Datasheet

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LMH6503

www.ti.com

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier

Check for Samples: LMH6503

FEATURES

DESCRIPTION

The LMH™6503 is a wideband, DC coupled,

• V

= ±5V, T

= 25°C, R

= 1kΩ, R

= 174Ω, R

differential input, voltage controlled gain stage

100Ω, A

= A

V(MAX)

= 10, Typical Values Unless

followed by a high-speed current feedback Op Amp

Specified.

which can directly drive a low impedance load. Gain

• -3dB BW 135MHz

adjustment range is more than 70dB for up to 10MHz.

• Gain Control BW 100MHz

Maximum gain is set by external components and the

• Adjustment Range (Typical Over Temp) 70dB

gain can be reduced all the way to cut-off. Power

consumption is 370mW with a speed of 135MHz .

• Gain Matching (Limit) ±0.7dB

Output referred DC offset voltage is less than 350mV

• Slew Rate 1800V/µs

over the entire gain control voltage range. Device-to-

• Supply Current (No Load) 37mA

device Gain matching is within 0.7dB at maximum

gain. Furthermore, gain at any V

is tested and the

• Linear Output Current ±75mA

tolerance is ensured. The output current feedback Op

• Output Voltage (R

= 100Ω) ±3.2V

Amp allows high frequency large signals (Slew Rate

• Input Voltage Noise 6.6nV/√Hz

= 1800V/μs) and can also drive heavy load current

• Input Current Noise 2.4pA/√Hz

(75mA). Differential inputs allow common mode

rejection in low level amplification or in applications

• THD (20MHz, R

= 100Ω, V

= 2V

) −57dBc

where signals are carried over relatively long wires.

• Replacement for CLC522

For single ended operation, the unused input can

easily be tied to ground (or to a virtual half-supply in

APPLICATIONS

single supply application). Inverting or non-inverting

gains could be obtained by choosing one input

• Variable Attenuator

polarity or the other.

• AGC

To further increase versatility when used in a single

• Voltage Controller Filter

supply application, gain control range is set to be

• Multiplier

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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2LMH is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (33 pages)

