Datasheet > LSP2961

LSP2961

更新时间： 2024-10-17 22:30:59

品牌	Logo	应用领域
杰尔 - AGERE		放大器光电二极管
页数	文件大小	规格书
6页	143K
描述
Precision Log Ratio Amplifier

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LSP2961 数据手册

Advance Data Sheet

September 2001

LSP2961

Precision Log Ratio Amplifier

decade (1 nA to 1 mA) minimum, with seven-decade

(1 nA to 10 mA) and eight-decade (100 pA to 10 mA)

operation available with increased conformity error.

The amplifier has an internal trimmed reference 1 µA

5% current source that is also externally adjustable

using an external resistor. The output offset voltage

is 100 mV maximum and can be nulled using an

external potentiometer.

Features

^ISeven decades (1 nA to 10 mA) typical input range

^IInternal scale factor K = 1 ± 2% (K externally

adjustable):

IREF

(eq. 1)

OUTPUT = K × log-------------

IIN

The input current is applied to the IN pin and the

corresponding output is taken from the OUTPUT pin.

For a 1 V/decade application in a stable temperature

environment, no external components are required to

obtain the specified performance. For an application

that a scale factor other than 1 V/decade is required,

an external resistor connecting the SCALE FACTOR

pin to either the OUTPUT pin or GND will result in

less or more than 1 V/decade for the scale factor.

The amplifier’s output can range from (VCC – 1 V) to

(VEE + 1 V). This is ideal for the control in optical

density measurements, and in other situations such

as precision logarithm calculations. Each amplifier

has an internally trimmed reference current of 1 µA.

This reference current can be changed using an

external resistor connecting to the IREF_ADJ pin, and

either VCC or GND, depending on the need to

increase or decrease the reference current.

^IInternal trimmed reference current

(IREF = 1 µA ± 5%, externally adjustable)

^IMaximum ±100 mV output offset (externally

adjustable)

^IMinimal external components

^I±5 V power supply

^ITSSOP small package

Applications

^IOptical light density measurement

^ILog, log ratio computation

^IData linearization

Additionally, the maximum output offset voltage is

±100 mV. This can be nulled using an external

potentiometer connected between the ±5 V supplies

and the wiper connected to the VOS_ADJ pin. The

internal block diagram is shown in Figure 1.

Description

The LSP2961 is a single-channel precision logarithm

and log ratio integrated circuit powered by +5 V and

–5 V power supplies. The voltage output of the

amplifier is a logarithmic function of the ratio of a

reference current (IREF) over the input current (IIN).

The scale factor is set internally to 1 V/decade, and

is further adjustable by adding an external resistor.

The input dynamic range for the amplifier is a six-

The LSP2961 is available in a 3 mm x 3 mm TSSOP

package. The 8-pin LSP2961 requires one negative

5 V power supply (VEE) and one positive 5 V power

supply (VCC). Refer to Table 1 for detailed pin

information. Figure 3 references the external pin

connections.

12 3 4 5 6

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