ADL5519ACPZ-R2 datasheet(23/39 Pages) AD

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Data Sheet

ADL5519

Rev. C | Page 23 of 39

DIFFERENCE OUTPUT—OUTP, OUTN

The ADL5519 incorporates two operational amplifiers with rail-to-

rail output capability to provide a channel difference output.

As in the case of the output drivers for OUTA, OUTB, the output

stages have the capability of driving greater than 10 mA. OUTA

and OUTB are internally connected through 1 kΩ resistors to the

inputs of each op amp. The VLVL pin is connected to the

positive terminal of both op amps through 1 kΩ resistors to

provide level shifting. The negative feedback terminal is also

made available through a 1 kΩ resistor. The input impedance of

VLVL is 1 kΩ, and the input impedance of FBKA, FBKB is 1 kΩ.

See Figure 57 for the connections of these pins.

OUTP

VPSR

VLVL

FBKA COMR

OUTA

OUTB

OUTN

VPSR

VLVL

FBKB COMR

OUTB

OUTA

1kΩ

Figure 57. OUTP, OUTN Interface Simplified Schematic

If OUTP is connected to FBKA, OUTP is given as

OUTP = OUTA − OUTB + VLVL

(3)

If OUTN is connected to FBKB, OUTN is given as

OUTN = OUTB − OUTA + VLVL

(4)

OUTA

FBKA

FBKB

OUTP

OUTN

OUTB

Figure 58. Op Amp Connections (All Resistors Are 1 kΩ ± 20%)

In this configuration, all four measurements, OUTA, OUTB,

OUTP, and OUTN, are available simultaneously. A differential

output can be taken from OUTP − OUTN, and VLVL can be

used to adjust the common-mode level for an ADC connection.

This is convenient not only for driving a differential ADC but

also for removing any temperature variation on VLVL.

DESCRIPTION OF CHARACTERIZATION

The general hardware configuration used for most of the ADL5519

characterization is shown in Figure 59. The signal sources used

in this example are the E8251A from Agilent Technologies. The

INHA, INHB input pins are driven by Agilent signal sources,

and the output voltages are measured using a voltmeter.

COMPUTER

CONTROLLER

AGILENT

34970A

METER/

SWITCHING

ADL5519

CHARACTERIZATION

BOARD

OUTA

OUTB

OUTP

OUTN

VREF

TEMP

INA

INB

–3dB

SIGNAL

SOURCE

–3dB

SIGNAL

SOURCE

Figure 59. General Characterization Configuration

BASIS FOR ERROR CALCULATIONS

The input power and output voltage are used to calculate the

slope and intercept values. The slope and intercept are calculated

using linear regression over the input range from −40 dBm to

−10 dBm. The slope and intercept terms are used to generate an

ideal line. The error is the difference in measured output

voltage compared to the ideal output line. This is a measure of the

linearity of the device. Refer to the Device Calibration section

for more information on calculating slope, intercept, and error.

Error from the linear response to the CW waveform is not

a measure of absolute accuracy because it is calculated using

the slope and intercept of each device. However, error verifies the

linearity and the effects of modulation on device response.

Similarly, at temperature extremes, error represents the output

voltage variations from the 25°C ideal line performance. Data

presented in the graphs is the typical error distribution observed

during characterization of the ADL5519.

Pulse response of the ADL5519 is 6 ns/8 ns rise/fall times. For

the fastest response time, the capacitance on OUTA, OUTB should

be kept to a minimum. Any capacitance on the output pins should

be counterbalanced with an equal capacitance on the CLPA, CLPB

pins to prevent ringing on the output.

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