5962-01-215-2354 [RENESAS]

IC,OP-AMP,SINGLE,CMOS,DIP,14PIN,PLASTIC;
5962-01-215-2354
型号: 5962-01-215-2354
厂家: RENESAS TECHNOLOGY CORP    RENESAS TECHNOLOGY CORP
描述:

IC,OP-AMP,SINGLE,CMOS,DIP,14PIN,PLASTIC

放大器 斩波器 光电二极管
文件: 总13页 (文件大小:322K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
ICL7650S  
®
Data Sheet  
April 12, 2007  
FN2920.10  
2MHz, Super Chopper-Stabilized  
Operational Amplifier  
Features  
Guaranteed Max Input Offset Voltage for All Temperature  
Ranges  
The ICL7650S Super Chopper-Stabilized Amplifier offers  
exceptionally low input offset voltage and is extremely stable  
with respect to time and temperature. It is a direct  
replacement for the industry-standard ICL7650 offering  
improved input offset voltage, lower input offset voltage  
temperature coefficient, reduced input bias current, and  
wider common mode voltage range. All improvements are  
highlighted in bold italics in the Electrical Characteristics  
section. Critical parameters are guaranteed over the  
entire commercial temperature range.  
• Low Long-Term and Temperature Drifts of Input Offset  
Voltage  
Guaranteed Max Input Bias Current . . . . . . . . . . . . .10pA  
Extremely Wide Common Mode  
Voltage Range. . . . . . . . . . . . . . . . . . . . . . . +3.5V to -5V  
Reduced Supply Current . . . . . . . . . . . . . . . . . . . . . . 2mA  
Guaranteed Minimum Output Source/Sink Current  
• Extremely High Gain . . . . . . . . . . . . . . . . . . . . . . . .150dB  
• Extremely High CMRR and PSRR. . . . . . . . . . . . . .140dB  
• High Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . . .2.5V/μs  
• Wide Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2MHz  
• Unity-Gain Compensated  
Intersil’s unique CMOS chopper-stabilized amplifier circuitry  
is user-transparent, virtually eliminating the traditional  
chopper amplifier problems of intermodulation effects,  
chopping spikes, and overrange lockup.  
The chopper amplifier achieves its low offset by comparing  
the inverting and non-inverting input voltages in a nulling  
amplifier, nulled by alternate clock phases. Two external  
capacitors are required to store the correcting potentials on  
the two amplifier nulling inputs; these are the only external  
components necessary.  
• Clamp Circuit to Avoid Overload Recovery Problems and  
Allow Comparator Use  
• Extremely Low Chopping Spikes at Input and Output  
Improved, Direct Replacement for Industry-Standard  
ICL7650 and other Second-Source Parts  
The clock oscillator and all the other control circuitry is  
entirely self-contained. However the 14 lead version includes  
a provision for the use of an external clock, if required for a  
particular application. In addition, the ICL7650S is internally  
compensated for unity-gain operation.  
• Pb-Free Plus Anneal Available (RoHS Compliant)  
Ordering Information  
PART  
PART  
NUMBER  
MARKING  
TEMP. RANGE (°C)  
0 to +70  
PACKAGE  
8 Ld SOIC  
8 Ld SOIC (Tape and Reel) M8.15  
8 Ld SOIC M8.15  
8 Ld SOIC (Tape and Reel) M8.15  
PKG. DWG. #  
ICL7650SCBA-1  
7650S CBA-1  
M8.15  
ICL7650SCBA-1T  
7650S CBA-1  
7650S CBA-1Z  
7650S CBA-1Z  
7650S CPA-1  
7650S CPA-1Z  
ICL7650SCPD  
7650SCPDZ  
0 to +70  
ICL7650SCBA-1Z (Note)  
ICL7650SCBA-1ZT (Note)  
ICL7650SCPA-1  
0 to +70  
0 to +70  
0 to +70  
8 Ld PDIP  
E8.3  
ICL7650SCPA-1Z (Note)  
ICL7650SCPD  
0 to +70  
8 Ld PDIP* (Pb-free)  
14 Ld PDIP  
E8.3  
0 to +70  
E14.3  
E14.3  
ICL7650SCPDZ  
0 to +70  
14 Ld PDIP* (Pb-free)  
*Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications.  
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin  
plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are  
MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright © Intersil Americas Inc. 2002-2005, 2007. All Rights Reserved  
All other trademarks mentioned are the property of their respective owners.  
