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LMH6619QMAK/NOPB

LMH6619QMAK/NOPB首页预览图
型号: LMH6619QMAK/NOPB
PDF文件:
  • LMH6619QMAK/NOPB PDF文件
  • LMH6619QMAK/NOPB PDF在线浏览
功能描述: 130 MHz, 1.25 mA RRIO Operational Amplifier
PDF文件大小: 1210.32 Kbytes
PDF页数: 共30页
制造商: TI1[Texas Instruments]
制造商LOGO: TI1[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝LMH6619QMAK/NOPB
PDF页面索引
120%
PRODUCTPREVIEW
100k
1M 10M 100M 1G
FREQUENCY (Hz)
-18
-15
-12
-9
-6
-3
0
3
6
NORMALIZED I-V GAIN (dB)
C
PD
= 22 pF,
C
F
= 5.6 pF
C
PD
= 47 pF,
C
F
= 10 pF
C
PD
= 100 pF,
C
F
= 15 pF
C
PD
= 222 pF,
C
F
= 18 pF
LMH6619Q
www.ti.com
SNOSC78A JUNE 2012REVISED NOVEMBER 2012
Table 3 shows the measurement results of the LMH6619Q with different photodiodes having various
capacitances (C
PD
) and a feedback resistance (R
F
) of 1 k.
Table 3. TIA (Figure 1) Compensation and Performance Results
C
PD
C
T
C
F CAL
C
F USED
f
3 dB CAL
f
3 dB MEAS
Peaking
(pF) (pF) (pF) (pF) (MHz) (MHz) (dB)
22 24 7.7 5.6 23.7 20 0.9
47 49 10.9 10 16.6 15.2 0.8
100 102 15.8 15 11.5 10.8 0.9
222 224 23.4 18 7.81 8 2.9
Figure 11 shows the frequency response for the various photodiodes in Table 3.
Figure 11. Frequency Response for Various Photodiode and Feedback Capacitors
When analyzing the noise at the output of the TIA, it is important to note that the various noise sources (i.e. op
amp noise voltage, feedback resistor thermal noise, input noise current, photodiode noise current) do not all
operate over the same frequency band. Therefore, when the noise at the output is calculated, this should be
taken into account. The op amp noise voltage will be gained up in the region between the noise gain’s zero and
pole (f
Z
and f
P
in Figure 10). The higher the values of R
F
and C
T
, the sooner the noise gain peaking starts and
therefore its contribution to the total output noise will be larger. It is obvious to note that it is advantageous to
minimize C
IN
by proper choice of op amp or by applying a reverse bias across the diode at the expense of
excess dark current and noise.
DIFFERENTIAL CABLE DRIVER FOR NTSC VIDEO
The LMH6619Q can be used to drive an NTSC video signal on a twisted-pair cable. Figure 12 shows the
schematic of a differential cable driver for NTSC video. This circuit can be used to transmit the signal from a
camera over a twisted pair to a monitor or display located a distance. C
1
and C
2
are used to AC couple the video
signal into the LMH6619Q. The two amplifiers of the LMH6619Q are set to a gain of 2 to compensate for the 75
back termination resistors on the outputs. The LMH6619Q is set to a gain of 1. Because of the DC bias the
output of the LMH6619Q is AC coupled. Most monitors and displays will accept AC coupled inputs.
Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 23
Product Folder Links: LMH6619Q
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