MAX4103ESA 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4103ESA

250MHz, Broadcast-Quality, Low-Power Video Op Amps

Maxim Integrated 

250MHz, Broadcast-Quality, Low-Power

Video Op Amps

_____________________Pin Description

PIN

NAME

FUNCTION

1

N.C.

Not internally connected

2

IN-

Inverting Input

3

IN+

Noninverting Input

4

VEE

Negative Power Supply. Connect

to -5V

5

N.C.

Not internally connected

6

OUT

Amplifier Output

7

VCC

Positive Power Supply. Connect

to +5V

8

N.C.

Not internally connected

_______________Detailed Description

The MAX4102/MAX4103 low-power, high-speed op

amps feature ultra-low differential gain and phase, and

are optimized for the highest quality video applications.

Differential gain and phase errors are 0.002%/0.002°

for the MAX4102 and 0.008%/0.003° for the MAX4103.

The MAX4102 also features a -3dB bandwidth of over

250MHz and 0.1dB gain-flatness of 130MHz. The

MAX4103 features a -3dB bandwidth of 180MHz and a

0.1dB bandwidth of 80MHz.

The MAX4102 is unity-gain stable, and the MAX4103 is

optimized for closed-loop gains of 2V/V (6dB) and higher.

Both devices drive back-terminated 50Ω or 75Ω cables to

±3.1V (min) and deliver an output current of 80mA.

Available in a small 8-pin SO package, the MAX4102/

MAX4103 are ideal for high-definition TV systems (in

RGB, broadcast, or consumer video applications) that

benefit from low power consumption and superior dif-

ferential gain and phase characteristics.

__________Applications Information

Grounding, Bypassing,

and PC Board Layout

In order to achieve the full bandwidth, Microstrip and

Stripline techniques are recommended in most cases.

To ensure your PC board does not degrade the amp’s

performance, it’s wise to design the board for a fre-

quency greater than 1GHz. Even with very short runs,

it’s good practice to use this technique at critical

points, such as inputs and outputs. Whether you use a

constant-impedance board or not, observe the follow-

ing guidelines when designing the board:

• Do not use wire-wrap boards, because they are too

inductive.

• Do not use IC sockets. They increase parasitic

capacitance and inductance.

• In general, surface-mount components have shorter

leads and lower parasitic reactance, and give better

high-frequency performance than through-hole com-

ponents.

• The PC board should have at least two layers, with

one side a signal layer and the other a ground plane.

• Keep signal lines as short and as straight as possi-

ble. Do not make 90° turns; round all corners.

• The ground plane should be as free from voids as

possible.

On Maxim’s evaluation kit, the ground plane has been

removed from areas where keeping the trace capaci-

tance to a minimum is more important than maintaining

ground continuity. For example, the ground plane has

been removed from beneath the IC to minimize pin

capacitance.

The bypass capacitors should include a 0.1µF at each

supply pin and the ground plane, located as close to the

package as possible. Then place a 10µF to 15µF low-

ESR tantalum at the point of entry (to the PC board) of

the power-supply pins. The power-supply trace should

lead directly from the tantalum capacitor to the VCC and

VEE pins to maintain the low differential gain and phase

of these devices.

Setting Gain

The MAX4102/MAX4103 are voltage-feedback op

amps that can be configured as an inverting or nonin-

verting gain block, as shown in Figures 1a and 1b. The

gain is determined by the ratio of two resistors and

does not affect amplifier frequency compensation.

In the unity-gain configuration (Figure 1c), maximum

bandwidth and stability are achieved with the MAX4102

when a small feedback resistor is included. This resis-

tor suppresses the negative effects of parasitic induc-

tance and capacitance. A value of 24Ω provides the

best combination of wide bandwidth, low peaking, and

fast settling time. In addition, this resistor reduces the

errors from input bias currents.

Choosing Resistor Values

The values of feedback and input resistors used in the

inverting or noninverting gain configurations are not

critical (as is the case with current-feedback ampli-

fiers), but should be kept small and noninductive.

8 _______________________________________________________________________________________

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