CLC431 datasheet(6/8 Pages) NSC

6 / 8 page

The optional 1k

Ω pull-down resistor connected from the

output of the 2:1 mux to the negative power supply (-VCC)

results in improved differential gain and phase perfor-

mance (0.02% and 0.01°) at PAL video levels.

Switched Gain Amplifier (CLC431)

As seen from the front page, the CLC431 can also be

configured as a switched-gain amplifier that is similar to

the 2:1 mux. Configuring each of the two CLC431's

amplifiers with different non-inverting gains and tying the

two inputs together (eliminating one of the input-terminat-

ing resistors) allows the CLC431 to switch an input signal

between two different gains.

Inactive Channel Impedances (CLC431)

The impedance that is seen when looking into the output

of a disabled CLC431 is typically represented as

Ω||16pF. The inverting input impedance becomes

very high, essentially open. Therefore, the impedance

presented by a disabled channel is (Rf+Rg)||

(Ri+(1M

Ω||16pF)) as illustrated in Fig. 4. It should also be

noted that any trace capacitance that is associated with

the common output connection will add in parallel to that

presented by the CLC431's inactive channel.

Ordering Information

Model

Temperature Range

Description

CLC431AJP

-40°C to +85°C

14-pin PDIP

CLC431AJE

-40°C to +85°C

14-pin SOIC

CLC431ALC

-40°C to +85°C

dice

CLC431A8B

-55°C to +125°C

14-pin CerDIP, MIL-STD-883

CLC431AMC

-55°C to +125°C

dice, MIL-STD-883

CLC432AJP

-40°C to +85°C

8-pin PDIP

CLC432AJE

-40°C to +85°C

8-pin SOIC

CLC432ALC

-40°C to +85°C

dice

CLC432A8B

-55°C to +125°C

8-pin CerDIP, MIL-STD-883

CLC432AMC

-55°C to +125°C

dice, MIL-STD-883

DESC SMD numbers: 5962-94725.

Channel 1

Channel 2

Vout

SELECT

Ω

Optional

-15V

Ω

634

Ω

634

Ω

634

Ω

634

Ω

½CLC431

Fig. 3

Twisted-Pair Driver.

Twisted-pair cables are used in many applications such

as telephony, video and data communications. The

CLC432's two matched channels make it well suited for

such applications and is illustrated in Fig. 5.

CCD Amplifier.

The CLC432 can easily be configured as 10MSPS CCD

amplifier with DC level shifting as illustrated in Fig 6.

Notice that one of the CLC432's channels buffers the

CCD output while the other channel is configured with

both an inverting DC gain and an AC gain in order to

achieve the overall transfer function shown in Fig. 6.

½Ro

½R

½CLC432

Vin

Fig. 5

0.1

µF

Ω

Vref

½CLC432

Vout

Vin

ref

out

−

Fig. 6

16pF

Impedance

Presented

Disabled

CLC431

Impedance

Presented

Inactive

Channel

Ω

Active

Channel

Vout

Vin

Fig. 4

for R

out













http://www.national.com

CLC431 Datasheet(PDF) 6 Page - National Semiconductor (TI)

CLC431 Datasheet(HTML) 6 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8

Datasheet Download

Link URL