DEMO MANUAL DC1796A
LTC6360
Driving 18-Bit SAR ADC
Description
The LTC®6360 is a very low noise, high precision, high
speed amplifier, suitable for driving SAR ADCs. The
LTC6360 features a total output noise of 2.3nV/√Hz combined with 150ns settling time to 16-bit levels (A V = 1).
While powered from a single 5V supply, the amplifier output
can swing to 0V while maintaining high linearity. This is
made possible with the inclusion of a very low noise onchip charge pump that generates a negative voltage to bias
the output stage of the amplifier, increasing the allowable
negative voltage swing. The LTC2370/LTC2369/LTC2368/
LTC2367/LTC2364 are low power, low noise ADCs with
serial outputs that can operate from a single 2.5V supply.
Demonstration circuit 1796A demonstrates the DC and
AC performance of the LTC6360 driving the LTC2369-18
in conjunction with the DC590B QuikEval™ and DC718
fast DAACS data collection boards. Use the DC590B 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
1796A is intended to demonstrate recommended grounding, component placement and selection, routing and
bypassing for the LTC6360 and the ADC.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval and PScope are trademarks of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
Board Photo
GND
9V TO 10V
CLKIN
100MHz Max
3.3VP-P Max
TO DC718
AIN+/AIN–
TO DC590
dc1796a F01
Figure 1. Demo Circuit 1796A
dc1796af
1
DEMO MANUAL DC1796A
Assembly Options
Table 1. DC1796A Assembly Options
ASSEMBLY VERSION
U1 PART NUMBER
MAX CONVERSION RATE
NUMBER OF BITS
MAX CLKIN FREQUENCY
DC1796A-A
LTC2370CMS-16
2Msps
16
100MHz
DC1796A-B
LTC2368CMS-16
1Msps
16
50MHz
DC1796A-C
LTC2367CMS-16
0.5Msps
16
25MHz
DC1796A-D
LTC2364CMS-16
0.25Msps
16
12.5MHz
DC1796A-E
LTC2369CMS-18
1.6Msps
18
99.2MHz
DC1796A-F
LTC2368CMS-18
1Msps
18
62MHz
DC1796A-G
LTC2367CMS-18
0.5Msps
18
31MHz
DC1796A-H
LTC2364CMS-18
0.25Msps
18
15.5MHz
Quick Start Procedure
This board is tested by measuring the distortion at
–1dBFS, 2kHz single-ended input, as shown in Figure 2.
A low noise, low distortion generator such as Audio Precision SYS-2722, B&K Type 1051 or Stanford Research
DS360, should be used for SINAD, THD or SNR testing.
A low jitter RF oscillator, such as the Marconi Instruments
Multisource Generator 2026, should be used as the clock
source.
To test the boards follow the steps below:
1. Make sure that all the jumpers are set as shown in
Figure 2 (DC1796A test diagram).
2. Power up the board by applying +9VDC.
3. Apply the clock signal to connector J1. Set the clock
frequency to 99.2MHz (to achieve a 1.6Msps conver-
sion rate for an 18-bit SAR ADC). Refer to the Clock
Source section for more detailed information. Set the
clock amplitude to 3.3VPP.
4. For best SNR measurement data, a 2.3kHz cutoff frequency lowpass filter is used in the input signal at J2.
See the Analog Input section for more details.
5. Apply a 2kHz, –1dBFS signal to connector J2. There are
several ways of level shifting the input signal. In this
case, the VREF /2 turret on the demo board was used to
provide level shifting of the input signal. VREF /2 should
be properly bypassed to ground to minimize noise on
the input signal.
The performance that results from these connections is
displayed in Figure 7.
dc1796af
2
DEMO MANUAL DC1796A
quick start procedure
dc1796a F02
Figure 2. DC1796A Test Diagram
DC718 Setup
Connect the DC1796A to a DC718 USB high speed data
collection board using connector J3. Then, connect the
DC718 to a host PC with a standard USB A/B cable. Apply +9V to the indicated terminals. Run the QuikEval II
software (pscope.exe version K72, or later) supplied with
the DC718, or download it from www.linear.com.
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 DC1796A
and configure itself automatically.
