LTC2328 [Linear]
18-Bit/16-Bit,1Msps/500ksps/250ksps True Bipolar Low Power, Single Supply ADCs;型号: | LTC2328 |
厂家: | Linear |
描述: | 18-Bit/16-Bit,1Msps/500ksps/250ksps True Bipolar Low Power, Single Supply ADCs |
文件: | 总12页 (文件大小:8260K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
DEMO MANUAL DC1908A
LTC2338/LTC2337/LTC2336/
LTC2328/LTC2327/LTC2326
18-Bit/16-Bit,1Msps/500ksps/250ksps
True Bipolar Low Power, Single Supply ADCs
DESCRIPTION
The LTC®2338/LTC2337/LTC2336/LTC2328/LTC2327/
LTC2326 are true bipolar, low power, low noise ADCs
with serial outputs that can operate from a single 5V
supply. The following text refers to the LTC2338-18 but
applies to all parts in the family, the only difference being
the maximum sample rates and the number of bits. The
LTC2338-18 supports a 2ꢀ.ꢁ8V fully differential input
range with a 1ꢀꢀdB SNR, consumes only 5ꢀmW and
achieves ꢁLSB INL max with no missing codes at 18
bits. The DC19ꢀ8A demonstrates the DC and AC perfor-
mance of the LTC2338-18 in conjunction with the DC59ꢀ
QuikEval™ and DC718 PScope™ data collection boards.
Use the DC59ꢀ to demonstrate DC performance such as
peak-to-peak noise and DC linearity. Use the DC718 if
precise sampling rates are required or to demonstrate AC
performance such as SNR, THD, SINAD and SFDR. The
demonstration circuit 19ꢀ8A is intended to demonstrate
recommended grounding, component placement and
selection, routing and bypassing for this ADC. Suggested
driver circuits for the analog inputs will be presented.
Design files for this circuit board are available at
http://www.linear.com/demo or scan the QR code on
the back of the board.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval, PScope are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
BOARD PHOTO
-16V
GND
+16V
100MHz
Max
3.3Vpp
TO
DC718
AIN+
10.ꢀ2V
AIN-
10.ꢀ2V
TO DC590
Figure 1. DC1908A Connection Diagram
dc1908af
1
DEMO MANUAL DC1908A
ASSEMBLY OPTIONS
Table 1. DC1908A Assembly Options
ASSEMBLY VERSION U1 PART NUMBER MAX CONVERSION RATE # OF BITS MAX CLK FREQUENCY
AIN+ RANGE
1ꢀ.2ꢁV
1ꢀ.2ꢁV
1ꢀ.2ꢁV
1ꢀ.2ꢁV
1ꢀ.2ꢁV
1ꢀ.2ꢁV
1ꢀ.2ꢁV
1ꢀ.2ꢁV
1ꢀ.2ꢁV
AIN– RANGE
1ꢀ.2ꢁV
DC19ꢀ8A-A
DC19ꢀ8A-B
DC19ꢀ8A-C
DC19ꢀ8A-D
DC19ꢀ8A-E
DC19ꢀ8A-F
DC19ꢀ8A-G
DC19ꢀ8A-H
DC19ꢀ8A-I
LTC2338CMS-18
LTC2337CMS-18
LTC2336CMS-18
LTC2328CMS-18
LTC2327CMS-18
LTC2326CMS-18
LTC2328CMS-16
LTC2327CMS-16
LTC2326CMS-16
1Msps
5ꢀꢀksps
25ꢀksps
1Msps
18
18
18
18
18
18
16
16
16
62MHz
31MHz
1ꢀ.2ꢁV
15.5MHz
62MHz
1ꢀ.2ꢁV
Grounded Internally
Grounded Internally
Grounded Internally
Grounded Internally
Grounded Internally
Grounded Internally
5ꢀꢀksps
25ꢀksps
1Msps
31MHz
15.5MHz
5ꢀMHz
5ꢀꢀksps
25ꢀksps
25MHz
12.5MHz
DC718 QUICK START PROCEDURE
Check to make sure that all switches and jumpers are set
as shown in the connection diagram of Figure 1. The de-
fault connections configure the ADC to use the internal
reference. The analog input is DC coupled. Connect the
DC19ꢀ8A to a DC718 USB high speed data collection
board using connector P1. Then, connect the DC718 to
a host PC with a standard USB A/B cable. Apply 16V
to the indicated terminals. Then apply a low jitter signal
Complete software documentation is available from the
Help menu. Updates can be downloaded from the Tools
menu. Check for updates periodically as new features
may be added.
