USER’S MANUAL
HS-OP470ARHEV1Z
Evaluation Board
AN1719
Rev.1.00
March 14, 2013
Introduction
The HS-OP470ARHEV1Z evaluation platform is designed to
evaluate the HS-OP470ARH. The evaluation board contains all
the circuitry needed to critique the performance of the
HS-OP470ARH amplifier. The HS-OP470ARH is a radiation
hardened, monolithic quad operational amplifier that provides
highly reliable performance in harsh radiation environments.
Its excellent noise characteristics coupled with an unique array
of dynamic specifications make this amplifier well-suited for a
variety of satellite system applications. Dielectrically isolated,
bipolar process makes this device immune to Single Event
Latch-up.
Power Supply Connections
J3 V-
V+
J1
J4
VREF
C2
4.7µF
D2
R37
0
V-
R44
0
R1
0
C26
4.7µF
D1
R48
0
V+
GND
J2
V- AND V+
IC SUPPLY PINS
0.01µF
C5
Reference Documents
• HS-OP470ARH Data Sheet
FN4471
• HS-OP470ARH SMD
5962-98533
• HS-OP40ARH
ELDRS Test Report
FIGURE 1. POWER SUPPLY CIRCUIT
Evaluation Board Key Features
• Dual Supply Operation: ±5V to ±15V
• Singled-Ended or Differential Input Operation with Gain
(G = 10V/V)
• External VREF input
• Banana Jack Connectors for Power Supply and VREF Inputs
• BNC Connectors for Op Amp Input and Output Terminals
• Convenient PCB Pads for Op Amp Input/Output Impedance
Loading
Figure 1 demonstrates the power supply connections,
decoupling and protection circuitry. External power
connections are made through the V+, V-, VREF, and GND
banana jack connections on the evaluation board. De-coupling
capacitors C2 and C26 provide low-frequency power-supply
filtering, while additional capacitors, C1, C3, C4 and C5, which
are connected close to the part, filter out high frequency noise
and are connected to their respective supplies through R37
and R48 resistors. These resistors are 0 but can be changed
by the user to provide additional power supply filtering, or to
reduce the supply voltage rate-of-rise time. Anti-reverse diodes
D1 and D2 protect the circuit in the momentary case of
accidentally reversing the power supplies to the evaluation
board. The VREF pin can be connected to ground to establish a
ground referenced input for split supply operation.
R39, R47, R49, R50
IN-A
IN-B
IN-C
IN-D
IN+A
IN+B
IN+C
IN+D
2
6
9
13
3
5
10
12
100kΩ
-
4
V+
0Ω
OUT_A
OUT_B
OUT_C
OUT_D
1 R51- R54
7
8
14
R67- R70
OPEN
R14, R16,
R18, R40
IN-
10kΩ
R5, R7,
R9, R35
IN+
VCM
VREF
10kΩ
HS-OP470ARH
+
11
V-
0.01µF
C3
0.1µF
0.1µF
C4
C1
OUT
IN+
R32
100kΩ
VREF
GND
R33
OPEN
FIGURE 2. BASIC DIFFERENTIAL AMPLIFIER CONFIGURATION
AN1719 Rev.1.00
March 14, 2013
Page 1 of 7
HS-OP470ARHEV1Z
Amplifier Configuration
A simplified schematic of the evaluation board is shown in
Figure 2. The input stage with the components supplied is shown
in Figure 3. The circuit implements a Hi-Z differential input with
unbalanced common mode impedance. The differential
amplifier gain is expressed in Equation 1:
V
OUT
=
V
IN+
–
V
IN-
R
F
R
IN
+
V
REF
(EQ. 1)
The outputs (Figure 4) also have additional resistor and capacitor
placements for filtering and loading.
NOTE: Operational amplifiers are sensitive to output capacitance
and may oscillate. In the event of oscillation, reduce output
capacitance by using shorter cables, or add a resistor in series
with the output.
C6
R6
DNP
R11
0Ω
R2
OPEN
R14
DNP
DNP
R20
10kΩ
C23
OPEN
R39
100kΩ
FROM OUT_A
For single-ended input with an inverting gain G = -10V/V, the IN+
input is grounded and the signal is supplied to the IN- input. VREF
must be connected to a reference voltage between the V+ and V-
supply rails. For non-inverting operation with G = 11V/V, the
negative input (IN-) is grounded and the signal is supplied to the
positive input (IN+). The non-inverting gain is strongly dependent
on any resistance from IN- to GND. For good gain accuracy, a 0
resistor should be installed on the empty R11 pad.
IN-A
TO IN-A
IN+A
R5
10kΩ
C7
OPEN
R15
DNP
0Ω
R21
TO IN+A
User-Selectable Options
OPEN
FIGURE 3. INPUT STAGE
Component pads are included to enable a variety of
user-selectable circuits to be added to the amplifier inputs, the
VREF input, outputs and the amplifier feedback loops.
A voltage divider can be added to establish a power
supply-tracking common mode reference using the VREF input.
The inverting and non-inverting inputs have additional resistor
and capacitor placements for adding input attenuation or
feedback capacitors (Figure 3).
OUT_A
C14
R51
OPEN DNP
R59
DNP
R55
0Ω
R63
DNP
R67
0Ω
J13 OUT A
FIGURE 4. OUTPUT STAGE
TABLE 1. HS-OP470ARHEV1Z COMPONENTS PARTS LIST
DEVICE #
C1, C5
C2, C26
C3, C4
C6-C26
D1, D2
J1-J4
J5-J16
R32
R5, R7, R9, R14, R16, R18,
R35, R40
R39, R47, R49, R50
R2, R3, R4, R11, R12, R13,
R20, R21, R22, R23, R25,
R26, R28, R30, R31, R33,
R34, R38, R42, R43, R46,
R55, R56, R57, R58, R59,
R60, R61, R62, R62, R67,
R68, R69, R70
U1
DESCRIPTION
CAP, SMD, 0805, 0.01µF, 50V, 10%, X7R, ROHS
CAP, SMD, 1210, 4.7µF, 50V, 10%, X7R, ROHS
CAP, SMD, 0805, 0.1µF, 25V, 10%, X7R, ROHS
CAP, SMD, 0603, Open Place Holder, ROHS
40V Schottky Barrier Diode
Johnson Components Standard Type Banana Jack, 108-0740-001
AMPHENOL BNC Connector, 31-5329-52RFX
Resistor, SMD, 0603, 100kΩ, 1%, ROHS
Resistor, SMD, 0603, 10kΩ, 1%, 1/16W, ROHS
Resistor, SMD, 0603, 100kΩ, 1%, 1/16W, ROHS
Resistor, SMD, 0603, DNP-Place Holder, ROHS
COMMENTS
Power Supply Decoupling
Power Supply Decoupling
Power Supply Decoupling
User Selectable Capacitors - Not Populated
Reverse Power Protection
Power Supply and Reference Voltage Connector
Connections for Input and Output
VREF Resistor Divider
Gain Setting Resistor
Gain Setting Feedback Resistor
User Selectable Resistors - Not Populated
HS-OP470ARH, Radiation Hardened, Very Low Noise Quad Operational
Amplifier
AN1719 Rev.1.00
March 14, 2013
C15
Page 2 of 7
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