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ADA4350ARUZ-R7 数据表(PDF) 35 Page - Analog Devices

部件名 ADA4350ARUZ-R7
功能描述  FET Input Analog Front End with ADC Driver
PDF  38 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADA4350ARUZ-R7 数据表(HTML) 35 Page - Analog Devices

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ADA4350
Data Sheet
Rev. B | Page 34 of 37
RF0
CF0
TIA
100Ω
IPHOTO
CD = 91pF TO 100nF
S0
S6
RF1
CF1
RF2
CF2
RF3
CF3
RF4
CF4
S1
S7
S2
S8
S3
S9
S4
S10
NOTES
1. RFx ARE THE FEEDBACK RESISTORS SPECIFIC TO EACH TRANSIMPEDANCE PATH. CFx ARE THE FEEDBACK
CAPACITORS SPECIFIC TO EACH TRANSIMPEDANCE PATH.
Figure 61. ADA4350 Configured as a Transimpedance Amplifier with Five Different Gains
TRANSIMPEDANCE GAIN AMPLIFIER
PERFORMANCE
Figure 61 shows the ADA4350 configured as a transimpedance
amplifier with five different gains. The photodiode sensor
capacitance, CD, varies from 91 pF to 100 nF to showcase the
transimpedance gain performance at various frequency. Figure 62
to Figure 65 shows the transimpedance vs. frequency at different
CD settings. Note that the compensation capacitors, CF0 to CF4,
correct for the inherent instability of the transimpedance
configuration. Capacitors chosen were such that the trans-
impedance gain response compensates for the maximum
bandwidth and is close to having a 45° phase margin.
0.01k
0.1k
1k
10k
100k
1M
0.1M
1M
10M
100M
FREQUENCY (Hz)
RF0 = 1kΩ
RF1 = 3kΩ
RF2 = 10kΩ
RF3 = 30kΩ
RF4 = 100kΩ
CD = 91pF
RF0 = 1kΩ, CF0 = 15pF
RF1 = 3kΩ, CF1 = 6.8pF
RF2 = 10kΩ, CF2 = 3.3pF
RF3 = 30kΩ, CF3 = 2.2pF
RF4 = 100kΩ, CF4 = 1pF
CD = 91pF
Figure 62. Transimpedance vs. Frequency, CD = 91 pF
FREQUENCY (Hz)
10k
100k
1M
10M
100M
1k
10k
100k
1M
0.1k
0.01k
RF0 = 1kΩ, CF0 = 33pF
RF1 = 3kΩ, CF1 = 15pF
RF2 = 10kΩ, CF2 = 10pF
RF3 = 30kΩ, CF3 = 5.6pF
RF4 = 100kΩ, CF4 = 3.3pF
CD = 1nF
Figure 63. Transimpedance vs. Frequency, CD = 1 nF



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