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LMH6503
Wideband, Low Power, Linear Variable Gain Amplifier
LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier
June 2004
General Description
The LMH™6503 is a wideband DC coupled differential input
voltage controlled gain stage followed by a high-speed current feedback Op Amp which can directly drive a low impedance load. Gain adjustment range is more than 70dB for up
to 10MHz.
Maximum gain is set by external components and the gain
can be reduced all the way to cut-off. Power consumption is
370mW with a speed of 135MHz . Output referred DC offset
voltage is less than 350mV over the entire gain control
voltage range. Device-to-device Gain matching is within
0.7dB at maximum gain. Furthermore, gain at any V
tested and the tolerance is guaranteed. The output current
feedback Op Amp allows high frequency large signals (Slew
Rate = 1800V/µs) and can also drive heavy load current
(75mA). Differential inputs allow common mode rejection in
low level amplification or in applications where signals are
carried over relatively long wires. For single ended operation, the unused input can easily be tied to ground (or to a
virtual half-supply in single supply application). Inverting or
non-inverting gains could be obtained by choosing one input
polarity or the other.
To further increase versatility when used in a single supply
application, gain control range is set to be from −1V to +1V
relative to pin 11 potential (ground pin). In single supply
operation, this ground pin is tied to a "virtual" half supply.
Gain control pin has high input impedance to simplify its
drive requirement. Gain control is linear in V/V throughout
the gain adjustment range. Maximum gain can be set to be
anywhere between 1V/V to 100V/V or higher. For linear in dB
gain control applications, see LMH6502 datasheet.
The LMH6503 is available in the SOIC-14 and TSSOP-14
package.
G
Features
VS=±5V, TA= 25˚C, RF=1kΩ,RG= 174Ω,RL= 100Ω,A
=A
n -3dB BW 135MHz
n Gain control BW 100MHz
n Adjustment range (typical over temp) 70dB
n Gain matching (limit)
n Slew rate 1800V/µs
n Supply current (no load) 37mA
n Linear output current
n Output voltage (R
is
n Input voltage noise 6.6nV/
n Input current noise 2.4pA/
n THD (20MHz, RL= 100Ω,VO=2VPP) −57dBc
n Replacement for CLC522
= 10, Typical values unless specified.
V(MAX)
= 100Ω)
L
Applications
n Variable attenuator
n AGC
n Voltage controller filter
n Multiplier
±
0.7dB
±
75mA
±
V
3.2V
Typical Application
Gain vs. VGfor Various Temperature
LMH™is a trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200739 www.national.com
20073913
A
VMAX
= 10V/V
20073933
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
LMH6503
Distributors for availability and specifications.
Infrared or Convection (20 sec) 235˚C
Wave Soldering (10 sec) 260˚C
Storage Temperature Range −65˚C to +150˚C
Junction Temperature +150˚C
ESD Tolerance: (Note 4)
Human Body 2KV
Machine Model 200V
±
Input Current
V
Differential
IN
10mA
±
(V+−V−)
Output Current 120mA (Note 3)
Supply Voltages (V
Voltage at Input/ Output pins V
+-V−
) 12.6V
+
+0.8V,V−- 0.8V
Operating Ratings (Note 1)
Supply Voltages (V
Temperature Range −40˚C to +85˚C
Thermal Resistance: θ
14-Pin SOIC 138˚C/W 45˚C/W
14-Pin TSSOP 160˚C/W 51˚C/W
+-V−
) 5Vto12V
JA
θ
Soldering Information:
Electrical Characteristics(Note 2)
Unless otherwise specified, all limits guaranteed for TJ= 25˚C, VS=±5V, A
=±0.1V, RL= 100Ω,VG= +1V. Boldface limits apply at the temperature extremes.
