®
IVC102
PRECISION SWITCHED INTEGRATOR
TRANSIMPEDANCE AMPLIFIER
DESCRIPTION
APPLICATIONS
The IVC102 is a precision integrating amplifier with
FET op amp, integrating capacitors, and low leakage
FET switches. It integrates low-level input current for
a user-determined period, storing the resulting voltage
on the integrating capacitor. The output voltage can be
held for accurate measurement. The IVC102 provides
a precision, lower noise alternative to conventional
transimpedance op amp circuits that require a very
high value feedback resistor.
● PRECISION LOW CURRENT MEASUREMENT
● PHOTODIODE MEASUREMENTS
● IONIZATION CHAMBER MEASUREMENTS
● CURRENT/CHARGE-OUTPUT SENSORS
● LEAKAGE CURRENT MEASUREMENT
FEATURES
● ON-CHIP INTEGRATING CAPACITORS
The IVC102 is ideal for amplifying low-level sensor
currents from photodiodes and ionization chambers.
The input signal current can be positive or negative.
● GAIN PROGRAMMED BY TIMING
● LOW INPUT BIAS CURRENT: 750fA max
● LOW NOISE
TTL/CMOS-compatible timing inputs control the inte-
gration period, hold and reset functions to set the
effective transimpedance gain and to reset (discharge)
the integrator capacitor.
● LOW SWITCH CHARGE INJECTION
● FAST PULSE INTEGRATION
Package options include 14-Pin plastic DIP and SO-14
surface-mount packages. Both are specified for the
–40°C to 85°C industrial temperature range.
● LOW NONLINEARITY: 0.005% typ
● 14-PIN DIP, SO-14 SURFACE MOUNT
V+
14
–1
C3
30pF
60pF
6
5
4
VO
=
CINT
IIN(t) dt
∫
VB
C2
10pF
Positive or Negative
Signal Integration
C1
Ionization
Chamber
S2
3
2
10
9
0V
IIN
VO
S1
Hold
Integrate
Hold
Reset
1
S1
S2
Photodiode
11
12
13
Analog
Ground
V–
Digital
Ground
S1
S2
Logic Low closes switches
InternationalAirportIndustrialPark • MailingAddress:POBox11400 • Tucson,AZ85734 • StreetAddress:6730S.TucsonBlvd. • Tucson,AZ85706
Tel:(520)746-1111 • Twx:910-952-1111 • Cable:BBRCORP • Telex:066-6491 • FAX:(520)889-1510 • ImmediateProductInfo:(800)548-6132
®
PDS-11329A
© 1996 Burr-Brown Corporation
I
P
V
rin
C
ted
1
in U.S.A. June, 1996
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2
SBFS009