GAIN
vs. LOAD RESISTANCE
20
125
115
105
95
50
40
30
20
1V
V
CC
V
= 3V
= 5V
CC
15
10
V
CC
V
= 5V
= 3V
CC
V
CC
= 5V
= 3V
1V
V
CC
V
CC
5
0
V
CC
10
0
85
-60
-20
20
60
100
140
-60
-20
20
60
100
140
0.1
1
10
100
1000 10,000
TEMPERATURE (°C)
TEMPERATURE (°C)
LOAD RESISTANCE (kΩ)
VOLTAGE-NOISE DENSITY
vs. FREQUENCY
OVERSHOOT vs. CAPACITIVE LOAD
= NO LOAD
OPEN-LOOP GAIN vs. TEMPERATURE
130
1000
40
30
INPUT REFERRED
R
L
R
= 10kΩ
L
4
110
90
R
L
= 600Ω
100
70
20
10
0
V
= 3V
CC
0.5V STEP
50
V
= 5V
CC
1.0V STEP
30
10
10
10
100
1k
10k
100k
1
10
100
1000
-60
-20
20
60
100
140
FREQUENCY (Hz)
CAPACITIVE LOAD (pF)
TEMPERATURE (°C)
TOTAL HARMONIC DISTORTION
AND NOISE vs. FREQUENCY
CURRENT-NOISE DENSITY
vs. FREQUENCY
-60
-65
100
INPUT REFERRED
A = +1
V
V
= 1.5Vp-p
IN
-70
-75
-80
-85
-90
10
10
100
1k
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
6
_______________________________________________________________________________________
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
3/MAX475
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = 5V, V = 0V, T = +25°C, unless otherwise noted.)
CC
EE
A
UNITY-GAIN FOLLOWER
FREQUENCY RESPONSE
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
UNITY-GAIN FOLLOWER
FREQUENCY RESPONSE
180
144
108
72
80
1
0
180
144
108
72
V
R
= 5V
= 10kΩ 20pF
CC
V
R
L
= 3V
CC
= 10kΩ 20pF
1
0
L
II
II
70
GAIN
60
50
40
30
GAIN
-1
-2
36
36
V
= 3V ± 300mV
CC
0
-1
-2
0
PHASE
PHASE
-36
-72
-108
-144
-180
-36
-72
-108
-144
-180
-3
-4
V
= 5V ± 250mV
CC
-3
20
1k
10k
100k
1M
10M
1
10
100
1000
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (kHz)
FREQUENCY (Hz)
GAIN AND PHASE vs. FREQUENCY
= 3V
GAIN AND PHASE vs. FREQUENCY
V = 5V
CC
180
144
108
72
180
144
108
72
V
CC
40
40
GAIN
GAIN
20
0
20
0
36
36
PHASE
PHASE
0
0
-36
-72
-108
-144
-180
-36
-72
-108
-144
-180
-20
-40
-20
-40
10k
10k
10k
20pF
10k
20pF
100
100
1k
10k
100k
1M
10M
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
0.1Hz to 10Hz VOLTAGE NOISE
POWER-UP TIME
A
B
1k
1k
100k
10pF
500ns/div
A : V , 5V/div
B : V , 1V/div
OUT
CC
1sec/div
_______________________________________________________________________________________
7
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = 5V, V = 0V, T = +25°C, unless otherwise noted.)
CC
EE
A
SMALL-SIGNAL TRANSIENT RESPONSE
SMALL-SIGNAL TRANSIENT RESPONSE
(V = 5V)
CC
(V = 3V)
CC
A
A
0.5V
0.5V
B
B
0.5V
0.5V
200ns/div
200ns/div
V
CC
= 5V, A = +1, R = 10kΩ, C = 220pF
V
CC
= 3V, A = +1, R = 10kΩ, C = 100pF
V
L
L
V
L
L
A : V , 50mV/div
IN
A : V , 50mV/div
IN
B : V , 50mV/div
OUT
B : V , 50mV/div
OUT
3/MAX475
LARGE-SIGNAL TRANSIENT RESPONSE
OVERDRIVING THE OUTPUT
A
A
1.5V
0.5V
B
B
0.5V
0V
200ns/div
200ns/div
V
CC
= 5V, A = +1, R = 10kΩ, C = 220pF
V
CC
= 5V, V - = 2.0V, R = 10kΩ, C = 33pF
V
L
L
IN
L
L
A : V , 1V/div
IN
A : V +, 1V/div
IN
B : V , 500mV/div
OUT
B : V , 1V/div
OUT
8
_______________________________________________________________________________________
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
3/MAX475
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION
MAX473
MAX474
MAX475
Offset Null Input. Connect to one end of 2kΩ potentiometer for offset voltage
trimming. Connect wiper to V . See Figure 1.