_DIFF
Symbol Parameter Conditions
Frequency Domain Response
BW -3dB Bandwidth V
GF Gain Flatness V
Att Range Flat Band (Relative to Max Gain)
Attenuation Range (Note 13)
BW
Gain Control Bandwidth V
<
0.5
OUT
V
OUT
OUT
−1V
±
0.2dB Flatness, f<30MHZ 20
±
0.1dB, f<30MHZ 6.6
G
PP
<
<
<
V
0.5PP,A
0.5VPP,
<
1V,±0.2dB
G
= 100 50
V(MAX)
= 0V (Note 11) 100 MHz
Control
PL Linear Phase Deviation DC to 60MHz 1.6 deg
G Delay Group Delay DC to 130MHz 2.6 ns
CT (dB) Feed-through V
= −1.2V, 30MHz (Output
G
Referred)
GR Gain Adjustment Range f<10MHz 79
<
f
30MHz 68
Time Domain Response
t
r,tf
Rise and Fall Time 0.5V Step 2.2 ns
OS% Overshoot 0.5V Step 10 %
SR Slew Rate 4V Step (Note 5) 1800 V/µs
∆G Rate Gain Change Rate V
= 0.3V, 10%−90% of final
IN
output
Distortion & Noise performance
HD2 2
HD3 3
THD Total Harmonic Distortion 2V
nd
Harmonic Distortion 2VPP, 20MHz −60 dBc
rd
Harmonic Distortion 2VPP, 20MHz −61 dBc
, 20MHz −57 dBc
PP
En tot Total Equivalent Input Noise 1MHz to 150MHz 6.6 nV/
I
n
Input Noise Current 1MHz to 150MHz 2.4 pA/
DG Differential Gain f = 4.43MHz, RL= 150Ω, Neg.
Sync
DP Differential Phase f = 4.43MHz, R
= 150Ω, Neg.
L
Sync
= 10, VCM= 0V, RF=1kΩ,RG= 174Ω,V
V(MAX)
Min
(Note 6)
Typ
(Note 6)
Max
(Note 6) Units
135
40 MHz
−48 dB
4.6 dB/ns
0.15 %
0.22 deg
JC
-
IN
MHz
MHz
dB
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Electrical Characteristics(Note 2) (Continued)
Unless otherwise specified, all limits guaranteed for TJ= 25˚C, VS=±5V, A
=±0.1V, RL= 100Ω,VG= +1V. Boldface limits apply at the temperature extremes.
_DIFF
Symbol Parameter Conditions
DC & Miscellaneous Performance
GACCU Gain Accuracy (see Application
Notes)
G Match Gain Matching (see Application
Notes)
K Gain Multiplier (see Application
Notes)
V
CM
V
IN_ DIFF
I
RG MAX
I
BIAS
TC
BIAS
I
OFF
TC I
R
IN
C
IN
IV
G
TC IV
RV
CV
V
OUT
R
OUT
I
OUT
V
O
OFFSET
G
G
Input Voltage Range Pin3&6Common Mode,
Differential Input Voltage Across pins3&6
RGCurrent Pins4&5
Bias Current Pins3&6(Note 7) 11 18
Bias Current Drift Pin3&6(Note 8) 100 nA/˚C
Offset Current Pin3&6 0.01 2.0
Offset Current Drift (Note 8) 5 nA/˚C
OFF
Input Resistance Pin3&6 750 kΩ
Input Capacitance Pin3&6 5 pF
VGBias Current Pin 2, VG= 1.4V(Note 7) 45 µA
VGBias Drift Pin 2 (Note 8) 20 nA/˚C
G
VGInput Resistance Pin 2 70 KΩ
VGInput Capacitance Pin 2 1.3 pF
Output Voltage Range RL= 100Ω
Output Impedance DC 0.1 Ω
Output Current V
Output Offset Voltage −1V<V
+PSRR +Power Supply Rejection Ratio
(see (Note 10))
−PSRR −Power Supply Rejection Ratio
(see (Note 10))
CMRR Common Mode Rejection Ratio
(see (Note 9))
I
S
Supply Current RL= Open 37 50
V
=1.0V +0.25 +0.9/−0.4
G
<
<
V
1V
G
<
−0.7V
V
= 1.0 –
G
<
V
−0.7V
|CMRR|
<
V
1V
G
<
1V – +1.7/−1.1
G
<
<
V
1V – +4.0/−4.7
G
>
50dB (Note 9)
Pins3&6(Note 7),
=±2.5V
V
S
Open
R
L
±
4V from Rails
OUT
<
1V
G
Input Referred, 1V change,
VG= 1.4V
Input Referred, 1V change,
VG= 1.4V
Input Referred, V
<
−1.8V
R
V
CM
= Open, VS=±2.5V 12 20
L
<
G
1.8V
=1V
= 10, VCM= 0V, RF=1kΩ,RG= 174Ω,V
V(MAX)
Min
(Note 6)
Typ
(Note 6)
±
0.3 +1.3/−1.5
±
0.4 +4.4/−4.3
Max
(Note 6) Units
±
1.58
1.58
±
±
1.80
±
0.34
±
0.28
±
1.70
±
1.60
±
3.00
±
2.97
±
3.95
±
3.90
±
±
2.0
75
70
1.72 1.87
1.91
±
2.2 V
±
0.37
±
2.30 mA
310
±
3.20
±
4.05
±
90 mA
±
80
±
±
−80 −58
−56
−67 −57
−51
−67 dB
0.7
20
13
2.5
350
380
53
23
dB0V
dB0
V/V
V
µA
µA
V
mV
dB
dB
mA
-
IN
LMH6503
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Electrical Characteristics(Note 2) (Continued)
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.
