AD8432-EVALZ Analog Devices Inc, AD8432-EVALZ Datasheet - Page 20

• Manufacturer Part Number: AD8432-EVALZ
• Description: BOARD EVALUATION FOR AD8432
• Manufacturer: Analog Devices Inc

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),