The PScope software should recognize the DC19ꢀ8A and
configure itself automatically.
Click the Collect button (See Figure ꢁ) to begin acquiring
data. The Collect button then changes to Pause, which
can be clicked to stop data acquisition.
source to AIN+ (Jꢁ). Connect a low jitter 62MHz 3.3V
P-P
sine wave or square wave to CLK IN (J1). Note that CLK
IN has a 5ꢀΩ termination resistor to ground.
Run the PScope software (Pscope.exe version K72 or
later) supplied with the DC718 or download it from www.
linear.com/software.
DC590 SETUP
IMPORTANT!To avoiddamagetotheDC1908AorDC590,
make sure that VCCIO (JP6) of the DC590 is set to 3.3V
before connecting the DC590 to the DC1908A.
with a standard USB A/B cable. Connect the DC19ꢀ8A to a
DC59ꢀUSBserialcontrollerusingthesupplied1ꢁ-conduc-
tor ribbon cable. Apply a signal source to AIN+ or AIN+
and AIN– depending on how the DC19ꢀ8A is configured.
Run the QuikEval software supplied with the DC59ꢀ or
download it from www.linear.com/software. The correct
control panel will be loaded automatically. Click the COL-
LECT button (See Figure 5) to begin reading the ADC.
To use the DC59ꢀ with the DC19ꢀ8A, it is necessary to
apply 16V and ground to the +16V, –16V and GND ter-
minals or disable amplifier U1ꢀ by moving R32 and R35
to R31 and R38 respectively. Disabling U1ꢀ will require
that both AIN+ and AIN– (J6) be driven with a low output
impedance signal source. Connect the DC59ꢀ to a host PC
dc1908af
2
DEMO MANUAL DC1908A
DC1908A SETUP
DC Power
appliedatAIN+andfeedittotheADCasshowninFigure3.
To bypass the single-ended-to-differential converter or
buffer, disable amplifier U1ꢀ by moving R32 and R35 to
R31 and R38 respectively. Disabling U1ꢀ will require that
both AIN+ and AIN– be driven with a low output imped-
ance signal source.
The DC19ꢀ8A requires 16VDC and draws approximately
1ꢀꢀmA from the positive supply. Most of this supply cur-
rent is consumed by the CPLD, op amps, regulators and
discrete logic on the board. The +16VDC input voltage
powers the ADC through LT1763 regulators which pro-
vide protection against accidental reverse bias. Additional
regulators provide power for the CPLD and op amps. See
Figure 1 for connection details.
Data Output
Parallel data output from this board (ꢀV to 3.3V default),
if not connected to the DC718, can be acquired by a logic
analyzer, and subsequently imported into a spreadsheet,
or mathematical package depending on what form of
digital signal processing is desired. Alternatively, the
data can be fed directly into an application circuit. Use
CLKOUT (Pin 3) of P1 to latch the data. The data can be
latched using either edge of this signal. The data output
signal levels at P1 can also be reduced to ꢀV to 2.5V if
the application circuit cannot tolerate the higher voltage.
This is accomplished by moving the VCCIO jumper (JP3)
to the 2.5V position.
