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ADA4622-1ARZ-R7 Datasheet(PDF) 32 Page - Analog Devices

Part # ADA4622-1ARZ-R7
Description  30 V, 8 MHz, Low Bias Current, Single-Supply, RRO, Precision Op Amps
PDF  38 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADA4622-1ARZ-R7 Datasheet(HTML) 32 Page - Analog Devices

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ADA4622-1/ADA4622-2/ADA4622-4
Data Sheet
Rev. E | Page 32 of 38
The dominant sources of output noise in the wideband photodiode
preamp design are the input voltage noise of the amplifier, VNOISE,
and the resistor noise due to RF. The gray trace in Figure 96 shows
the noise gain over frequencies for the photodiode preamp.
Calculate the noise bandwidth at the fN frequency by
F
F
S
GBP
N
C
C
C
f
f
)
(
+
=
Figure 97 shows the ADA4622-1/ADA4622-2/ADA4622-4
configured as a transimpedance photodiode amplifier. The
amplifiers are used in conjunction with a photodiode detector
with an input capacitance of 5 pF. Figure 98 shows the transim-
pedance response of the ADA4622-1/ADA4622-2/ADA4622-4
when IPHOTO is 1 µA p-p. The amplifiers have a bandwidth of
2 MHz when they are maximized for a 45° phase margin with
CF = 2 pF. Note that with the PCB parasitics added to CF, the
peaking is only 0.5 dB, and the bandwidth is reduced slightly.
Increasing CF to 3 pF completely eliminates the peaking; however,
increasing CF to 3 pF reduces the bandwidth to 1 MHz.
Table 13 shows the noise sources and total output noise for the
photodiode preamp, where the preamp is configured to have a
45° phase margin for maximum bandwidth and fZ = fX = fN in
this case.
0.1µF
+5V
49.9kΩ
VOUT
0.1µF
–5V
–5V
100
Ω
2pF
ADA4622-1/
ADA4622-2
ADA4622-4
Figure 97. Transimpedance Photodiode Preamplifier
10
100
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
1k
10k
100k
FREQUENCY (Hz)
1M
10M
100M
2pF
3pF
Figure 98. Transimpedance Photodiode Preamplifier Frequency Response
Table 13. RMS Noise Contributions of the Photodiode Preamplifier
Contributor
Expression
RMS Noise (µV)1
RF
2
π
×
×
×
N
F
f
R
4kT
50.8
VNOISE
N
F
D
F
M
S
NOISE
f
C
C
C
C
C
V
×
π
×
+
+
+
×
2
)
(
131.6
Root Sum Square (RSS) Total
2
2
NOISE
F
V
R ×
141
1
RMS noise with RF = 50 kΩ, CS = 5 pF, CF = 2 pF, CM = 3.7 pF, and CD = 0.4 pF.



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