DEMO MANUAL DC2290A
LTC2387/LTC2386/LTC2385
18-/16-Bit, 15Msps/10Msps/5Msps,
High Speed SAR ADCs
Description
Demonstration circuit 2290A features the
LTC
®
2387
family.
With up to 15Msps, these differential input, single channel,
18-/16-Bit, serial, high speed successive approximation
register (SAR) ADCs are available in a 32-Pin QFN package.
The LTC2387 family has an internal 20ppm/°C reference
and a serial LVDS interface. The following text refers to
the LTC2387 but applies to all members of the family, the
only difference being the sample rate and the number of
bits. The DC2290A demonstrates the AC performance of
the LTC2387 in conjunction with the DC718 data collection
board. Differential amplifier demo boards are available
separately that provide amplification of low level differ-
ential signals if required (see Table 2). Alternatively, by
connecting the DC2290A into a customer application the
performance of the LTC2387 can be evaluated directly in
that circuit.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2290A
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
BoarD photo
6VDC
POWER SUPPLY
CLOCK SIGNAL
FROM GENERATOR
SIGNAL
GENERATOR
TO DC718
Figure 1. DC2290A Connection Diagram
dc2290afb
1
DEMO MANUAL DC2290A
Dc718 Quick start proceDure
Connect the DC2290A to a DC718 USB High Speed Data
Collection Board using edge connector J1. Connect the
DC718 to a host PC with a standard USB A/B cable. Apply
a low noise differential signal to J6 (A
IN+
) and J5 (A
IN–
).
Note that the DC2290A requires a differential input signal
of approximately 8.192V peak-to-peak to reach 0dBFS. If a
differential signal source of this amplitude is not available
use one of the recommended differential amplifier demo
boards available to increase the signal level. For a clock
source, apply a low jitter 10dBm sine wave or square wave
to connector J4. See Table 1 for maximum clock frequen-
Table 1. DC2290A Assembly Options
VERSION
DC2290A-A
DC2290A-B
DC2290A-C
DC2290A-D
DC2290A-E
DC2290A-F
U1 PART NUMBER
LTC2387CUH-18#PBF
LTC2387CUH-16#PBF
LTC2386CUH-18#PBF
LTC2386CUH-16#PBF
LTC2385CUH-18#PBF
LTC2385CUH-16#PBF
MAX CONVERSION RATE
15Msps
15Msps
10Msps
10Msps
5Msps
5Msps
# OF BITS
18
16
18
16
18
16
MAX CLOCK FREQUENCY
15MHz
15MHz
10MHz
10MHz
5MHz
5MHz
cies. Note that J4 has a 50Ω termination resistor to ground.
Run the PScope™ software (Pscope.exe version K73 or
later) supplied with DC718 or download it from
www.
linear.com/software.
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 DC2290A and configure itself automatically.
Click the Collect button (Figure 2) to begin acquiring data.
The Collect button then changes to Pause, which can be
used to stop data acquisition.
harDware setup
SIGNAL CONNECTIONS
J2:
JTAG. Factory use only.
J3:
FPGA Program. Factory use only.
J4:
CLK IN. This input has a 50Ω termination resistor,
and is intended to be driven by a low jitter, 10dBm sine
or square wave. To achieve full AC performance of this
part, the clock jitter should be kept under 2ps
RMS
. This
input is capacitively coupled so that the input clock can
be either 0V to 3.3V or ±1.65V. This eliminates the need
for level shifting. To run at the maximum conversion rate,
apply the frequency specified in Table 1.
J5:
A
IN–
Input. This is the negative signal input.
J6:
A
IN+
Input. This is the positive signal input.
JUMPERS
JP1:
EEPROM. Factory use only.
JP2:
Lanes. Use this jumper to select either single lane or
two lane data output mode from the LTC2387. The default
setting is 1. The 1 setting clocks out all data on pin DA of
the LTC2387. The 2 setting clocks out data alternately on
pins DA and DB of the LTC2387.
JP3:
Test Pattern. Use this jumper to deliver a fixed repeat-
ing test pattern from the LTC2387. The default setting is
OFF. The output data will be –97796 if the jumper is in
the ON position in 1 lane mode, and will be –52996 in 2
lane mode.
JP4:
ADC ON. Use this jumper to enable or disable the
ADC. The default setting is ON.
