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ACF2101BP Datasheet

  • ACF2101BP

  • Low Noise, Dual SWITCHED INTEGRATOR

  • 14頁

  • BB

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廬
FPO
ACF2101
Low Noise, Dual
SWITCHED INTEGRATOR
FEATURES
q
INCLUDES INTEGRATION CAPACITOR,
RESET AND HOLD SWITCHES, AND
OUTPUT MULTIPLEXER
q
LOW NOISE: 10碌Vrms
q
LOW CHARGE TRANSFER: 0.1pC
q
WIDE DYNAMIC RANGE: 120dB
q
LOW BIAS CURRENT: 100fA
APPLICATIONS
q
CURRENT TO VOLTAGE CONVERSION
q
PHOTODIODE INTEGRATOR
q
CURRENT MEASUREMENT
q
CHARGE MEASUREMENT
q
CT SCANNER FRONT END
q
MEDICAL, SCIENTIFIC, AND INDUSTRIAL
INSTRUMENTATION
DESCRIPTION
The ACF2101 is a dual switched integrator for preci-
sion applications. Each channel can convert an input
current to an output voltage by integration, using either
an internal or external capacitor. Included on the chip
are precision 100pF integration capacitors, hold and
reset switches, and output multiplexers.
As a complete circuit on a single chip, the ACF2101
eliminates many of the problems commonly encoun-
tered in discrete designs, such as leakage current errors
and noise pickup. The integrating approach can pro-
vide lower noise than conventional transimpedance
amplifier designs and also eliminates the need for high
performance, high value feedback resistors.
The extremely low bias current and low noise of the
ACF2101鈥檚
Difet
廬
amplifiers, along with active la-
ser trimming of both offset and drift, assure precision
current to voltage conversion.
Although designed for +5V, 鈥?5V supplies, the
ACF2101 can be operated on supplies up to
鹵18VDC.
It is available in both 24-pin plastic DIP and SOIC
packages.
Difet
廬
Burr-Brown Corp.
A
Cap A
In A
Reset
B
A
Hold
B
A
C
INTERNAL
100pF
Reset
Select
B
Out A
A
Select
Sw Out A
Sw In A
Hold
Com A
C
INTERNAL
Cap B
In B
Reset
Sw In B
Hold
100pF
Sw Com A
Out B
B
Select
Sw Out B
Com B
A
V+
B
V鈥?/div>
Sw Com B
Gnd
International Airport Industrial Park 鈥?Mailing Address: PO Box 11400, Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 鈥?Tel: (520) 746-1111 鈥?Twx: 910-952-1111
Internet: http://www.burr-brown.com/ 鈥?FAXLine: (800) 548-6133 (US/Canada Only) 鈥?Cable: BBRCORP 鈥?Telex: 066-6491 鈥?FAX: (520) 889-1510 鈥?Immediate Product Info: (800) 548-6132
漏 1990 Burr-Brown Corporation
PDS-1078D
Printed in U.S.A. September, 1994

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