EE
1, 8
—
—
NULL
—
2
1
—
2
1
—
2
OUTA
IN-
Amplifier A Output
Inverting Input
—
3
INA-
IN+
Amplifier A Inverting Input
—
3
—
3
Noninverting Input
—
4
INA+
Amplifier A Noninverting Input
Negative Power-Supply Pin. Connect to ground or a negative voltage.
No Connect—not internally connected
Amplifier B Noninverting Input
Amplifier Output
4
11
—
5
V
EE
5
—
5
N.C.
INB+
OUT
INB-
—
6
—
6
—
6
—
—
7
Amplifier B Inverting Input
7
7
OUTB
Amplifier B Output
8
4
V
CC
Positive Power-Supply Pin. Connect to (+) terminal of power supply.
Amplifier C Output
—
—
—
—
—
—
—
—
—
—
—
—
8
OUTC
INC-
9
Amplifier C Inverting Input
10
12
13
14
INC+
IND+
IND-
Amplifier C Noninverting Input
Amplifier D Noninverting Input
Amplifier D Inverting Input
OUTD
Amplifier D Output
The MAX473/MAX474/MAX475 are bipolar op amps
__________Ap p lic a t io n s In fo rm a t io n
with low input bias currents. The bias currents at both
inputs flow out of the device. Matching the resistance
at the op amp’s inputs significantly reduces the offset
error caused by the bias currents. Place a resistor (R3)
from the noninverting input to ground when using the
inverting configuration (Figure 2a); place R3 in series
with the noninverting input when using the noninverting
configuration (Figure 2b). Select R3 such that the paral-
lel combination of R2 and R1 equals R3. Adding R3 will
slightly increase the op amp’s voltage noise.
P o w e r S u p p lie s
The MAX473/MAX474/MAX475 operate from a single
2.7V to 5.25V power supply, or from dual supplies of
± 1.35V to ± 2.625V. For s ing le -s up p ly op e ra tion,
bypass the power supply with 0.1µF. If operating from
dual supplies, bypass each supply to ground. With
0.1µF b yp a s s c a p a c ita nc e , c ha nne l s e p a ra tion
(MAX474/MAX475) is typically better than 120dB with
s ig na l fre q ue nc ie s up to 300kHz. Inc re a s ing the
bypass capacitance (e.g. 10µF || 0.1µF) maintains
channel separation at higher frequencies.
Ou t p u t Lo a d in g a n d S t a b ilit y
The MAX473/MAX474/MAX475 op amps are unity-gain
stable. Any op amp’s stability depends on the configu-
ration, closed-loop gain, and load capacitance. The
unity-gain, noninverting buffer is the most sensitive gain
configuration, and driving capacitive loads decreases
stability.
Min im izin g Offs e t s
The MAX473’s ma ximum offs e t volta g e is ± 2mV
(T = +25°C). If additional offset adjustment is required,
A
connect a 2kΩ trim potentiometer between pins 1, 8, and
4 (Figure 1). Input offset voltage for the dual MAX474
and quad MAX475 cannot be externally trimmed.
_______________________________________________________________________________________
9
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
R2
R1
V
IN
2k
V
OUT
1
8
NULL
NULL
R3
MAX473
R3 = R2 R1
Figure 2a. Reducing Offset Error Due to Bias Current:
Inverting Configuration
4
V
EE
Figure 1. Offset Null Circuit
R3
V
IN
V
OUT
The MAX473/MAX474/MAX475 have excellent phase
margin (the difference between 180° and the unity-gain
phase angle). It is typically 63° with a load of 10kΩ in
parallel with 20pF. Generally, higher phase margins
indicate greater stability.
3/MAX475
R2
R1
Capacitive loads form an RC network with the op amp’s
output resistance, causing additional phase shift that
re d uc e s the p ha s e ma rg in. Fig ure 3 s hows the
MAX473/MAX474/MAX475 output response when dri-
ving a 390pF load in parallel with 10kΩ.
R3 = R2 R1
Figure 2b. Reducing Offset Error Due to Bias Current:
Noninverting Configuration
When driving large capacitive loads, add an output iso-
la tion re s is tor, a s s hown in Fig ure 4. This re s is tor
imp rove s the p ha s e ma rg in b y is ola ting the loa d
capacitance from the amplifier output. Figure 5 shows
the MAX473/MAX474/MAX475 driving a capacitive load
of 1000pF using the circuit of Figure 4.
input frequencies above f , the pole introduces addi-
o
tional phase shift, which reduces the overall bandwidth
and adversely affects stability. Choose feedback resis-
tors small enough so they do not adversely affect the
op amp’s operation at the frequencies of interest.
