Microchip Technology TC7652CPD, TC7652CPA Datasheet
y
TC7652
Low Noise, Chopper Stabilized Operational Amplifier
Features
• Low Offset Over Temperature Range: 10µV
• Ultra Low Long Term Drift: 150nV/Month
• Low Temperature Drift: 100nV/
°C
• Low DC Input Bias Current: 15pA
• High Gain, CMRR and PSRR: 110dB Min
• Low Input Noise Voltage: 0.2µV
p-p (DC to 1Hz)
• InternallyCompensated for Unity G ain Operation
• Clamp Circuit for Fast Overload Recovery
Applications
• Instrumentation
• Medical Instrumentation
• Embedded Control
• TemperatureSensor Amplifier
• Strain Gage Amplifier
Device Selection Table
Part Number Package
TC7652CPA 8-Pin Plastic DIP 0°C to +70°C
TC7652CPD 14-Pin Plastic DIP 0°C to +70°C
Temperature
Range
General Description
The TC7652 i s 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 problems from external trim components).LiketheTC7650,
the TC7652 requires only two noncritical external caps
for storing the chopped null potentials. There are no
significant chopping spikes, internal effects or overrange lockup problems.
Package Type
8-Pin DIP
C
1
A
-Input
2
TC7652CPA
3
+Input
4
V
SS
14-Pin DIP
C
B
1
C
A
2
NC
3
TC7652CPD
-Input
4
5
+Input
6
NC
7
V
SS
NC = No Internal Connection
(Ma
2002 Microchip TechnologyInc. DS21464B-page 1
Be Used As Input Guard)
8
7
6
5
14
13
12
11
10
9
8
C
B
V
DD
Output
Output
Clamp
INT/EXT
EXT CLK
In
INT CLK
Out
V
DD
Output
Output
Clamp
C
RETN
TC7652
S
Functional Block Diagram
Output Clamp
(Not On "Z" Pinout)
Inputs
A
Output Clamp
Circuit
Main
Amplifier
NULL
Intermod
Comparator
BB
NULL
Amplifier
Oscillator
BA
BA
TC7652
14-Pin DIP Only
INT/EXT
EXT CLK IN
CLK OUT
C
B
C
A
Output
NULL
NOTE 1: For 8-pin DIP connect to VSS, or to C
on "Z" pinout.
RET
C
RETN
(1)
V
S
DS21464B-page 2
2002 Microchip TechnologyInc.
TC7652
1.0 ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS*
Total Supply Voltage (VDDto VSS) .......................+18V
Input Voltage.................... (V
Voltage on Oscillator Control Pins...............V
+0.3V)to (VSS–0.3V)
DD
DD
to V
SS
*Stresses above those listed under “Absolute M aximum
Ratings” may cause permanent damage to the dev ice.
These are stress ratings only and functional oper ation of the
device at these or any other conditions above those indicated in the operation sections of the specifications is not
implied. Exposure to Absolute Max imum Rating conditions
for ex tended periods my affect device reliability.
Duration of Output Short Circuit.....................Indefinite
Current Into Any Pin............................................10mA
WhileOperating(Note 1)............................100µA
Package Power Dissipation (T
< 70°C)
A
8-Pin Plastic DIP.......................................730mW
14-Pin Plastic DIP..................................... 800mW
StorageTemperature Range..............-65°C to +150°C
Operating Temperature Range
C Device .......................................... 0°C to +70°C
I Device.........................................-25°C to +85°C
TC7652 ELECTR ICAL SPECI FICATIONS
Electrical Characteristics: VDD=+5V,VSS=-5V,TA= +25°C, unless otherwise indicated.
Symbol Parameter Min Typ Max Units Test Conditions
V
OS
TCV
OS
/DT Offset Voltage vs Time — 150 — nV/mo
V
OS
I
BIAS
I
BIAS
I
OS
R
IN
OL LargeSignal Voltage Gain 120 150 — dB R
V
OUT
CMVR Common Mode Voltage Range -4.3 — +3.5 V
MRR Common Mode Rejection Ratio 120 140 — dB CMVR = -4.3V to +3.5V
PSRR Power Supply 120 140 — dB ±3Vto ±8V
e
N
I
N
GBW Unity Gain Bandwidth — 0.4 — MHz
SR Slew Rate — 1 — V/µsec C
V
DD,VSS
Note 1: Limiting input current to 100µA is recommended to avoid latch-up problems. Typically 1mA is safe however,thisis not
Input Offset Voltage — ±2 ±5 µVTA=+25°C
Average Temperature Co-efficient of
Input Offset Voltage
Input Bias Current (CLK On) —
Input Bias Current (CLK Off) —
Input Offset Current — 25 150 pA
Input Resistance — 10
Output Voltage Swing (Note 2)±4.7—±4.85
InputNoiseVoltage —
InputNoiseCurrent — 0.01 — pA/
Overshoot — 15 — %
Operating SupplyRange 5 — 16 V
guaranteed.
2: Output clamp not connected. See typical characteristics curves for output swing versus clamp current characteristics.
3: See “OutputClamp” under detailed description.
—0.010.05µV/°C 0°C < TA<+70°C
30
—
—
—
—
—
100
250
15
35
100
12
±4.95
0.2
0.7
100
—
1000
30
—
1000
— Ω
—
—
1.5
5
pA TA=+25°C
0°C < T
-25°C < T
pA T
VRL=10kΩ
µV
P-P
µV
P-P
√Hz
=+25°C
A
0°C < T
-25°C < T
=10kΩ,V
L
R
= 100kΩ
L
RS=100Ω,DCto1Hz
DC to 10Hz
f =10Hz
= 50pF, RL=10kΩ
L
<+70°C
A
<+85°C
A
<+70°C
A
<+85°C
A
OUT
=±4V
2002 Microchip TechnologyInc. DS21464B-page 3
TC7652
TC7652 ELECTR ICAL SPECI FICATIONS (CONTINUED)
Electrical Characteristics: VDD=+5V,VSS=-5V,TA= +25°C, unless otherwise indicated.
Symbol Parameter Min Typ Max Units Test Conditions
I
S
f
CH
Note 1: Limiting input current to 100µA is recommended to avoid latch-up problems. Typically 1mA is safe however,thisis not
SupplyCurrent — 1 3 mA NoLoad
Internal ChoppingFrequency 100 275 — Hz Pins 12 – 14 Open (DIP)
ClampON Current(Note 3)25100—µAR
Clamp OFF Current (Note3)—1—pA-4V≤ V
guaranteed.
2: Output clamp not connected. See typical characteristics curves for output swing versus clamp current characteristics.
3: See “OutputClamp” under detailed description.
= 100kΩ
L
OUT
<+10V
DS21464B-page 4
2002 Microchip TechnologyInc.
2.0 PIN DESCRIPTIONS
ThedescriptionsofthepinsarelistedinTable2-1.
TABLE 2-1: PIN FUNCTION TABLE
TC7652
Pin Number
8-pin DIP 14-pin DIP
1,8 2,1 C
2 4 -INPUT Inverting Input
3 5 +INPUT Non-inverting Input
47 V
59OUTPUT
6 10 OUTPUT Output
711 V
— 3,6 NC No internal connection
—8C
— 12 INT CLK OUT Internal Clock Output
— 13 EXT CLK IN External Clock Input
— 14 INT/EXT
Symbol Description
A,CB
SS
CLAMP
DD
RETN
Nulling capacitor pins
Negative Power Supply
Output VoltageClamp
Positive Power Supply
Capacitor current return pin
Select Internal or External Clock
2002 Microchip TechnologyInc. DS21464B-page 5
Loading...