LMH6555 Datasheet PDF - National Semiconductor

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LMH6555
National Semiconductor

Part Number LMH6555
Description Low Distortion 1.2 GHz Differential Driver
Page 8 Pages


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PRELIMINARY
November 2006
LMH6555
Low Distortion 1.2 GHz Differential Driver
General Description
The LMH6555 is an ultra high speed differential line driver
with 50 dB SFDR at 750 MHz. The LMH6555 features a fixed
gain of 13.6 dB. An input to the device allows the output com-
mon mode voltage to be set independent of the input common
mode voltage in order to simplify the interface to high speed
differential input ADC’s . A unique architecture allows the de-
vice to operate as a fully differential driver or as a single-
ended to differential converter.
The outstanding linearity and drive capability (100differen-
tial load) of this device is a perfect match for driving high
speed analog-to-digital converters. When combined with the
ADC081000/ ADC08D1500, the LMH6555 forms an excellent
8-bit data acquisition system with analog bandwidths exceed-
ing 1 GHz.
The LMH6555 is offered in a space saving 16-pin LLP pack-
age.
Features
Typical Unless Otherwise Specified:
−3 dB bandwidth (VOUT = 0.80PP)
±0.5 dB gain flatness (VOUT = 0.80 VPP)
Slew rate
2nd/3rd Harmonics (750 MHz)
Fixed gain
Supply current
Single supply operation
Adjustable common-mode output voltage
1.2 GHz
500 MHz
3000 V/μs
−53/−54 dBc
13.6 dB
120 mA
3.3V ±10%
Applications
Differential ADC driver
National Semiconductor ADC081000/ ADC08D1500
driver
Single ended to differential converter
Differential driver
Intermediate frequency (IF) amplifier
Communication receivers
Oscilloscope front end
Block Diagram
Single Ended to Differential Conversion
20127704
© 2006 National Semiconductor Corporation 201277
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 5)
Human Body Model
Machine Model
VS
Output Short Circuit Duration (one pin to
ground)
Common Mode Input Voltage
2000V
200V
TBD
Infinite
−1V to TBD
Maximum Junction Temperature
Storage Temperature Range
Soldering Information
Infrared or Convection (20 sec.)
Wave Soldering (10 sec.)
+150°C
−65°C to +150°C
235°C
260°C
Operating Ratings (Note 1)
Temperature Range (Note 4)
−40°C to +85°C
Supply Voltage Range
+3.3V ±10%
Package Thermal Resistance (θJA)(Note 4)
16-Pin LLP
65°C/W
3.3V Electrical Characteristics (Note 2)
Unless otherwise specified, all limits are guaranteed for TA= 25°C, VCM_REF = 1.2V, both inputs tied to 0.3V through 50
(RS1 & RS2) each (Note 11), VS = 3.3V, RL = 100Ω differential, VOUT = 0.8 VPP; See Notes section for definition of terms used
throughout the datasheet. Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Min Typ Max Units
(Note 8) (Note 7) (Note 8)
Differential AC Performance
SSBW
LSBW
GF_0.5
Ph_Delta
−3 dB Bandwidth
±0.5 dB Gain Flatness
Phase Delta
VOUT = 0.25 VPP
VOUT = 0.8 VPP
VOUT = 0.8 VPP
Output Differential Phase Difference,
f = 400 MHz
1200
1200
500
TBD
MHz
MHz
deg
TRS/TRL
OS
SR
Rise/ Fall Time
Overshoot
Slew Rate
VOUT = 0.4 VPP
VOUT = 0.4 VPP
0.8V Step, 10% to 90%,(Note 6)
320
14
3000
pS
%
V/µs
ts
AV_DIFF
Settling Time
Insertion Gain (|S21|)
0.8V Step, VOUT within ±0.1%
TBD
TBD
TBD
13.6
TBD
TBD
ns
dB
AV_VAR
Insertion Gain Variation
Distortion And Noise Response
HD2_L
2nd Harmonic Distortion
HD2_M
HD2_H
HD3_L
3rd Harmonic Distortion
HD3_M
HD3_H
OIP3_L
Output 3rd Order Intercept
OIP3_H
OIM3
Third Order Intermodulation
Distortion
eno Output Referred Voltage Noise
NF Noise Figure
Input Characteristics
RIN
RIN_DIFF
CIN
Input Resistance
Differential Input Resistance
Input Capacitance
VCM_REF Input Varied from 0.95V to
1.45V, VOUT = 0.8 VPP
250 MHz (Note 12)
500 MHz (Note 12)
750 MHz (Note 12)
250 MHz (Note 12)
500 MHz (Note 12)
750 MHz (Note 12)
70 MHz (Note 12)
250 MHz (Note 12)
f1 = 70 MHz, f2 = 70 MHz + 10 kHz,
PIN = TBD (Note 12)
>1 MHz
Relative to Differential Inputs
Single Ended Input Drive
Differential Input Drive
Each Input to GND
TBD
TBD
±TBD ±TBD
dB
−60
−62
−53
−67
−61
−54
TBD
TBD
TBD
24
TBD
50
80
0.3
dBc
dBc
dBm
dBc
nV/
dB
TBD
TBD
pF
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Symbol
Parameter
Conditions
Output Characteristics
CMVR
Input Common Mode Voltage
Range
VOOS
Output Offset Voltage
AV_DIFF – AV_CM 30 dB
Differential Mode
TCVOOS
RO
VOUT
Output Offset Voltage
Average Drift
(Note 9)
Output Resistance
RT1 and RT2
Differential Output Voltage Swing ΔAV_DIFF 1 dB
VO_CM
BAL_Error_DC
Output Common Mode Voltage
Range
Output Balance Error
VCM_REF Input Varied,
VOUT = 0.80 VPP
BAL_Error_AC
Min Typ Max Units
(Note 8) (Note 7) (Note 8)
0
TBD
TBD
TBD
0.95
TBD
TBD
±200
