an1347

ISL5519xEVAL1Z Evaluation Board User’s Guide
August 21, 2007
-5V
Introduction
The ISL5519xEVAL1Z evaluation board is a design platform
containing all the circuitry needed to characterize critical
performance parameters of the ISL55190 and ISL55191
single op amps, using a variety of user defined test circuits.
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+5V
Application Note
GND
®
+5V
-5V
C4
The ISL5519x amplifiers are single high speed operational
amplifiers featuring low noise, low distortion, and rail-to-rail
output drive capability. They are designed to operate with
single and single supplies from +5VDC (±2.5VDC) down to
+3VDC (±1.5VDC).
C5
+
4.7µF
R17
0
0.1µF
C9
R18
0
0.1µF
C8
C6
1000pF
D1
Reference Documents
C7
+
4.7µF
1000pF
D2
FIGURE 1. POWER SUPPLY CIRCUIT
• ISL55190 Data Sheet, FN6262
.
Amplifier Configuration (Figure 2)
• ISL55191 Data Sheet, FN6263
The schematic of op amp with the components supplied is
shown in Figure 2. The circuit implements a differential input
amp with a closed loop gain of 10. A series 50Ω
back-termination is included for driving 50Ω cables. The
circuit can operate from a single 3VDC to +5VDC supply, or
from dual supplies from ±1.5VDC to ±2.5VDC.
Evaluation Board Key Features
The ISL5519xEVAL1Z is designed to enable the IC to
operate from a single supply (+3VDC to +5VDC), or from
split supplies (±1.5VDC to ±2.5V). The board is configured
for differential input with a closed loop gain of 10.
Power Supplies (Figure 1)
External power connections are made through the V+, Vand Ground connections on the evaluation board. For single
supply operation, the V- and GND pins are tied together to
the power supply negative terminal. For split supplies V+
and V- terminals connect to their respective power supply
terminals. De-coupling capacitors C4, C9, connect to ground
through R17, R18, 0Ω resistors. Two additional capacitors,
C6 and C8 are placed close to the IC and provide additional
high frequency filtering. Anti-reverse diodes D1 and D2
protect the circuit in the case of accidental polarity reversal.
1k
ISL5519x
RFA
J1
R11
IN-
VP
IN-
-
100
R12
IN+
IN+
100
R4
V-
50Ω
VOUT
+
VM
J2
VCM
V+
R14
1k
GND
FIGURE 2. BASIC AMPLIFIER CONFIGURATION
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1347
User-Selectable Options (Figures 3 and 4)
Component pads are included to enable a variety of
user-selectable circuits to be added to the amplifier inputs,
outputs and the amplifier feedback loops. The output
(Figure 3) has additional resistor and capacitance
placements for loading, and the inverting and non-inverting
inputs (Figure 4) have additional resistor placements and
auxiliary BNC connectors for added flexibility. The ISL5519x
op amps are high bandwidth amplifiers and sensitive to
input/output parasitics. It is therefore crucial to use
appropriate cabling when working with these devices.
J1
DNP
100
DNP
R9
DNP
R2
TO IN DNP
R11
RGA
R5
IN-
J2
R4
OUT
DNP
R16
0
R6
R12
DNP
100
TO IN +
R14
DNP
R10
DNP
R3
OPEN
IN+
C3
OPEN
R13
DNP
C1
R8
R1
DNP
49.9
1k
TO VOUT
FIGURE 4. INPUT STAGE
FIGURE 3. OUTPUT STAGE
ISL5519xEVAL1Z Components Parts List
DEVICE NUMBER
DESCRIPTION
COMMENTS
C5, C7
CAP-TANTALUM, SMD, D, 4.7µF, 50V, 10%, LOW ESR, ROHS
Power supply decoupling
C4, C9
CAP, SMD, 0603, 0.1µF, 25V, 10%, X7R, ROHS
Power supply decoupling
C6, C8
CAP, SMD, 0603,1000pF, 25V, 10%, X7R, ROHS
User selectable capacitors - not
populated
C1-C3, CFA
CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS
User selectable capacitors - not
populated
DIODE-RECTIFIER, SMD, SOD-123, 2P, 40V, 0.5A, ROHS
Reverse power protection
D1, D2
U1 (ISL55190EVAL1Z)
ISL55190FUZ, IC-RAIL-TO-RAIL OP AMP, 10P, MSOP, ROHS
U1 (ISL55191EVAL1Z)
ISL55191FUZ, IC-RAIL-TO-RAIL OP AMP, 10P, MSOP, ROHS
R1-R3, R5, R6, R8-R10, R15,
R16, RGA
RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER
User selectable resistors - not
populated
RES, SMD, 0603, 0Ω, 1/16W, TF, ROHS
0Ω user selectable resistors
R4
RES, SMD, 0603, 49.9Ω, 1/10W, 1%, TF, ROHS
Output series resistors
R7
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
Enable pull-up resistors
R14, RFA
RES, SMD, 0603, 1.00k, 1/10W, 1%, TF, ROHS
Gain resistors
R11, R12
RES, SMD, 0805, 100Ω, 1/8W, TF, ROHS
Gain resistors
R13, R17, R18
2
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Application Note 1347
ISL5519xEVAL1Z Top View
3
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Application Note 1347
+5V
-5V
GND
ISL5519xEVAL1Z Schematic Diagram
+5V
-5V
C5
C7
4.7uF
C4
4.7uF
R17
R18
0
0
0.1uF
C9
0.1uF
C8
C6
1000pF
1000pF
D2
D1
R4
R16
DNP
C3
OPEN
0
OPEN
R13
C1
R8
R1
DNP
DNP
49.9
3
4
OUT
RFA
1
1k
2
RGA
DNP
1k
DNP
3
R14
R9
100
DNP
DNP
R2
DNP
OPEN
R11
R15
R5
IN-
CFA
J1
4
9
1
2
3
4
U1
DFN08
Generic
Pack.
8
7
6
5
8
7
6
5
EP
J2
R12
DNP
100
DNP
R6
R10
DNP
R3
IN+
+5V
EN
2
R7
10K
C2
1
OPEN
3
-5V
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to
verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
4
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August 21, 2007
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