AD28MSP02 datasheet(8/20 Pages) AD

8 / 20 page

AD28msp02

REV. 0

–8–

To select values for the components shown in Figure 7, use the

following equations:

Gain

IN =

π R

FB =

π)(20 ×10

) R

10 k

Ω ≤ R

FB, RIN

≤ 50 kΩ

150 pF

≤ C

≤ 600 pF

Figure 8 shows an example of a typical input circuit configured

for 0 dB gain. The circuit’s diodes are used to prevent the input

signal from exceeding maximum limits.

1.0µF

330pF

INPUT

SIGNAL

VCC

GNDA

MUX

VOLTAGE

REFERENCE

VFBAUX

VINAUX

AD28msp02

20k

Ω

10kΩ

10k

Ω

VFBNORM

VINNORM

Figure 8. Example Analog Input Circuit for 0 dB Gain

Analog Output

The AD28msp02’s differential analog output (VOUTP, VOUTN)

is produced by an on-chip differential amplifier. The differential

amplifier can drive a minimum load of 2 k

Ω (R

≥ 2 kΩ) and

has a maximum differential output voltage swing of

±3.156 V

peak-to-peak (3.17 dBm0). The differential output can be

ac-coupled directly to a load or dc-coupled to an external

amplifier.

Figure 9 shows a simple circuit providing a differential output

with ac coupling. The capacitor of this circuit (COUT) is

optional; if used, its value can be chosen as follows:

OUT =

(60

π) R

C OUT

VOUTP

VOUT N

R L

AD28msp02

Figure 9. Example Circuit for Differential Output

The VOUTP–VOUTN outputs must be used as differential out-

puts; do not use either as a single-ended output. Figure 10

shows an example circuit which can be used to convert the dif-

ferential output to a single-ended output. The circuit uses a

differential-to-single-ended amplifier, the Analog Devices

SSM2141.

SSM2141

+12 V

0.1

µF

0.1

µF

–12 V

OUT

AD28msp02

VOUTP

VOUTN

GNDA

Figure 10. Example Circuit for Single-Ended Output

AD28MSP02 датащи(PDF) 8 Page - Analog Devices

AD28MSP02 датащи(HTML) 8 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

датащи скачать

ссылки URL