LMH6518SQE datasheet(7/40 Pages) TI1

tên linh kiện	LMH6518SQE

Giải thích chi tiết về linh kiện	LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier

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'VO_CM

'VOUT

LMH6518

www.ti.com

SNOSB21A – MAY 2008 – REVISED OCTOBER 2008

Table 1. Definition of Terms and Specifications

1.

AV_CM (dB)

Change in output offset voltage (

ΔVOOS) with respect to the change in input common mode

voltage (

ΔVI_CM)

2.

AV_DIFF (dB)

Gain with 100

Ω differential load

3.

CM

Common Mode

4.

CMRR (dB)

Common Mode rejection defined as: AV_DIFF (dB) - AV_CM (dB)

5.

CMRR_CM

Common

Mode

rejection

relative

to

VCM

defined

as:

ΔVOOS /ΔVCM

6.

HG

Preamp High Gain

7.

Ladder

Ladder Attenuator setting (0-20 dB)

8.

LG

Preamp Low Gain

9.

Max Gain

Gain = 38.8 dB

10.

Min Gain

Gain =

−1.16 dB

11.

+Out

Positive Main Output

12.

−Out

Negative Main Output

13.

+Out Aux

Positive Auxiliary Output

14.

−Out Aux

Negative Auxiliary Output

15.

PB

Phase Balance defined as the phase difference between the complimentary outputs relative to

180°

16.

PSRR

Input referred VOOS shift divided by change in VCC

17.

PSRR_CM

Output common mode voltage change (

ΔVO_CM) with respect to VCC voltage change (ΔVCC)

18.

VCM

Input pin voltage that sets Main output CM

19.

VCM_Aux

Input pin voltage that sets Auxiliary output CM

20.

VI_CM

Input CM voltage (average of +IN and

−IN)

21.

ΔVIN (V)

Differential voltage across device inputs

22.

VOOS

DC offset voltage. Differential output voltage measured with inputs shorted together to VCC/2

23.

VO_CM

Output common mode voltage (DC average of V+OUT and V−OUT)

24.

VOS_CM

CM offset voltage: VO_CM - VCM

25.

ΔVO_CM

Variation in output common mode voltage (VO_CM)

26.

Balance Error. Measure of the output swing balance of “+OUT” and “

−OUT”, as reflected on

the output common mode voltage (VO_CM), relative to the differential output swing (VOUT).

Calculated as output common mode voltage change (

ΔVO_CM) divided by the output differential

voltage change (

ΔVOUT, which is nominally around 700 mVPP)

27.

ΔVOUT

Change in differential output voltage (Corrected for DC offset (VOOS))

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