DC1337A - Demo Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1337
8-CHANNEL, 12-BIT, SAR ADC WITH I2C INTERFACE
LTC2309
DESCRIPTION
Demonstration circuit 1337 features the
LTC2309, a low noise, low power, 8-Channel,
12-Bit, successive approximation ADC with
2
an I C compatible serial interface. The
LTC2309 is available in a 24-pin 4mm x 4mm
QFN package. DC1337 demonstrates the
DC performance of the LTC2309 in
conjunction with the DC590B Quick Eval
data collection board. Alternatively, by
connecting the DC1337 into a customer
application the performance of the LTC2309
can be evaluated directly in that circuit.
Design files for this circuit board are
available. Call the LTC factory.
LTC is a trademark of Linear Technology Corporation
FIGURE 1. DC1337A
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1337
8-CHANNEL, 12-BIT, SAR ADC WITH I2C INTERFACE
DC590B QUICK START PROCEDURE
Connect DC1337 to a DC590B USB serial
controller using the supplied 14-conductor
ribbon cable. Make sure the VCCIO jumper
of the DC590B is in the 5V position.
Connect DC590B to a host PC with a
standard USB A/B cable. Apply analog input
voltage to CH0-CH7 on connector J1. Run the
evaluation software supplied with DC590B or
download it from www.linear.com. The correct
control panel will be loaded automatically.
Click the COLLECT (Figure 2) button to begin
reading the ADC Ch0-Ch3. Press the Page 1
Button to toggle to Page 2. This displays Ch4Ch7. This button toggles between the two
displays.
The Help menu contains information on Data
Logging the ADC results. The Tools menu
has the Data Logging option as well as
options for changing the number of points
displayed, the number of points in an average
and whether the data is displayed in LSBs or
Volts. The View menu can be used to access
the LTC2309 product page.
If the Quick Eval program is started without
the demo board attached to DC590B, the
Tools menu can be used to check for updates
and automatically install them. DC 1337
requires at least version K71 of the Quick
Eval software.
HARDWARE SET UP
SIGNAL CONNECTIONS
See Figure 1 for locations.
J1 Connector for CH0-CH7, COM and
BIAS/2. Limit input voltage swings to GNDAVDD. For optimum performance, the input
should be bandlimited to the frequencies of
interest.
2
J2 AD0 I C address line. Set to GND for
operation with supplied software.
2
J3 AD1 I C address line. Set to GND for
operation with supplied software.
J4 COM Common pin for single ended ADC
conversions. Can be set to GND or left
floating so that COM can be driven by J1.
J5
DC590 interface connector. Provides
power and I2C interface to DC1337.
J6 BIAS Selects between Refcomp and an
external bias voltage to drive the Bias/2 line.
Bias/2 is designed to set a center point for the
minus input during bipolar operation.
EXT_BIAS
External Bias connection. This
can be used to drive the BIAS/2 line through a
2:1 divider. To use this pin put jumper J6 in
the EXT position and apply desired bias
voltage.
5V Five volt supply line for DC1337. Use this
line only if DC590 is not used
GND Ground line for DC1337
2
SDA I C bidirectional data line. Controlled by
DC590B if connected.
2
SCL I C clock line. Controlled by DC590B if
connected.
VREF Connected to ADC Vref pin.
REFCOMP Connected to ADC Refcomp pin.
BIAS/2 Bias voltage/2 (Refcomp or Ext)
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1337
8-CHANNEL, 12-BIT, SAR ADC WITH I2C INTERFACE
USING DC1337 WITHOUT DC590
Interface signals SDA and SCL and power are normally
provided to DC1337 by DC590. If you use this board
without DC590, it is the users responsibility to connect a
5V power supply and ground as well as generating SDA
and SCL. These signals can be provided through the
14-pin ribbon cable connector. See schematic for pinout
See LTC2309 Data Sheet for information on driving
SDA and SCL.
Figure 2. DC1337 Quick Eval Screenshot
3
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1337
8-CHANNEL, 12-BIT, SAR ADC WITH I2C INTERFACE
NC
14
EESDA
EEVCC
EESCL
EEGND
12
9
10
11
MISO
MOSI/SDA
5
CS
SCK/SCL
7
4
6
5V
VUNREG
F
7C p47
F
6C p47
Fp
74
11
C
Fp
74
5
SDA
A1
A0
FFGND
1
2
WP
A2
3
7
01 pF7
C 4
100
F
9C p74
100
20
18
16
14
R9
100
R7
12
21
C
R8
100
10
R5
100
R6
100
R4
8
6
F
13C p47
SA
IB
_T
XE
E8
E6
19
17
15
13
11
9
7
5
3
J1
D
N
G
1
V5
E2
E1
5V
4
R3
100
R2
100
F
5C p47
100
1%
6
G ND
FLT
22
23
24
1
2
3
4
5
6
2
COM
1
F
8C 7p4
R1
71 Fu1
C
3
4J
1%
R12
1%
R11
1
REFCOM P
EXT
21
M
H0C H1C H2C H3C H4C H5C H6C H7C O
C
K9
.94
3
BIAS
15
16
17
49.9 1%
K9
.94
F
15C 0u1
2
1%
E7
E5
GND
9
LTC2309CUF
SCL
3
5V
FLT
3
5V
10
5V 5V
14
11
5V
6J
2
18
4C
19
13
1C
DDV D
20
12
Fu
1.
0
81 F
C u.1
0
25
Fu
10
31 K
R 9.9
4
8
Fu
.10
2C
P MOCF E R
DA P
DN G
DN G
DN G
DN G
DN G
DN G
41 K
R 9.9
4
61 Fu0
C 1
7
DDV A
D DV A
41 F2u.
C 2
AD LC 1D 0D
S S A AF E R V
24LC025-I/ST
G ND
5V
FLT
AD1
1
2
4
J2
AD0
5V
2
1
J3
4
8
1U
01
R
VCC
uF1
.0
3C
P
M
O
C
FE
R
FE
R
V
GND
2U
4
51 9K.9
R 4
1%
5V
2
J5
GND
1
GND
3
E4
GND
8
E3
LC
S
13
AD
S
2/
SA
IB
4
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