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LTC2309
8-Channel, 12-Bit SAR ADC
with I2C Interface
FEATURES
n 12-Bit Resolution
n Low Power: 1.5mW at 1ksps, 35μW Sleep Mode
n 14ksps Throughput Rate
n Low Noise: SNR = 73.4dB
n Guaranteed No Missing Codes
www.DataShneetS4Uin.cgolme
n 2-wire
5V Supply
I2C Compatible
Serial
Interface
with
Nine
Addresses Plus One Global for Synchronization
n Fast Conversion Time: 1.3μs
n Internal Reference
n Internal 8-Channel Multiplexer
n Internal Conversion Clock
n Unipolar or Bipolar Input Ranges (Software Selectable)
n 24-Pin 4mm × 4mm QFN Package
APPLICATIONS
n Industrial Process Control
n Motor Control
n Accelerometer Measurements
n Battery-Operated Instruments
n Isolated and/or Remote Data Acquisition
n Power Supply Monitoring
DESCRIPTION
The LTC®2309 is a low noise, low power, 8-channel, 12-bit
successive approximation ADC with an I2C compatible
serial interface. This ADC includes an internal reference
and a fully differential sample-and-hold circuit to reduce
common mode noise. The LTC2309 operates from an
internal clock to achieve a fast 1.3μs conversion time.
The LTC2309 operates from a single 5V supply and
draws just 300μA at a throughput rate of 1ksps. The
ADC enters nap mode when not converting, reducing
the power dissipation.
The LTC2309 is available in a small 24-pin 4mm × 4mm
QFN package. The internal 2.5V reference and 8-channel
multiplexer further reduce PCB board space require-
ments.
The low power consumption and small size make the
LTC2309 ideal for battery-operated and portable applica-
tions, while the 2-wire I2C compatible serial interface makes
this ADC a good match for space-constrained systems.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
BLOCK DIAGRAM
10μF
0.1μF
5V
0.1μF
10μF
CH0
CH1
CH2
ANALOG INPUTS
CH3
0V TO 4.096V UNIPOLAR CH4
±2.048V BIPOLAR CH5
CH6
CH7
COM
AVDD
DVDD
LTC2309
ANALOG
INPUT
MUX
+ 12-BIT
SAR ADC
AD1
AD0
I2C
PORT
SCL
SDA
INTERNAL
2.5V REF
VREF
2.2μF
GND
0.1μF
REFCOMP
10μF
2309 TA01
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
Integral Nonlinearity
vs Output Code
1024
2048
3072
OUTPUT CODE
4096
2309 G01
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LTC2309
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (AVDD, DVDD) ...................... –0.3V to 6V
Analog Input Voltage (Note 3)
CH0-CH7, COM, VREF,
REFCOMP ...................(GND – 0.3V) to (AVDD + 0.3V)
Digital Input Voltage (Note 3).................(GND – 0.3V) to
(DVDD + 0.3V)
Digital Output Voltage .... (GND – 0.3V) to (DVDD + 0.3V)
Power Dissipation ...............................................500mW
www.DataShOeepte4Ura.ctoinmg Temperature Range
LTC2309C ................................................ 0°C to 70°C
LTC2309I.............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
24 23 22 21 20 19
CH3 1
CH4 2
CH5 3
CH6 4
CH7 5
COM 6
18 GND
17 SDA
16 SCL
25
15 AD1
14 AD0
13 AVDD
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 150°C, θJA = 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2309CUF#PBF
LTC2309CUF#TRPBF
2309
24-Lead (4mm × 4mm) Plastic QFN 0°C to 70°C
LTC2309IUF#PBF
LTC2309IUF#TRPBF
2309
24-Lead (4mm × 4mm) Plastic QFN –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/
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LTC2309
CONVERTER AND MULTIPLEXER CHARACTERISTICS The l denotes the specifications
which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 4, 5)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Resolution (No Missing Codes)
l 12
Bits
Integral Linearity Error
(Note 6)
l
±0.45 ±1
LSB
Differential Linearity Error
l
±0.35 ±1
LSB
Bipolar Zero Error
(Note 7)
l
±1 ±8
LSB
Bipolar Zero Error Drift
0.002
LSB/°C
Bipolar Zero Error Match
±0.1 ±3
LSB
Unipolar Zero Error
(Note 7)
l
±0.4 ±6
LSB
www.DataShUeneitp4oUla.croZmero Error Drift
Unipolar Zero Error Match
0.002
LSB/°C
±0.2 ±1
LSB
Bipolar Full-Scale Error
External Reference (Note 8)
REFCOMP = 4.096V
l
±0.5 ±10
LSB
l
±0.4 ±9
LSB
Bipolar Full-Scale Error Drift
External Reference
0.05 LSB/°C
Bipolar Full-Scale Error Match
±0.4 ±3
LSB
Unipolar Full-Scale Error
External Reference (Note 8)
REFCOMP = 4.096V
l
±0.4 ±10
LSB
l
±0.3 ±6
LSB
Unipolar Full-Scale Error Drift
External Reference
0.05 LSB/°C
Unipolar Full-Scale Error Match
±0.3 ±2
LSB
ANALOG INPUT The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. (Note 4)
SYMBOL
VIN+
VIN–
PARAMETER
Absolute Input Range (CH0 to CH7)
Absolute Input Range (CH0 to CH7, COM)
VIN+ – VIN– Input Differential Voltage Range
IIN Analog Input Leakage Current
CIN Analog Input Capacitance
