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Linear Technology Electronic Components Datasheet

LTC2308 Datasheet

12-Bit ADC

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LTC2308 pdf
LTC2308
Low Noise, 500ksps,
8-Channel, 12-Bit ADC
FEATURES
12-Bit Resolution
500ksps Sampling Rate
Low Noise: SINAD = 73.3dB
Guaranteed No Missing Codes
www.DataSheetS4Uin.cgolme 5V Supply
Auto-Shutdown Scales Supply Current with Sample
Rate
Low Power: 17.5mW at 500ksps
0.9mW Nap Mode
35μW Sleep Mode
Internal Reference
Internal 8-Channel Multiplexer
Internal Conversion Clock
SPI/MICROWIRETM Compatible Serial Interface
Unipolar or Bipolar Input Ranges (Software Selectable)
Separate Output Supply OVDD (2.7V to 5.25V)
24-Pin 4mm × 4mm QFN Package
APPLICATIONS
High Speed Data Acquisition
Industrial Process Control
Motor Control
Accelerometer Measurements
Battery Operated Instruments
Isolated and/or Remote Data Acquisition
DESCRIPTION
The LTC®2308 is a low noise, 500ksps, 8-channel, 12-bit
ADC with an SPI/MICROWIRE compatible serial interface.
This ADC includes an internal reference and a fully differ-
ential 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 LTC2308 operates from a single 5V supply and draws
just 3.5mA at a sample rate of 500ksps. The auto-shutdown
feature reduces the supply current to 200μA at a sample
rate of 1ksps.
The LTC2308 is packaged in a small 24-pin 4mm × 4mm
QFN. The internal 2.5V reference and 8-channel multiplexer
further reduce PCB board space requirements.
The low power consumption and small size make the
LTC2308 ideal for battery operated and portable appli-
cations, while the 4-wire SPI compatible serial interface
makes this ADC a good match for isolated or remote data
acquisition systems.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V
0.1μF
10μF
10μF 0.1μF
CH0
CH1
CH2
CH0-CH7
CH3
ANALOG INPUTS CH4
0V TO 4.096V UNIPOLAR
p2.048V BIPOLAR
CH5
CH6
CH7
COM
AVDD
ANALOG
INPUT
MUX
+
DVDD
LTC2308
OVDD
2.7V TO 5.25 V
0.1μF
12-BIT
500ksps
ADC
SERIAL
PORT
INTERNAL
2.5V REF
SDI
SDO SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
SCK OR SHIFT REGISTER
CONVST
VREF
2.2μF
GND
0.1μF
REFCOMP
10μF
2308 TA01
8192 Point FFT, fIN = 1kHz
0
–10 fSMPL = 500kHz
–20
SINAD = 73.6dB
THD = –89.5dB
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
0
50 100 150 200 250
FREQUENCY (kHz)
2308 G03
2308f
1


Linear Technology Electronic Components Datasheet

LTC2308 Datasheet

12-Bit ADC

No Preview Available !

LTC2308 pdf
LTC2308
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (AVDD, DVDD, OVDD)...........................6V
Analog Input Voltage (Note 3)
CH0 - CH7, COM, REF,
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 (OVDD + 0.3V)
Power Dissipation ...............................................500mW
www.DataShOeepte4Ura.ctoinmg Temperature Range
LTC2308C ................................................ 0°C to 70°C
LTC2308I ............................................. –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 SD0
16 SCK
25
15 SDI
14 CONVST
13 AVDD
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 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
LTC2308CUF#PBF
LTC2308IUF#PBF
LTC2308CUF#TRPBF
LTC2308IUF#TRPBF
2308
2308
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
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/
CONVERTER AND MULTIPLEXER CHARACTERISTICS The 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)
12
Bits
Integral Linearity Error
(Note 6)
±0.3 ±1
LSB
Differential Linearity Error
±0.25 ±1
LSB
Bipolar Zero Error
(Note 7)
±1 ±6
LSB
Bipolar Zero Error Drift
0.002
LSB/°C
Bipolar Zero Error Match
±0.3 ±3
LSB
Unipolar Zero Error
(Note 7)
±0.5 ±3
LSB
Unipolar Zero Error Drift
0.002
LSB/°C
Unipolar Zero Error Match
±0.3 ±2
LSB
2308f
2


Part Number LTC2308
Description 12-Bit ADC
Maker Linear Technology Corporation
Total Page 20 Pages
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