Document
FEATURES
LTC2336-18 18-Bit, 250ksps, ±10.24V True Bipolar, Fully Differential Input ADC with 100dB SNR DESCRIPTION
nn 250ksps Throughput Rate nn ±4LSB INL (Max) nn Guaranteed 18-Bit No Missing Codes nn Fully Differential Inputs nn True Bipolar Input Ranges ±6.25V, ±10.24V, ±12.5V nn 100dB SNR (Typ) at fIN = 2kHz nn –115dB THD (Typ) at fIN = 2kHz nn Guaranteed Operation to 125°C nn Single 5V Supply nn Low Drift (20ppm/°C Max) 2.048V Internal Reference nn Onboard Single-Shot Capable Reference Buffer nn No Pipeline Delay, No Cycle Latency nn 1.8V to 5V I/O Voltages nn SPI-Compatible Serial I/O with Daisy-Chain Mode nn Internal Conversion Clock nn Power Dissipation 28mW (Typ) nn 16-Lead MSOP Package
APPLICATIONS
nn Programmable Logic Controllers nn Industrial Process Control nn High Speed Data Acquisition nn Portable or Compact Instrumentation nn ATE
The LTC®2336-18 is a low noise, high speed 18-bit successive approximation register (SAR) ADC with fully differential inputs. Operating from a single 5V supply, the LTC2336-18 has a ±10.24V true bipolar input range, making it ideal for high voltage applications which require a wide dynamic range. The LTC2336-18 achieves ±4LSB INL maximum, no missing codes at 18-bits with 100dB SNR. The LTC2336-18 has an onboard single-shot capable reference buffer and low drift (20ppm/°C max) 2.048V temperature compensated reference. The LTC2336-18 also has a high speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisy-chain mode. The fast 250ksps throughput with no cycle latency makes the LTC2336-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2336-18 dissipates only 28mW and automatically naps between conversions, leading to reduced power dissipation that scales with the sampling rate. A sleep mode is also provided to reduce the power consumption of the LTC2336-18 to 300μW for further power savings during inactive periods.
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TYPICAL APPLICATION
+10.24V
–10.24V +10.24V
–10.24V
+ –
5V 10µF
1.8V TO 5V
2.2µF
0.1µF
VDD IN+
VDDLBYP OVDD
LTC2336-18
IN–
RERFEBFUF
REFIN
GND
47µF
100nF
CHAIN RDL/SDI
SDO SCK BUSY CNV
233618 TA01
SAMPLE CLOCK
For more information www.linear.com/LTC2336-18
AMPLITUDE (dBFS)
0 –20 –40 –60 –80 –100 –120 –140 –160 –180
0
32k Point FFT fS = 250ksps, fIN = 2kHz
SNR = 100.3dB THD = –117dB SINAD = 100.2dB SFDR = –118dB
25 50 75 100 125 FREQUENCY (kHz)
233618 TA01b
233618fa
1
LTC2336-18
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VDD)...................................................6V Supply Voltage (OVDD)..........................................