ADP7183-EVALZ/ADP7185-EVALZ User Guide
UG-795
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the ADP7183 and ADP7185 Ultralow Noise, High PSRR, Low Dropout
Linear Regulators
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 9
FEATURES
Input voltage range: −2.0 V to −5.5 V
Output current range
ADP7183: 0 mA to −300 mA
ADP7185: 0 mA to −500 mA
Output voltage accuracy
ADP7183: ±2.6%
ADP7185: ±2.2%
Operating temperature range: −40°C to +125°C
Adjustable option voltage set with two external resistors
(R1 and R2), VOUT = −0.5 V × (1 + R1/R2)
GENERAL DESCRIPTION
The ADP7183 and ADP7185 evaluation boards demonstrate
the functionality of the ADP7183 and ADP7185 series of linear
regulators.
Simple device measurements such as line and load regulation,
dropout voltage, and ground current can be demonstrated with
only a single voltage supply, a voltmeter, an ammeter, and load
resistors.
For full details on the ADP7183 and ADP7185 linear regulators,
see ADP7183 and ADP7185 data sheet, which must be con-
sulted in conjunction with this user guide when using these
evaluation boards.
ADP7183 AND ADP7185 EVALUATION BOARDS
12921-001
Figure 1. ADP7183 and ADP7185 Fixed VOUT Board
12921-002
Figure 2. ADP7183 and ADP7185 Adjustable VOUT Board
UG-795 ADP7183-EVALZ/ADP7185-EVALZ User Guide
Rev. A | Page 2 of 9
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
ADP7183 and ADP7185 Evaluation Boards ................................. 1
Revision History ............................................................................... 2
Evaluation Board Hardware ............................................................ 3
Evaluation Board Configurations .............................................. 3
Voltage, Regulation, and Current Mesurements .......................... 4
Output Voltage Measurements ................................................... 4
Dropout Voltage Measurements..................................................4
Line Regulation Measurements ...................................................5
Load Regulation Measurements ..................................................5
Ground Current Measurements ..................................................6
Evaluation Board Schematics and Artwork ...................................7
Ordering Information .......................................................................9
Bill of Materials ..............................................................................9
REVISION HISTORY
5/2017—Rev. 0 to Rev. A
Added ADP7185 ............................................................ Throughout
Changes to Title, Features Section, and General Description .... 1
Changes to Figure 1 and Figure 2 ................................................... 1
Changes to Figure 5, Load Regulation Measurements Section,
and Figure 6 ....................................................................................... 5
Changes to Ground Current Consumption Section and Figure 8 ... 6
Changed Schematics and Silkscreens Section to Evaluation
Board Schematics and Artwork Section ......................................... 7
Changes to Figure 9 and Figure 10 .................................................. 7
Changes to Table 2 ............................................................................. 9
10/2016—Revision 0: Initial Version
ADP7183-EVALZ/ADP7185-EVALZ User Guide UG-795
Rev. A | Page 3 of 9
EVALUATION BOARD HARDWARE
EVALUATION BOARD CONFIGURATIONS
The ADP7183 and ADP7185 evaluation boards are supplied
with different components, depending on which version (fixed or
adjustable) of the evaluation board is ordered. Components
common to both versions are C1, C2, C3, C4, C5, and JP1. The
R1 and R2 resistors set the output voltage of the adjustable
evaluation board. Figure 9 and Figure 10 show the schematics of
these evaluation board configurations, and Table 1 describes the
hardware components.
The ADP7183 and ADP7185 fixed option uses a −3.3 V output
model. Do not connect R1 and R2 for the fixed output option.
The adjustable output of the ADP7183 and ADP7185 has a
range of −0.5 V to −4.5 V. The output voltage is set by
VOUT = −0.5 V × (1 + R1/R2)
With the values shown in Figure 10, the output voltage is
approximately −2.5 V.
Table 1. Evaluation Board Hardware Components
Component Description
U1 ADP7183 and ADP7185 linear regulators.
For the fixed output option, U1 uses the −3.3 V output option of the ADP7183 and ADP7185.
For the adjustable output option, U1 uses the adjustable option of the ADP7183 and ADP7185 and is set to −2.5 V.
C1 Input bypass capacitor (C
IN
), 4.7 µF, 0805 size.
C2 Regulator capacitor (C
REG
), 1 µF, 0603 size.
C3 Output voltage reference feedback capacitor (C
AFB
), 0.01 µF, 0603 size.
C4 Low noise reference voltage capacitor (C
A
), 1 µF, 0805 size.
C5 Output capacitor (C
OUT
), 4.7 µF, 0805 size.
JP1 Jumper (connects EN to VIN for automatic startup).
R1, R2 Part of the external resistor divider (composed of R1 and R2 that sets the output voltage for the adjustable option).
UG-795 ADP7183-EVALZ/ADP7185-EVALZ User Guide
Rev. A | Page 4 of 9
VOLTAGE, REGULATION, AND CURRENT MESUREMENTS
OUTPUT VOLTAGE MEASUREMENTS
Figure 4 shows how the evaluation boards can be connected to a
voltage source and a voltmeter for basic output voltage accuracy
measurements.
