AD8264(Rev0) 查看數據表（PDF） - Analog Devices

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AD8264
(Rev.:Rev0)

Quad, 235 MHz, DC-Coupled VGA and Differential Output Amplifier

Analog Devices 

AD8264

TEST CIRCUITS

VS = ±2.5 V, TA = 25°C, f = 10 MHz, CL = 5 pF, RL = 500 Ω per output (VGAx, VOHx, VOLx), VGAIN = (VGNHx − VGNLO) = 0 V,

VVOCM = GND, VOFSx = GND, gain range = 6 dB to 30 dB, unless otherwise specified.

DC

METER

IPPx

50Ω

IPNx

+

PrA

6dB

–

AD8264

500Ω

VGAx

+

6dB

–

500Ω

VOLx

500Ω

VOHx

DC

METER

SIGNAL

OUT GENERATOR

50Ω

GNHx

VGAIN

GNLO VOCM

OFSx

OVEN

Figure 71. Gain vs. VGAIN vs. Temperature (See Figure 3 and Figure 4)

OSCILLOSCOPE

NETWORK ANALYZER

CH1

50Ω

CH2

50Ω

CH1

50Ω

CH2

50Ω

DIFFERENTIAL

PROBE

IPPx

50Ω

IPNx

+

PrA

6dB

–

AD8264

DIFFERENTIAL

PROBE

+

6dB

–

VGAx

500Ω

VOLx

VOHx

GNHx

VGAIN

GNLO VOCM

OFSx

IPPx

50Ω

IPNx

+

PrA

6dB

–

GNHx

VGAIN

AD8264

GNLO VOCM

DIFFERENTIAL

PROBE

VGAx

+

6dB

–

VOLx

500Ω

VOHx

OFSx

500Ω

Figure 72. Gain Error vs. VGAIN at Various Frequencies to VGAx (See Figure 5)

NETWORK ANALYZER

Figure 74. Frequency Response vs. Gain to Differential Output for Various

Values of VGAIN (See Figure 11)

CH1

50Ω

CH2

50Ω

DIFFERENTIAL

PROBE

IPPx

50Ω

IPNx

+

PrA

6dB

–

AD8264

VGAx

+

6dB

–

VOLx

VOHx

500Ω

GNHx

VGAIN

GNLO VOCM

OFSx

Figure 73. Frequency Response vs. Gain to VGAx for Various Values of VGAIN,

VGAIN = GNHx – GNLO (See Figure 10)

NETWORK ANALYZER

CH1

CH2

50Ω 50Ω

IPPx

50Ω

IPNx

+

PrA

6dB

–

AD8264

DIFFERENTIAL

PROBE

VGAx

+

VOLx

6dB

500Ω

–

CL

VOHx

GNHx GNLO VOCM OFSx

500Ω

CL

Figure 75. Frequency Response to Differential Output for

Various Capacitive Loads (See Figure 12)

Rev. 0 | Page 20 of 40

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