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### VCA810电压控制放大器关键技术特点与应用 #### 概述 VCA810是一款DC耦合、宽带、连续可调的电压控制增益放大器，具有差分输入到单端输出转换的功能，并且具备高阻抗增益控制输入，能够在-40dB至+40dB范围内线性地调节增益（每伏特分贝）。该放大器的工作电压为±5V，增益控制电压可以在0V至-2V之间变化，从而实现从-40dB至+40dB的增益调整。此外，信号带宽和斜率在整个增益调整范围内保持不变。 #### 主要技术特性 1. **高增益调整范围：**高达40dB。 2. **差分输入/单端输出：**支持差分输入信号处理，最终输出为单端信号。 3. **低输入噪声电压：**仅为2.4nV/√Hz。 4. **恒定带宽随增益变化：**带宽稳定在35MHz。 5. **高dB/V增益线性度：**0.3dB。 6. **增益控制带宽：**25MHz。 7. **低输出直流误差：**小于40mV。 8. **高输出电流：**最高可达60mA。 9. **低供电电流：**最大为24.8mA（适用于-40°C至+85°C温度范围）。 #### 应用场景 1. **光接收机时间增益控制：**用于光通信系统中的自动增益控制，确保信号强度的稳定。 2. **声纳系统：**在复杂环境中进行信号处理，提高目标检测能力。 3. **电压可调有源滤波器：**通过改变控制电压来调整滤波器的截止频率或Q值。 4. **对数放大器：**实现信号幅度与输出电压之间的对数关系。 5. **脉冲幅度补偿：**用于补偿由于传输通道引起的脉冲幅度变化。 6. **AGC接收机带RSSI功能：**结合自动增益控制和接收信号强度指示器，实现信号强度的精确测量和自动调整。 7. **替代VCA610：**相比前一代产品，在性能上有显著提升。 #### 工作原理及特性详解 - **差分输入与单端输出：**VCA810提供了一种将差分信号转换为单端信号的方式，这对于需要在前端处理差分信号的应用非常有用。其高阻抗输入可以减少信号损失，保证信号质量。 - **高增益调整范围：**-40dB至+40dB的增益范围允许用户根据不同的应用场景灵活调整放大器的增益水平。这种宽广的增益调整范围使得VCA810能够适应各种信号处理需求。 - **低输入噪声电压：**2.4nV/√Hz的低输入噪声电压保证了在最高增益设置下仍然能获得良好的信噪比（SNR），这对于需要处理微弱信号的应用非常重要。 - **恒定带宽与增益线性度：**无论增益如何变化，VCA810的信号带宽始终保持在35MHz，而增益线性度仅在±1.5dB（对于高品质版本±0.9dB）以内波动，这有助于实现稳定的性能表现。 - **增益控制带宽：**25MHz的增益控制带宽意味着即使在高速变化的控制电压下也能保持良好的响应速度。 - **低输出直流误差：**小于40mV的低输出直流误差减少了直流成分的影响，提高了信号的纯净度。 - **高输出电流能力：**±60mA的输出电流足以驱动大多数负载，包括模拟数字转换器（ADC）和二级放大器等。 - **低供电电流：**在-40°C至+85°C的温度范围内，最大供电电流仅为24.8mA，这意味着它可以在电池供电的应用中节省能源。 #### 结论 VCA810是一款高性能的电压控制增益放大器，拥有广泛的增益调整范围、低噪声、恒定带宽以及高输出电流等特性，使其成为多种信号处理应用的理想选择，如光接收机的时间增益控制、声纳系统、有源滤波器、对数放大器等。通过对VCA810关键技术特点的详细了解，我们可以更好地利用这款器件的优势，满足不同应用场景的需求。