Clock Source
You must provide a low jitter 3.3V sine or square wave
P-P
to CLK IN. The clock input is AC coupled so the DC level
of the clock signal is not important. A clock source like
the Rohde & Schwarz SMB1ꢀꢀA is recommended. Even
a good generator can start to produce noticeable jitter at
low frequencies. Therefore it is recommended for lower
sample rates to divide down a higher frequency clock to
the desired sample rate. The ratio of clock frequency to
conversion rate is 62:1 for 18-bit parts and 5ꢀ:1 for 16-
bit parts. If the clock input is to be driven with logic, it is
recommended that the 5ꢀΩ terminator (R5) be removed.
Slow rising edges may compromise the SNR of the con-
verter in the presence of high amplitude higher frequency
input signals.
Reference
The default reference is the LTC2338-18 ꢁ.ꢀ96V internal
reference. TheLTC66555Vexternalreferencecanbeused
by adding R37 and moving the REF jumper (JP2) to the
EXT position. This will increase the input range at AIN+
and AIN– to 12.5V. Also, an external reference can be
used by removing R37 and applying a reference voltage
to the VREF (E3) terminal with the REF jumper in the EXT
position. If an external reference is used it must settle
quickly in the presence of glitches on the REF pin. The
Analog Input
The default setup for the DC19ꢀ8A requires that only AIN+
is driven. Versions A, B and C of the DC19ꢀ8A convert the
single-ended signal at AIN+ to a fully-differential signal
that is then fed to the ADC as shown in Figure 2. Single-
ended versions D, E, F, G, H and I simply buffer the signal
analog input range for an external reference is 2.5 ꢂ V
.
REF
Figure 2. Single-Ended to Differential Converter
Figure 3. Single-Ended Buffer
dc1908af
3
DEMO MANUAL DC1908A
DC1908A SETUP
Data Collection
input signal level is approximately –1dBFS. A typical FFT
obtained with DC19ꢀ8A is shown in Figure ꢁ. Note that
to calculate the real SNR, the signal level (F1 amplitude =
–1.ꢀ3ꢀdB) has to be added back to the SNR that PScope
displays. With the example shown in Figure ꢁ this means
that the actual SNR would be 99.5ꢁdB instead of the
98.51dB that PScope displays. Taking the RMS sum of the
recalculated SNR and the THD yields a SINAD of 99.27dB
which is fairly close to the typical number for this ADC.
For SINAD, THD or SNR testing a low noise, low distortion
generator such as the Stanford Research DS36ꢀ should
be used. A low jitter RF oscillator such as the Rohde &
SchwarzSMB1ꢀꢀAisusedastheclocksource. Thisdemo
board is tested in house by attempting to duplicate the
FFT plot shown on the front page of the LTC2338-18 data
sheet. This involves using a 62MHz clock source, along
with a sinusoidal generator at a frequency of 2.ꢀkHz. The
Figure 4. DC1908A PScope Screen Shot
dc1908af
4
DEMO MANUAL DC1908A
DC1908A SETUP
and routing of the various components associated with
the ADC. Here are some things to remember when lay-
ing out a board for the LTC2338-18. A ground plane is
necessarytoobtainmaximumperformance.Keepbypass
capacitors as close to supply pins as possible. Use indi-
vidual low impedance returns for all bypass capacitors.
Use of a symmetrical layout around the analog inputs will
minimize the effects of parasitic elements. Shield analog
input traces with ground to minimize coupling from other
traces. Keep traces as short as possible.
There are a number of scenarios that can produce mis-
leading results when evaluating an ADC. One that is
common is feeding the converter with a frequency, that
is a sub-multiple of the sample rate, and which will only
exercise a small subset of the possible output codes.
The proper method is to pick an M/N frequency for the
input sine wave frequency. N is the number of samples
in the FFT. M is a prime number between one and N/2.
Multiply M/N by the sample rate to obtain the input sine
wave frequency. Another scenario that can yield poor
results is if you do not have a signal generator capable of
ppm frequency accuracy or if it cannot be locked to the
clock frequency. You can use an FFT with windowing to
reduce the “leakage” or spreading of the fundamental, to
get a close approximation of the ADC performance. If an
amplifier or clock source with poor phase noise is used,
the windowing will not improve the SNR.
