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2002 Microchip Technology Inc.

DS21464B-page 1

Features

· Low Offset Over Temperature Range: 10

· Ultra Low Long Term Drift: 150nV/Month

· Low Temperature Drift: 100nV/

· Low DC Input Bias Current: 15pA

· High Gain, CMRR and PSRR: 110dB Min

· Low Input Noise Voltage: 0.2

p-p

(DC to 1Hz)

· Internally Compensated for Unity Gain Operation

· Clamp Circuit for Fast Overload Recovery

Applications

· Instrumentation

· Medical Instrumentation

· Embedded Control

· Temperature Sensor Amplifier

· Strain Gage Amplifier

Device Selection Table

Package Type

General Description

The TC7652 is a lower noise version of the TC7650,
sacrificing some input specifications (bias current and
bandwidth) to achieve a 10x reduction in noise. All the
other benefits of the chopper technique are present,
(i.e, freedom from offset adjust, drift and reliability prob-
lems from external trim components). Like the TC7650,
the TC7652 requires only two noncritical external caps
for storing the chopped null potentials. There are no
significant chopping spikes, internal effects or over-
range lockup problems.

Part Number

Package

Temperature

Range

TC7652CPA

8-Pin Plastic DIP

0°C to +70°C

TC7652CPD

14-Pin Plastic DIP

0°C to +70°C

Output

TC7652CPA

-Input

+Input

Output
Clamp

NC = No Internal Connection
(May Be Used As Input Guard)

INT/EXT

EXT CLK
In
INT CLK
Out

Output

Output
Clamp

RETN

-Input

+Input

TC7652CPD

8-Pin DIP

14-Pin DIP

TC7652

Low Noise, Chopper Stabilized Operational Amplifier

2002 Microchip Technology Inc.

DS21464B-page 3

TC7652

1.0

ELECTRICAL
CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS*

Total Supply Voltage (V

to V

) .......................+18V

Input Voltage .................... (V

+0.3V) to (V

0.3V)

Voltage on Oscillator Control Pins...............V

to V

Duration of Output Short Circuit ..................... Indefinite

Current Into Any Pin............................................ 10mA

While Operating (Note 1)............................ 100

Package Power Dissipation (T

< 70°C

)

8-Pin Plastic DIP ....................................... 730mW

14-Pin Plastic DIP ..................................... 800mW

Storage Temperature Range .............. -65°C to +150°C

Operating Temperature Range

C Device .......................................... 0°C to +70°C

I Device ......................................... -25°C to +85°C

*Stresses above 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 above those indi-
cated in the operation sections of the specifications is not
implied. Exposure to Absolute Maximum Rating conditions
for extended periods my affect device reliability.

TC7652 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: V

= +5V, V

= -5V, T

= +25°C, unless otherwise indicated.

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

Input Offset Voltage

±2

±5

= +25°C

TCV

Average Temperature Co-efficient of
Input Offset Voltage

0.01

0.05

V/°C

0°C < T

< +70°C

/DT

Offset Voltage vs Time

150

nV/mo

BIAS

Input Bias Current (CLK On)

--
--
--

100
250

100

1000

= +25°C

0°C < T

< +70°C

-25°C < T

< +85°C

BIAS

Input Bias Current (CLK Off)

--
--
--

15
35

100

1000

= +25°C

0°C < T

< +70°C

-25°C < T

< +85°C

Input Offset Current

150

Input Resistance

Large Signal Voltage Gain

120

150

= 10k

, V

OUT

= ±4V

OUT

Output Voltage Swing

(Note 2)

±4.7

±4.85
±4.95

--
--

= 10k

= 100k

CMVR

Common Mode Voltage Range

-4.3

+3.5

MRR

Common Mode Rejection Ratio

120

140

CMVR = -4.3V to +3.5V

PSRR

Power Supply

120

140

±3V to ±8V

Input Noise Voltage

--
--

0.2
0.7

1.5

P-P

= 100

, DC to 1Hz

DC to 10Hz

Input Noise Current

0.01

pA/

= 10Hz

GBW

Unity Gain Bandwidth

0.4

MHz

Slew Rate

sec C

= 50pF, R

= 10k

Overshoot

, V

Operating Supply Range

Note

Limiting input current to 100

A is recommended to avoid latch-up problems. Typically 1mA is safe however, this is not

guaranteed.