ICL7650S  
Pinouts  
ICL7650S  
(8 LD PDIP, SOIC)  
TOP VIEW  
1
2
3
4
8
7
6
5
C
C
EXTB  
EXTA  
-IN  
V+  
-
+
+IN  
V-  
OUTPUT  
C
RETN  
ICL7650S  
(14 PDIP)  
TOP VIEW  
C
1
14 INT/EXT  
13 EXT CLK IN  
12 INT CLK OUT  
11 V+  
EXTB  
EXTA  
C
2
3
4
5
6
7
NC (GUARD)  
-IN  
-
+
+IN  
NC (GUARD)  
V-  
10 OUTPUT  
9
8
OUT CLAMP  
C
RETN  
Functional Diagram  
INT/EXT  
A
A
B
C
EXT CLK IN  
CLK OUT  
OSC  
.
EXT CLK IN  
INTERNAL  
BIAS  
A = CLK OUT  
P
+IN  
-IN  
+
A
MAIN  
-
OUTPUT  
CLAMP  
B
C
N
-
A
C
NULL  
A
+
B
CAP RETURN  
C
C
EXTB  
EXTA  
FN2920.10  
April 12, 2007  
2
Absolute Maximum Ratings  
Thermal Information  
Supply Voltage (V+ to V-). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V  
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . (V+ +0.3) to (V- -0.3)  
Voltage on Oscillator Control Pins . . . . . . . . . . . . . . . . . . . . V+ to V-  
Duration of Output Short Circuit. . . . . . . . . . . . . . . . . . . . . Indefinite  
Current to Any Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA  
While Operating (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . .100μA  
Thermal Resistance (Typical, Note 2)  
θ
(°C/W)  
θ
(°C/W)  
JC  
JA  
8 Lead PDIP Package* . . . . . . . . . . . .  
14 Lead PDIP Package . . . . . . . . . . . .  
8 Lead SOIC Package . . . . . . . . . . . . .  
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C  
Maximum Storage Temperature Range. . . . . . . . .. -55°C to +150°C  
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below  
http://www.intersil.com/pbfree/Pb-FreeReflow.asp  
*Pb-free PDIPs can be used for through hole wave solder  
processing only. They are not intended for use in Reflow solder  
processing applications.  
110  
90  
160  
N/A  
N/A  
N/A  
Operating Conditions  
Temperature Range  
ICL7650SC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C  
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the  
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.  
NOTES:  
1. Limiting input current to 100μA is recommended to avoid latchup problems. Typically 1mA is safe, however this is not guaranteed.  
2. θ is measured with the component mounted on an evaluation PC board in free air.  
JA  
Electrical Specifications  
V
= ±5V. See Test Circuit, Unless Otherwise Specified  
SUPPLY  
TEMP.  
(°C)  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
MIN  
TYP  
±0.7  
±1  
MAX  
±5  
±8  
-
UNITS  
μV  
Input Offset Voltage (Note 3)  
V
+25  
-
-
-
OS  
0 to +70  
0 to +70  
μV  
Average Temperature Coefficient of  
ΔV /ΔT  
OS  
0.02  
μV/°C  
Input Offset Voltage (Note 3)  
Change in Input Offset with Time  
ΔV /ΔT  
OS  
+25  
+25  
-
-
100  
4
-
10  
20  
20  
40  
-
nV/month  
Input Bias Current |I(+)|, |I(-)|  
I
pA  
pA  
pA  
pA  
Ω
BIAS  
0 to +70  
+25  
-
5
Input Offset Current |I(-), |I(+)|  
I
-
8
OS  
0 to +70  
+25  
-
10  
12  
Input Resistance  
R
-
10  
IN  
Large Signal Voltage Gain (Note 3)  
A
R
= 10kΩ, V = ±4V  
+25  
135  
130  
±4.7  
-
150  
-
dB  
dB  
V
VOL  
L
O
0 to +70  
+25  
-
-
Output Voltage Swing (Note 4)  
V
R
R
= 10kΩ  
±4.85  
-
OUT  
L
L
= 100kΩ  
+25  
±4.95  
-
V
Common Mode Voltage Range (Note 3)  
CMVR  
CMRR  
PSRR  
+25  
-5  
-5  
120  
120  
120  
-
-5.2 to +4  
3.5  
3.5  
-
V
0 to +70  
+25  
-
140  
-
V
Common Mode Rejection Ratio  
(Note 3)  
CMVR = -5V to +3.5V  
dB  
dB  
dB  
0 to +70  
+25  
-
Power Supply Rejection Ratio  
Input Noise Voltage  
V
= ±3V to ±8V  
= 100Ω,  
140  
2
-
S
e
R
+25  
-
μV  
P-P  
N
S
f = DC to 10Hz  
Input Noise Current  
Gain Bandwidth Product  
Slew Rate  
i
f = 10Hz  
+25  
+25  
-
0.01  
2
-
-
pA/Hz  
MHz  
V/μs  
μs  
N
GBWP  
SR  
-
C
= 50pF, R = 10kΩ  
+25  
-
2.5  
0.2  
20  
-
-
L
L
Rise Time  
t
+25  
-
-
R
Overshoot  
OS  
+25  
-
4.5  
-
-
%
Operating Supply Range  
Supply Current  
V+ to V-  
+25  
16  
3
V
I
No Load  
+25  
2
mA  
mA  
SUPP  
0 to +70  
-
-
3.2  
FN2920.10  
April 12, 2007  
3
Electrical Specifications  
V
= ±5V. See Test Circuit, Unless Otherwise Specified (Continued)  