Component Selection
When driving a low noise, low distortion ADC such as
the LTC2338-18, component selection is important so
as to not degrade performance. Resistors should have
low values to minimize noise and distortion. Metal film
resistors are recommended to reduce distortion caused
by self heating. Because of their low voltage coefficients,
to further reduce distortion NPO or silver mica capacitors
should be used. Any buffer used to drive the LTC2338-18
should have low distortion, low noise and a fast settling
time such as the LT1ꢁ69.
Layout
As with any high performance ADC, this part is sensitive
to layout. The area immediately surrounding the ADC on
theDC19ꢀ8Ashouldbeusedasaguidelineforplacement,
dc1908af
5
DEMO MANUAL DC1908A
DC1980A SETUP
Figure 5. DC1908A QuikEval Screen Shot
DC1980A JUMPERS
Definitions
JP3 – VCCIO sets the output levels at P1 to either 3.3V
or 2.5V. Use 3.3V to interface to the DC718 which is the
default setting.
JP1 – EEPROM For Factory use only. Should be left in
the WP position.
JP2 – REF selects whether the LTC2338-18 internal refer-
ence or an external reference voltage is used. The default
setting is internal.
dc1908af
6
DEMO MANUAL DC1908A
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
12
C1, C2, C3, Cꢁ, C5, C7, C1ꢀ, C13, C1ꢁ,
C15, C16, C56
CAP., X7R, ꢀ.1µF, 16V 1ꢀ% ꢀ6ꢀ3
NIC, NMCꢀ6ꢀ3X7R1ꢀꢁK16TRPF
2
6
2
1
6
ꢀ
ꢀ
1
1
6
3
8
ꢀ
1
1
1
2
2
5
ꢁ
3
3
1
1
ꢁ
1
ꢁ
7
1
2
6
ꢁ
ꢀ
1
1
3
1
1
1
1
2
1
1
1
C6, C9, C2ꢁ, C26, C29, Cꢁ8
CAP., X5R, 1ꢀµF, 6.3V 2ꢀ% ꢀ6ꢀ3
CAP., X7R, 1µF, 16V 1ꢀ% ꢀ6ꢀ3
CAP., X5R, 1ꢀµF, 1ꢀV 2ꢀ% ꢀ6ꢀ3
CAP., X7R, ꢀ.1µF, 25V 2ꢀ% ꢀ6ꢀ3
CAP., OPT, ꢀ6ꢀ3
NIC, NMCꢀ6ꢀ3X5R1ꢀ6M6.3TRPFꢁKF
NIC, NMCꢀ6ꢀ3X7R1ꢀ5K16TRPF
SAMSUNG, CL1ꢀA1ꢀ6MP8NNNC
TDK, C16ꢀ8X7R1E1ꢀꢁM
3
C8, Cꢁ5
ꢁ
C11
5
C12, C17, Cꢁ1, Cꢁ3, C57, C6ꢀ
6
C18, Cꢁ2, Cꢁ7, C58, C61
OPTION
7
C19
CAP., OPT, ꢀ8ꢀ5
OPTION
8
C2ꢀ
CAP., X7R, ꢁ7µF, 1ꢀV 1ꢀ% 121ꢀ
CAP., X5R, 22µF, 25V 2ꢀ% 121ꢀ
CAP., X7R, 1µF, 25V 1ꢀ% ꢀ6ꢀ3