Click the Collect button (See Figure 7) to begin acquiring
data. The Collect button then changes to Pause, which
can be clicked to stop data acquisition.
dc1796af
3
DEMO MANUAL DC1796A
DC590B Setup
IMPORTANT! To avoid damage to the DC1796A, make
sure that VCCIO (JP5) is set to 3.3V before connecting
the DC590B to the DC1796A.
Connect the DC590B to a host PC with a standard USB
A/B cable. Connect the DC1796A to a DC590B USB serial
controller using the supplied 14-conductor ribbon cable.
Run the evaluation software supplied with the DC590B,
or download it from www.linear.com.
The correct control panel will be loaded automatically.
Click the Collect button to begin reading the ADC (see
Figure 8).
DC1796A Setup
DC Power
Analog Input
The DC1796A requires +9VDC and draws about 60mA.
Most of the supply current is consumed by the CPLD,
regulators and discrete logic on the board. The +9VDC
input voltage powers the LTC6360 and the ADC through
LT1763 regulators, which provide protection against accidental reverse bias. Additional regulators provide power
for the CPLD.
The default driver configuration of the DC1796A is shown
in Figure 3. This circuit buffers a single-ended 0V to 4V
input signal applied at AIN+.
Clock Source
For better distortion, the feedback impedance R22 should
be matched to the source impedance. Impedance matching negates the effects of input bias current. However, no
impedance matching was used for the results provided
in Figure 7, for simplicity of measurements.
Provide a low jitter 3.3VP-P sine or square wave to J1.
The clock input is AC-coupled, so the DC level of the
clock signal is not important. A low jitter RF oscillator,
such as the Marconi Instruments Multisource Generator
2026, 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 50:1 for 16-bit parts. If the clock input
is to be driven with logic, it is recommended that the
50Ω terminator (R6) be removed. Slow rising edges may
compromise the SNR of the converter in the presence of
high amplitude, higher frequency input signals.
Audio Precision SYS-2722 has a 40Ω source input impedance in the configuration used. Adding another 5Ω
(a total of 45Ω) with a C = 1.5µF to GND in a simple RC
filter fixture off the board creates a lowpass filter with a
2.3kHz cutoff frequency. This filter is not added on the
board due to various input frequencies that the user might
select. It is important to use a very low distortion capacitor for the input filter. Shown in Figure 4, Figure 5 and
Figure 6, are other DC1796A driver configurations. In
order to create the configurations shown in Figure 5 and
Figure 6, component R14 (0Ω) needs to be removed from
the board.
Reference
For component values for various circuit gains, refer
to the Application Information section of the LTC6360
data sheet.
The default reference is a LTC6655 4.096V reference. An
external reference can be used by removing (U3) and
populating (R3). If an external reference is used, it must
settle quickly in the presence of glitches on the REF pin.
AC-coupling the input may degrade the distortion performance due to nonlinearity of the coupling capacitor.
dc1796af
4
DEMO MANUAL DC1796A
DC1796A Setup
dc1796a F03
Figure 3. DC-Coupled Noninverting LTC6360 Drives LTC2369-18 18-Bit SAR ADC
dc1796a F04
Figure 4. AC-Coupled Noninverting LTC6360 Drives LTC2369-18 18-Bit SAR ADC
dc1796af
5
DEMO MANUAL DC1796A
DC1796A Setup
dc1796a F05
Figure 5. DC-Coupled Inverting LTC6360 Drives LTC2369-18 18-Bit SAR ADC
dc1796a F06
Figure 6. AC-Coupled Inverting LTC6360 Drives LTC2369-18 18-Bit SAR ADC
dc1796af
6
DEMO MANUAL DC1796A
DC1796A Setup
Layout
As with any high performance ADC, system layout is critical to achieve optimal performance. The area immediately
surrounding the ADC on the DC1796A should be used
as a guideline for placement and routing of the various
components associated with the ADC. The following are
some things to consider when laying out a board for the
LTC6360 and LTC2369-18:
n
n
n
n
A ground plane is necessary to obtain best performance.
Keep bypass capacitors as close to supply pins as possible.
Use individual low impedance returns for all bypass
capacitors.
Use of a symmetrical layout around the analog inputs
will minimize the effects of parasitic elements.
n
n
n
Shield analog input traces with ground to minimize
coupling from other traces.