SUPPLY  
TEMP.  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
(°C)  
MIN  
2.9  
2.3  
25  
20  
120  
25  
-
TYP  
4.5  
-
MAX  
UNITS  
mA  
mA  
mA  
mA  
Hz  
Output Source Current  
I
+25  
-
O SOURCE  
0 to +70  
+25  
-
-
Output Sink Current  
I
30  
-
O SINK  
0 to +70  
+25  
-
Internal Chopping Frequency  
Clamp ON Current (Note 5)  
Clamp OFF Current (Note 5)  
f
Pins 13 and 14 Open  
250  
70  
0.001  
-
375  
-
CH  
R
= 100kΩ  
+25  
μA  
L
-4V V  
+4V  
+25  
5
nA  
OUT  
0 to +70  
-
10  
nA  
NOTES:  
3. These parameters are guaranteed by design and characterization, but not tested at temperature extremes because thermocouple effects prevent  
precise measurement of these voltages in automatic test equipment.  
4. OUTPUT CLAMP not connected. See typical characteristic curves for output swing vs clamp current characteristics.  
5. See OUTPUT CLAMP under detailed description.  
6. All significant improvements over the industry-standard ICL7650 are highlighted in bold italics.  
INTERMODULATION  
Test Circuit  
R
1MΩ  
Previous chopper-stabilized amplifiers have suffered from  
intermodulation effects between the chopper frequency and  
2
R
1MΩ  
input signals. These arise because the finite AC gain of the  
amplifier necessitates a small AC signal at the input. This is  
seen by the zeroing circuit as an error signal, which is  
1
-
ICL7650S  
OUTPUT  
chopped and fed back, thus injecting sum and difference  
frequencies and causing disturbances to the gain and phase  
vs frequency characteristics near the chopping frequency.  
These effects are substantially reduced in the ICL7650S by  
feeding the nulling circuit with a dynamic current,  
C
+
C
R
C
0.1μF  
0.1μF  
corresponding to the compensation capacitor current, in such  
a way as to cancel that portion of the input signal due to finite  
AC gain. Since that is the major error contribution to the  
ICL7650S, the intermodulation and gain/phase disturbances  
are held to very low values, and can generally be ignored.  
Application Information  
Detailed Description  
AMPLIFIER  
The functional diagram shows the major elements of the  
ICL7650S. There are two amplifiers, the main amplifier, and the  
nulling amplifier. Both have offset-null capability. The main  
amplifier is connected continuously from the input to the output,  
while the nulling amplifier, under the control of the chopping  
oscillator and clock circuit, alternately nulls itself and the main  
amplifier. The nulling connections, which are MOSFET gates,  
are inherently high impedance, and two external capacitors  
provide the required storage of the nulling potentials and the  
necessary nulling-loop time constants. The nulling arrangement  
operates over the full common-mode and power-supply  
ranges, and is also independent of the output level, thus giving  
CAPACITOR CONNECTION  
The null/storage capacitors should be connected to the  
CEXTA and CEXTB pins, with a common connection to the  
CRETN pin. This connection should be made directly by  
either a separate wire or PC trace to avoid injecting load  
current IR drops into the capacitive circuitry. The outside foil,  
where available, should be connected to CRETN.  
OUTPUT CLAMP  
The OUTPUT CLAMP pin allows reduction of the overload  
recovery time inherent with chopper-stabilized amplifiers.  
When tied to the inverting input pin, or summing junction, a  
current path between this point and the OUTPUT pin occurs  
just before the device output saturates. Thus uncontrolled  
input differentials are avoided, together with the consequent  
charge buildup on the correction-storage capacitors. The  
output swing is slightly reduced.  
exceptionally high CMRR, PSRR, and A  
.
VOL  
Careful balancing of the input switches, and the inherent  
balance of the input circuit, minimizes chopper frequency  
charge injection at the input terminals, and also the feed  
forward-type injection into the compensation capacitor, which  
is the main cause of output spikes in this type of circuit.  
