Datasheet

LMH6518
SNOSB21C –MAY 2008–REVISED JULY 2013 www.ti.com
Electrical Characteristics
(1)
(continued)
Unless otherwise specified, all limits are ensured for T
A
= 25°C, Input CM = 2.5V, V
CM
= 1.2V, V
CM_Aux
= 1.2V, Single-ended
input drive, V
CC
= 5V, V
DD
= 3.3V, R
L
= 100Ω differential (both Main & Auxiliary Outputs), V
OUT
= 0.7 V
PP
differential (both
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 Min
(3)
Typ
(4)
Max
(3)
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
TC_A
V_DIFF
Gain Temp Coefficient
(7)
All Gains −0.8 mdB/°C
Gain_A
CC
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
|ΔV
O_CM
|Δ
I_CM
| 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)
Z
in_diff
Differential Input Impedance All Gains 150||1.5
KΩ ||
Z
in_CM
CM Input impedance Preamp HG 420||1.7
pF
Preamp LG 900||1.7
FS
OUT1
Full Scale Voltage Swing Main Output, THD @ 100 MHz ≤ 770
(8)
800
−40 dBc, All Gains
FS
OUT2
Main Output, Clamped, 0 dB Ladder 1800 1960
mV
PP
FS
OUT3
Auxiliary Output, THD @ 100 MHz ≤ 770
(8)
800
−40 dBc All Gains
FS
OUT4
Auxiliary Output, Clamped,0 dB 1600 1760
Ladder
V
OUT_MAX1
Voltage range at each output pin Main Output, All gains, V
CM
= 1.2V 0.5 1.8
(clamped)
V
OUT_MAX2
Auxiliary Output, All Gains, 0.8 2.2
V
CM
= 1.2V
V
V
OUT_MAX3
Main Output, All Gains, V
CM
= 1.45V 2.05
V
OUT_MAX4
Auxiliary output, All gains, 2.45
V
CM
= 1.45V
Z
OUT_DIFF
Differential Output Impedance All Gains 92 100 108 Ω
V
OOS
Output Offset Voltage All Gains ±15 ±40 mV
V
OOS_shift1
Output Offset Voltage Shift Preamp LG to Preamp HG 13.7
mV
V
OOS_shift2
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.
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