serial interface. These ADCs include a fully differential
sample-and-hold circuit to reduce common mode noise.
The internal conversion clock allows the external serial
output data clock (SCK) to operate at any frequency up
to 40MHz.
The LTC2302/LTC2306 operate from a single 5V supply
and draw just 2.8mA at a sample rate of 500ksps. The
auto-shutdown feature reduces the supply current to 14μA
at a sample rate of 1ksps.
The LTC2302/LTC2306 are packaged in a tiny 10-pin 3mm
×
3mm DFN. The low power consumption and small size
make the LTC2302/LTC2306 ideal for battery-operated
and portable applications, while the 4-wire SPI compat-
ible serial interface makes these ADCs a good match for
isolated or remote data acquisition systems.
TYPE
Int Reference
Ext Reference
1
NUMBER OF INPUT CHANNELS
2
LTC2306
8
n
n
n
n
n
n
n
12-Bit Resolution
500ksps Sampling Rate
Low Noise: SINAD = 72.8dB
Guaranteed No Missing Codes
Single 5V Supply
Auto-Shutdown Scales Supply Current with Sample
Rate
Low Power: 14mW at 500ksps
70μW at 1ksps
35μW Sleep Mode
1-Channel (LTC2302) and 2-Channel (LTC2306)
Versions
Unipolar or Bipolar Input Ranges (Software
Selectable)
Internal Conversion Clock
SPI/MICROWIRE
™
Compatible Serial Interface
Separate Output Supply OV
DD
(2.7V to 5.25V)
Software Compatible with the LTC2308
10-Pin (3mm
×
3mm) DFN Package
APPLICATIONS
n
n
n
n
n
n
LTC2308
LTC2302
High Speed Data Acquisition
Industrial Process Control
Motor Control
Accelerometer Measurements
Battery-Operated Instruments
Isolated and/or Remote Data Acquisition
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V
2.7V TO 5.25V
10μF
0.1μF
0.1μF
8192 Point FFT, f
IN
= 1kHz (LTC2306)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
0
50
100
f
SMPL
= 500kHz
SINAD = 72.8dB
THD = –88.7dB
SDI
ANALOG INPUTS
CH0 (IN
+
)
0V TO 4.096V UNIPOLAR
CH1 (IN
–
)
±2.048V
BIPOLAR
ANALOG
INPUT
MUX
+
–
12-BIT
500ksps
ADC
SERIAL
PORT
SDO
SCK
CONVST
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTER
PIN NAMES IN PARENTHESIS
REFER TO LTC2302
GND
V
REF
0.1μF
10μF
23026 TA01
MAGNITUDE (dB)
V
DD
OV
DD
LTC2302
LTC2306
150
200
250
FREQUENCY (kHz)
23026 TA01b
23026f
1
LTC2302/LTC2306
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (V
DD
, OV
DD
)......................... –0.3V to 6V
Analog Input Voltage (Note 3)
CH0(IN
+
)-CH1(IN
–
),
REF ..............................(GND – 0.3V) to (V
DD
+ 0.3V)
Digital Input Voltage
(Note 3).............................(GND – 0.3V) to (V
DD
+ 0.3V)
Digital Output Voltage ... (GND – 0.3V) to (OV
DD
+ 0.3V)
Power Dissipation ...............................................500mW
Operating Temperature Range
LTC2302C/LTC2306C ............................... 0°C to 70°C
LTC2302I/LTC2306I.............................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
LTC2302
TOP VIEW
SDO 1
CONVST 2
V
DD
3
IN
+
IN
–
4
5
11
10 OV
DD
9 SCK
8 SDI
7 GND
6 V
REF
SDO 1
CONVST 2
V
DD
3
CH0 4
CH1 5
11
LTC2306
TOP VIEW
10 OV
DD
9 SCK
8 SDI
7 GND
6 V
REF
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2302CDD#PBF
LTC2302IDD#PBF
LTC2306CDD#PBF
LTC2306IDD#PBF