FN2920.10  
April 12, 2007  
4
CLOCK  
the same time or before any input signals are applied. If this is  
not possible, the drive circuits must limit input current flow to  
under 1mA to avoid latchup, even under fault conditions.  
The ICL7650S has an internal oscillator, giving a chopping  
frequency of 200Hz, available at the CLOCK OUT pin on the 14  
pin devices. Provision has also been made for the use of an  
external clock in these parts. The INT/EXT pin has an internal  
pull-up and may be left open for normal operation, but to utilize  
an external clock this pin must be tied to V- to disable the  
internal clock. The external clock signal may then be applied to  
the EXT CLOCK IN pin. An internal divide-by-two provides the  
desired 50% input switching duty cycle. Since the capacitors  
are charged only when EXT CLOCK IN is high, a 50% to 80%  
positive duty cycle is recommended, especially for higher  
frequencies. The external clock can swing between V+ and V-.  
The logic threshold will be at about 2.5V below V+. Note also  
that a signal of about 400 Hz, with a 70% duty cycle, will be  
present at the EXT CLOCK IN pin with INT/EXT high or open.  
This is the internal clock signal before being fed to the divider.  
OUTPUT STAGE/LOAD DRIVING  
The output circuit is a high-impedance type (approximately  
18kΩ), and therefore with loads less than this value, the  
chopper amplifier behaves in some ways like a  
transconductance amplifier whose open-loop gain is  
proportional to load resistance. For example, the open-loop  
gain will be 17dB lower with a 1kΩ load than with a 10kΩ  
load. If the amplifier is used strictly for DC, this lower gain is  
of little consequence, since the DC gain is typically greater  
than 120dB even with a 1kΩ load. However, for wideband  
applications, the best frequency response will be achieved  
with a load resistor of 10kΩ or higher. This will result in a  
smooth 6dB/octave response from 0.1Hz to 2MHz, with  
phase shifts of less than 10° in the transition region where  
the main amplifier takes over from the null amplifier.  
In those applications where a strobe signal is available, an  
alternate approach to avoid capacitor misbalancing during  
overload can be used. If a strobe signal is connected to EXT  
CLK IN so that it is low during the time that the overload  
signal is applied to the amplifier, neither capacitor will be  
charged. Since the leakage at the capacitor pins is quite low  
at room temperature, the typical amplifier will drift less than  
10μV/s, and relatively long measurements can be made with  
little change in offset.  
THERMO-ELECTRIC EFFECTS  
The ultimate limitations to ultra-high precision DC amplifiers are  
the thermo-electric or Peltier effects arising in thermocouple  
junctions of dissimilar metals, alloys, silicon, etc. Unless all  
junctions are at the same temperature, thermoelectric voltages  
typically around 0.1μV/°C, but up to tens of mV/°C for some  
materials, will be generated. In order to realize the extremely  
low offset voltages that the chopper amplifier can provide, it is  
essential to take special precautions to avoid temperature  
gradients. All components should be enclosed to eliminate air  
movement, especially that caused by power-dissipating  
elements in the system. Low thermoelectric-efficient  
COMPONENT SELECTION  
The two required capacitors, C  
EXTA  
and C , have  
EXTB  
optimum values depending on the clock or chopping  
frequency. For the preset internal clock, the correct value is  
0.1μF, and to maintain the same relationship between the  
chopping frequency and the nulling time constant this value  
should be scaled approximately in proportion if an external  
clock is used. A high quality film type capacitor such as  
mylar is preferred, although a ceramic or other lower-grade  
capacitor may prove suitable in many applications. For  
quickest settling on initial turn-on, low dielectric absorption  
capacitors (such as polypropylene) should be used. With  
ceramic capacitors, several seconds may be required to  
settle to 1μV.  
connections should be used where possible and power supply  
voltages and power dissipation should be kept to a minimum.  
High-impedance loads are preferable, and good separation  
from surrounding heat-dissipating elements is advisable.  
GUARDING  
Extra care must be taken in the assembly of printed circuit  
boards to take full advantage of the low input currents of the  
ICL7650S. Boards must be thoroughly cleaned with TCE or  
alcohol and blown dry with compressed air. After cleaning,  
the boards should be coated with epoxy or silicone rubber to  
prevent contamination.  
STATIC PROTECTION  
All device pins are static-protected by the use of input diodes.  
However, strong static fields and discharges should be avoided,  
as they can cause degraded diode junction characteristics,  
which may result in increased input-leakage currents.  
Even with properly cleaned and coated boards, leakage  
currents may cause trouble, particularly since the input pins  
are adjacent to pins that are at supply potentials. This  
leakage can be significantly reduced by using guarding to  
lower the voltage difference between the inputs and adjacent  
metal runs. The guard, which is a conductive ring  
surrounding the inputs, is connected to a low impedance  
point that is at approximately the same voltage as the inputs.  
