1
TC7652
LOW NOISE, CHOPPER-STABILIZED OPERATIONAL AMPLIFIER
FEATURES
s
s
s
s
s
s
s
s
Low Offset Over Temperature Range ............ 10
碌
V
Ultra-Low Long-Term Drift ................. 150nV/Month
Low Temperature Drift ............................. 100nV/
擄
C
Low DC Input Bias Current ............................. 15pA
High Gain, CMRR and PSRR ................. 110dB Min
Low Input Noise Voltage ......... 0.2
碌
V
P-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 band-
width) 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 exter-
nal trim components. Like the TC7650, the TC7652 re-
quires 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
鈥揑NPUT 4
+INPUT 5
NC 6
V
SS
7
TC7652CPD
14 INT/EXT
EXT CLK
13 IN
12 INT CLK
OUT
11 V
DD
10 OUTPUT
9
8
OUTPUT
CLAMP
CRET
CA 1
鈥揑NPUT 2
+INPUT 3
V
SS
4
TC7652CPA
8 CB
7
V
DD
ORDERING INFORMATION
Part No.
TC7652CPA
TC7652CPD
Package
8-Pin Plastic DIP
14-Pin Plastic DIP
Temperature
Range
0擄C to +70擄C
0擄C to +70擄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
C
EXT
OUTPUT
INTERMOD
COMPARATOR
B
B
NULL
AMPLIFIER
A
NULL
NOTE:
1. For 8-pin DIP connect to V
SS
, or to C
RET
on "Z" pinout.
TC7652-7 9/11/96
B
A
C
EXT
C
RET
(NOTE 1)
V
SS
8
3-281
TELCOM SEMICONDUCTOR, INC.