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參數(shù)資料
| 型號： | ICL7650SCTV-1 |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | 2MHz, Super Chopper-Stabilized Operational Amplifier |
| 中文描述： | OP-AMP, 8 uV OFFSET-MAX, 2 MHz BAND WIDTH, MBCY8 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 144K |
| 代理商： | ICL7650SCTV-1 |
4
Test Circuit
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
necessarynulling-looptimeconstants.Thenullingarrangement
operatesoverthefullcommon-modeandpower-supplyranges,
and is also independent of the output level, thus giving
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.
INTERMODULATION
Previous chopper-stabilized amplifiers have suffered from
intermodulation effects between the chopper frequency and
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
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,
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.
CAPACITOR CONNECTION
The null/storage capacitors should be connected to the
C
EXTA
and C
EXTB
pins, with a common connection to the
C
RETN
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 C
RETN
.
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.
CLOCK
The ICL7650S has an internal oscillator, giving a chopping
frequency of 200Hz, availableat 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
Output Sink Current
I
O SINK
25
25
30
-
mA
0 to 70
20
-
-
mA
Internal Chopping Frequency
f
CH
Pins 13 and 14 Open
25
120
250
375
Hz
Clamp ON Current (Note 5)
R
L
= 100k
-4V
≤
V
OUT
≤
+4V
25
25
70
-
μ
A
Clamp OFF Current
(Note 5)
25
-
0.001
5
nA
0 to 70
-
-
10
nA
NOTES:
3. Theseparametersareguaranteedbydesignandcharacterization,butnottestedattemperatureextremesbecausethermocoupleeffectsprevent
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.
Electrical Specifications
V
SUPPLY
=
±
5V. See Test Circuit, Unless Otherwise Specified
(Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP.
(
o
C)
MIN
TYP
MAX
UNITS
ICL7650S
+
-
OUTPUT
R
2
1M
C
C
R
0.1
μ
F
0.1
μ
F
C
R
1
1M
ICL7650S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICL7650S | 2MHz, Super Chopper-Stabilized Operational Amplifier(2MHz斬波器穩(wěn)定的運(yùn)算放大器) |
| ICL7652ITV | Chopper Stabilized Operatlonal Amplifier |
| ICL7652IJA | Chopper Stabilized Operatlonal Amplifier |
| ICL7652IJD | Chopper Stabilized Operatlonal Amplifier |
| ICL7652CWE | Chopper Stabilized Operatlonal Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL7650SIJA-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL7650SIPA-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL7650SIPD | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL7650SITV-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL7650SMJD/HR WAF | 制造商:Harris Corporation 功能描述: |
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