AD8436-EVALZ Analog Devices, AD8436-EVALZ Datasheet - Page 15

• Manufacturer Part Number: AD8436-EVALZ
• Description: Power Management IC Development Tools Eval Board
• Manufacturer: Analog Devices
• Type: Other Power Managementr
• Series: AD8436r

Specifications of AD8436-EVALZ

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: AD8436
• Input Voltage: + / - 18 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Factory Pack Quantity: 1

Data Sheet
Configure the output buffer (see Figure 37) to invert dc output.
Current Output Option
If a current output is required, connect the current output,
OUT, to the destination load. To maximize precision, provide a
means for external calibration to replace the internal trimmed
resistor, which is bypassed. This configuration is useful for conve-
nient summing of the
for polarity inversion.
Single Supply
Connections for single supply operation are shown in Figure 39
and are similar to those for dual power supply when the device is
ac-coupled. The analog inputs are all biased to half the supply
voltage, but the output remains referred to ground because the
output of the
connection is required at IGND to suppress ambient noise.
RMS
CORE
Figure 36. Output Buffer Amplifier Configured as a Two-Pole, Sallen-Key
CORE
Figure 38. Connections for Current Output Showing Voltage Inversion
OGND
2
OGND
8kΩ
8
OGND
16kΩ
CAVG
8
OUT
AD8436
19
16kΩ
Figure 37. Inverting Output Configuration
OUT
CORE
8
9
16kΩ
9
CCF
18
32.4kΩ
DO NOT CONNECT FOR
CURRENT OUTPUT
AD8436
is a current source. An additional bypass
16kΩ
2C
DIRECTION OF
DC OUTPUT
CURRENT
C
Low-Pass Filter
13
12
result with another voltage, or
12
13
OBUFIN+
OBUFIN–
16kΩ
OBUFIN+
OBUFIN–
9
16kΩ
OUT
16kΩ
–
+
32.4kΩ
+
–
15kΩ
+
–
OBUFOUT
(OPTIONAL)
OBUFOUT
2kΩ
INVERTED DC
VOLTAGE
OUTPUT
14
14
Rev. B | Page 15 of 24
Recommended Application
Figure 40 shows a circuit for a typical application for frequencies
as low as power line, and above. The recommended averaging,
crest factor and LPF capacitor values are 10 μF, 0.1 μF and
3.3 μF. Refer to the Using the Output Buffer section if additional
low-pass filtering is required.
Converting to Average Rectified Value
To configure the
conversion, simply reduce the value of CAVG to 470 pF (see
Figure 41). To enable both modes of operation, insert a switch
between capacitor CAVG and Pin CAVG.
AC IN
10MΩ
10µF
0.47µF
0.47µF
4.7µF
10MΩ
Figure 39. Connections for Single Supply Operation
1
2
3
4
5
DNC
RMS
IBUFOUT
IBUFIN–
IBUFIN+
Figure 40. Typical Application Circuit
AD8436
2
3
4
5
IBUFGN
SUM
RMS
IBUFOUT
IBUFIN–
IBUFIN+
6
20
10µF
OGND
19
CAVG
CAV
19
+
DNC
for rectified average instead of rms
8
7
AD8436
0.1µF
AD8436
10µF
18
OGND
CCF
8
3.3µF
17
VCC
VEE
VCC
VCC
OUT
9
17
10
IGND
OBUFOUT
IBUFV+
OUT
16
OBUFIN–
OBUFIN+
10
OBUFV+
VEE
IGND
11
9
VEE
15
14
13
12
11
AD8436
4.7µF
DC
OUT