LMH6518

SNOSB21C – MAY 2008 – REVISED JULY 2013

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Electrical Characteristics

(1) (continued)

Main & Auxiliary Outputs), both Main and Auxiliary Output Specifications, full bandwidth setting, gain = 18.8 dB (Preamp LG,

0 dB ladder attenuation), Full Power setting

(2). Electrical Characteristics Definition of Terms and Specifications for

abbreviations used in the datasheet. Boldface limits apply at the temperature extremes.

Symbol

Parameter

Condition

Units

Gain_Step

Gain Step Size

All Gains including Preamp Step

1.8

2

2.2

dB

Gain

Step

Size

with

ADC

(See ADC FS Adjusted

8.5

mdB

Applications Information)

Gain_Range

Gain Range

39

40

41

dB

All Gains

−0.8

mdB/°C

Absolute Gain Accuracy

Compared to theoretical from

0.75

—

+0.75

dB

Max Gain in 2 dB steps

Matching

Gain_match

Gain Matching Main/Auxiliary

All Gains

±0.1

±0.2

dB

BW_match

−3 dB Bandwidth Matching

All Gains

5

%

Main/Auxiliary

RT_match

Rise Time Matching Main/ Auxiliary

All Gains

5

%

PD_match

Propagation Delay Matching

All Gains

100

ps

Main/Auxiliary

Analog I/O

CMRR_1

CM Rejection Ratio (see Table 1)

Preamp HG, 0 dB Ladder, 1.9V <

45

86

CMVR < 3.1V

dB

CMRR_2

Preamp LG, 0 dB Ladder, 1.9V <

40

55

CMVR < 3.1V

CMVR_1

Input Common Mode Voltage Range

Preamp HG, All Ladder Steps, CMRR

1.9

—

3.1

≥ 45 dB

V

CMVR_2

Preamp LG, All Ladder Steps, CMRR

1.9

—

3.1

≥ 40 dB

|

All Gains, 2V < CMVR < 3V

−60

−100

dB

CMRR_CM

CM Rejection Ratio relative to VCM (see Preamp LG, 0 dB

101

dB

Table 1)

Differential Input Impedance

All Gains

150||1.5

K

Ω ||

CM Input impedance

Preamp HG

420||1.7

pF

Preamp LG

900||1.7

Full Scale Voltage Swing

Main Output, THD @ 100 MHz

≤

800

−40 dBc, All Gains

Main Output, Clamped, 0 dB Ladder

1800

1960

Auxiliary Output, THD @ 100 MHz

≤

800

−40 dBc All Gains

Auxiliary

Output,

Clamped,0

dB

1600

1760

Ladder

Voltage range at each output pin

0.5

1.8

(clamped)

Auxiliary Output, All Gains,

0.8

2.2

V

2.05

Auxiliary output, All gains,

2.45

Differential Output Impedance

All Gains

92

100

108

Ω

Output Offset Voltage

All Gains

±15

±40

mV

Output Offset Voltage Shift

Preamp LG to Preamp HG

13.7

mV

All Gains, Excluding Preamp Step

12.7

(7)

Drift determined by dividing the change in parameter at temperature extremes by the total temperature change.

(8)

Specified by design.

4

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