TC7650 Datasheet, PDF (1/7 Pages) TelCom Semiconductor, Inc – CHOPPER-STABILIZED OPERATIONAL AMPLIFIER

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TC7650
CHOPPER-STABILIZED OPERATIONAL AMPLIFIER
FEATURES
GENERAL DESCRIPTION
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s Low Input Offset Voltage ......................... 0.7µV Typ
s Low Input Offset Voltage Drift ......... 0.05µV/°C Max
s Low Input Bias Current ............................ 10pA Max
s High Impedance Differential CMOS Inputs .... 10¹²â„¦
s High Open-Loop Voltage Gain ................ 120dB Min
s Low Input Noise Voltage ............................ 2.0µVp-p
s High Slew Rate .......................................... 2.5V/µsec
s Low-Power Operation ..................................... 20mW
s Output Clamp Speeds Recovery Time
s Compensated Internally for Stable Unity Gain
Operation
s Direct Replacement for ICL7650
s Available in 8-Pin Dip and 14-Pin Dip
ORDERING INFORMATION
Part No.
TC7650CPA
TC7650CPD
Package
8-Pin Plastic DIP
14-Pin Plastic DIP
Temperature
Range
0°C to +70°C
0°C to +70°C
Max
V_OS
5µV
5µV
The TC7650 CMOS chopper-stabilized operational
amplifier practically removes offset voltage error terms
from system error calculations. The 5µV maximum V_OS
specification, for example, represents a 15 times improve-
ment over the industry-standard OP07E. The 50nV/°C off-
3 ^{set drift specification is over 25 times lower than the OP07E.}
The increased performance eliminates V_OS trim proce-
dures, periodic potentiometer adjustment and the reliability
problems caused by damaged trimmers.
The TC7650 performance advantages are achieved
without the additional manufacturing complexity and cost
incurred with laser or "zener zap" V_OS trim techniques.
The TC7650 nulling scheme corrects both DC V_OS
4 ^{errors and VOS drift errors with temperature. A nulling}
amplifier alternately corrects its own V_OS errors and the main
amplifier V_OS error. Offset nulling voltages are stored on two
user-supplied external capacitors. The capacitors connect
to the internal amplifier V_OS null points. The main amplifier
input signal is never switched. Switching spikes are not
present at the TC7650 output.
The 14-pin dual-in-line package (DIP has an external
oscillator input to drive the nulling circuitry for optimum noise
performance. Both the 8 and 14-pin DIPs have an output
voltage clamp circuit to minimize overload recovery time.
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FUNCTIONAL BLOCK DIAGRAM
OUTPUT
CLAMP
INPUTS
OUTPUT CLAMP
CIRCUIT
MAIN
AMPLIFIER
NULL
B
A
INTERMOD
COMPENSATION
B
NULL
AMPLIFIER
NULL
* FOR 8-PIN DIP, CONNECT TO VSS.
OSCILLATOR
14-PIN DIP ONLY
INT/EXT
EXT CLK IN
CLK OUT
A
B
CEXT
OUTPUT
B
A
CEXT
TC7650
*CRET
TELCOM SEMICONDUCTOR, INC.
PIN CONFIGURATIONS
8-Pin DIP
C_A 1
(–) INPUT 2
(+) INPUT 3
V_{SS 4}
TC7650CPA
8 C_B
7 V_DD
6 OUTPUT
5 CLAMP
6
14-Pin DIP
C_{B 1}
C_{A 2}
NC
(GUARD)
3
(–) INPUT 4
(+) INPUT ₅
NC
(GUARD)
6
V_{SS 7}
TC7650CPD
14 INT/EXT
13
EXT CLK
INPUT
12
INT CLK
OUTPUT
11 V_DD
10 OUTPUT
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OUTPUT
CLAMP
8 C_RETN
NC = NO INTERNAL CONNECTION
TC7650-5 9/11/96
3-273
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