Output clamp not connected. See typical characteristics curves for output swing versus clamp current characteristics.

See "Output Clamp" under detailed description.

TC7652

DS21464B-page 6

2002 Microchip Technology Inc.

3.0

DETAILED DESCRIPTION

3.1

Capacitor Connection

Connect the null storage capacitors to the C

and C

pins with a common connection to the C

RET

pin (14-pin

TC7652) or to V

(8-pin TC7652). When connecting to

, avoid injecting load current IR drops into the

capacitive circuitry by making this connection directly
via a separate wire or PC trace.

3.2

Output Clamp

In chopper stabilized amplifiers, the output clamp pin
reduces overload recovery time. When a connection is
made to the inverting input pin (summing junction), a
current path is created between that point and the out-
put pin, just before the device output saturates. This
prevents uncontrolled differential input voltages and
charge build-up on correction storage capacitors. Out-
put swing is reduced.

3.3

Clock

The TC7652 has a 550Hz internal oscillator, which is
divided by two before clocking the input chopper
switches. The 275Hz chopping frequency is available
at INT CLK OUT (Pin 12) on 14-pin devices. In normal
operation, INT/EXT (Pin 14), which has an internal pull-
up, can be left open.

An external clock can also be used. To disable the
internal clock and use an external one, the INT/EXT pin
must be tied to V

. The external clock signal is then

applied to the EXT CLK IN input (Pin 13). An internal
divide-by-two provides a 50% switching duty cycle. The
capacitors are only charged when EXT CLK IN is high,
so a 50% to 80% positive duty cycle is recommended
for higher clock frequencies. The external clock can
swing between V

and V

, with the logic threshold

about 2.5V below V

The output of the internal oscillator, before the divide-
by-two circuit, is available at EXT CLK IN when INT/
EXT is high or unconnected. This output can serve as
the clock input for a second TC7652 (operating in a
master/slave mode), so that both op amps will clock at
the same frequency. This prevents clock intermodula-
tion effects when two TC7652's are used in a differen-
tial amplifier configuration.

FIGURE 3-1:

TEST CIRCUIT

If the TC7652's output saturates, error voltages on the
external capacitors will slow overload recovery. This
condition can be avoided if a strobe signal is available.
The strobe signal is applied to EXT CLK IN and the
overload signal is applied to the amplifier while the
strobe is LOW. In this case, neither capacitor will be
charged. The low leakage of the capacitor pins allow
long measurements to be made within eligible errors
(typical capacitor drift is 10

V/sec).

4.0

TYPICAL APPLICATIONS

4.1

Component Selection

and C

(external capacitors)should be in the 0.1

to 1

F range. For minimum clock ripple noise, use a

F capacitor in broad bandwidth circuits. For limited

bandwidth applications where clock ripple is filtered
out, use a 0.1

F capacitor for slightly lower offset volt-

age. High quality, film type capacitors (polyester or
polypropylene) are recommended, although a lower
grade ceramic may work in some applications. For
quickest settling after initial turn-on, use low dielectric
absorption

capacitors

(e.g.,

polypropylene).

With

ceramic capacitors, settling to 1

V takes several sec-

onds.

4.2

Static Protection

Although input diodes static protect all device pins,
avoid strong electrostatic fields and discharges that
can cause degraded diode junction characteristics and
produce increased input-leakage currents.

Output

0.1µF

TC7652

2002 Microchip Technology Inc.

DS21464B-page 7

TC7652

4.3

Output Stage/Load Driving

The output circuit is high impedance (about 18k

With lesser loads, the chopper amplifier behaves
somewhat like a transconductance amplifier with an
open-loop gain proportional to load resistance. (For
example, the open-loop gain is 17dB lower with a 1k

load than with a 10k

load.) If the amp is used only for

DC, the DC gain is typically greater than 120dB (even

with a 1k

load), and this lower gain is inconsequential.

