Document
FEATURES
LTC2337-18 18-Bit, 500ksps, ±10.24V True Bipolar, Fully Differential Input ADC with 100dB SNR DESCRIPTION
nn 500ksps 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 35mW (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®2337-18 is a low noise, high speed 18-bit successive approximation register (SAR) ADC with fully differential inputs. Operating from a single 5V supply, the LTC2337-18 has a ±10.24V true bipolar input range, making it ideal for high voltage applications which require a wide dynamic range. The LTC2337-18 achieves ±4LSB INL maximum, no missing codes at 18-bits with 100dB SNR. The LTC2337-18 has an onboard single-shot capable reference buffer and low drift (20ppm/°C max) 2.048V temperature compensated reference. The LTC2337-18 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 500ksps throughput with no cycle latency makes the LTC2337-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2337-18 dissipates only 35mW 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 LTC2337-18 to 300μW for further power savings during inactive periods.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7705765 and 7961132
TYPICAL APPLICATION
+10.24V
–10.24V +10.24V
–10.24V
+ –
5V 10µF
1.8V TO 5V
2.2µF
0.1µF
VDD IN+
VDDLBYP OVDD
LTC2337-18
IN–
RERFEBFUF
REFIN
GND
47µF
100nF
CHAIN RDL/SDI
SDO SCK BUSY CNV
233718 TA01
SAMPLE CLOCK
For more information www.linear.com/LTC2337-18
AMPLITUDE (dBFS)
0 –20 –40 –60 –80 –100 –120 –140 –160 –180
0
32k Point FFT fS = 500ksps, fIN = 2kHz
SNR = 100.4dB THD = –116dB SINAD = 100.3dB SFDR = –118dB
50 100 150 200 250 FREQUENCY (kHz)
233718 TA01b
233718fa
1
LTC2337-18
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VDD)...................................................6V Supply Voltage (OVDD).................................................6V Supply Bypass Voltage (VDDLBYP)............................3.2V Analog Input Voltage
IN+, IN–...............................................–16.5V to 16.5V REFBUF....................................................................6V REFIN ...................................................................2.8V Digital Input Voltage (Note 3)............................ (GND –0.3V) to (OVDD + 0.3V) Digital Output Voltage (Note 3)............................ (GND –0.3V) to (OVDD + 0.3V) Power Dissipation............................................... 500mW Operating Temperature Range LTC2337C................................................. 0°C to 70°C LTC2337I..............................................–40°C to 85°C LTC2337H........................................... –40°C to 125°C Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
VDDLGVBIINDNNYDDP+–
1 2 3 4 5
GND 6
REFBUF 7
REFIN 8
16 GND
15 14
SODVDOD
13 SCK
12 RDL/SDI
11 BUSY
10 CHAIN
9 CNV
MS PACKAGE 16-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 110°C/W
ORDER INFORMATION http://www.linear.com/product/LTC2337-18#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2337CMS-18#PBF
LTC2337CMS-18#TRPBF 233718
16-Lead Plastic MSOP
0°C to 70°C
LTC2337IMS-18#PBF
LTC2337IMS-18#TRPBF 233718
16-Lead Plastic MSOP
–40°C to 85°C
LTC2337HMS-18#PBF LTC2337HMS-18#TRPBF 233718
16-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/. Some packages are available in 500 unit reels through designated sales cha.