IVC102 Datasheet, PDF (1/15 Pages) Burr-Brown (TI) – PRECISION SWITCHED INTEGRATOR TRANSIMPEDANCE AMPLIFIER

®
IVC102
SBFS009
PRECISION SWITCHED INTEGRATOR
TRANSIMPEDANCE AMPLIFIER
APPLICATIONS
q PRECISION LOW CURRENT MEASUREMENT
q PHOTODIODE MEASUREMENTS
q IONIZATION CHAMBER MEASUREMENTS
q CURRENT/CHARGE-OUTPUT SENSORS
q LEAKAGE CURRENT MEASUREMENT
FEATURES
q ON-CHIP INTEGRATING CAPACITORS
q GAIN PROGRAMMED BY TIMING
q LOW INPUT BIAS CURRENT: 750fA max
q LOW NOISE
q LOW SWITCH CHARGE INJECTION
q FAST PULSE INTEGRATION
q LOW NONLINEARITY: 0.005% typ
q 14-PIN DIP, SO-14 SURFACE MOUNT
DESCRIPTION
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.
The IVC102 is ideal for amplifying low-level sensor
currents from photodiodes and ionization chambers.
The input signal current can be positive or negative.
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.
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.
Ionization
Chamber
6
C₃ 60pF
V_B
5
C₂ 30pF
4 C₁ 10pF
3
S₂
I_IN
2
S₁
1
Photodiode
Analog
Ground
11
12
S₁
S₂
Logic Low closes switches
V+
14
10
V_O
9
13
V–
Digital
Ground
∫ ^V
O⁼
–1
C_INT
I_IN(t) dt
Positive or Negative
Signal Integration
0V
Hold Integrate Hold
S₁
S₂
Reset
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: [phone] • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
®
© 1996 Burr-Brown Corporation
PDS-¹1329A
IVC102 Printed in U.S.A. June, 1996