For wide band, the best frequency response occurs
with a load resistor of at least 10k

. This produces a

6dB/octave response from 0.1Hz to 2MHz, with phase
shifts of less than 2 degrees in the transition region,
where the main amplifier takes over from the null ampli-
fier.

FIGURE 4-1:

CONNECTION OF INPUT GUARDS

4.4

Thermoelectric Effects

The thermoelectric (Seebeck) effects in thermocouple
junctions of dissimilar metals, alloys, silicon, etc. limit
ultra high precision DC amplifiers. Unless all junctions
are at the same temperature, thermoelectric voltages
around 0.1

C (up to tens of

C for some materi-

als) are generated. To realize the low offset voltages of
the chopper, avoid temperature gradients. Enclose
components to eliminate air movement, especially from
power dissipating elements in the system. Where pos-
sible, use low thermoelectric co-efficient connections.
Keep power supply voltages and power dissipation to a
minimum. Use high impedance loads and seek maxi-
mum separation from surrounding heat disipating ele-
ments.

4.5

Guarding

To benefit from TC7652 low input currents, take care
assembling printed circuit boards. Clean boards with
alcohol or TCE and blow dry with compressed air. To
prevent contamination, coat boards with epoxy or sili-
cone rubber.

Even if boards are cleaned and coated, leakage cur-
rents may occur because input pins are next to pins at
supply potentials. To reduce this leakage, use guarding
to lower the voltage difference between the inputs and
adjacent metal runs. The guard (a conductive ring sur-
rounding inputs) is connected to a low impedance point
at about the same voltage as inputs. The guard
absorbs leakage currents from high voltage pins.

The 14-pin dual-in-line arrangement simplifies guard-
ing. Like the LM108 pin configuration (but unlike the
101A and 741), pins next to inputs are not used.

Input

Output

Inverting Amplifier

Input

Output

Follower

Input

Output

Noninverting Amplifier

TC7652

DS21464B-page 8

2002 Microchip Technology Inc.

4.6

Pin Compatibility

Where possible, the 8-pin device pinout conforms to
such industry standards as the LM101 and LM741. Null
storing external capacitors connect to Pins 1 and 8,
which are usually for offset null or compensation capac-
itors. Output clamp (Pin 5) is similarly used. For OP05
and OP07 devices, replacement of the offset null
potentiometer (connected between Pins 1 and 8 and
V

by two capacitors from those pins to V

) provides

compatibility. Replacing the compensation capacitor
between Pins 1 and 8 by two capacitors to V

required. The same operation (with the removal of any
connection to Pin 5) works for LM101,

A748 and sim-

ilar parts.

Because NC pins provide guarding between input and
other pins, the 14-pin device pinout conforms closely to
the LM108. Because this device does not use any extra
pins and does not provide offset nulling (but requires a
compensation capacitor), some layout changes are
necessary to convert to the TC7652.

4.7

Some Applications

Figures 4-2 and 4-3 show basic inverting and nonin-
verting amplifier circuits using the output clamping cir-
cuit to enhance overload recovery performance. The
only limitations on replacing other op amps with the
TC7652 are supply voltage (±8V maximum) and output
drive capability (10k

load for full swing). Overcome

these limitations with a booster circuit (Figure 4-4) to
combine output capabilities of the LM741 (or other
standard device) with input capabilities of the TC7652.
These two form a composite device, therefore, when
adding the feedback network, the monitor loop gains
stability.

FIGURE 4-2:

NONINVERTING
AMPLIFIER WITH
OPTIONAL CLAMP

FIGURE 4-3:

INVERTING AMPLIFIER
WITH OPTIONAL CLAMP

FIGURE 4-4:

USING 741 TO BOOST
OUTPUT DRIVE
CAPABILITY

Figure 4-5 shows the clamp circuit of a zero offset com-
parator. Because the clamp circuit requires the invert-
ing input to follow the input signal, problems with a
chopper stabilized op amp are avoided. The threshold
input must tolerate the output clamp current

without disrupting other parts of the system.

Figure 4-6 shows how the TC7652 can offset null high
slew rate and wideband amplifiers.

