Datasheet > AD823A-2ARM-EBZ

AD823A-2ARM-EBZ

更新时间： 2022-10-09 09:18:41

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	509K
描述
Wide Supply Dual, 17 MHz, Rail-to-Rail

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AD823A-2ARM-EBZ 数据手册

Data Sheet

AD823A

OPEN-LOOP GAIN

I TO V GAIN

G = R C s

G = 1 + C /C

S F

G = 1

G = R C (s)

G = 1

F S

log f

0°

–45°

90°

45°

0°

–90°

log f

–135°

–180°

–45°

–90°

(A) WITHOUT COMPENSATION

(B) WITH COMPENSATION

–135°

Figure 43. Gain and Phase Plot of the Transimpedance Amplifier Design

1.2pF

The dominant sources of output noise in the wideband

photodiode preamp design are the input voltage noise of the

amplifier, V_NOISEand the resistor noise due to R_F. The gray curve

in Figure 43 shows the noise gain over frequencies for the

photodiode preamp. The noise bandwidth is at the frequency f_N,

and it can be calculated by

49.9kΩ

+5V

0.1µF

–5V

OUT

AD823A

f_u

(6)

f_N

100Ω

(

C_S+ C_FC_F

)

Figure 44 shows the AD823A configured as a transimpedance

photodiode amplifier. The amplifier is used in conjunction with

a photodiode detector with input capacitance of 5 pF. Figure 45

shows the transimpedance response of the AD823A when I_PHOTO

is 1 µA p-p. The amplifier has a bandwidth of 2.2 MHz when it

is maximized for a 45° phase margin with C_F= 1.2 pF. Note that

with the PCB parasitics added to C_F, the peaking is only 0.5 dB

and the bandwidth is slightly reduced. Increasing C_Fto 2.7 pF

completely eliminates the peaking. However, it reduces the

bandwidth to 1.2 MHz.

–5V

Figure 44. Photodiode Preamplifier

= 1µA p-p

PHOTO

= 2.7pF

= 1µA p-p

PHOTO

= 1.2pF

Table 8 shows the noise sources and total output noise for the

photodiode preamp, where the preamplifier is configured to

have a 45° phase margin for maximal bandwidth and f_z= f_x= f_n

in this case.

10k

100k

FREQUENCY (Hz)

10M

Figure 45. Photodiode Preamplifier Frequency Response

Rev.B | Page 17 of 20

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