Leakage currents from high-voltage pins are then absorbed  
by the guard.  
LATCHUP AVOIDANCE  
Junction-isolated CMOS circuits inherently include a parasitic  
4-layer (PNPN) structure which has characteristics similar to  
an SCR. Under certain circumstances this junction may be  
triggered into a low-impedance state, resulting in excessive  
supply current. To avoid this condition, no voltage greater than  
0.3V beyond the supply rails should be applied to any pin. In  
general, the amplifier supplies must be established either at  
FN2920.10  
April 12, 2007  
5
INPUT  
R
R
2
1
-
+
-
+
OUTPUT  
OUTPUT  
INPUT  
FIGURE 1B. FOLLOWER  
FIGURE 1A. INVERTING AMPLIFIER  
R
2
-
+
OUTPUT  
R
1
INPUT  
R
R
SHOULD BE LOW  
IMPEDANCE FOR  
OPTIMUM GUARDING  
1
2
---------------------  
NOTE:  
R
+ R  
2
1
FIGURE 1C. NON-INVERTING AMPLIFIER  
FIGURE 1. CONNECTION OF INPUT GUARDS  
PIN COMPATIBILITY  
as shown in Figure 4, to enable the full output capabilities of  
the LM741 (or any other standard device) to be combined  
with the input capabilities of the ICL7650S. The pair form a  
composite device, so loop gain stability, when the feedback  
network is added, should be watched carefully.  
The basic pinout of the 8-pin device corresponds, where  
possible, to that of the industry standard 8-pin devices, the  
LM741, LM101, etc. The null-storing external capacitors are  
connected to pins 1 and 8, usually used for offset null or  
compensation capacitors, or simply not connected. In the  
case of the OP-05 and OP-07 devices, the replacement of  
the offset-null pot, connected between pins 1 and 8 and V+,  
by two capacitors from those pins to pin 5, will provide easy  
compatibility. As for the LM108, replacement of the  
compensation capacitor between pins 1 and 8 by the two  
capacitors to pin 5 is all that is necessary. The same  
operation, with the removal of any connection to pin 5, will  
suffice for the LM101, μA748, and similar parts.  
0.1μF  
0.1μF  
C
R
INPUT  
+
C
OUTPUT  
7650S  
-
R
R
2
1
CLAMP  
R
3
R
+ (R ||R ) 100kΩ  
1 2  
3
For Full Clamp Effect  
NOTE: R ||R indicates the parallel combination of R and R .  
1
2
1
2
The 14-pin device pinout corresponds most closely to that of  
the LM108 device, owing to the provision of “NC” pins for  
guarding between the input and all other pins. Since this  
device does not use any of the extra pins, and has no  
provision for offset-nulling, but requires a compensation  
capacitor, some changes will be required in layout to convert  
it to the ICL7650S.  
FIGURE 2. NON INVERTING AMPLIFIER WITH OPTIONAL CLAMP  
Figure 5 shows the use of the clamp circuit to advantage in a  
zero-offset comparator. The usual problems in using a  
chopper stabilized amplifier in this application are avoided,  
since the clamp circuit forces the inverting input to follow the  
input signal. The threshold input must tolerate the output  
clamp current V /R without disturbing other portions of the  
lN  
Typical Applications  
system.  
Clearly the applications of the ICL7650S will mirror those of  
other op amps. Anywhere that the performance of a circuit  
can be significantly improved by a reduction of input-offset  
voltage and bias current, the ICL7650S is the logical choice.  
Basic non-inverting and inverting amplifier circuits are shown  
in Figures 2 and 3. Both circuits can use the output clamping  
circuit to enhance the overload recovery performance. The  
only limitations on the replacement of other op amps by the  
ICL7650S are the supply voltage (±8V Max) and the output  
drive capability (10kΩ load for full swing). Even these  
The pin configuration of the 14 pin dual in-line package is  
designed to facilitate guarding, since the pins adjacent to the  
inputs are not used (this is different from the standard 741 and  
101A pin configuration, but corresponds to that of the LM108).  
limitations can be overcome using a simple booster circuit,  
FN2920.10  
April 12, 2007  
6
R
CLAMP  
2
+7.5V  
+15V  
-15V  
+
CLAMP  
7650S  
-
+
741  
-
R
IN  
1
-
INPUT  
OUT  
7650S  
OUTPUT  
-7.5V  
+
C
R
C
0.1μF  
0.1μF  
10kΩ  
10kΩ  
0.1μF  
0.1μF  
(R ||R ) 100kΩ  
1
2
For Full Clamp Effect  
NOTE: R ||R indicates the parallel combination of R and R .  