TAPE AND REEL
LTC2302CDD#TRPBF
LTC2302IDD#TRPBF
LTC2306CDD#TRPBF
LTC2306IDD#TRPBF
PART MARKING*
LDGV
LDGV
LDGW
LDGW
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
23026f
2
LTC2302/LTC2306
CONVERTER AND MULTIPLEXER CHARACTERISTICS
PARAMETER
Resolution (No Missing Codes)
Integral Linearity Error
Differential Linearity Error
Bipolar Zero Error
Bipolar Zero Error Drift
Unipolar Zero Error
Unipolar Zero Error Drift
Unipolar Zero Error Match (LTC2306)
Bipolar Full-Scale Error
Bipolar Full-Scale Error Drift
Unipolar Full-Scale Error
Unipolar Full-Scale Error Drift
Unipolar Full-Scale Error Match (LTC2306)
(Note 8)
l
The
l
denotes the specifications
which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C. (Notes 4, 5)
CONDITIONS
l
MIN
12
l
l
l
l
TYP
±0.3
±0.25
±1
0.002
±1
0.002
±0.3
MAX
±1
±1
±6
±6
±3
±8
±6
±3
UNITS
Bits
LSB
LSB
LSB
LSB/°C
LSB
LSB/°C
LSB
LSB
LSB/°C
LSB
LSB/°C
LSB
(Note 6)
(Note 7)
(Note 7)
(Note 8)
l
±1.5
0.05
±1.2
0.05
±0.3
ANALOG INPUT
SYMBOL
V
IN
+
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 4)
PARAMETER
Absolute Input Range (CH0, CH1, IN
+
)
Absolute Input Range (CH0, CH1, IN
–
)
CONDITIONS
(Note 9)
Unipolar (Note 9)
Bipolar (Note 9)
V
IN
= V
IN+
– V
IN–
(Unipolar)
V
IN
= V
IN+
– V
IN–
(Bipolar)
Sample Mode
Hold Mode
l
l
l
l
l
l
MIN
–0.05
–0.05
–0.05
TYP
MAX
V
DD
V
DD
/2
V
DD
UNITS
V
V
V
V
V
V
IN–
V
IN+
– V
IN–
Input Differential Voltage Range
I
IN
C
IN
CMRR
Analog Input Leakage Current
Analog Input Capacitance
Input Common Mode Rejection Ratio
0 to V
REF
±V
REF
/2
±1
55
5
70
μA
pF
pF
dB
REFERENCE INPUT
SYMBOL
I
REF
C
REF
PARAMETER
V
REF
Input Range
Reference Input Current
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
l
MIN
0.1
l
l
TYP
50
230
55
MAX
V
DD
80
260
UNITS
V
μA
μA
pF
f
SMPL
= 0ksps, V
REF
= 4.096V
f
SMPL
= 500ksps, V
REF
= 4.096V
Reference Input Capacitance
23026f
3
LTC2302/LTC2306
DYNAMIC ACCURACY
SYMBOL
SINAD
SNR
THD
SFDR
PARAMETER
Signal-to-(Noise + Distortion) Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious Free Dynamic Range
Channel-to-Channel Isolation
Full Linear Bandwidth
–3dB Input Linear Bandwidth
Aperature Delay
Transient Response
Full-Scale Step
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Notes 4, 10)
CONDITIONS
f
IN
= 1kHz
f
IN
= 1kHz
f
IN
= 1kHz, First 5 Harmonics
f
IN
= 1kHz
f
IN
= 1kHz
(Note 11)
l
l
l
l
MIN
71
71
79
TYP
72.8
73.2
–88
89
–109
700
25
13
240
MAX
UNITS
dB
dB
–78
dB
dB
dB
kHz
MHz
ns
ns
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
OZ
C
OZ
I
SOURCE
I
SINK
PARAMETER
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage
Hi-Z Output Capacitance
Output Source Current
Output Sink Current
OV
DD
= 4.75V, I
OUT
= –10μA
OV
DD
= 4.75V, I
OUT
= –200μA
OV
DD
= 4.75V, I
OUT
= 160μA
OV
DD
= 4.75V, I
OUT
= 1.6mA
V
OUT
= 0V to OV
DD
, CONVST High
CONVST High
V
OUT
= 0V
V
OUT
= OV
DD
CONDITIONS
V
DD
= 5.25V
V
DD
= 4.75V
V
IN
= V
DD
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
l
l
l
TYP
MAX
0.8
±10
UNITS
V
V
μA
pF
V
V
2.4
5
l
l
l
4.74
4
0.05
0.4
±10
15
–10
10
V
V
μA
pF
mA
mA
POWER REQUIREMENTS
SYMBOL
V
DD
OV
DD
I
DD