2
dc2290afb
DEMO MANUAL DC2290A
harDware setup
Figure 2. DC2290A PScope Screenshot
Table 2. DC2290A (LTC2387 Family) Driver Board
INPUT FREQUENCY
Up to 10kHz
Up to 1MHz
> 1MHz
DRIVE BOARD
DC2402
DC2403
Contact Factory
AMPLIFIER
LT6237
LT6200
Contact Factory
dc2290afb
3
DEMO MANUAL DC2290A
parts List
ITEM
DC2290A
Required Circuit Components
1
2
3
4
5
6
7
8
9
3
4
7
5
1
2
1
1
33
C7, C41, C42
C9, C13, C16, C21
C32, C37, C47, C59, C64, C68, C77
C31, C51, C66, C69, C71
C40
C5, C97
C90
C8
C1, C2, C3, C4, C12, C14, C15, C17,
C18, C19, C20, C22, C24, C26, C27,
C28, C29, C30, C33, C34, C35, C36,
C38, C43, C44, C45, C46, C49, C55,
C56, C57, C58, C98
C23, C54, C63, C67, C87
C25, C48, C65, C70
C10, C11
C74
C76
C95
C6, C52, C53, C60, C80, C96, C99
C73, C75
E1, E2, E3, E4, E5, E6, E7, E8
E9, E10
J1
J2, J3
J5, J6
J4
JP1, JP2, JP3, JP4
L1, L2, L3, L5
R44
R71
R38, R45, R46, R55, R57, R72
R1, R2, R3, R4, R5, R7, R8, R14,
R15,R16, R17, R18, R19, R20, R21,
R23, R25, R68, R69
R32, R36, R37
R29, R30, R31, R35
R49, R50
R41
R6, R9, R10, R12, R13, R53, R54, R70
R22, R24, R26
R27, R39, R40
CAP., X5R, 0.022µF, 25V, 10%, 0402
CAP., NPO, 10pF, 50V, 5%, 0402
CAP., X7R, 10µF, 6.3V, 10%, 0805
CAP., X7R, 1µF, 10V, 10%, 0603
CAP., X5R, 3.3µF, 10V, 10%, 06035
CAP., X5R, 47µF, 6.3V, 20%, 0805
CAP., X5R, 22µF, 16V, 20%, 1210
CAP., X5R, 0.0047µF, 25V, 10%, 0402
CAP., X5R, 0.1µF, 10V, 10%, 0402
AVX, 04023A100KAT2A
AVX, 08056C106KAT2A
AVX, 0603ZC105KAT2A
C1608X5R1A335K
TAIYO YUDEN, JMK212BJ476MG-T
AVX, 1210YD226MAT2A
AVX, 04023D472KAT2A
AVX, 0402ZD104KAT2A
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
5
4
2
0
1
1
7
2
8
2
1
2
2
1
4
4
1
1
0
19
CAP., X7R, 0.1µF, 16V, 10%, 0603
CAP., X7R, 0.01µF, 6.3V, 10%, 0603
CAP., X5R, 0.01µF, 25V, 10%, 0402
CAP, DNI, 0603
CAP., X7R, 2.2µF, 10V, 10%, 0603
CAP., X7R, 0.0022µF, 50V, 10%, 0402
CAP., X5R, 4.7µF, 10V, 10%, 0603
CAP., NPO, 82pF, 25V, 10%, 0603
TEST POINT, TURRET, .064"
TEST POINT, TURRET, .094"
HEADER, 20
×
2, 0.1IN, STRAIGHT_PINS
HEADER, 2
×
5, 0.100"
CONN, SMA, 50Ω, EDGE-LAUNCH, FEMALE
CONN BNC FEM JACK PC MNT STRGHT
HEADER, 1
×
3, 0.100"
FERRITE BEAD, 33Ω, 0603
RES., 0Ω, 1/10W, 0603
RES., 0Ω, 1/10W, 0402
RES, DNI, 0603
RES., 33Ω, 1/10W, 5%, 0402
NIC, NMC0603X7R104K16TRPF
MURATA, GRM188R70J103KA01D
AVX, 04023D103MAT2A
AVX, 0603ZC225KAT2A
AVX 0603ZD475KAT2A
AVX, 06033A820KAT2A
MILL MAX, 2308-2-00-80-00-00-07-0
MILL-MAX, 2501-2-00-80-00-00-07-0
SAMTEC, TSW-120-07-L-D
SAMTEC, TSW-105-07-L-D
E.F. JOHNSON, 142-0701-851
AMPHENOL CONNEX, 112404
SAMTEC, TSW-103-07-L-S
MURATA, BLM18PG330SN1L
PANASONIC, ERJ-3GEY0R00V
PANASONIC, ERJ-2GEY0R00V