LMH6503
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 T
Note 3: The maximum output current (I
Note 4: Human body model: 1.5kΩ in series with 100pF. Machine model: 0Ω in series with 200pF.
Note 5: Slew Rate is the average of the rising and falling rates.
Note 6: Typical values represent the most likely parametric norm. Bold numbers refer to over temperature limits.
Note 7: Positive current correspondes to current flowing in the device.
Note 8: Drift determined by dividing the change in parameter distribution at temperature extremes by the total temperature change.
Note 9: CMRR definition: [|∆V
Note 10: +PSRR definition: [|∆V
offset shift subtracted out.
Note 11: Gain Control Frequency Response Schematic:
. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where T
J=TA
OUT
OUT
) is determined by device power dissipation limitations or value specified, whichever is lower.
OUT
/∆VCM|/AV] with 0.1V differential input voltage. ∆V
/∆V+|/AV], -PSRR definition: [|∆V
/∆V−|/AV] with 0.1V differential input voltage. ∆V
OUT
is the change in output voltage with offset shift subtracted out.
OUT
is the change in output voltage with
OUT
>
TA.
J
20073932
Note 12: Gain/Phase normalized to low frequency value at each AV.
Note 13: Flat Band Attenuation (Relative To Max Gain) Range Definition: Specified as the attenuation range from maximum which allows gain flatness specified
±
(either
0.2dB or±0.1dB), relative to A
±
0.2dB: 10V/V down to 1V/V=20dB range
±
0.1dB: 10V/V down to 4.7V/V=6.5dB range
gain. For example, for f<30MHz, here are the Flat Band Attenuation ranges:
VMAX
Connection Diagram
14-Pin SOIC/TSSOP
Top View
20073946
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
14-pin SOIC LMH6503MA LMH6503MA 55 Units/Rail M14A
LMH6503MAX 2.5k Units Tape and Reel
14-Pin TSSOP
LMH6503MT
LMH6503MTX 2.5k Units Tape and Reel
LMH6503MT
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94 Units/Rail
MTC14
LMH6503
Typical Performance Charateristics Unless otherwise specified: V
=±5V, 25˚C, VG=V
S
G_MAX,VCM
= 0V, RF=1kΩ,RG= 174Ω, both inputs terminated in 50Ω,RL= 100Ω, Typical values, results referred to device output:
Small Signal Frequency Response (A
Frequency Response over Temperature (AV= 10) Frequency Response for Various VG(A
= 2) Large Signal Frequency Response (AV=2)
V
20073917 20073916
= 10)
VMAX
Frequency Response for Various VG(A
±
2.5V) Small Signal Frequency Response
(
20073919 20073920
= 10)
VMAX
20073930
20073914
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Typical Performance Charateristics Unless otherwise specified: V
=±5V, 25˚C, VG=V
S
= 0V, RF=1kΩ,RG= 174Ω, both inputs terminated in 50Ω,RL= 100Ω, Typical values, results referred to device
output: (Continued)
LMH6503
G_MAX,VCM
Large Signal Frequency Response
Frequency Response for Various VG(A
(Large Signal) Gain Control Frequency Response
VMAX
20073915
= 100)
Frequency Response for Various V
(Small Signal)
G(AVMAX
= 100)
20073943
20073944
ISvs. V
S
20073964 20073965
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ISvs. V
20073928
S