CAP., X7R, ꢀ.ꢀ1µF, 6.3V 1ꢀ% ꢀ6ꢀ3
MURATA, GRM32ER71Aꢁ76KE15L
MURATA, GRM32ER61E226ME15
TDK, C16ꢀ8X7R1E1ꢀ5K
9
C21
1ꢀ
11
12
13
1ꢁ
15
16
17
18
19
2ꢀ
21
22
23
2ꢁ
25
26
27
28
29
3ꢀ
31
32
33
3ꢁ
35
36
37
38
39
ꢁꢀ
ꢁ1
ꢁ2
ꢁ3
ꢁꢁ
C22, C25, C28, Cꢁꢁ, C51, C5ꢁ
C23, C27, C3ꢀ
MURATA, GRM188R7ꢀJ1ꢀ3KAꢀ1D
NIC, NMCꢀꢁꢀ2X7R1ꢀꢁK16TRPF
OPTION
C31, C32, C33, C3ꢁ, C35, C36, C37, C38 CAP., X7R, ꢀ.1µF, 16V 1ꢀ% ꢀꢁꢀ2
C39, Cꢁꢀ
CAP., OPT, 12ꢀ6
Cꢁ6
CAP., X5R, 2.2µF, 1ꢀV 1ꢀ% ꢀ6ꢀ3
CAP., NPꢀ, 1ꢀꢀpF, 25V 1ꢀ% ꢀ6ꢀ3
CAP., X7R, ꢀ.ꢀ1µF, 25V 1ꢀ% ꢀ6ꢀ3
CAP., X5R, 1ꢀµF, 25V 1ꢀ% ꢀ8ꢀ5
CAP., X5R, 1µF, 5ꢀV 1ꢀ% ꢀ6ꢀ3
TEST POINT, TURRET, ꢀ.ꢀ61
TEST POINT, TURRET, ꢀ.ꢀ9ꢁ, PBF
3-PIN SINGLE ROW HEADER, .1ꢀꢀ
CONNECTOR, BNC
MURATA, GRM188R61A225KE3ꢁD
AVX, ꢀ6ꢀ33A1ꢀ1KATꢁA
Cꢁ9
C5ꢀ
MURATA, GRM188R71E1ꢀ3KAꢀ1D
MURATA, GRM21BR61E1ꢀ6KA73L
TDK, C16ꢀ8X5R1H1ꢀ5KT
MILL-MAX, 23ꢀ8-2-ꢀꢀ-8ꢀ-ꢀꢀ-ꢀꢀ-ꢀ7-ꢀ
MILL- MAX, 25ꢀ1-2-ꢀꢀ-8ꢀ-ꢀꢀ-ꢀꢀ-ꢀ7-ꢀ
SAMTEC, TSW-1ꢀ3-ꢀ7-L-S
CONNEX, 112ꢁꢀꢁ
C52, C53
C55, C59
E1, E2, Eꢁ, E5, E9
E3, E6, E7, E8
JP1, JP2, JP3
J1, Jꢁ, J6
J3
HEADER, 2X7, ꢀ.ꢀ79"
MOLEX, 87831-1ꢁ2ꢀ
J5
HEADER, 2X5, ꢀ.1ꢀꢀ"
SAMTEC, TSW-1ꢀ5-ꢀ7-L-D
KEYSTONE, 8831 (SNAP ON)
SAMTEC, TSW-12ꢀ-ꢀ7-L-D
PANASONIC, ERJ-3GEYJ33ꢀV
YAGEO, RCꢀ6ꢀ3JR-ꢀ71KL
VISHAY, CRCW12ꢀ6ꢁ9R9FKEA
YAGEO, RCꢀ6ꢀ3JR-ꢀ71KL
PANASONIC, ERJ-3GEYꢀRꢀꢀV
PANASONIC, ERJ-3EKFꢁ991V
OPTION
MH1, MH2, MH3, MHꢁ
STANDOFF, NYLON ꢀ.25"
P1
CONNECTOR, ꢁꢀ PINS, SMT
R1, R3, Rꢁ, R8
RES., CHIP, 33Ω, 1/1ꢀW, 5% ꢀ6ꢀ3
RES., CHIP, 1k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, ꢁ9.9Ω, 1/ꢁW, 1% 12ꢀ6
RES., CHIP, 1k, 1/1ꢀW, 5% ꢀ6ꢀ3
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RES., CHIP, ꢁ.99k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, OPT, ꢀ6ꢀ3
R2, R6, R19, R2ꢁ, R29, Rꢁ3, Rꢁ5
R5
R7, R13
R9, R1ꢁ, R32, R33, R36, R39
R1ꢀ, R11, R12, Rꢁꢀ
R15, R31, R3ꢁ, R37, R38
R17
RES., CHIP, 2k, 1/1ꢀW, 5% ꢀ6ꢀ3
RES., CHIP, 2ꢁ9Ω, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 1k, 1/16W, 5% ꢀꢁꢀ2
RES., CHIP, 1ꢀk, 1/16W, 5% ꢀ6ꢀ3