Keep critical traces as short as possible.
Remove ground plane metal from under the –IN pin of
the LTC6360 (Pin 1) to reduce parasitic capacitance at
this node.
Component Selection
When driving a low noise, low distortion ADC, such as
the LTC2369-18 with the LTC6360, 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.
DC1796A Jumpers
Definitions
JP2: CM sets the DC bias for AIN+/AIN– when the inputs
are AC-coupled. VREF /2 is the default setting.
JP3: Toggles the LTC6360 ON and OFF. Part ON (+5V) is
the default setting.
JP4: Ties the WP pin of the EEPROM to VCC or GND. WP
is the hardware write-protect pin. If tied to VCC,
hardware write-protection is enabled. If WP is tied
to GND, the hardware write-protection is disabled.
JP5: VCCIO sets the output levels at J3 to either 3.3V or
2.5V. Use 3.3V to interface to the DC718, which is
the default setting.
dc1796af
7
DEMO MANUAL DC1796A
Application Screenshots
dc1796a F07
Figure 7. PScope Screenshot
dc1796af
8
DEMO MANUAL DC1796A
Application Screenshots
dc1796a F08
Figure 8. QuikEval Screenshot
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC1826A Required Circuit Components
1
17
C1-C6, C10, C12, C14, C15, C20,
C21, C22, C24, C26, C28, C33
CAP., X7R, 0.1µF, 25V, 10%, 0603
AVX, 06033C104KAT2A
2
7
C7, C31, C34, C36, C39, C42, C45
CAP., X7R, 1µF, 16V, 10%, 0603
AVX, 0603YC105KAT2A
3
3
C8, C18, C27
CAP., X5R, 10µF, 10V, 20%, 0805
TAIYO YUDEN, LMK212BJ106MG
4
1
C9
CAP., X5R, 47µF, 6.3V, 20%, 0805
TAIYO YUDEN, JMK212BJ476MG-T
5
1
C11
CAP., X7R, 1µF, 16V, 10%, 0805
TDK, C2012X7R1C105K/0.85
6
6
C13, C19, C38, C41, C44, C47
CAP., X5R, 10µF, 6.3V, 20%, 0603
TDK, C1608X5R0J106MT
7
1
C16
CAP., X7R, 470pF 16V, 10%, 0402
AVX, 0402YC471KAT4A
8
1
C17
CAP., X7R, 0.01µF, 16V, 10%, 0402
AVX, 0402YC103KAT2A
9
0
C23, C29, C56, C58, C59 (OPT)
CAP., 0603
OPT
C57
CAP., NPO, 50pF, 100V, 5%, 0603
AVX, 06031A500JAT2A
10
11
2
C25, C30
CAP., NPO, 10000pF, 50V, 1206
PANASONIC, ECJ-3FC1H103J
12
1
C32
CAP., X5R, 3.3µF, 16V, 10%, 0805
MURATA, GRM21BR61C335KA88L
13
1
C35
CAP., X5R, 22µF, 16V, 20%, 1210
TAIYO YUDEN, EMK325BJ226MM-T
14
5
C37, C40, C43, C46, C60
CAP., X7R, 0.01µF, 16V, 10%, 0603
AVX, 0603YC103KAT
dc1796af
9
DEMO MANUAL DC1796A
parts list
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
15
8
C48-C55
CAP., X7R, 0.1µF, 16V, 10%, 0402
TDK, C1005X7R1C104KT
16
6
E1, E2, E3, E4, E9, E10
TP, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
17
4
E5-E8
TP, TURRET, 0.064"
MILL-MAX, 2308-2-00-80-00-00-07-0
18
2
J1, J2
CONN., BNC-5PINS
CONNEX, 112404
19
1
J3
CONN., 40PINS SMT, CON-EDGE40-100
SAMTEC, TSW-120-07-L-D
20
1
J4
HEADER, 2×7, 0.079"
MOLEX, 87831-1420
21
1
J5
HEADER, 2×5, 0.100", HD2X5-100
SAMTEC, TSW-105-07-L-D
22
4
JP2-JP5