A resistor can be used as the load for the regulator. Ensure that
the resistor has a power rating that is adequate to handle the power
expected to dissipate across it. An electronic load can also be
used as an alternative. Ensure that the voltage source can supply
enough current for the expected load levels.
Follow these steps to connect the evaluation boards to a voltage
source and voltmeter:
1. Connect the positive terminal (+) of the voltage source to
one of the GND pads on the evaluation boards.
2. Connect the negative terminal (−) of the voltage source to
the VIN pad on the evaluation boards.
3. Connect a load between the VOUT pad and one of the
GND pads on the evaluation boards.
4. Connect the positive terminal (+) of the voltmeter to the
VOUT pad on the evaluation boards.
5. Connect the negative terminal (−) of the voltmeter to one
of the GND pads on the evaluation boards.
When these steps are completed, the voltage source can be turned
on. If J1 is inserted (connecting EN to VIN for automatic startup),
the regulator powers up.
If the load current is large, the user must connect the voltmeter as
close as possible to the output capacitor to reduce the effects of
IR drops.
DROPOUT VOLTAGE MEASUREMENTS
Use the configuration shown in Figure 4 to measure the dropout
voltage. The dropout voltage is defined as the input to output
voltage differential when the input voltage is set to the nominal
output voltage. The ADP7183 and ADP7185 enter dropout mode
only for output voltages of at least −2.5 V. For lower voltage
outputs, the ADP7183 and ADP7185 enter undervoltage lockout
(UVLO) and shuts down. The dropout voltage increases with
larger loads.
For accurate measurements, use a second voltmeter to monitor
the input voltage across the input capacitor. The input supply
voltage may need adjusting to account for IR drops, especially
when using large load currents. Figure 3 shows the typical curve
of the dropout voltage measurements with different load currents.
12921-211
–200
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
–1000 –100 –10
DROPOUT VOLTAGE (mV)
LOAD CURRENT (mA)
Figure 3. Dropout Voltage vs. Load Current (ILOAD), VOUT = −3.3 V, TA = 25°C
–
+
VOLTAGE SOURCE
LOAD
–+
VOLTMETER
–3.29999 V
12921-003
Figure 4. Output Voltage Measurement Setup
ADP7183-EVALZ/ADP7185-EVALZ User Guide UG-795
Rev. A | Page 5 of 9
LINE REGULATION MEASUREMENTS
For line regulation measurements, the output of the regulator is
monitored while its input is varied. For optimal line regulation,
the output must change as little as possible with varying input
levels. To ensure that the device is not in dropout mode during
line regulation measurement, VIN must be varied between VOUT −
0.5 V (or −2 V, whichever is greater) and −5.5 V. For example,
for an ADP7183 or ADP7185 with a fixed −3.3 V output, VIN
must vary between −3.8 V and −5.5 V. Note that this measurement
can be repeated under different load conditions. Figure 5 shows
the typical line regulation performance of an ADP7183 or
ADP7185 with a fixed −3.3 V output.
12921-220
–3.40
–3.38
–3.36
–3.34
–3.32
–3.30
–3.28
–3.26
–3.24
–3.22
–5.5 –5.3 –5.1 –4.9 –4.7 –4.5 –4.3 –4.1 –3.9
V
OUT
(V)
V
IN
(V)
NO LOAD
I
LOAD
= –10mA
I
LOAD
= –100 mA
I
LOAD
= –300 mA
I
LOAD
= –500 mA
Figure 5. Output Voltage (VOUT) vs. Input Voltage (VIN) at VOUT = −3.3 V, TA = 25°C
LOAD REGULATION MEASUREMENTS
For load regulation measurements, while the load varies,
monitor the output of the regulator. For optimal load regula-
tion, the output must change as little as possible with varying
loads. Hold the input voltage constant during load regulation
measurement. The load current can be varied from 0 mA to
−300 mA for the ADP7183 and from 0 mA to −500 mA for the
ADP7185. Figure 6 shows the typical load regulation perfor-
mance of an ADP7183 or ADP7185 with a fixed −3.3 V output
for an input voltage of −3.8 V.
VOUT (V)
ILOAD (mA)
–1000 –10–100
–3.369
–3.349
–3.329
–3.309
–3.289
–3.269
–
3.249
12921-219
Figure 6. Output Voltage (VOUT) vs. Load Current (ILOAD) at
VIN = −3.8 V, VOUT = −3.3 V, TA = 25°C
UG-795 ADP7183-EVALZ/ADP7185-EVALZ User Guide
Rev. A | Page 6 of 9
–+
VOLTAGE S OURCE
LOAD
–+
AMMETER
–0.00355 A
12921-007
Figure 7. Ground Current Measurement Setup
GROUND CURRENT MEASUREMENTS
Figure 7 shows how to connect the ADP7183 and ADP7185
evaluation board to a voltage source and an ammeter for ground
current measurements.
Use a resistor as the load for the regulator. Ensure that the resistor
has a power rating that is adequate to handle the power expected
to dissipate across it. As an alternative, use an electronic load.