YAGEO, RC0402JR-0733RL
30
31
32
33
34
35
36
3
4
2
1
7
3
3
RES., 33Ω, 1/10W, 5%, 0603
RES., 100Ω, 1/10W, 1%, 0201
RES., 10.0Ω, 1/10W, 1%, 0603
RES., 49.9Ω, 1/10W, 1%, 1206
RES., 10k, 1/10W, 5%, 0402
RES., 4.99k, 1/10W, 5%, 0603
RES.,1.00k, 1/10W, 5%, 0603
YAGEO, RC0603JR-0733RL
YAGEO, RC201FR-07101L
PANASONIC, ERJ-3EKF10R0V
PANASONIC, ERJ-8ENF49R9V
PANASONIC, ERJ-2GEYJ103V
PANASONIC, ERJ-3GEYJ4991V
PANASONIC, ERJ-3GEYJ102V
dc2290afb
4
DEMO MANUAL DC2290A
parts List
ITEM
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
DC2290A-A
1
2
3
DC2290A-B
1
2
3
DC2290A-C
1
2
3
DC2290A-D
1
2
3
DC2290A-E
1
2
3
DC2290A-F
1
2
3
1
0
1
R34
R33
U10
RES.,1.00k, 1/10W, 5%, 0402
RES.,DNI, 0402
I.C., SAR ADC, QFN32UH-5×5
LINEAR TECH., LTC2385CUH-16#PBF
PANASONIC, ERJ-2GEYJ102V
0
1
1
R34
R33
U10
RES, DNI, 0402
RES.,1.00k, 1/10W, 5%, 0402
I.C., SAR ADC, QFN32UH-5×5
PANASONIC, ERJ-2GEYJ102V
LINEAR TECH., LTC2385CUH-18#PBF
1
0
1
R34
R33
U10
RES.,1.00k, 1/10W, 5%, 0402
RES.,DNI, 0402
I.C., SAR ADC, QFN32UH-5×5
LINEAR TECH., LTC2386CUH-16#PBF
PANASONIC, ERJ-2GEYJ102V
0
1
1
R34
R33
U10
RES, DNI, 0402
RES.,1.00k, 1/10W, 5%, 0402
I.C., SAR ADC, QFN32UH-5×5
PANASONIC, ERJ-2GEYJ102V
LINEAR TECH., LTC2386CUH-18#PBF
1
0
1
R34
R33
U10
RES.,1.00k, 1/10W, 5%, 0402
RES.,DNI, 0402
I.C., SAR ADC, QFN32UH-5×5
LINEAR TECH., LTC2387CUH-16#PBF
PANASONIC, ERJ-2GEYJ102V
0
1
1
R34
R33
U10
RES, DNI, 0402
RES.,1.00k, 1/10W, 5%, 0402
I.C., SAR ADC, QFN32UH-5×5
PANASONIC, ERJ-2GEYJ102V
LINEAR TECH., LTC2387CUH-18#PBF
QTY
1
1
1
1
1
1
1
1
1
2
1
1
1
1
6
4
REFERENCE
R11
R28
D1, D2, D3, D4
U1
U2
U3
U4
U5
U11
U8, U12
U9
U13
U14
U17
SHOWN ON ASSY DWG
MH1-MH4
PART DESCRIPTION
RES.,1.00k, 1/10W, 5%, 0402
RES.,1.43k, 1/10W, 1%, 0603
DIODE, SCHOTTKY 30V, 200MW, SOD323
IC, CONFIG DEVICE 4MBIT, SO8
IC, EEPROM 2KBIT 400kHz, TSSOP8
IC, CYCLONE III FPGA 5k, EQFP144
IC, MICROPOWER REGULATOR, SO8
IC, LINEAR REGULATOR, SO8
IC, INVERTER UHS SINGLE SC70-5
IC, MICROPOWER REGULATOR, SO8
IC, FLIP FLOP D-TYPE LOG, US8
IC, MICROPOWER REGULATOR, SO8
IC, VOLTAGE REFERENCE, MSOP8
IC, OP-AMP, TSOT23-5
SHUNT, 0.100
STANDOFF, NYLON 0.25"
MANUFACTURER/PART NUMBER
PANASONIC, ERJ-2GEYJ102V
PANASONIC, ERJ-3EKF1431V
DIODE INC., BAT54WS-7-F
ALTERA, EPCS4SI8N
MICROCHIP, 24LC024-I/ST
ALTERA, EP3C5E144C7N
LINEAR TECH., LT1763CS8#PBF
LINEAR TECH., LT3021ES8-1.2#PBF
FAIRCHILD, NC7SZ04P5X
LINEAR TECH., LT1763CS8-2.5#PBF
ON SEMI., NL17SZ74USG
LINEAR TECH., LT1763CS8-5#PBF
LINEAR TECH., LTC6655BHMS8-4.096#PBF
LINEAR TECH., LT6202CS5#PBF
SAMTEC, SNT-100-BK-G
KEYSTONE, 8831 (SNAP ON)
dc2290afb
5
京公网安备 11010802033920号
EEWORLD