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FEATURES

D HIGH GAIN ADJUST RANGE: 40dB

D DIFFERENTIAL IN/SINGLE-ENDED OUT

D LOW INPUT NOISE VOLTAGE: 2.4nV/Hz

D CONSTANT BANDWIDTH vs GAIN: 35MHz

D HIGH dB/V GAIN LINEARITY: 0.3dB

D GAIN CONTROL BANDWIDTH: 25MHz

D LOW OUTPUT DC ERROR: < 40mV

D HIGH OUTPUT CURRENT: 60mA

D LOW SUPPLY CURRENT: 24.8mA (max for

−40C to +85C temperature range)

APPLICATIONS

D OPTICAL RECEIVER TIME GAIN CONTROL

D SONAR SYSTEMS

D VOLTAGE-TUNABLE ACTIVE FILTERS

D LOG AMPLIFIER

D PULSE AMPLITUDE COMPENSATION

D AGC RECEIVER WITH RSSI

D IMPROVED REPLACEMENT FOR THE

VCA610

+5V

−

OUT

→−

−

40dB

→

+40dB Gain

VCA810

V+

−

Gain

Adjust

DESCRIPTION

The VCA810 is a DC-coupled, wideband, continuously

variable, voltage-controlled gain amplifier. It provides a

differential input to single-ended output conversion with a

high-impedance gain control input used to vary the gain over

a –40dB to +40dB range linear in dB/V.

Operating from ±5V supplies, the gain control voltage for the

VCA810 will adjust the gain from –40dB at 0V input to +40dB

at –2V input. Increasing the control voltage above ground will

attenuate the signal path to > 80dB. Signal bandwidth and

slew rate remain constant over the entire gain adjust range.

This 40dB/V gain control is accurate within ±1.5dB (±0.9dB

for High Grade), allowing the gain control voltage in an AGC

application to be used as a Received Signal Strength

Indicator (RSSI) with ±1.5dB accuracy.

Excellent common-mode rejection and common-mode input

range at the two high-impedance inputs allow the VCA810 to

provide a differential receiver operation with gain adjust. The

output signal is referenced to ground. Zero differential input

voltage gives a 0V output with a small DC offset error. Low

input noise voltage ensures good output SNR at the highest

gain settings.

In applications where pulse edge information is critical, and

the VCA810 is being used to equalize varying channel loss,

minimal change in group delay over gain setting will retain

excellent pulse edge information.

An improved output stage provides adequate output current

to drive the most demanding loads. While principally intended

to drive analog-to-digital converters (ADCs) or 2nd-stage

amplifiers, the ±60mA output current will easily drive

doubly-terminated 50Ω lines or a passive post filter stage

over the ±1.7V output voltage range.

VCA810 RELATED PRODUCTS

SINGLES DUALS

GAIN ADJUST

RANGE (dB)

INPUT

NOISE

(nV/Hz)

SIGNAL

BANDWIDTH

(MHz)

VCA811 — 80 2.4 80

— VCA2612 45 1.25 80

— VCA2613 45 1 80

— VCA2614 45 3.6 40

— VCA2616 45 3.3 40

— VCA2618 45 5.5 30

All trademarks are the property of their respective owners.

VCA810

SBOS275C − JUNE 2003 − REVISED OCTOBER 2004

High Gain Adjust Range, Wideband,

Voltage-Controlled Amplifier

www.ti.com

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.

         

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 !     !   

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SBOS275C − JUNE 2003 − REVISED OCTOBER 2004

www.ti.com

ABSOLUTE MAXIMUM RATINGS

(1)

Power Supply ±6.5V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internal Power Dissipation See Thermal Analysis Section. . . . . . .

Differential Input Voltage ±V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input Common-Mode Voltage Range ±V

. . . . . . . . . . . . . . . . . . . .

Storage Temperature Range: D −40°C to +125°C. . . . . . . . . . . . . .

Lead Temperature (soldering, 10s) +300°C. . . . . . . . . . . . . . . . . . . . .

Junction Temperature +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ESD Rating (Human Body Model) 2000V. . . . . . . . . . . . . . . . . . . .

(Charge Device Model) 1500V. . . . . . . . . . . . . . . . . . .

(Machine Model) 200V. . . . . . . . . . . . . . . . . . . . . . . . . . .