50
800
TBD
TBD
±100
TBD
TBD
TBD
1.45
TBD
TBD
V
mV
μV/°C
mV
V
TBD
dB
AV_CM
Common Mode Gain
VCM_REF Characteristics
VOS_CM
Output CM Offset Voltage
IB_CM
VCM_REF Bias Current
RIN_CM
Gain_VCM_REF
VCM_REF Input Resistance
VCM_REF Input Gain to Output
Power Supply
IS Supply Current
PSRR
PSRR_CM
Differential Power Supply
Rejection Ratio
Common Mode PSRR
DC, ΔVO_CMVI_CM
VOS_CM = VO_CM – VCM_REF
0.95V VCM_REF 1.45V (Note 10)
ΔVO_CMVCM_REF
RS1 & RS2 Open (Note 3)
DC, ΔVS = ±0.3V, ΔVOUTVS
DC, ΔVS = ±0.3V, ΔVO_CMVS
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
−100
TBD
0.99
120
76
TBD
TBD
TBD
±50
TBD
TBD
TBD
TBD
dB
mV
μA
k
V/V
mA
dB
dB
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications, see the Electrical Characteristics tables.
Note 2: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating
of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ >
TA.
Note 3: Total supply current is affected by the input voltages connected through RS1 and RS2. Supply current tested with input removed.
Note 4: The maximum power dissipation is a function of TJ(MAX), θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD= (TJ
(MAX) — TA)/ θJA. All numbers apply for package soldered directly into a 2 layer PC board with zero air flow.
Note 5: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)
Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).
Note 6: Slew Rate is the average of the rising and falling edges.
Note 7: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will
also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.
Note 8: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality
Control (SQC) methods.
Note 9: Drift determined by dividing the change in parameter at temperature extremes by the total temperature change.
Note 10: Positive current is current flowing into the device.
Note 11: Quiescent device common mode input voltage is 0.3V.
Note 12: Distortion data taken under single ended input condition.
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Ordering Information
Package
16-Pin LLP
Part Number
LMH6555SQ
LMH6555SQX
Package Marking
L6555SQ
Transport Media
1k Units Tape and Reel
4.5k Units Tape and Reel
NSC Drawing
SQA16A
Definition of Terms and Specifications (Alphabetical order)
Unless otherwise specified, VCM_REF = 1.2V
1. 1. AV_CM (dB)
Change in the output common mode voltage (ΔVO_CM ) with respect to the change in input
common mode voltage (ΔVI_CM)
2. AV_DIFF (dB)
Insertion gain from a single ended 50Ω (or 100differential) source to the differential output
(ΔVOUT)
3. ΔAV_DIFF (dB)
Variation in insertion gain (AV_DIFF) with input signal change (ΔVIN )
4. AV_VAR (dB)
Variation of insertion gain (AV_DIFF) with VCM_REF input change (ΔVCM_REF). Calculated as the
change in AV_DIFF (dB) at various VCM_REF
5. CMVR (V)
Range of input common mode voltage (VI_CM) where the insertion gain (AV_DIFF) is 30 dB larger
than common mode gain (AV_CM) and hence the amplifier’s output is dominated by its
differential output
6. Gain_VCM_REF (V/V)
7. Pin (dBm referenced to
Variation in output common mode voltage (ΔVO_CM) with respect to change in VCM_REF input
(ΔVCM_REF) with maximum differential output
Input power associated with each of the tones for OIM3 testing
50Ω)
8. PSRR (dB)
Differential output change (ΔVOUT) with respect to the power supply voltage change (ΔVS) with
nominal differential output
9. PSRR_CM (dB)
10. RIN (Ω)
11. RIN_DIFF (Ω)
12. RL (Ω)
13. RO (Ω)
14. RS1, RS2 (Ω)
15. RT1, RT2 (Ω)
16. VCM_REF (V)
17. ΔVCM_REF (V)
18. VI_CM (V)
Output common mode voltage change (ΔVO_CM) with respect to the change in the power
supply voltage (ΔVS)
Single ended input impedance to ground
Differential input impedance
Differential output load
Equivalent to RT1 & RT2
Source impedance to VIN+ and VINrespectively
Output impedance looking into each output
Device input pin voltage which controls output common mode
Change in the VCM_REF input voltage
DC average of the inputs (VIN+, VIN)
19. ΔVI_CM (V)
20. VIN+, VIN(V)
21. ΔVIN (V)
22. VO_CM (V)
23. ΔVO_CM (V)
24.
25.
Variation in input common mode voltage (VI_CM)
Device input pin voltages
Terminated (50for single ended and 100for differential) generator voltage
Output common mode voltage (DC average of VOUT+ and VOUT)
Variation in output common mode voltage (VO_CM)
Balance Error. Measure of the output swing balance of VOUT+ and VOUT, 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 into the output
differential voltage change (ΔVOUT)
26. VOOS (V)
AC version of the DC balance error
test
DC Offset Voltage. Differential output voltage measured with both inputs grounded through
50
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