Ensure that the voltage source can supply enough current for
the expected load levels.
Follow these steps to connect the evaluation board to a voltage
source and ammeter:
1. Connect the negative terminal (−) of the voltage source to
the VIN pad on the evaluation board.
2. Connect the negative terminal (−) of the ammeter to one of
the GND pads of the evaluation board.
3. Connect the positive terminal (+) of the ammeter to the
positive terminal (+) of the voltage source.
4. Connect a load between the positive terminal (+) of the
voltage source and the VOUT pad of the evaluation board.
When these connection steps are completed, turn on the voltage
source. If J1 is inserted (connecting EN to VIN for automatic
startup), the regulator powers up.
Ground Current Consumption
Ground current measurements can determine how much current
the internal circuits of the regulators consume while the circuits
perform the regulation function. To be efficient, the regulators
must consume as little current as possible. Typically, the regulators
use the maximum current when supplying their largest load level
(−300 mA for the ADP7183 and −500 mA for the ADP7185).
Figure 8 shows the typical ground current consumption for the
various load levels at VOUT = −3.3 V and TA = 25°C.
When the device is disabled (EN = GND), the ground current
drops to less than 2 μA.
I
LOAD
(mA)
GROUND CURRENT (mA)
12921-208
–6
–5
–4
–3
–2
–1
0
–500 –450 –400 –350 –300 –250 –200 –150 –100 –50 0
Figure 8. Ground Current vs. Load Current (ILOAD), VOUT = −3.3 V, TA = 25°C
ADP7183-EVALZ/ADP7185-EVALZ User Guide UG-795
Rev. A | Page 7 of 9
EVALUATION BOARD SCHEMATICS AND ARTWORK
Figure 9. ADP7183 and ADP7185 Evaluation Board Fixed Output Schematic
12921-010
TSW-104-08-T-D
ADP7183/ADP7185
TSW-102-08-G-D
DNI
100K
TSW-102-08-G-D
24.9K
1UF
69157-102HLF
4.7UF
DNI
0.01UF
4.7UF 1UF
TSW-104-08-T-D
1UF
TSW-102-08-G-D TSW-102-08-G-D
C4 U1 C2
R1
VOUT
P2
C6
C5
R3
P1
VIN
JP1
R2
P6
C3
C1
P5
TP3
P4P3
VOUT VIN
81
2
3 6
7
PAD
54
11
2
3
5
2
8
7
6
5
4
3
2
1
1
1
4
3
2
1
4
3
2
1
4
3
2
1
1
8
7
6
4
2
1
4
3
VAFB EN
EP
VIN
VREG
GNDVA
SENSE
VOUT
AGND
AGND
AGND
AGND
AGND
AGND AGND
Figure 10. ADP7183 and ADP7185 Evaluation Board Adjustable Output Schematic
UG-795 ADP7183-EVALZ/ADP7185-EVALZ User Guide
Rev. A | Page 8 of 9
12921-260
Figure 11. ADP7183 and ADP7185 Evaluation Board Top Layer
12921-261
Figure 12. ADP7183 and ADP7185 Evaluation Board Bottom Layer
ADP7183-EVALZ/ADP7185-EVALZ User Guide UG-795
Rev. A | Page 9 of 9
ORDERING INFORMATION
BILL OF MATERIALS
Table 2.
Reference
Designator Description Manufacturer Part No.
C1, C5 Capacitors, multilayer ceramic capacitor (MLCC), 4.7 µF, 25 V, 0805, X5R Murata (or equivalent) GRM21BR61E475KA12L
C2 Capacitor, MLCC, 1 µF, 25 V, 0603, X5R Murata (or equivalent) GRM188R61E105KA12D
C3 Capacitor, MLCC, 0.01 µF, 16 V 0603, X7R Murata (or equivalent) GRM188R71C103KA
C4 Capacitor, MLCC, 1 µF, 25 V, 0805, X7R Murata (or equivalent) GCM21BR71E105KA56L
C6 Do not install (DNI) Not applicable Not applicable
JP1 Header/jumper, single, straight, two pins FCI 69157-102HLF
R1 Resistor, 0805, 100 kΩ, 1% tolerance (do not install on the fixed model) Any manufacturer Depends on manufacturer
R2 Resistor, 0805, 24.9 kΩ, 1% tolerance (do not install on the fixed model) Any manufacturer Depends on manufacturer
R3 Do not install (DNI) Not applicable Not applicable
U1 Analog Devices IC, ultralow noise, high PSRR, LDO linear regulators that
include the following devices:
Analog Devices, Inc.
ADP7183-3.3-EVALZ ADP7183ACPZN3.3-R7
ADP7183-ADJ-EVALZ ADP7183ACPZN-R7
ADP7185-3.3-EVALZ ADP7185ACPZN3.3-R7
ADP7185-ADJ-EVALZ ADP7185ACPZN-R7
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement.
This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERM
INATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WA
RRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
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THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be gove
rned by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
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UG12921-0-5/17(A)