(1)

Stresses above these ratings may cause permanent damage.

Exposure to absolute maximum conditions for extended periods

may degrade device reliability. These are stress ratings only, and

functional operation of the device at these or any other conditions

beyond those specified is not implied.

ELECTROSTATIC

DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instruments rec-

ommends that all integrated circuits be handled with appropriate pre-

cautions. Failure to observe proper handling and installation proce-

dures can cause damage.

ESD damage can range from subtle performance degradation to

complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could

cause the device not to meet its published specifications.

PACKAGE/ORDERING INFORMATION

(1)

PRODUCT PACKAGE-LEAD

PACKAGE

DESIGNATOR

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

MARKING

ORDERING NUMBER

TRANSPORT MEDIA,

QUANTITY

VCA810ID

SO−8

−40

C to +85

VCA810

VCA810ID Rails, 100

VCA810ID

SO−8

−40

C to +85

VCA810

VCA810IDR Tape and Reel, 2500

VCA810AID

SO−8

−40

C to +85

VCA810A

(2)

VCA810AID Rails, 100

VCA810AID

SO−8

−40

C to +85

VCA810A

(2)

VCA810AIDR Tape and Reel, 2500

(1)

For the most current specification and package information, see the Package Option Addendum located at the end of this data sheet.

(2)

The A indicating high grade will appear opposite the pin 1 marking indicator.

PIN CONFIGURATION

Top View SO−8

−

(1)

OUT

VCA810

GND

+In

NOTES: (1) High Grade Indicator. (2) NC = Not Connected.

Gain

Control,

(2)

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ELECTRICAL CHARACTERISTICS: V

= 5V

Boldface limits are tested at +25C.

= 500Ω, and V

= single-ended input on V+ with V− at ground, unless otherwise noted.

VCA810ID

TYP MIN/MAX OVER TEMPERATURE

PARAMETER CONDITIONS +25°C

+25°C

(1)

+0°C to

+70°C

(2)

−40°C to

+85°C

(2)

UNITS

MIN/

MAX

TEST

LEVELS

(3)

AC PERFORMANCE (see Figure 1)

Small-Signal Bandwidth −2V ≤ V

≤ 0 35 30 29 29 MHz min B

Large-Signal Bandwidth V

= 2V

, −2 ≤ V

≤ −1 35 30 29 29 MHz min B

Frequency Response Peaking V

< 500mV

, −2 ≤ V

≤ 0 0.1 0.5 0.5 0.5 dB min B

Slew Rate V

= 3.5V Step, −2 ≤ V

≤ −1, 10%−90% 350 300 300 295 V/µs min B

Settling Time to 0.1% V

= 1V Step, −2 ≤ V

≤ −1 30 40 41 41 ns min B

Rise-and-Fall Time V

= 1V Step, −2 ≤ V

≤ −1 10 12 12.1 12.1 ns min B

Group Delay G=0dB, V

=−1V, f = 5MHz, V

= 500mV

6.2 ns typ C

Group Delay Variation V

< 500mV

, −2 ≤ V

≤ 0, f = 5MHz 3.5 ns typ C

Harmonic Distortion

2nd-Harmonic V

= 1V

, f = 1MHz, V

= −1V, G = 0dB −71 −51 −50 −49 dBc min B

3rd-Harmonic V

= 1V

, f = 1MHz,V

= −1V, G = 0dB −35 −34 −32 −29 dBc min B

Input Voltage Noise V

= −2V 2.4 2.8 3.4 3.5 nV/√Hz max B

Input Current Noise −2V ≤ V

≤ 0V 1.4 1.8 2.0 2.1 pA/√Hz max B

Fully Attenuated Feedthrough f ≤ 1MHz, V

> +200mV −80 −70 dB max B

Overdrive Recovery V

= 2V to 0V, V

= −2V, G = 40dB 100 150 ns min B

DC PERFORMANCE Single-Ended or Differential Input

Output Offset Voltage

(4)

(both inputs grounded)

