AD8556ARZ Analog Devices Inc, AD8556ARZ Datasheet - Page 25

• Manufacturer Part Number: AD8556ARZ
• Description: IC AMP CHOPPER 2MHZ 10MA 8SOIC
• Manufacturer: Analog Devices Inc
• Series: DigiTrim®r
• Type: Instrumentation Amplifierr

Specifications of AD8556ARZ

• Operating Temperature: -40°C ~ 140°C
• Amplifier Type: Chopper (Zero-Drift)
• Number Of Circuits: 1
• Slew Rate: 1.2 V/µs
• Gain Bandwidth Product: 2MHz
• Current - Input Bias: 49nA
• Voltage - Input Offset: 2µV
• Current - Supply: 2mA
• Current - Output / Channel: 10mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 1
• Bandwidth: 700kHz
• Rail To Rail I/o Type: Rail-Rail I/O
• No. Of Channels: 1
• Supply Voltage Range: 2.7V To 5.5V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Number Of Channels: 1
• Number Of Elements: 5
• Power Supply Requirement: Single
• Common Mode Rejection Ratio: 80dB
• Unity Gain Bandwidth Product (typ): 8MHz
• Single Supply Voltage (typ): 5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Rejection Ratio: 109dB
• Rail/rail I/o Type: Rail to Rail Input/Output
• Single Supply Voltage (min): 4.5V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 140C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Compliant

To show the benefits that the AD8556 brings to new applications
where EMI/RFI signals are present, a part was programmed
with a gain of 70 and a dc offset of 2.5 V to produce a VOUT of
0 V. A test circuit like that shown in Figure 52 was used.
Figure 52 simulates the presence of a noisy common-mode
signal, and Figure 53 shows the response dc values at VOUT.
Figure 53. DC Offset Values at VOUT Caused by Frequency Seep of Input
100
–20
80
60
40
20
0
+2.5V
0
AD8556 (ENHANCED PART FOR EMI)
Figure 52. Test Circuit to Show AD8556 Performance
VARIABLE
Exposed to Common-Mode RFI/EMI Signals
1
2
3
4
200
NON-ENHANCED FOR EMI
VCC
–IN
FILTER
DATA
AD8556
400
U3
FREQUENCY (MHz)
+
–
V3
VCLAMP
VOUT
600
VEE
+IN
8
7
6
5
800
–2.5V
+2.5V
1000
VOUT
1200
Rev. A | Page 25 of 28
The differential bandwidth defines the frequency response of
the filters with a differential signal applied between the two
inputs, VPOS (that is, +IN ) and VNEG (that is, –IN). Figure 54
shows the circuit used to test for AD8556 EMI/RFI susceptibility.
The part is programmed as previously stated during the
common-mode testing.
The response of AD8556 to EMI/RFI differential signals is
shown in Figure 55.
To make a board robust against EMI, the leads at VPOS and
VNEG should be as similar as possible. In this way, any EMI
received by the VPOS and VNEG pins will be similar (that is, a
common-mode input), and rejected by the AD8556. Furthermore,
additional filtering at the VPOS and VNEG pins should give a
better reduction of unwanted behavior compared with filtering
at the other pins.
–1000
–1200
–1400
–200
–400
–600
–800
600
400
200
Figure 54. Test Circuit to Show AD8556 Performance Exposed to
0
Figure 55. Response of AD8556 to EMI/RFI Differential Signals
+2.5V
0
AD8556
NON-ENHANCED PART
1
2
3
4
200
VCC
FILTER
–IN
DATA
Differential Mode RFI/EMI Signals
AD8556
400
U2
FREQUENCY (MHz)
VCLAMP
VOUT
600
VEE
+IN
200mV p-p
8
7
6
5
800
–2.5V
+
–
+2.5V
V2
1000
AD8556
VOUT
1200