1
2
1
2
FIGURE 4. USING 741 TO BOOST OUTPUT DRIVE CAPACITY  
FIGURE 3. INVERTING AMPLIFIER WITH (OPTIONAL) CLAMP  
0.1μF  
0.1μF  
C
R
V
+
C
IN  
V
7650S  
OUT  
-
R
CLAMP  
V
TH  
200kΩ - 2MΩ  
FIGURE 5. LOW OFFSET COMPARATOR  
V+  
R
REF  
V
REF  
(+15V)  
R
5
I
-
REF  
33kΩ  
33kΩ  
2kΩ  
ICL7650S  
5
4
16  
13  
12  
+
Q
Q
2
1
I
IN  
2
1
R
3
-
+
V
+
IN  
A
V
1
A
OUT  
2
R
IN  
-
10  
R
1
ICL8048  
GROUND  
15.9kΩ  
680Ω  
GAIN  
15  
R
1kΩ  
7
C
2
150pF  
1
(LOW T.C.)  
R
0
10kΩ  
NOTE: For further Applications Assistance, see AN053.  
FIGURE 6. ICL8048 OFFSET NULLED BY ICL7650S  
Normal logarithmic amplifiers are limited in dynamic range in  
the voltage-input mode by their input-offset voltage. The  
built-in temperature compensation and convenience  
capability to their very high slew rates and bandwidths. Note  
that these circuits will also have their DC gains, CMRR, and  
PSRR enhanced.  
features of the ICL8048 can be extended to a voltage-input  
dynamic range of close to 6 decades by using the ICL7650S  
to offset-null the ICL8048, as shown in Figure 6. The same  
concept can also be used with such devices as the HA2500  
or HA2600 families of op amps to add very low offset voltage  
FN2920.10  
April 12, 2007  
7
Typical Performance Curves  
3
3
2
1
0
2
1
0
-50  
-25  
0
25  
50  
75  
100  
125  
4
6
8
10  
12  
14  
16  
TEMPERATURE (°C)  
TOTAL SUPPLY VOLTAGE (V)  
FIGURE 7. SUPPLY CURRENT vs SUPPLY VOLTAGE  
FIGURE 8. SUPPLY CURRENT vs AMBIENT TEMPERATURE  
8
7
8
6
NEGATIVE  
6
4
LIMIT  
5
2
POSITIVE  
LIMIT  
4
3
2
1
0
0
-10  
-20  
-30  
0
1
2
3
4
5
6
7
8
2
4
6
8
10  
12  
14  
16  
SUPPLY VOLTAGE (±V)  
TOTAL SUPPLY VOLTAGE (V)  
FIGURE 10. COMMON MODE INPUT VOLTAGE RANGE vs  
SUPPLY VOLTAGE  
FIGURE 9. MAXIMUM OUTPUT CURRENT vs SUPPLY  
VOLTAGE  
4
3
100  
0.1μF  
BROADBAND NOISE  
(A = 1000)  
V
10  
1
2
1.0μF  
1
0
0.1  
25  
50  
75  
100  
125  
150  
10  
100  
1k  
10k  
o
TEMPERATURE ( C)  
CHOPPING FREQUENCY - CLOCK OUT (Hz)  
FIGURE 11. CLOCK RIPPLE REFERRED TO THE INPUT vs  
TEMPERATURE  
FIGURE 12. 10Hz NOISE VOLTAGE vs CHOPPING  
FREQUENCY  
FN2920.10  
April 12, 2007  
8
Typical Performance Curves (Continued)  
8
6
4
3
2
1
0
-1  
-2  
-3  
2
0
10  
100  
1k  
10k  
4
6
8
10  
12  
14  
16  
CHOPPING FREQUENCY - CLOCK OUT (Hz)  
TOTAL SUPPLY VOLTAGE (V)  
FIGURE 14. INPUT OFFSET VOLTAGE vs CHOPPING  
FREQUENCY  
FIGURE 13. INPUT OFFSET VOLTAGE CHANGE vs SUPPLY  
VOLTAGE  
160  
R
C
= 10kΩ  
L
= 0.1μF  
EXT  
140  
120  
50  
20  
0
70  
100  
80  
90  
20  
110  
130  
60  
40  
20  
1
2
3
4
5
6
7
8
9
0.01  
0.1  
1
10  
100  
1k  
10k 100k  
FREQUENCY (Hz)  
TIME (ms)  
FIGURE 15. OUTPUT WITH ZERO INPUT; GAIN = 1000;  
FIGURE 16. OPEN LOOP GAIN AND PHASE SHIFT vs  
FREQUENCY  
BALANCED SOURCE IMPEDANCE = 10kΩ  
FN2920.10  
April 12, 2007  
9
Typical Performance Curves (Continued)  
160  
2
1
R
C
= 10kΩ  
L
= 1μF  
EXT  
140  
120  
100  
80  
CLOCK OUT  
LOW  
50  
CLOCK OUT  
HIGH  
70  
0
90  
-1  
-2  
110  
130  
60  
40  
20  
0
0.5  
1.0  
1.5  
2.0  
2.5  
TIME (μs)  
0.01  
0.1  
1
10  
100  
1k  
10k  
100k  
NOTE: The two different responses correspond to the two phases of  
the clock.  
