LMH6503 datasheet(20/33 Pages) TI1

Part #	LMH6503

Description	LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier

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Manufacturer	TI1 [Texas Instruments]

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100

1k

10k

100k

1M

FREQUENCY (Hz)

10

100

1000

10000

MAX GAIN

MID GAIN

MIN GAIN

AVMAX = 10

RF = 1k:

RG = 180:

VRMS = ein * 1.57 * (-3dB BANDWIDTH)

MIN GAIN LIMIT

TYPICAL GAIN

BEST FIT LINE

D

C

B

A

PARAMETER:

GAIN ACCURACY (TYPICAL) = B/C (dB)

GAIN ACCURACY (+ & - LIMIT) = D/C & A/C (dB)

GAIN MATCHING (+ & - LIMIT) = D/B & A/B (dB)

VG (V)

MAX GAIN LIMIT

LMH6503

SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013

www.ti.com

Figure 62. Gain Accuracy and Gain Matching Parameters Defined

NOISE

Figure 63 describes the LMH6503's output-referred spot noise density as a function of frequency with AVMAX =

10V/V. The plot includes all the noise contributing terms. However, with both inputs terminated in 50

Ω, the input

noise contribution is minimal. At AVMAX = 10V/V, the LMH6503 has a typical flat-band input-referred spot noise

density (ein) of 6.6nV/√Hz. For applications with −3dB BW extending well into the flat-band region, the input RMS

voltage noise can be determined from the following single-pole model:

(9)

Figure 63. Output Referred Voltage Noise vs. Frequency

20

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