JMP., 1×3, 0.100", HD1X3-100
SAMTEC, TSW-103-07-L-S
23
4
XJP2, XJP3, XJP4, XJP5
SHUNT, 0.100" CENTER
SAMTEC, SNT-100-BK-G
24
1
JP1 (PINS 1-2, REF)
SHUNT, 0.100" CENTER, FOR PINS 1-2, REF
SAMTEC, JL-100-25-T
25
5
R1, R4, R8, R9, R28
RES., CHIP, 33Ω, 0603, 1/10W, 1%
NIC, NRC06F33R0TRF
26
8
R2, R7, R12, R16, R19, R24,
R32, R43
RES., CHIP, 1.00kΩ, 0603, 1/10W, 1%
NIC, NRC06F1001TRF
27
0
R3, R15, R29, R30, R31 (OPT)
RES., 0603
OPT
28
6
R5, R10, R11, R13, R14, R22
RES., CHIP, 0Ω, 1/16W, 0603
VISHAY, CRCW06030000Z0ED
29
1
R6
RES., CHIP, 49.9Ω, 1/4W, 1%, 1206
NIC, NRC12F49R9TRF
30
2
R17, R23
RES., CHIP, 4.99Ω, 1/10W, 1%, 0603
VISHAY, CRCW06034R99FKEA
31
2
R18, R20
RES., CHIP, 0.0Ω, 1/16W, 0402
VISHAY, CRCW04020000Z0ED
32
1
R21
RES., CHIP, 2.00kΩ, 1/10W, 1%, 0603
NIC, NRC06F2001TRF
33
3
R25, R26, R27
RES., CHIP, 4.99kΩ, 1/10W, 1%, 0603
NIC, NRC06F4991TRF
34
1
R34
RES., CHIP, 10kΩ, 1/16W, 1%, 0402
NIC, NRC04F1002TRF
35
1
R36
RES., CHIP, 1.69kΩ,1/10W, 1%, 0603
NIC, NRC06F1691TRF
36
1
R37
RES., CHIP, 1.54kΩ, 1%, 0603
NIC, NRC06F1541TRF
37
1
R38
RES., CHIP, 2.80kΩ, 1%, 0603
NIC, NRC06F2801TRF
38
3
R39, R40, R41
RES., CHIP, 1kΩ, 1/16W, 1%, 0402
NIC, NRC04F1001TRF
39
1
R42
RES., CHIP, 10kΩ, 1/10W, 1%, 0603
NIC, NRC06F1002TRF
40
2
U1, U6
IC., TINYLOGIC UHS INVERTER, SC70-5
FAIRCHILD, NC7SZ04P5X
41
2
U2, U5
IC., TINYLOGIC ULP-A UNBUFFERED
INVERTER, SC70-5
FAIRCHILD, NC7SVU04P5X
42
1
U3
IC., LTC6655CHMS8-4.096, MS8
LINEAR TECHNOLOGY, LTC6655CHMS8-4.096#PBF
43
1
U4
IC., SINGLE D FLIP FLOP, US8
ON SEMI., NL17SZ74
44
1
U7
IC., SINGLE SPST BUS SWITCH, SC70-5
FAIRCHILD, NC7SZ66P5X
45
1
U9
IC., LTC6360CMS8E, MS8E
LINEAR TECHNOLOGY, LTC6360CMS8E#PBF
46
1
U10
IC., SERIAL EEPROM, TSSOP
MICROCHIP, 24LC024-I/ST
47
1
U11
IC., LT1763CS8-1.8, SO8
LINEAR TECHNOLOGY, LT1763CS8-1.8#PBF
48
1
U12
IC., LT1763CS8, SO8
LINEAR TECHNOLOGY, LT1763CS8#PBF
49
1
U13
IC., MAX II FAMILY, TQFP100
ALTERA, EPM240GT100C5N
50
1
U14
IC., LT1763CS8-2.5, SO8
LINEAR TECHNOLOGY, LT1763CS8-2.5#PBF
51
1
U15
IC., LT1763CS8-5, SO8
LINEAR TECHNOLOGY, LT1763CS8-5#PBF
52
4
MH1-MH4
STAND-OFF, NYLON (SNAP-ON), 0.375" TALL KEYSTONE, 8832(SNAP ON)
dc1796af
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DEMO MANUAL DC1796A
parts list
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC1796A-A Required Circuit Components
1
1
DC1796A-2
GENERAL BOM
2
1
U8
IC., LTC2370CMS-16, MS16
LINEAR TECHNOLOGY, LTC2370CMS-16, MS16
3
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
4
0
RES., CHIP, 300Ω, 1%, 0402
OPT
R35 (OPT)
DC1796A-B Required Circuit Components
1
1
DC1796A-2
GENERAL BOM
2
1
U8
IC., LTC2368CMS-16, MS16
LINEAR TECHNOLOGY, LTC2368CMS-16
3
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
4
0
RES., CHIP, 300Ω, 1%, 0402
OPT