FREQUENCY (Hz)  
FIGURE 17. OPEN LOOP GAIN AND PHASE SHIFT vs  
FREQUENCY  
FIGURE 18. VOLTAGE FOLLOWER LARGE SIGNAL PULSE  
RESPONSE (NOTE)  
100μA  
10μA  
2
1
0
1μA  
100nA  
10nA  
1nA  
CLOCK OUT  
LOW  
CLOCK OUT  
HIGH  
-1  
-2  
100pA  
10pA  
1pA  
0
0.5  
1.0  
TIME (μS)  
1.5  
2.0  
0.8  
0.6  
0.4  
0.2  
0
NOTE:  
OUTPUT VOLTAGE (ΔV-)  
The two different responses correspond to the two phases of the clock.  
FIGURE 19. VOLTAGE FOLLOWER LARGE SIGNAL PULSE  
RESPONSE (NOTE)  
FIGURE 20. N-CHANNEL CLAMP CURRENT vs OUTPUT  
VOLTAGE  
100μA  
10μA  
1μA  
100nA  
10nA  
1nA  
100pA  
10pA  
1pA  
-0.8  
-0.6  
-0.4  
-0.2  
0
OUTPUT VOLTAGE (ΔV+)  
FIGURE 21. P-CHANNEL CLAMP CURRENT vs OUTPUT VOLTAGE  
FN2920.10  
April 12, 2007  
10  
Dual-In-Line Plastic Packages (PDIP)  
E8.3 (JEDEC MS-001-BA ISSUE D)  
N
8 LEAD DUAL-IN-LINE PLASTIC PACKAGE  
E1  
INDEX  
AREA  
INCHES  
MILLIMETERS  
1 2  
3
N/2  
SYMBOL  
MIN  
MAX  
0.210  
-
MIN  
-
MAX  
5.33  
-
NOTES  
-B-  
-C-  
A
A1  
A2  
B
-
4
-A-  
D
E
0.015  
0.115  
0.014  
0.045  
0.008  
0.355  
0.005  
0.300  
0.240  
0.39  
2.93  
0.356  
1.15  
0.204  
9.01  
0.13  
7.62  
6.10  
4
BASE  
PLANE  
0.195  
0.022  
0.070  
0.014  
0.400  
-
4.95  
0.558  
1.77  
0.355  
10.16  
-
-
A2  
A
-
SEATING  
PLANE  
L
C
L
B1  
C
8, 10  
D1  
B1  
eA  
-
A
A
1
D1  
e
D
5
eC  
C
B
eB  
D1  
E
5
0.010 (0.25) M  
C
B S  
0.325  
0.280  
8.25  
7.11  
6
NOTES:  
E1  
e
5
1. Controlling Dimensions: INCH. In case of conflict between  
0.100 BSC  
0.300 BSC  
2.54 BSC  
7.62 BSC  
-
English and Metric dimensions, the inch dimensions control.  
e
e
6
A
B
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.  
-
0.430  
0.150  
-
10.92  
3.81  
7
3. Symbols are defined in the “MO Series Symbol List” in Section  
2.2 of Publication No. 95.  
L
0.115  
2.93  
4
9
4. Dimensions A, A1 and L are measured with the package seated  
N
8
8
in JEDEC seating plane gauge GS-3.  
Rev. 0 12/93  
5. D, D1, and E1 dimensions do not include mold flash or protru-  
sions. Mold flash or protrusions shall not exceed 0.010 inch  
(0.25mm).  
e
6. E and  
pendicular to datum  
7. e and e are measured at the lead tips with the leads uncon-  
are measured with the leads constrained to be per-  
A
-C-  
.
B
C
strained. e must be zero or greater.  
C
8. B1 maximum dimensions do not include dambar protrusions.  
Dambar protrusions shall not exceed 0.010 inch (0.25mm).  
9. N is the maximum number of terminal positions.  
10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3,  
E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch  
(0.76 - 1.14mm).  