PAGE 1
LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier Check for Samples: LMH6503 FEATURES 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.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com 30 11 dB 20 9 85°C -40°C 0 25°C -10 GAIN (dB) -40°C 8 7 85°C -20 6 25°C -30 5 -40 4 -50 GAIN (V/V) 10 10 3 V/V -60 2 -70 1 VIN_DIFF = ±0.1V -80 0 -1.2 -0.8 -0.4 0 0.4 0.8 1.2 VG (V) Figure 1. Gain vs. VG for Various Temperature Typical Application +5V +VIN 3 R1 50: RF 1k: NC 1 14 12 4 13 RG 170: VOUT LMH6503 10 5 -VIN 6 2 8 7 R2 50: 9 RL 100: 11 -5V VG Figure 2.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) ESD Tolerance: (3) Human Body 2KV Machine Model 200V Input Current ±10mA ±(V+ −V−) VIN Differential 120mA (4) Output Current + − Supply Voltages (V - V ) 12.6V V+ +0.8V,V− - 0.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (1) Unless otherwise specified, all limits ensured for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF = ±0.1V, RL = 100Ω, VG = +1V. Boldface limits apply at the temperature extremes. Parameter Test Conditions Min (2) Typ (2) Max (2) Units Frequency Domain Response BW -3dB Bandwidth VOUT < 0.5PP 135 VOUT < 0.5PP, AV(MAX) = 100 50 40 MHz GF Gain Flatness VOUT < 0.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Electrical Characteristics(1) (continued) Unless otherwise specified, all limits ensured for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF = ±0.1V, RL = 100Ω, VG = +1V. Boldface limits apply at the temperature extremes. Typ (2) Max (2) VG =1.0V +0.25 +0.9/−0.4 0V < VG < 1V ±0.3 +1.3/−1.5 −0.7V < VG < 1V ±0.4 +4.4/−4.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Electrical Characteristics(1) (continued) Unless otherwise specified, all limits ensured for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF = ±0.1V, RL = 100Ω, VG = +1V. Boldface limits apply at the temperature extremes. Parameter IS Min (2) Typ (2) Max (2) RL = Open 37 50 53 RL = Open, VS = ±2.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Typical Performance Charateristics Unless otherwise specified: VS = ±5V, 25°C, VG = VG_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 (AV = 2) Large Signal Frequency Response (AV = 2) 5 5 90 RF = 920:, RG = 820: 3 GAIN 45 0 0 -5 0 -3 GAIN (dB) RF = 2.4k:, RG = 2.1k: -18 -15 -90 -20 -13 -15 -45 -25 VOUT = 0.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: Frequency Response for Various VG (AVMAX = 100) (Small Signal) 270 2 VOUT = 5VPP AVMAX RF(k:) 225 1 GAIN 100 10 2 750 1k 2.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: Input Bias Current vs. VS AVMAX vs. VS 18 12 -40°C 16 10 85°C 14 85°C IB (PA) 25°C 10 -40°C 8 8 AVMAX (V/V) 12 6 6 25°C 4 -40°C 4 2 VG = VG_MAX 2 VIN_DIFF = 0.1V 0 0 2.5 3 3.5 4 4.5 5 5.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: AVMAX vs. VCM AVMAX vs. VCM 12 12 10 10 8 85°C 6 25°C 4 -40°C 8 2 AVMAX (V/V) AVMAX (V/V) 85°C VS = ±2.5V 4 VS = ±5V VIN_DIFF = 0.1V -2 VG = VGMAX -40°C 2 0 VIN_DIFF = 0.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: Output Offset Voltage vs.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: Gain vs. VG Including Limits BW vs. RF for Various RG 1000 12 RG = 100: VIN_DIFF = ±0.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: Output Offset Voltage vs. ±VS for Various VG (Typical Unit 1) Output Offset Voltage vs.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: −1dB Compression Noise vs. Frequency (AVMAX = 100) 24 100k OUTPUT LIMITED , RF = 1.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: HD2 & HD3 vs. VG 90 HD3, 0.25VPP 0.25VPP 80 70 HD2, 0.25VPP 1VPP 60 70 HD2, 1VPP 50 |THD (dBc)| |HD (dBc)| THD vs.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Typical Performance Charateristics (continued) Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL = 100Ω, Typical values, results referred to device output: VG Feedthrough AVMAX= 10 VG (1V/DIV) 0 VOUT VOUT (40mV/DIV) RL= 100: VG 0 t (10ns/DIV) Figure 58.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 APPLICATION INFORMATION THEORY OF OPERATION The LMH6503 is a linear wideband variable-gain amplifier as illustrated in Figure 59. A voltage input signal may be applied differentially between the two inputs (+VIN, −VIN), or single-endedly by grounding one of the two unused inputs.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com CHOOSING RF AND RG RG is calculated using Equation 5. VINPUTMAX is the maximum peak input voltage (Vpk) determined by the application. IRGMAX is the maximum allowable current through RG and is typically 2.3mA. Once AVMAX is determined from the minimum input and desired output voltages, RF is then determined using Equation 6. These values of RF and RG are the minimum possible values that meet the input voltage and maximum gain constraints.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Figure 61. Nulling the Output Offset Voltage Once this is accomplished, the offset errors introduced by the input stage and multiplier core can then be treated. The second step requires the absence of an input signal and matched source impedances on the two input pins in order to cancel the bias current errors. This done, then +1.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com MAX GAIN LIMIT MIN GAIN LIMIT GAIN (V/V) D C TYPICAL GAIN B A BEST FIT LINE VG (V) PARAMETER: GAIN ACCURACY (TYPICAL) = B/C (dB) GAIN ACCURACY (+ & - LIMIT) = D/C & A/C (dB) GAIN MATCHING (+ & - LIMIT) = D/B & A/B (dB) Figure 62. Gain Accuracy and Gain Matching Parameters Defined NOISE Figure 63 describes the LMH6503's output-referred spot noise density as a function of frequency with AVMAX = 10V/V.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 CIRCUIT LAYOUT CONSIDERATIONS Good high-frequency operation requires all of the de-coupling capacitors shown in Figure 64 to be placed as close as possible to the power supply pins in order to insure a proper high-frequency low-impedance bypass. Adequate ground plane and low inductive power returns are also required of the layout.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com R2 510: R1 510: VS 14 +VIN 13 3 + RG 180: -VIN VS/2 RF 1k: 1 COUT 0.1µF 12 LMH6503 6 8 R4 7 2k: R3 2k: C1 0.1µF 11 2 9 10 ROUT 50: VOUT VG RANGE: ±1V FROM PIN 11 VOLTAGE (FOR VS = 10V) Figure 65. AC Coupled Single Supply VGA C1 0.1µF R2 510: R1 510: VS 14 3 13 + RG 160: VS/2 RF 1k: 1 COUT 0.1µF 12 LMH6503 6 7 8 11 9 2 10 ROUT 50: VOUT VG Figure 66.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 Table 1. VG Definition Based on V− VG Definition Expression (V) VG_MIN Gain Cut-off 0.2 x V− VG_MID AVMAX/2 0 VG_MAX AVMAX −0.2 x V− b) VG_LIMIT (maximum permissible voltage on VG) is reduced. This is due to limitations within the device arising from transistor headroom. Beyond this limit, device performance will be affected (non-destructive). Referring to Figure 67, note that with V+ = 2.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com Application Circuits FOUR-QUADRANT MULTIPLIER Applications requiring multiplication, squaring or other non-linear functions can be implemented with fourquadrant multipliers. The LMH6503 implements a four-quadrant multiplier as illustrated in Figure 69: Figure 69. Four Quadrant Multiplier FREQUENCY SHAPING Frequency shaping and bandwidth extension of the LMH6503 can be accomplished using parallel networks connected across the RG ports.
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LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 VO VIN s = - 1 n p = 1.72 s2 + s RF RY 1 CRB p 1 + 2 2 CRB C RY pRB ,Q= RY , ZO = p CRY Figure 71.
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LMH6503 SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision D (April 2013) to Revision E • 26 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMH6503MAX/NOPB SOIC D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.0 Q1 LMH6503MTX/NOPB TSSOP PW 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH6503MAX/NOPB SOIC D 14 2500 367.0 367.0 35.0 LMH6503MTX/NOPB TSSOP PW 14 2500 367.0 367.0 35.
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