−2V ≤ V

≤ 0V ±4 22 ±30 ±32 mV max A

Output Offset Voltage Drift ±125 ±125 V/°C max B

Input Offset Voltage

(4)

Both Inputs Grounded ±0.1 0.25 ±0.30 ±0.35 mV max A

Input Offset Voltage Drift ±1 ±1.2 µV/°C max B

Input Bias Current −2V ≤ V

≤ 0V −6 −10 −12 −14 µA max A

Input Bias Current Drift ±25 ±30 nA/°C max B

Input Offset Current −2V ≤ V

≤ 0V ±100 600 ±700 ±800 nA max A

Input Offset Current Drift ±1.4 ±2.2 nA/°C max B

INPUT

Common-Mode Input Range ±2.4 2.3 ±2.3 ±2.2 V min A

Common-Mode Rejection Ratio V

= 0.5V, V

= −2V, Input Referred 95 85 83 80 dB min A

Input Impedance V

= 0V, Single-Ended 1 || 1 MΩ||pF typ C

= 0V, Differential >10||<2 kΩ||pF typ C

Differential Input Range

(5)

= 0V, V

= 0V 3 V

typ C

OUTPUT

Voltage Output Swing V

= −2V, R

≥ 500Ω ±1.8 1.7 ±1.4 ±1.3 V min A

= −2V, R

= 100Ω ±1.7 1.6 ±1.3 ±1.2 V min A

Output Current V

= 0V ±60 40 ±35 ±32 mA min A

Output Short-Circuit Current V

= 0V ±120 mA typ C

Output Impedance V

= 0V, f < 100kHz 0.2 Ω typ C

GAIN CONTROL (V

, Pin 3) Single-Ended or Differential Input

Specified Gain Range ∆V

/∆dB = 25mV/dB ±40 dB typ C

Maximum Control Voltage G = −40dB 0 V typ C

Minimum Control Voltage G = +40dB −2 V typ C

Gain Accuracy −1.8V ≤ V

≤ −0.2V ±0.4 1.5 ±2.5 ±3.5 dB max A

< −1.8V, V

> −0.2V ±0.5 2.2 ±3.7 ±4.7 dB max A

Gain Drift −1.8V ≤ V

≤ −0.2V ±0.02 ±0.03 dB/°C max B

< −1.8V, V

> −0.2V ±0.03 ±0.04 dB/°C max B

Gain Control Slope −40 dB/V typ C

Gain Control Linearity

(6)

−1.8V ≤ V

≤ 0V ±0.3 1 ±1.1 ±1.2 dB max A

< −1.8V ±0.7 1.6 ±2.5 ±3.2 dB max A

Gain Control Bandwidth 25 20 19 19 MHz min B

(1)

Junction temperature = ambient for +25°C specifications.

(2)

Junction temperature = ambient at low temperature limit; junction temperature = ambient +30°C at high temperature limit for over temperature specifications.

(3)

Test levels: (A) 100% tested at +25°C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation.

(4)

Total output offset is: Output Offset Voltage ± Input Offset Voltage x Gain.

(5)

Maximum input at minimum gain for < 1dB gain compression.

(6)

Maximum deviation from best line fit.

(7)

Magnitude.

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ELECTRICAL CHARACTERISTICS: V

= 5V (continued)

Boldface limits are tested at +25C.

= 500Ω, and V

= single-ended input on V+ with V− at ground, unless otherwise noted.

VCA810ID

MIN/MAX OVER TEMPERATURETYP

PARAMETER

TEST

LEVELS

(3)

MIN/

MAX

UNITS

−40°C to

+85°C

(2)

+0°C to

+70°C

(2)

+25°C

(1)

