AD8432-EVALZ Analog Devices Inc, AD8432-EVALZ Datasheet - Page 20
![BOARD EVALUATION FOR AD8432](/photos/24/6/240684/4683854_sml.jpg)
AD8432-EVALZ
Manufacturer Part Number
AD8432-EVALZ
Description
BOARD EVALUATION FOR AD8432
Manufacturer
Analog Devices Inc
Datasheet
1.AD8432-EVALZ.pdf
(28 pages)
Specifications of AD8432-EVALZ
Channels Per Ic
2 - Dual
Amplifier Type
Voltage Feedback
Output Type
Differential
Slew Rate
295 V/µs
-3db Bandwidth
200MHz
Current - Output / Channel
77mA
Operating Temperature
-40°C ~ 85°C
Current - Supply (main Ic)
24mA
Voltage - Supply, Single/dual (±)
4.5 V ~ 5.5 V
Board Type
Fully Populated
Utilized Ic / Part
AD8432
Silicon Manufacturer
Analog Devices
Application Sub Type
Noise Amplifier
Kit Application Type
Amplifier
Silicon Core Number
AD8432
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
AD8432
Table 6. Feedback Resistance for Several R
Desired R
50
75
100
200
1 k
50
100
50
100
50
100
Figure 68. Noise Figure vs. R
18
16
14
12
10
8
6
4
2
0
Figure 67. Noise Figure vs. R
50
8
7
6
5
4
3
2
1
0
50
(SIMULATED RESULTS)
IN
(SIMULATED RESULTS)
R
R
R
R
R
R
(Ω)
IN
IN
IN
IN
IN
IN
= 1kΩ
= 200Ω
= 100Ω
= 75Ω
= 50Ω
= UNTERMINATED
100
100
Differential Gain (V/V)
4
4
4
4
4
8
8
12
12
16
16
Unterminated Inputs
S
UNTERMINATED
for Various Values of R
R
S
S
R
for Resistive, Active Match, and
S
(Ω)
(Ω)
ACTIVE IMPEDANCE
RESISTIVE TERMINATION
MATCH
(R
S
= R
IN
IN
IN
, Actively Matched
and Gain Combinations
Single-Ended Gain,
G/2 (V/V)
2
2
2
2
2
4
4
6
6
8
8
)
1k
1k
Rev. B | Page 20 of 28
Exact R
Equation 2
151.2
227.8
304.9
620
3.58 k
252
508.2
352.9
711.5
453.7
914.8
The user must determine the level of matching accuracy desired
and adjust R
load to OPL that OPH does not see. The user can add an identical
load on OPH to improve slightly the distortion caused by this
imbalance.
There is a feedback capacitor (C
Figure 65) because the dc levels of the positive output and the
positive input are different. At higher frequencies, the value
The unterminated bandwidth (R
has a low input-referred voltage noise of 0.85 nV/√Hz at the
lowest gain, 12.04 dB (unterminated configuration). To achieve
such low noise, the dual amplifier consumes 24 mA, resulting in
a power consumption of 120 mW.
of the feedback capacitor must be considered.
FB
(Ω),
FB
accordingly. The R
R
150
226
301
619
3.57 k
250
511
357
715
453
909
FB
(Ω), 1% Standard Value
FB
FB
) in series with R
= ∞) is 200 MHz. The AD8432
FB
and C
FB
network presents a
FB
Actual R
Equation 2
49.6
74.4
98.7
199.7
998.4
49.6
100.5
50.6
100.5
49.9
99.4
(see
IN
(Ω),