R35 (OPT)
DC1796A-C Required Circuit Components
1
1
DC1796A-2
GENERAL BOM
2
1
U8
IC., LTC2367CMS-16, MS16
LINEAR TECHNOLOGY, LTC2367CMS-16
3
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
4
0
RES., CHIP, 300Ω, 1%, 0402
OPT
R35 (OPT)
DC1796A-D Required Circuit Components
1
1
DC1796A-2
U8
2
1
3
1
4
0
R35 (OPT)
GENERAL BOM
IC., LTC2364CMS-16, MS16
LINEAR TECHNOLOGY, LTC2364CMS-16
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
RES., CHIP, 300Ω, 1%, 0402
OPT
DC1796A-E Required Circuit Components
1
1
DC1796A-2
U8
2
1
3
1
4
1
R35
GENERAL BOM
IC., LTC2369CMS-18, MS16
LINEAR TECHNOLOGY, LTC2369CMS-18
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
RES., CHIP, 300Ω, 1%, 0402
NIC, NRC04F3000TRF
DC1796A-F Required Circuit Components
1
1
DC1796A-2
GENERAL BOM
2
1
U8
IC., LTC2368CMS-18, MS16
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
R35
RES., CHIP, 300Ω, 1%, 0402
NIC, NRC04F3000TRF
3
1
4
1
LINEAR TECHNOLOGY, LTC2368CMS-18
DC1796A-G Required Circuit Components
1
1
DC1796A-2
GENERAL BOM
2
1
U8
IC., LTC2367CMS-18, MS16
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
R35
RES., CHIP, 300Ω, 1%, 0402
NIC, NRC04F3000TRF
3
1
4
1
LINEAR TECHNOLOGY, LTC2367CMS-18
DC1796A-H Required Circuit Components
1
1
DC1796A-2
GENERAL BOM
2
1
U8
IC., LTC2364CMS-18, MS16
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1796A-2
R35
RES., CHIP, 300Ω, 1%, 0402
NIC, NRC04F3000TRF
3
1
4
1
LINEAR TECHNOLOGY, LTC2364CMS-18
dc1796af
11
A
B
C
D
E10
EXT_CM
0V - VREF
AIN+ / AIN-
GND
VREF / 2
E9
0
C31
1uF
CM
1
2
3
JP2
5
R32
1K
R12
1K
C4
0.1uF
R6
49.9
1206
R15
OPT
R13
BNC
VREF / 2
EXT
BNC
J1
C34
1uF
E2
J2
CLK
100MHz Max
3.3Vpp
C23
OPT
R2
1k
0
R5
R7
1k
2
5
3
C26
0.1uF
C60
0.01uF
C27
10uF
6.3V
0805
C58
OPT
0
JP3
1
2
3
+5V
R30
OPT
C15
0.1uF
3
SHDN
R31
OPT
C57
50pF
NPO
2
+5V
GND
C32
3.3uF
0805
R14
U1
NC7SZ04P5X
4
5
+3.3V
8
7
6
5
R11
0
C56
OPT
+IN
SHDN
VCPI
VCPO
C16
470pF
0402
U2
NC7SVU04P5X
4
C2
0.1uF
U9
*
18
LTC2364CMS-18
-H
4
LTC2368CMS-18
LTC2367CMS-18
-F
-G
0.25
0.5
1.0
C30
10nF
NPO
1206
C25
10nF
1206
NPO
SHDN
GND
GND
GND
GNDVOUT_S
VIN VOUT_F
5
6
7
8
R20
0
0402
5
4
IN-
IN+
* U8
C20
0.1uF
LTC23XXCMS
C13
10uF
6.3V
C14
0.1uF
C7
1uF
R3
OPT
E1
EXT_REF
SCK
R24
1k
RDL/SDI
BUSY
SDO
SDO
BUSY
RD
14
11
12
3
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
SDO
R16
1k
SCK
13
9
JP1
C10
0.1uF
REF
GND
REF / SEL
1
2
3
CNV
C9
47uF
6.3V
0805
NOTE: UNLESS OTHERWISE SPECIFIED
C19
10uF
6.3V
R18
0
0402
+2.5V
+3.3V
LTC6655CHMS8-4.096
4
3
2
1
U3
2
SDO
4
4
HD2X12-079-MOLEX
1
3
5
7
9
11
13
J4
DC590
2
4
6
8
10
12
14
U6
NC7SZ04P5X
DC590_DETECT +3.3V
TO CPLD
7
8
SCK
CNV
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
9V-10V
R9
33
PR
VCC
1
U7
NC7SZ66P5X
OE
A
0.1uF
CLR
GND
2
C33
0.1uF
33
R8
ERJON Q.