+25°CCONDITIONS

Gain Control Slew Rate 80dB Gain Step 900 dB/ns typ C

Gain Settling Time 1%, 80dB Step 0.8 µs typ C

Input Bias Current V

= −1V −1.5 −3.5 −4.5 −8 µA max A

Gain + Power-Supply Rejection Ratio V

= −2V, G = +40dB, +V

= 5V ±0.5V 0.5 1.5 1.8 2 dB/V max A

Gain − Power-Supply Rejection Ratio V

= −2V, G = +40dB, −V

= 5V ±0.5V 0.7 1.5 1.8 2 dB/V max A

POWER SUPPLY

Specified Operating Voltage ±5 V typ C

Minimum Operating Voltage 4 ±4 ±4 V min A

Maximum Operating Voltage 6 ±6 ±6 V max A

Positive Supply Quiescent Current

Maximum Quiescent Current +V

= +5V, G = −40dB 10 12.5 12.6 12.7 mA min A

Minimum Quiescent Current +V

= +5V, G = −40dB 10 7.5 7.2 7.1 mA max A

Maximum Quiescent Current +V

= +5V, G = +40dB 18 20.5 22 22.3 mA min A

Minimum Quiescent Current +V

= +5V, G = +40dB 18 15.5 14.5 13.5 mA max A

Negative Supply Quiescent Current

(7)

Maximum Quiescent Current −V

= −5V, G = −40dB 12 14.5 14.6 14.7 mA max A

Minimum Quiescent Current −V

= −5V, G = −40dB 12 9.5 9.4 9.3 mA min A

Maximum Quiescent Current −V

= −5V, G = +40dB 20 22.5 24.5 24.8 mA max A

Minimum Quiescent Current −V

= −5V, G = +40dB 20 17.5 16.5 16 mA min A

Positive Power-Supply Rejection Ratio Input Referred, V

= −2V 90 75 75 73 dB min A

Negative Power-Supply Rejection Ratio Input Referred, V

= −2V 85 70 70 68 dB min A

THERMAL CHARACTERISTICS

Specification Operating Range:

ID Package

−40 to +85 °C typ C

Thermal Resistance Junction-to-Ambient

D SO−8 125 °C/W typ C

(1)

Junction temperature = ambient for +25°C specifications.

(2)

Junction temperature = ambient at low temperature limit; junction temperature = ambient +30°C at high temperature limit for over temperature specifications.

(3)

Test levels: (A) 100% tested at +25°C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation.

(4)

Total output offset is: Output Offset Voltage ± Input Offset Voltage x Gain.

(5)

Maximum input at minimum gain for < 1dB gain compression.

(6)

Maximum deviation from best line fit.

(7)

Magnitude.

HIGH GRADE DC SPECIFICATIONS: V

= 5V (VCA810AID)

Boldface limits are tested at +25C.

= 500Ω, and V

= single-ended input on V+ with V− at ground, unless otherwise noted.

VCA810AID

TYP MIN/MAX OVER TEMPERATURE

PARAMETER CONDITIONS +25°C +25°C

(1)

+0°C to

+70°C

(2)

−40°C to

+85°C

(2)

UNITS

MIN/

MAX

TEST

LEVELS

(3)

DC PERFORMANCE Single-Ended or Differential Input

Output Offset Voltage −2V < V

< 0 ±4 14 ±24 ±26 mV max A

Input Offset Voltage ±0.1 0.2 ±0.25 ±0.3 mV max A

Input Offset Current ±100 500 ±600 ±700 mA max A

GAIN CONTROL (V

, Pin 3) Single-Ended or Differential Input

Gain Accuracy −1.8V ≤ V

≤ −0.2V ±0.4 0.9 ±1.9 ±2.9 dB max A

< −1.8V, V

> −0.2V ±0.5 1.5 ±3.0 ±4.0 dB max A

Gain Control Linearity

(4)

−1.8V ≤ V

≤ 0V ±0.3 0.6 ±0.7 ±0.8 dB max A

< −1.8V ±0.7 1.1 ±1.9 ±2.7 dB max A

(1)

Junction temperature = ambient for +25°C specifications.

(2)

Junction temperature = ambient at low temperature limit; junction temperature = ambient +30°C at high temperature limit for over temperature specifications.

(3)

Test levels: (A) 100% tested at +25°C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation.

(4)

Maximum deviation from best line fit.

(5)

Magnitude.

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