FN2920.10  
April 12, 2007  
11  
Dual-In-Line Plastic Packages (PDIP)  
N
E14.3 (JEDEC MS-001-AA ISSUE D)  
E1  
14 LEAD DUAL-IN-LINE PLASTIC PACKAGE  
INDEX  
AREA  
1 2  
3
N/2  
INCHES  
MILLIMETERS  
-B-  
-C-  
SYMBOL  
MIN  
MAX  
0.210  
-
MIN  
-
MAX  
5.33  
-
NOTES  
-A-  
A
A1  
A2  
B
-
4
D
E
0.015  
0.115  
0.014  
0.045  
0.008  
0.735  
0.005  
0.300  
0.240  
0.39  
2.93  
0.356  
1.15  
0.204  
18.66  
0.13  
7.62  
6.10  
4
BASE  
PLANE  
A2  
A
0.195  
0.022  
0.070  
0.014  
0.775  
-
4.95  
0.558  
1.77  
0.355  
19.68  
-
-
SEATING  
PLANE  
-
L
C
L
B1  
C
8
D1  
B1  
eA  
A1  
A
D1  
-
e
eC  
C
B
D
5
eB  
0.010 (0.25) M  
C
B S  
D1  
E
5
NOTES:  
0.325  
0.280  
8.25  
7.11  
6
1. Controlling Dimensions: INCH. In case of conflict between English  
and Metric dimensions, the inch dimensions control.  
E1  
e
5
0.100 BSC  
0.300 BSC  
2.54 BSC  
7.62 BSC  
-
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.  
e
e
6
A
B
3. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of  
Publication No. 95.  
-
0.430  
0.150  
-
10.92  
3.81  
7
4. Dimensions A, A1 and L are measured with the package seated in  
L
0.115  
2.93  
4
9
JEDEC seating plane gauge GS-3.  
N
14  
14  
5. D, D1, and E1 dimensions do not include mold flash or protrusions.  
Mold flash or protrusions shall not exceed 0.010 inch (0.25mm).  
Rev. 0 12/93  
e
6. E and  
dicular to datum  
7. e and e are measured at the lead tips with the leads uncon-  
are measured with the leads constrained to be perpen-  
A
-C-  
.
B
C
strained. e must be zero or greater.  
C
8. B1maximumdimensionsdonotincludedambarprotrusions. Dambar  
protrusions shall not exceed 0.010 inch (0.25mm).  
9. N is the maximum number of terminal positions.  
10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3, E28.3,  
E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 -  
1.14mm).  
FN2920.10  
April 12, 2007  
12  
Small Outline Plastic Packages (SOIC)  
N
M8.15 (JEDEC MS-012-AA ISSUE C)  
INDEX  
AREA  
0.25(0.010)  
M
B M  
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE  
H
E
INCHES  
MILLIMETERS  
-B-  
SYMBOL  
MIN  
MAX  
MIN  
1.35  
0.10  
0.33  
0.19  
4.80  
3.80  
MAX  
1.75  
0.25  
0.51  
0.25  
5.00  
4.00  
NOTES  
A
A1  
B
C
D
E
e
0.0532  
0.0040  
0.013  
0.0688  
0.0098  
0.020  
-
1
2
3
L
-
9
SEATING PLANE  
A
0.0075  
0.1890  
0.1497  
0.0098  
0.1968  
0.1574  
-
-A-  
o
h x 45  
D
3
4
-C-  
α
µ
0.050 BSC  
1.27 BSC  
-
e
A1  
H
h
0.2284  
0.0099  
0.016  
0.2440  
0.0196  
0.050  
5.80  
0.25  
0.40  
6.20  
0.50  
1.27  
-
C
B
0.10(0.004)  
5
0.25(0.010) M  
C A M B S  
L
6
N
α
8
8
7
NOTES:  
0°  
8°  
0°  
8°  
-
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of  
Publication Number 95.  
Rev. 1 6/05  
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.  
3. Dimension “D” does not include mold flash, protrusions or gate burrs.  
Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006  
inch) per side.  
4. Dimension “E” does not include interlead flash or protrusions. Inter-  
lead flash and protrusions shall not exceed 0.25mm (0.010 inch) per  
side.  
5. The chamfer on the body is optional. If it is not present, a visual index  
feature must be located within the crosshatched area.  
6. “L” is the length of terminal for soldering to a substrate.  
7. “N” is the number of terminal positions.  
8. Terminal numbers are shown for reference only.  
9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater  
above the seating plane, shall not exceed a maximum value of  
0.61mm (0.024 inch).  
10. Controlling dimension: MILLIMETER. Converted inch dimensions  
are not necessarily exact.  
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.  
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality  
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without  
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and  
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result  
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.  
For information regarding Intersil Corporation and its products, see www.intersil.com  
FN2920.10  
April 12, 2007  
13  

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