SCALE = NONE
APP ENG.
PCB DES. NC
APPROVALS
CNV
SCK
R21
2k
R19
1k
C3
0.1uF
C24
0.1uF
2
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
B
6
4
C21
NL17SZ74
U4
33
R1
+3.3V
+3.3V
CNV
BUSY
RD
Figure 9. LTC6360 Driving 18-Bit SAR ADC
18
18
1.6
18
LTC2369CMS-18
-E
16
R23
4.99
R17
4.99
C22
0.1uF
0805
C18
10uF
C6
0.1uF
+5V
Msps
2.0
1.0
0.5
-B
-C
0.25
OPT
C59
R29
OPT
R22
0
LTC2364CMS-16
C29
OPT
0
R10
-D
1
2
3
4
0402
C17
0.01uF
0.1uF
C12
1uF
0805
C11
0805
C8
10uF
9V-10V
U8
BITS
LTC2370CMS-16 16
LTC2368CMS-16 16
LTC2367CMS-16 16
ASSY
-A
-IN
OUT
VCC
VDD
CLK
LTC6360CMS8E
33
R4
VCC
C1
0.1uF
VDD
GND
3
1
Q
3
+3.3V
OVDD
GND
6
2
GND
10
15
GND
16
8
REF/SEL
3
7
REF
CHAIN
1
5
VCC
GND
3
2
D
CP
Q
5
+3.3V
GND
9
5
3
4
8
VCC
VSS
29
27
25
23
21
19
17
15
13
11
9
7
DB4
DB5
DB6
DB7
DB8
DB9
DB10
DB11
DB12
DB13
DB14
DB15
3
2
1
6
5
7
DATE:
N/A
SIZE
JP4
1
3
R27
4.99k
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
12-9-11
1
LTC6360CMS8E
DEMO CIRCUIT 1796A - A / H
SHEET 1
LTC6360 DRIVING 18 - BIT SAR ADC
IC NO.
DATE
12-9-11
OF
2
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
PROG
WP
R26
4.99k
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
DB16
40
ERJON Q.
