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TC7652 LOW NOISE, CHOPPER-STABILIZED OPERATIONAL AMPLIFIER
FEATURES
s s s s s s s s 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 ......... 0.2µVP-P; DC to 1Hz Internally-Compensated for Unity-Gain Operation Clamp Circuit for Fast Overload Recovery
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 problems 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 overrange lockup problems.
2 3 4 5
PIN CONFIGURATIONS
CB 1 CA 2 NC 3 –INPUT 4 +INPUT 5 NC 6 VSS 7 TC7652CPD 14 INT/EXT EXT CLK 13 IN 12 INT CLK OUT 11 VDD 10 OUTPUT 9 8 OUTPUT CLAMP CRET CA 1 –INPUT 2 +INPUT 3 VSS 4 TC7652CPA 8 CB 7 VDD
ORDERING INFORMATION
Part No. TC7652CPA TC7652CPD Package 8-Pin Plastic DIP 14-Pin Plastic DIP Temperature Range 0°C to +70°C 0°C to +70°C
6 OUTPUT 5 CLAMP
NC = NO INTERNAL CONNECTION (MAY BE USED AS INPUT GUARD)
FUNCTIONAL BLOCK DIAGRAM
TC7652
14-PIN DIP ONLY OUTPUT CLAMP (NOT ON "Z" PINOUT) OUTPUT CLAMP CIRCUIT OSCILLATOR INT/EXT EXT CLK IN CLK OUT
6 7
MAIN AMPLIFIER INPUTS NULL A B CEXT OUTPUT
INTERMOD COMPARATOR B B NULL AMPLIFIER A NULL NOTE: 1. For 8-pin DIP connect to VSS, or to CRET on "Z" pinout.
TC7652-7 9/11/96
B
A
C
EXT
CRET (NOTE 1) VSS
8
3-281
TELCOM SEMICONDUCTOR, INC.
LOW NOISE, CHOPPER-STABILIZED OPERATIONAL AMPLIFIER TC7652
ABSOLUTE MAXIMUM RATINGS*
Total Supply Voltage (VDD to VSS) ........................... +18V Input Voltage ........................ (VDD + 0.3V) to (VSS – 0.3V) Voltage on Oscillator Control Pins ................... VDD to VSS Duration of Output Short Circuit ......................... Indefinite Current Into Any Pin ................................................. 10mA While Operating (Note 1) ..................................100µA Package Power Dissipation (TA ≤ 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 Lead Temperature (Soldering, 10 sec) ................. +300°C
*Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. 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 indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS: VDD = +5V, VSS = – 5V, TA = +25°C, unless otherwise indicated.
Symbol
VOS TCVOS VOS/DT IBIAS
Parameter
Input Offset Voltage Average Temperature Coefficient of Input Offset Voltage Offset Voltage vs Time Input Bias Current (CLK On) Input Bias Current (CLK Off) Input Offset Current Input Resistance Large Signal Voltage Gain Output Voltage Swing (Note 2) Common-Mode Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Input Noise Voltage Input Noise Current Unity-Gain Bandwidth Slew Rate Overshoot Operating Supply Range Supply Current Internal Chopping Frequency Clamp ON Current (Note 3) Clamp OFF Current (Note 3)
Test Conditions
TA = +25°C 0°C < TA < +70°C 0°C < TA < +70°C
Min
— — — — — — — — — — — — 120 ±4.7 — – 4.3 120 120 — — — — — — 5 — 100 25 —
Typ
±2 ±10 0.01 150 30 100 250 15 35 100 25 1012 150 ±4.85 ±4.95 — 140 140 0.2 0.7 0.01 0.4 1 15 — 1 275 100 1
Max
±5 — 0.05 — 100 — 1000 30 — — 150 — — — — +3.5 — — 1.5 5 — — — — 16 3 — — —
Unit
µV µV/°C nV/mo pA
IBIAS
TA = +25°C 0°C < TA < +70°C – 25°C < TA < +85°C TA = +25°C 0°C < TA < +70°C – 25°C < TA < +85°C
pA
IOS RIN
OL
VOUT CMVR MRR PSRR eN IN GBW SR VDD, VSS IS fCH
RL = 10kW, VOUT = ±4V RL = 10kW RL = 100kW
pA W dB V V dB dB µVP-P µVP-P pA/√Hz MHz V/µsec % V mA Hz µA pA
CMVR = – 4.3V to +3.5V ±3V to ±8V RS = 100W, DC to 1Hz DC to 10Hz f = 10Hz CL = 50 pF, RL = 10kW
No Load Pins 12 – 14 Open (DIP) RL = 100kW – 4V ≤ VOUT < +10V
NOTES: 1. Limiting input current to 100µA is recommended to avoid latch-up problems. Typically, 1mA is safe; however, this is not guaranteed. 2. Output clamp not connected. Se.