LTC2302 Datasheet, PDF (1/20 Pages) Linear Technology – Low Noise, 500ksps, 1-/2-Channel, 12-Bit ADCs

FEATURES
n _{12-Bit Resolution}
n _{500ksps Sampling Rate}
n _{Low Noise: SINAD = 72.8dB}
n _{Guaranteed No Missing Codes}
n _{Single 5V Supply}
n _{Auto-Shutdown Scales Supply Current with Sample}
Rate
n _{Low Power: 14mW at 500ksps}
70μW at 1ksps
35μW Sleep Mode
n _{1-Channel (LTC2302) and 2-Channel (LTC2306)}
Versions
n _{Unipolar or Bipolar Input Ranges (Software}
Selectable)
n _{Internal Conversion Clock}
n _{SPI/MICROWIRE}™ _{Compatible Serial Interface}
n _{Separate Output Supply OVDD (2.7V to 5.25V)}
n _{Software Compatible with the LTC2308}
n _{10-Pin (3mm × 3mm) DFN Package}
APPLICATIONS
n _{High Speed Data Acquisition}
n _{Industrial Process Control}
n _{Motor Control}
n _{Accelerometer Measurements}
n _{Battery-Operated Instruments}
n _{Isolated and/or Remote Data Acquisition}
LTC2302/LTC2306
Low Noise, 500ksps,
1-/2-Channel, 12-Bit ADCs
DESCRIPTION
The LTC^®2302/LTC2306 are low noise, 500ksps, 1-/2-chan-
nel, 12-bit ADCs with an SPI/MICROWIRE compatible
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
NUMBER OF INPUT CHANNELS
1
2
8
LTC2308
LTC2302
LTC2306
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
10μF
0.1μF
0.1μF
2.7V TO 5.25V
V_DD
OV_DD
ANALOG INPUTS _{CH0 (IN}+₎
0V TO 4.096V UNIPOLAR
±2.048V BIPOLAR ^{CH1 (IN–)}
ANALOG
INPUT
MUX
+
12-BIT
–
500ksps
ADC
PIN NAMES IN PARENTHESIS
REFER TO LTC2302
GND
LTC2302
LTC2306
SERIAL
PORT
SDI
SDO
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
SCK
OR SHIFT REGISTER
CONVST
0.1μF
V_REF
10μF
23026 TA01
8192 Point FFT, f_IN = 1kHz (LTC2306)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
0
f_SMPL = 500kHz
SINAD = 72.8dB
THD = –88.7dB
50 100 150 200 250
FREQUENCY (kHz)
23026 TA01b
23026f
1