Fe e d b a c k Re s is t o rs
The feedback resistors appear as a resistance network
to the op amp’s feedback input (Figure 2). This resis-
tance, combined with the op amp’s input and stray
capacitance (total input capacitance), forms a pole that
adds unwanted phase shift when either the total input
capacitance or feedback resistance is too large. For
example, using the noninverting configuration with a
gain of 10, if the total capacitance at the negative input
Ove rd rivin g t h e Ou t p u t s
The output voltage swing for specified operation is from
(V + 0.3V) to (V - 0.5V) (see Electrical Characteristics).
Exercising the outputs beyond these limits drives the out-
put transistors toward saturation, resulting in bandwidth
degradation, response-time increase, and gain decrease
(which affects linearity). Operation in this region causes a
slight distortion in the output waveform, but does not
adversely affect the op amp.
EE
CC
is 10pF and the effective resistance (R1 R2) is 9kΩ,
||
this RC network introduces a pole at f = 1.8MHz. At
o
10 ______________________________________________________________________________________
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
3/MAX475
Driving 390pF in parallel with 10kΩ,
= 5V, buffer configuration
V
CC
Figure 3. MAX474 Driving 390pF
Figure 5. The MAX473 easily drives 1000pF using the
Capacitive-Load Driving Circuit (Figure 4).
100
SMALL-SIGNAL
GAIN BANDWIDTH
10
MAX473/MAX474/
MAX475
R
L
10Ω
V
OUT
1
FULL-POWER
V
IN
BANDWIDTH
C
L
0.1
0
1
2
3
4
OUTPUT VOLTAGE SWING (Vp-p)
Figure 4. Capacitive-Load Driving Circuit
Figure 6. Full-Power Bandwidth vs. Peak-to-Peak AC Voltage
Fu ll-P o w e r Ba n d w id t h
The MAX473/MAX474/MAX475’s fast 15V/µs slew rate
maximizes full-power bandwidth (FPBW). The FPBW is
given by:
La yo u t
A good layout improves performance by decreasing
the a mount of s tra y c a p a c ita nc e a t the a mp lifie r’s
inputs and output. Since stray capacitance might be
unavoidable, minimize trace lengths and resistor leads,
and place external components as close to the pins as
possible.
SR
FPBW (Hz) = —————————————
π [V
peak-to-peak(max)]
OUT
where the slew rate (SR) is 15V/µs min. Figure 6 shows
the full-power bandwidth as a function of the peak-to-
peak AC output voltage.
______________________________________________________________________________________ 11
S in g le /Du a l/Qu a d , 1 0 MHz
S in g le -S u p p ly Op Am p s
_Ord e rin g In fo rm a t io n (c o n t in u e d )
_________________Ch ip To p o g ra p h ie s
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX473
MAX474CPA
MAX474CSA
MAX474CUA
MAX474C/D
MAX474EPA
MAX474ESA
MAX474MJA
MAX475CPD
MAX475CSD
MAX475EPD
MAX475ESD
MAX475MJD
0°C to +70°C
0°C to +70°C
8 µMAX
NULL
NULL
IN-
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
8 Plastic DIP
8 SO
V
CC
IN+
0. 065"
(1. 651mm)
8 CERDIP
14 Plastic DIP
14 SO
0°C to +70°C
V
EE
OUT
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
14 Plastic DIP
14 SO
14 CERDIP
0. 052"
(1. 321mm)
*
Dice are specified at T = +25°C, DC parameters only.
A
TRANSISTOR COUNT: 185
SUBSTRATE CONNECTED TO V
EE
____P in Co n fig u ra t io n s (c o n t in u e d )
MAX474
3/MAX475
V
CC
TOP VIEW
OUTA
INA-
OUTD
IND-
1
2
3
4
5
6
7
14
13
12
11
10
9
OUTB
INB-
OUTA
A
B
D
C
INA+
IND+
V
CC
V
EE
MAX475
INA-
0. 084"
INB+
INB-
INC+
INC-
(2. 134mm)
INA+
INB+
OUTB
OUTC
8
DIP/SO
V
EE
0. 058"
(1. 473mm)
TRANSISTOR COUNT: 355
SUBSTRATE CONNECTED TO V
EE
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 __________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 (4 0 8 ) 7 3 7 -7 6 0 0
© 1995 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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