LMH6732MFX datasheet(17/19 Pages) NSC

17 / 19 page

Application Information: (Continued)

TABLE 2. Feedback Resistor Selection for Various

Gain Settings and I

CC’s

Gain (V/V)

CC (mA)

Unit

3.4

V = +1

700

Ω

V = +2

700

Ω

V = −1

500

750

Ω

V = −2

400

450

Ω

V = +6

500

Ω

V = −6

200

Ω

V = +21

Ω

V = −20

500

Ω

For I

CC > 9mA at any closed loop gain setting, a good

starting point for R

F would be the 9mA value stated in Table

2 above. This value could then be readjusted, if necessary,

to achieve the desired response.

PRINTED CIRCUIT LAYOUT & EVALUATION BOARDS

Generally, a good high frequency layout will keep power

supply and ground traces away from the inverting input and

output pins. Parasitic capacitances on these nodes to

ground will cause frequency response peaking and possible

circuit oscillations (see Application Note OA-15 for more

information). National Semiconductor suggests the following

evaluation boards as a guide for high frequency layout and

as an aid in device testing and characterization:

Device

Package

Evaluation Board

Part Number

LMH6732MF

SOT23-6

CLC730216

LMH6732MA

SOIC

CLC730227

These evaluation boards are shipped when a device sample

request is placed with National Semiconductor. The supply

current adjustment resistor, R

P, in both evaluation boards

should be tied to the appropriate potential to get the desired

supply current. To do so, leave R2 (CLC730216) [R5

(CLC730227) ] uninstalled. Jumper "Dis" connector to V

−.

Install R1 (CLC730216) [ R4 (CLC730227) ] to set the supply

current.

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