P
D
PARAMETER
Supply Voltage
Output Driver Supply Voltage
Supply Current
Sleep Mode
Power Dissipation
Sleep Mode
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
l
l
l
l
MIN
4.75
2.7
TYP
5
2.8
7
14
35
MAX
5.25
5.25
3.5
15
UNITS
V
V
mA
μA
mW
μW
C
L
= 25pF
CONVST = 5V, Conversion Done
23026f
4
LTC2302/LTC2306
TIMING CHARACTERISTICS
SYMBOL
f
SMPL(MAX)
f
SCK
t
WHCONV
t
HD
t
SUDI
t
WHCLK
t
WLCLK
t
WLCONVST
t
HCONVST
t
CONV
t
ACQ
t
dDO
t
hDO
t
en
t
dis
t
r
t
f
t
CYC
PARAMETER
Maximum Sampling Frequency
Shift Clock Frequency
CONVST High Time
Hold Time SDI After SCK↑
Setup Time SDI Stable Before SCK↑
SCK High Time
SCK Low Time
CONVST Low Time During Data Transfer
Hold Time CONVST Low After Last SCK↓
Conversion Time
Acquisition Time
SDO Data Valid After SCK↓
SDO Hold Time SCK↓
SDO Valid After CONVST↓
Bus Relinquish Time
SDO Rise Time
SDO Fall Time
Total Cycle Time
7th SCK↑ to CONVST↑ (Note 9)
C
L
= 25pF (Note 9)
C
L
= 25pF
C
L
= 25pF
C
L
= 25pF
C
L
= 25pF
C
L
= 25pF
f
SCK
= f
SCK(MAX)
f
SCK
= f
SCK(MAX)
(Note 9)
(Note 9)
(Note 9)
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
TYP
MAX
500
40
UNITS
kHz
MHz
ns
ns
ns
ns
ns
ns
ns
20
2.5
0
10
10
410
20
1.3
240
10.8
4
11
11
4
4
2
15
15
12.5
1.6
μs
ns
ns
ns
ns
ns
ns
ns
μs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All voltage values are with respect to ground with V
DD
and OV
DD
wired together (unless otherwise noted).
Note 3:
When these pin voltages are taken below ground or above V
DD
,
they will be clamped by internal diodes. These products can handle input
currents greater than 100mA below ground or above V
DD
without latchup.
Note 4:
V
DD
= 5V, OV
DD
= 5V, V
REF
= 4.096V, f
SMPL
= 500ksps, unless
otherwise specified.
Note 5:
Linearity, offset and full-scale specifications apply for a single-
ended analog input with respect to GND for the LTC2306 and IN
+
with
respect to IN
–
tied to GND for the LTC2302.
Note 6:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 7:
Bipolar zero error is the offset voltage measured from –0.5LSB
when the output code flickers between 0000 0000 0000 and 1111 1111
1111. Unipolar zero error is the offset voltage measured from +0.5LSB
when the output code flickers between 0000 0000 0000 and 0000 0000
0001.
Note 8:
Full-scale bipolar error is the worst-case of –FS or +FS untrimmed
deviation from ideal first and last code transitions and includes the effect
of offset error. Unipolar full-scale error is the deviation of the last code
transition from ideal and includes the effect of offset error.
Note 9:
Guaranteed by design, not subject to test.
Note 10:
All specifications in dB are referred to a full-scale ±2.048V input
with a 4.096V reference voltage.
Note 11:
Full linear bandwidth is defined as the full-scale input frequency
at which the SINAD degrades to 60dB or 10 bits of accuracy.
C++ 属于面向对象的编程语言，OOP的思想不必多说，特别对于复杂的软件工程来说，利用OOP绝对是事半功倍，相对于传统的C来说； 当然用C来写单片机程序无可厚非，已经延续了一个传统，从大学时学的开始到工作岗位，好多人都是一直用C来做，但是既然Keil支持C++编译， 可以用C++来编写你的代码，可以利用高级语言来结构化，清晰化你的程序，为嘛不用呢！哈哈，个人看法！下面进入正题： C+...[详细]
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