551600075-001 National Semiconductor, 551600075-001 Datasheet - Page 28

• Manufacturer Part Number: 551600075-001
• Description: BOARD FOR SOIC LMH6612/19
• Manufacturer: National Semiconductor
• Series: WEBENCH® Buildit Boardr

Specifications of 551600075-001

• Channels Per Ic: 2 - Dual
• Amplifier Type: General Purpose
• Board Type: Bare (Unpopulated)
• Utilized Ic / Part: LMH6612, LMH6619
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Output Type: -
• Current - Output / Channel: -
• Voltage - Supply, Single/dual (±): -
• -3db Bandwidth: -
• Slew Rate: -
• Current - Supply (main Ic): -

www.national.com
Note:
GBWP = 130 MHz
C
C
V
Figure 14
todiodes in
FIGURE 14. Frequency Response for Various Photodiode
When analyzing the noise at the output of the TIA, it is im-
portant to note that the various noise sources (i.e. op amp
T
IN
S
= C
= ±2.5V
= 2 pF
PD
(pF)
C
100
222
330
+ C
22
47
PD
shows the frequency response for the various pho-
IN
Table
and Feedback Capacitors
4.
(pF)
102
224
332
C
24
49
T
TABLE 4. TIA
C
11.15
20.39
5.42
7.75
20.2
(pF)
F CAL
(Figure
30033635
1) Compensation and Performance Results
C
F USED
(pF)
5.6
12
18
22
28
8
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 out-
put 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
the values of R
starts and therefore its contribution to the total output noise
will be larger. It is advantageous to minimize C
choice of op amp or by applying a reverse bias across the
diode but this will be at the expense of excess dark current
and noise.
EVALUATION BOARD
National Semiconductor provides the following evaluation
board as a guide for high frequency layout and as an aid in
device testing and characterization. Many of the datasheet
plots were measured with this board:
This evaluation board can be shipped when a device sample
request is placed with National Semiconductor.
LMH6611MK
Device
f
−3 dB CAL
(MHz)
29.3
20.5
14.2
9.6
7.9
F
and C
T
, the sooner the noise gain peaking
Package
TSOT23
f
Z
−3 dB MEAS
and f
(MHz)
27.1
15.2
10.7
21
9
P
in
Figure
Board Part #
LMH730216
13). The higher
Peaking
IN
(dB)
0.5
0.5
0.5
0.5
0.8
by proper