RES., CHIP, 1.69k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 1.5ꢁk, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 2.8k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 11.5k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 1ꢀk, 1/16W, 5% ꢀꢁꢀ2
RES., CHIP, 6.19k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 33Ω, 1/16W, 5% ꢀꢁꢀ2
PANASONIC, ERJ-3GEYJ2ꢀ2V
YAGEO, RCꢀ6ꢀ3FR-ꢀ72ꢁ9RL
YAGEO, RCꢀꢁꢀ2JR-ꢀ71KL
AAC, CR16-1ꢀ3JM
R18
R2ꢀ, R22, R23
R21
R25
PANASONIC, ERJ-3EKF1691V
YAGEO, RCꢀ6ꢀ3FR-ꢀ71K5ꢁL
YAGEO, RCꢀ6ꢀ3FR-ꢀ72K8L
YAGEO, RCꢀ6ꢀ3FR-ꢀ711K5L
AAC, CRꢀ5-1ꢀ3JM
R26
R27
R28, Rꢁ2
R3ꢀ
Rꢁ6
Vishay, CRCWꢀ6ꢀ36K19FKEA
PANASONIC, ERJ-2GEJ33ꢀX
Rꢁ7
dc1908af
7
DEMO MANUAL DC1908A
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
FAIRCHILD, NC7SVUꢀꢁP5X
ꢁ5
2
1
3
1
1
2
1
1
1
1
1
1
3
1
1
U2, Uꢁ
IC, UNBUFFERED INVERTER, SC7ꢀ-5
IC, D FLIP-FLOP, US8
ꢁ6
U3
ON SEMI., NL17SZ7ꢁUSG
ꢁ7
U5, U13, U16
IC, MICROPOWER REGULATOR, SO-8
IC, SINGLE SPST BUS SWITCH, SC7ꢀ-5
IC, SERIAL EEPROM, TSSOP
IC, UHS INVERTER, SC7ꢀ-5
LINEAR TECH., LT1763CS8#PBF
FAIRCHILD, NC7SZ66P5X
ꢁ8
U6
ꢁ9
U7
MICROCHIP, 2ꢁLCꢀ2ꢁ-I/ST
5ꢀ
U8, U9
FAIRCHILD, NC7SZꢀꢁP5X
51
U1ꢀ
IC, DUAL OP-AMP
LINEAR TECH., LT1ꢁ69CS8#PBF
ALTERA, EPM2ꢁꢀGT1ꢀꢀC5N
LINEAR TECH., LT1763CS8-1.8#PBF
LINEAR TECH., LT1763CS8-5#PBF
LINEAR TECH., LTC6655BHMS8-5#PBF
52
U11
IC, MAX II CPLD, TQFP1ꢀꢀ
53
U12
IC, MICROPOWER REGULATOR, SO-8
IC, MICROPOWER REGULATOR, SO-8
IC, VOLTAGE REFERENCE, MSOP
5ꢁ
U1ꢁ
55
U15
56
U17
IC, MICROPOWER NEG. REGULATOR, SOT-23 LINEAR TECH., LT196ꢁES5-SD#PBF
57
XJP1, XJP2, XJP3
SHUNT, ꢀ.1ꢀꢀ
SAMTEC, SNT-1ꢀꢀ-BK-G
STENCIL 19ꢀ8A
58
STENCIL SET (TOP & BOTTOM)
FAB, PRINTED CIRCUIT BOARD
59
DEMO CIRCUIT 19ꢀ8A (REV2)
DC1908A-A
1
1
1
ꢀ
1
1
1
1
GENERAL BOM
DC19ꢀ8A
2
U1
LOW POWER, LOW NOISE ADC
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2338CMS-18
OPTION
3
R16
R35
Rꢁ1
Rꢁꢁ
ꢁ
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RES., CHIP, ꢁ.99k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 3ꢀꢀΩ, 1/16W, 5% ꢀꢁꢀ2
