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TC7650 Fiches technique(PDF) 4 Page - Microchip Technology

No de pièce TC7650
Description  Chopper Stabilized Operational Amplifier
Download  14 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7650 Fiches technique(HTML) 4 Page - Microchip Technology

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TC7650
DS21463C-page 4
 2001-2012 Microchip Technology Inc.
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
3.0
DETAILED DESCRIPTION
3.1
Theory of Operation
Figure 3-1 shows the major elements of the TC7650.
There are two amplifiers (the main amplifier and the
nulling amplifier), and both have offset null capability.
The main amplifier is connected full-time from the input
to the output. The nulling amplifier, under the control of
the chopping frequency oscillator and clock circuit,
alternately nulls itself and the main amplifier. Two exter-
nal capacitors provide the required storage of the null-
ing 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 excep-
tionally high CMRR, PSRR and AVOL.
Careful balancing of the input switches minimizes
chopper frequency charge injection at the input termi-
nals, and the feed forward type injection into the com-
pensation capacitor that can cause output spikes in this
type of circuit.
The circuit's offset voltage compensation is easily
shown. With the nulling inputs shorted, a voltage
almost identical to the nulling amplifier offset voltage is
stored on CA. The effective offset voltage at the null
amplifier input is:
EQUATION 3-1:
After the nulling amplifier is zeroed, the main amplifier
is zeroed; the A switches open and B switches close.
The output voltage equation is:
EQUATION 3-2:
EQUATION 3-3:
As desired, the device offset voltages are reduced by
the high open loop gain of the nulling amplifier.
3.2
Output Stage/Loading
The output circuit is a high impedance stage (approxi-
mately 18k
). With loads less than this, the chopper
amplifier behaves in some ways like a trans-conduc-
tance amplifier whose open-loop gain is proportional to
load resistance. For example, the open loop gain will
be 17dB lower with a 1k
 load than with a 10k load.
If the amplifier is used strictly for DC, the lower gain is
of little consequence, since the DC gain is typically
greater than 120dB, even with a 1k
 load. In wideband
applications, the best frequency response will be
achieved with a load resistor of 10k
 or higher. This
results in a smooth 6dB/octave response from 0.1Hz to
2MHz, with phase shifts of less than 10° in the transi-
Pin Number
Symbol
Description
8-pin DIP
14-pin DIP
1,8
2,1
CA, CB
Nulling capacitor pins
2
4
-INPUT
Inverting Input
3
5
+INPUT
Non-inverting Input
47
VSS
Negative Power Supply
59
OUTPUT
CLAMP
Output Voltage Clamp
610
OUTPUT
Output
711
VDD
Positive Power Supply
3,6
NC
No internal connection
—8
CRETN
Capacitor current return pin
12
INT CLK OUT
Internal Clock Output
13
EXT CLK IN
External Clock Input
14
INT/EXT
Select Internal or External Clock
V
OSE
1
A
N
1
+
------------------V
OSN
=
VOUT = AMVOSM + (V
+ - V-) + A
N(V
+ - V-) + A
N VOSE
V
OUT
A
M
A
N
V
+
V
-

V
OSM
V
OSN
+
A
N
-------------------------------------------
+
=


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