LMH6518_15 Datasheet, PDF (4/41 Pages) Texas Instruments – LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier

LMH6518
SNOSB21C – MAY 2008 – REVISED JULY 2013
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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
Applications Information)
8.5
mdB
Gain_Range
TC_A_{V_DIFF}
Gain_A_CC
Gain Range
Gain Temp Coefficient ⁽⁷⁾
Absolute Gain Accuracy
All Gains
Compared to theoretical from
Max Gain in 2 dB steps
39
40
41
dB
−0.8
mdB/°C
0.75
—
+0.75 dB
Matching
Gain_match
Gain Matching Main/Auxiliary
All Gains
±0.1
±0.2
dB
BW_match
−3 dB Bandwidth Matching
Main/Auxiliary
All Gains
5
%
RT_match
Rise Time Matching Main/ Auxiliary
All Gains
5
%
PD_match
Propagation Delay Matching
Main/Auxiliary
All Gains
100
ps
Analog I/O
CMRR_1
CM Rejection Ratio (see Table 1)
Preamp HG, 0 dB Ladder, 1.9V <
45
86
CMRR_2
CMVR < 3.1V
dB
Preamp LG, 0 dB Ladder, 1.9V <
40
55
CMVR < 3.1V
CMVR_1
CMVR_2
Input Common Mode Voltage Range
Preamp HG, All Ladder Steps, CMRR 1.9
—
3.1
≥ 45 dB
V
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
Table 1)
101
dB
Z_{in_diff}
Z_{in_CM}
FS_OUT1
Differential Input Impedance
CM Input impedance
Full Scale Voltage Swing
All Gains
Preamp HG
Preamp LG
Main Output, THD @ 100 MHz ≤
−40 dBc, All Gains
770 ⁽⁸⁾
150||1.5
420||1.7
900||1.7
800
KΩ ||
pF
FS_OUT2
FS_OUT3
Main Output, Clamped, 0 dB Ladder
Auxiliary Output, THD @ 100 MHz ≤
−40 dBc All Gains
770 ⁽⁸⁾
1800
800
1960
mV_PP
FS_OUT4
Auxiliary Output, Clamped,0 dB
Ladder
1600 1760
V_{OUT_MAX1}
V_{OUT_MAX2}
V_{OUT_MAX3}
V_{OUT_MAX4}
Z_{OUT_DIFF}
V_OOS
V_{OOS_shift1}
V_{OOS_shift2}
Voltage range at each output pin
(clamped)
Differential Output Impedance
Output Offset Voltage
Output Offset Voltage Shift
Main Output, All gains, V_CM = 1.2V
0.5
Auxiliary Output, All Gains,
0.8
V_CM = 1.2V
Main Output, All Gains, V_CM = 1.45V
Auxiliary output, All gains,
V_CM = 1.45V
All Gains
92
All Gains
Preamp LG to Preamp HG
All Gains, Excluding Preamp Step
1.8
2.2
V
2.05
2.45
100
108
Ω
±15
±40
mV
13.7
mV
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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