FAB, PRINTED CIRCUIT BOARD
PANASONIC, ERJ-3GEYꢀRꢀꢀV
PANASONIC, ERJ-3EKFꢁ991V
YAGEO, RCꢀꢁꢀ2JR-ꢀ73ꢀꢀRL
DEMO CIRCUIT 19ꢀ8A
5
6
7
DC1908A-B
1
1
1
ꢀ
1
1
1
1
GENERAL BOM
DC19ꢀ8A
2
U1
LOW POWER, LOW NOISE ADC
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2337CMS-18
OPTION
3
R16
R35
Rꢁ1
Rꢁꢁ
ꢁ
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RES., CHIP, ꢁ.99k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 3ꢀꢀΩ, 1/16W, 5% ꢀꢁꢀ2
FAB, PRINTED CIRCUIT BOARD
PANASONIC, ERJ-3GEYꢀRꢀꢀV
PANASONIC, ERJ-3EKFꢁ991V
YAGEO, RCꢀꢁꢀ2JR-ꢀ73ꢀꢀRL
DEMO CIRCUIT 19ꢀ8A
5
6
7
DC1908A-C
1
1
1
ꢀ
1
1
1
1
GENERAL BOM
DC19ꢀ8A
2
U1
LOW POWER, LOW NOISE ADC
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2336CMS-18
OPTION
3
R16
R35
Rꢁ1
Rꢁꢁ
ꢁ
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RES., CHIP, ꢁ.99k, 1/1ꢀW, 1% ꢀ6ꢀ3
RES., CHIP, 3ꢀꢀΩ, 1/16W, 5% ꢀꢁꢀ2
FAB, PRINTED CIRCUIT BOARD
PANASONIC, ERJ-3GEYꢀRꢀꢀV
PANASONIC, ERJ-3EKFꢁ991V
YAGEO, RCꢀꢁꢀ2JR-ꢀ73ꢀꢀRL
DEMO CIRCUIT 19ꢀ8A
5
6
7
DC1908A-D
1
2
3
ꢁ
5
1
1
1
ꢀ
ꢀ
GENERAL BOM
DC19ꢀ8A
U1
LOW POWER, LOW NOISE ADC
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2328CMS-18
PANASONIC, ERJ-3GEYꢀRꢀꢀV
OPTION
R16
R35
Rꢁ1
RE., CHIP, OPT, ꢀ6ꢀ3
OPTION
dc1908af
8
DEMO MANUAL DC1908A
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
6
1
1
Rꢁꢁ
RES., CHIP, 3ꢀꢀΩ, 1/16W, 5% ꢀꢁꢀ2
FAB, PRINTED CIRCUIT BOARD
YAGEO, RCꢀꢁꢀ2JR-ꢀ73ꢀꢀRL
DEMO CIRCUIT 19ꢀ8A
7
DC1908A-E
1
1
1
1
ꢀ
ꢀ
1
1
GENERAL BOM
DC19ꢀ8A
2
U1
LOW POWER, LOW NOISE ADC
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2327CMS-18
PANASONIC, ERJ-3GEYꢀRꢀꢀV
OPTION
3
R16
R35
Rꢁ1
Rꢁꢁ
ꢁ
5
RE., CHIP, OPT, ꢀ6ꢀ3
OPTION
6
RES., CHIP, 3ꢀꢀΩ, 1/16W, 5% ꢀꢁꢀ2
FAB, PRINTED CIRCUIT BOARD
YAGEO, RCꢀꢁꢀ2JR-ꢀ73ꢀꢀRL
DEMO CIRCUIT 19ꢀ8A
7
DC1908A-F
1
1
1
1
ꢀ
ꢀ
1
1
GENERAL BOM
DC19ꢀ8A
2
U1
LOW POWER, LOW NOISE ADC
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2326CMS-18
PANASONIC, ERJ-3GEYꢀRꢀꢀV
OPTION
3
R16