Mixing the TC7652 with circuits operating at ±15V
requires a lower supply voltage divider with the TC7660
voltage converter circuit operated "backwards." Figure
4-7 shows an approximate connection.

FIGURE 4-5:

LOW OFFSET
COMPARATOR

TC7652

Output

Clamp

Input

0.1µF

Output

Input

Clamp

0.1µF

TC7652

+15V

-15V

-7.5V

0.1

µF

Out

-7.5V

0.1
µF

10k

TC7652

741

TC7652

OUT

Clamp

0.1µF

200k

to 2m

TC7652

DS21464B-page 10

2002 Microchip Technology Inc.

5.0

TYPICAL CHARACTERISTICS

Note:

The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

± SUPPLY VOLTAGE (V)

1400

1200

1000

800

600

400

200

SUPPLY CURRENT (µA)

Supply Current

vs ± Supply Voltage

OUTPUT VOLTAGE (V)

4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0

1 mA

0.1mA

0.01mA

1µA

0.1µA

0.01µA

1nA

0.1nA

0.01nA

1pA

CLAMP CURRENT

Positive Clamp Current

SOURCE

SINK

Output Resistance

vs Output Voltage

100

OUTPUT RESISTANCE (W)

-3.0

OUTPUT VOLTAGE (V)

10k

100k

-5.0

-4.0

1 sec/DIV

2 µV/DIV

Noise at 0.1Hz to 10Hz

OUTPUT VOLTAGE (V)

4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0

1mA

0.1mA

0.01mA

1µA

0.1µA

0.01µA

1nA

0.1nA

0.01nA

1pA

CLAMP CURRENT

Negative Clamp Current

1 sec/DIV

1 µV/DIV

Noise at 0.1Hz to 100Hz

1 sec/DIV

1 µV/DIV

Noise at 0.1Hz to 1Hz

100

10k

100k

FREQUENCY (Hz)

GAIN

-20

-10

GAIN (dB)

Phase Gain (Bode Plot)*

*NOTE:

±5V, ±2.5V supplies; no load to 10k load.

-180

-120

-60

+60

+120

+180

+240

PHASE

(
de

5 µsec/DIV

0.5V/DIV

Slew Rate

PHASE

TC7652

DS21464B-page 12

2002 Microchip Technology Inc.

6.0

PACKAGING INFORMATION

6.1

Package Marking Information

Package marking information not available at this time.

6.2

Package Dimensions

MIN.

PIN 1

.260 (6.60)
.240 (6.10)

.045 (1.14)
.030 (0.76)

.070 (1.78)
.040 (1.02)

.400 (10.16)

.348 (8.84)

.200 (5.08)
.140 (3.56)

.150 (3.81)
.115 (2.92)

.110 (2.79)
.090 (2.29)

.022 (0.56)
.015 (0.38)

.040 (1.02)
.020 (0.51)

.015 (0.38)
.008 (0.20)

.310 (7.87)
.290 (7.37)

.400 (10.16)

.310 (7.87)

8-Pin Plastic DIP

Dimensions: inches (mm)

.260 (6.60)
.240 (6.10)

.770 (19.56)
.745 (18.92)

.310 (7.87)
.290 (7.37)

.040 (1.02)
.020 (0.51)

.070 (1.78)
.045 (1.14)

.022 (0.56)
.015 (0.38)

.110 (2.79)
.090 (2.29)

.200 (5.08)
.140 (3.56)

.150 (3.81)
.115 (2.92)

PIN 1

14-Pin PDIP (Narrow)

.015 (0.38)
.008 (0.20)

MIN.

.400 (10.16)

.310 (7.87)

Dimensions: inches (mm)

2002 Microchip Technology Inc.

DS21464B - page 15

Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip's products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.

Trademarks

The Microchip name and logo, the Microchip logo, FilterLab,
K

, microID,

MPLAB, PIC, PICmicro, PICMASTER,

PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.

dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.

Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their
respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company's quality system processes and
procedures are QS-9000 compliant for its
PICmicro

8-bit MCUs, K

code hopping

devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip's quality system for the
design and manufacture of development
systems is ISO 9001 certified.

DS21464B-page 16

2002 Microchip Technology Inc.

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03/01/02

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