APPROVED
CNVST_33
DB17
3201S-40G1
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
TECHNOLOGY
1
2
3
31
DB3
R25
4.99k
33
DB2
TITLE: SCHEMATIC
A2
A1
A0
SCL
SDA
WP
35
5
37
39
J3
FROM CPLD
DB17
DB16
2
C5
0.1uF
PROD. FABRICATION
DB1
CLKOUT
U10
24LC024-I/ST
C28
0.1uF
+3.3V
1
DESCRIPTION
REVISION HISTORY
DB0
NC7SVU04P5X
U5
2
-
4
REV
ECO
5
3
12
4
5
A
B
C
D
DEMO MANUAL DC1796A
Schematic Diagram
dc1796af
A
B
C
D
+3.3V
21
20
19
18
17
16
15
8
7
7
5
3
1
6
4
2
C49
0.1uF
JP2X5/100
9
8
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
5
R43
1k
C51
0.1uF
R42
10k
U13B
EPM240T
50
49
48
47
42
41
40
39
38
37
36
35
34
33
30
29
28
27
26
C52
0.1uF
IO50
IO49
IO48
IO47
IO42
IO41
IO40
IO39
IO38
IO37
IO36
IO35
IO34
IO33
IO30
IO29
IO28
IO27
IO26
0402 X 8 PLCS
C50
0.1uF
IO21
10
JTAG
DB15
CLKOUT
5
J5
DB14
4
CNVST_33
DB13
3
6
DB12
DB11
2
1
C48
0.1uF
IO21
IO20
IO19
IO18
IO17
IO16
IO15
IO8
IO7
IO6
IO5
IO4
IO3
IO2
IO1
+3.3V
U13A
EPM240T
R35
300
OPT
0402
R34
10k
0402
+3.3V
C53
0.1uF
C54
0.1uF
1K
R41
+1.8V
1K
1K
R40
R39
13
63
9
31
45
59
80
94
C55
0.1uF
CLK
IO38
BUSY
SCK
RD
SCK
SDO
0402 X 3 PLCS
33
R28
DC590_DETECT
IO75
IO74
IO73
IO72
IO71
IO70
IO69
IO68
IO67
IO66
IO61
IO58
IO57
IO56
IO55
IO54
IO53
IO52
IO51
CNTRL
TDO
TCK
TDI
TMS
DEV_CLRN
DEV_OE
GCLK3
GCLK2
GCLK1
GCLK0
U13E
EPM240T
POWER
VCCINT
VCCINT
VCCIO1
VCCIO1
VCCIO1
VCCIO2
VCCIO2
VCCIO2
U13F
EPM240T
25
24
23
22
44
43
64
62
14
12
U13C
EPM240T
75
74
73
72
71
70
69
68
67
66
61
58
57
56
55
54
53
52
51
4
GND
GND
GND
GND
GND
GND
GND
GND
4
10
11
32
46
60
93
65
79
DB2
DB1
DB0
DB17
DB16
IO68
IO56
IO100
IO99
IO98
IO97
IO96
IO95
IO92
IO91
IO90
IO89
IO88
IO87
IO86
IO85
IO84
IO83
IO82
IO81
IO78
IO77
IO76
100
99
98
97
96
95
92
91
90
89
88
87
86
85
84
83
82
81
78
77
76
DB10
DB9
DB8
DB7
IO86
DB6
DB5
DB3
DB4
GND
9V-10V
3
E4
E3
9V-10V
C35
22uF
16V
1210
5
5
8
5
8
5
8
SHDN
IN
LT1763CS8-5
U15
SHDN
IN
LT1763CS8-2.5
U14
SHDN
IN
U12
LT1763CS8
SHDN
IN
U11
LT1763CS8-1.8
4
2
1
BYP
SEN
OUT
BYP
SEN
OUT
BYP
SEN
OUT
BYP
SEN
OUT
2
4
2
1
4
2
1
4
2
1
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
C45
1uF
16V
9V-10V
C42
1uF
16V
9V-10V
C39
1uF
16V
9V-10V
16V
C36
1uF
8
Figure 10. LTC6360 Driving 18-Bit SAR ADC
U13D
EPM240T
3
GND
GND
GND
3
6
7
GND
GND
GND
3
6
7
GND
GND
GND
3
6
7
GND
GND
GND
3
6
7
5
ERJON Q.
APP ENG.
SCALE = NONE
NC
PCB DES.
APPROVALS
C46
0.01uF
C43
0.01uF
C40
0.01uF
0.01uF
C37
DATE:
N/A
SIZE
12-9-11
IC NO.
3
2
1
R38
2.80k
E5
C47
10uF
6.3V
C44
10uF
6.3V
E8
E7
C41
10uF
6.3V
C38
10uF
6.3V
+3.3 V
+5 V
+2.5 V
E6
+1.8 V
1
LTC6360CMS8E
DEMO CIRCUIT 1796A - A / H
SHEET 2
OF
2
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
+5V
+2.5V
R37
1.54k
R36
1.69k
+3.3V
+1.8V
LTC6360 DRIVING 18 - BIT SAR ADC
TECHNOLOGY
JP5
VCCIO
TITLE: SCHEMATIC
+2.5V
+3.3V
1
A
B
C
D
DEMO MANUAL DC1796A
Schematic Diagram
dc1796af
13
DEMO MANUAL DC1796A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
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 30 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 application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc1796af
14 Linear Technology Corporation
LT 0512 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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