R35
Rꢁ1
Rꢁꢁ
ꢁ
5
RE., CHIP, OPT, ꢀ6ꢀ3
OPTION
6
RES., CHIP, 3ꢀꢀΩ, 1/16W, 5% ꢀꢁꢀ2
FAB, PRINTED CIRCUIT BOARD
YAGEO, RCꢀꢁꢀ2JR-ꢀ73ꢀꢀRL
DEMO CIRCUIT 19ꢀ8A
7
DC1908A-G
1
1
1
1
ꢀ
ꢀ
1
1
GENERAL BOM
DC19ꢀ8A
2
U1
LOW POWER, LOW NOISE ADC
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2328CMS-16
PANASONIC, ERJ-3GEYꢀRꢀꢀV
OPTION
3
R16
R35
Rꢁ1
Rꢁꢁ
ꢁ
5
RE., CHIP, OPT, ꢀ6ꢀ3
OPTION
6
RES., CHIP, ꢀꢁꢀ2
OPTION
7
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 19ꢀ8A
DC1908A-H
1
1
1
1
ꢀ
ꢀ
1
1
GENERAL BOM
DC19ꢀ8A
2
U1
LOW POWER, LOW NOISE ADC
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2327CMS-16
PANASONIC, ERJ-3GEYꢀRꢀꢀV
OPTION
3
R16
R35
Rꢁ1
Rꢁꢁ
ꢁ
5
RE., CHIP, OPT, ꢀ6ꢀ3
OPTION
6
RES., CHIP, ꢀꢁꢀ2
OPTION
7
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 19ꢀ8A
DC1908A-I
1
2
3
ꢁ
5
6
7
1
1
1
ꢀ
ꢀ
1
1
GENERAL BOM
DC19ꢀ8A
U1
LOW POWER, LOW NOISE ADC
RES., CHIP, ꢀΩ, 1/1ꢀW, ꢀ6ꢀ3
RE., CHIP, OPT, ꢀ6ꢀ3
LINEAR TECH., LTC2326CMS-16
PANASONIC, ERJ-3GEYꢀRꢀꢀV
OPTION
R16
R35
Rꢁ1
Rꢁꢁ
RE., CHIP, OPT, ꢀ6ꢀ3
OPTION
RES., CHIP, ꢀꢁꢀ2
OPTION
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 19ꢀ8A
dc1908af
9
DEMO MANUAL DC1908A
SCHEMATIC DIAGRAM
dc1908af
10
DEMO MANUAL DC1908A
SCHEMATIC DIAGRAM
dc1908af
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
DEMO MANUAL DC1908A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstrationboard(DEMOBOARD)kitbeingsoldorprovidedbyLinearTechnologyisintendedforuseforENGINEERINGDEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 3ꢀ days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-
tion engineer.
Mailing Address:
Linear Technology
163ꢀ McCarthy Blvd.
Milpitas, CA 95ꢀ35
Copyright © 2ꢀꢀꢁ, Linear Technology Corporation
dc1908af
LT 0713 • PRINTED IN USA
LinearTechnology Corporation
163ꢀ McCarthy Blvd., Milpitas, CA 95ꢀ35-7ꢁ17
12
●
●
LINEAR TECHNOLOGY CORPORATION 2013
(ꢁꢀ8) ꢁ32-19ꢀꢀ FAX: (ꢁꢀ8) ꢁ3ꢁ-ꢀ5ꢀ7 www.linear.com
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