CONDITIONS
(Note 9)
Unipolar (Note 9)
Bipolar (Note 9)
VIN = VIN+ – VIN– (Unipolar)
VIN = VIN+ – VIN– (Bipolar)
Sample Mode
Hold Mode
MIN TYP MAX UNITS
l –0.05
AVDD
l –0.05
l –0.05
AVDD/2
AVDD
l 0 to REFCOMP
l ±REFCOMP/2
V
V
V
V
V
l ±1 μA
55 pF
5 pF
CMRR Input Common Mode Rejection Ratio
70 dB
DYNAMIC ACCURACY The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. AIN = –1dBFS. (Notes 4, 10)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SINAD
SNR
THD
SFDR
Signal-to-(Noise + Distortion) Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious Free Dynamic Range
Channel-to-Channel Isolation
Full Linear Bandwidth
fIN = 1kHz
l 71
fIN = 1kHz
l 71
fIN = 1kHz, First 5 Harmonics
l
fIN = 1kHz
l 79
fIN = 1kHz
(Note 11)
73.3
73.4
–88 –77
90
–109
700
dB
dB
dB
dB
dB
kHz
–3dB Input Linear Bandwidth
25 MHz
Aperature Delay
13 ns
Transient Response
Full-Scale Step
240 ns
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LTC2309
INTERNAL REFERENCE CHARACTERISTICS The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VREF Output Voltage
VREF Output Tempco
VREF Output Impedance
IOUT = 0
IOUT = 0
–0.1mA ≤ IOUT ≤ 0.1mA
l 2.47 2.50 2.53
V
±25 ppm/°C
8 kΩ
VREFCOMP Output Voltage
VREF Line Regulation
IOUT = 0
AVDD = 4.75V to 5.25V
4.096
0.8
V
mV/V
I2C INPUTS AND DIGITAL OUTPUTS The l denotes the specifications which apply over the full
www.DataShoepeet4rUat.icnogmtemperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
VIH High Level Input Voltage
VIL Low Level Input Voltage
VIHA High Level Input Voltage for Address Pins A1, A0
VILA Low Level Input Voltage for Address Pins A1, A0
RINH Resistance from A1, A0, to VCC to Set Chip
Address Bit to 1
l 0.7VCC
l
l 0.95VCC
l
l
0.3VCC
0.05VCC
10
RINL Resistance from A1, A0 to GND to Set Chip
Address Bit to 0
l 10
RINF Resistance from A1, A0 to GND or VCC to Set
Chip Address Bit to Float
l2
II Digital Input Current
VHYS Hysteresis of Schmitt Trigger Inputs
(Note 9)
VOL Low Level Output Voltage (SDA)
I = 3mA
tOF Output Fall Time VH to VIL(MAX)
(Note 12)
tSP Input Spike Suppression
CCAX External Capacitance Load On Chip Address Pins
(A1, A0) for Valid Float
l –10
l 0.05VCC
l
l 20 + 0.1CB
l
l
10
0.4
250
50
10
UNITS
V
V
V
V
μA
V
V
ns
ns
pF
POWER REQUIREMENTS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
AVDD
DVDD
IDD
Analog Supply Voltage
Digital Supply Voltage
Supply Current
Nap Mode
Sleep Mode
14ksps Sample Rate
SLP Bit = 0, Conversion Done
SLP Bit = 1, Conversion Done
l 4.75 5 5.25
V
l 4.75 5 5.25
V
l 2.3 3 mA
l
210 350
μA
l 7 15 μA
PD Power Dissipation
Nap Mode
Sleep Mode
14ksps Sample Rate
SLP Bit = 0, Conversion Done
SLP Bit = 1, Conversion Done
11.5 15 mW
1.05 1.75 mW
35 75 μW
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LTC2309
I2C TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
fSCL SCL Clock Frequency
tHD(SDA) Hold Time (Repeated) Start Condition
tLOW Low Period of the SCL Pin
tHIGH High Period of the SCL Pin
tSU(STA) Set-Up Time for a Repeated Start Condition
tHD(DAT) Data Hold Time
tSU(DAT) Data Set-Up Time
www.DataShter et4U.comRise Time for SDA/SCL Signals
tf Fall Time for SDA/SCL Signals
tSU(STO) Set-Up Time for Stop Condition
tBUF Bus Free Time Between a Stop and Start Condition
(Note 12)
(Note 12)
l
l 0.6
l 1.3
l 0.6
l 0.6
l0
l 100
l 20 + 0.1CB
l 20 + 0.1CB
l 0.6
l 1.3
400
0.9
300
300
UNITS
kHz
μs
μs
μs
μs
μs
ns
ns
ns
μs
μs
ADC TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
fSMPL
tCONV
tACQ
tREFWAKE
Throughput Rate (Successive Reads)
Conversion Time
Acquisition Time
REFCOMP Wake-Up Time (Note 13)
(Note 9)
(Note 9)
CREFCOMP = 10μF, CREF = 2.2μF
l
l
l
14 ksps
1.3 1.8
μs
240 ns
200 ms
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 AVDD and DVDD
wired together (unless otherwise noted).
Note 3: When these pin voltages are taken below ground or above VDD,
they will be clamped by internal diodes. These products can handle input
currents greater than 100mA below ground or above VDD without latchup.
Note 4: AVDD = 5V, DVDD = 5V, fSMPL = 14ksps internal reference unless
otherwise noted.
Note 5: Linearity, offset and full-scale specifications apply for a
single-ended analog input with respect to COM.
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 2.5V 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.
Note 12: CB = capacitance of one bus line in pF (10pF ≤ CB ≤ 400pF).
Note 13: REFCOMP wake-up time is the time required for the REFCOMP
pin to settle within 0.5LSB at 12-bit resolution of its final value after
waking up from SLEEP mode.
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