Document
LTC2389-16
16-Bit, 2.5Msps SAR ADC with Pin-Configurable Analog
Input Range and 96dB SNR
Features
Description
n 2.5Msps Throughput Rate n ±1LSB INL (Max) n Guaranteed 16-Bit, No Missing Codes n Pin-Configurable Analog Input Range: ±4.096V Fully Differential 0V to 4.096V Pseudo-Differential Unipolar ±2.048V Pseudo-Differential Bipolar n 96.0dB (Fully Differential)/93.5dB (Pseudo
Differential) SNR (Typ) at fIN = 2kHz n –116dB (Fully Differential)/–112dB (Pseudo
Differential) THD (Typ) at fIN = 2kHz n Guaranteed Operation to 125°C n Single 5V Supply n Internal 20ppm/°C (Max) Reference n Internal Reference Buffer n 162.5mW Power Dissipation at 2.5Msps n No Pipeline Delay, No Cycle Latency n 1.8V to 5V I/O Voltages n Parallel and Serial I/O Interface n 48-pin 7mm × 7mm LQFP and QFN Packages
Applications
n Medical Imaging n High Speed, Wide Dynamic Range Data Acquisition n Industrial Process Control n Instrumentation n ATE
The LTC®2389-16 is a low noise, high speed 16-bit successive approximation register (SAR) ADC. Operating from a single 5V supply, the LTC2389-16 supports pinconfigurable fully differential (±4.096V), pseudo-differential unipolar (0V to 4.096V), and pseudo-differential bipolar (±2.048V) analog input ranges, allowing it to interface with multiple signal chain formats without requiring additional level translation or signal conditioning. The LTC2389-16 achieves ±1LSB INL (maximum), no missing codes at 16-bits, and 96.0dB (fully differential)/ 93.5dB (pseudo differential) SNR (typical). The LTC2389-16 includes a precision internal 4.096V reference, with a guaranteed 0.5% initial accuracy and a ±20ppm/°C (maximum) temperature coefficient, as well as an internal reference buffer. Fast 2.5Msps throughput with no cycle latency in the parallel interface modes makes the LTC2389-16 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2389-16 dissipates only 162.5mW at 2.5Msps, while both nap and sleep power-down modes are provided to further reduce power consumption 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.
typical application
5V 1.8V TO 5V
4.096V 0V 0V
4.096V 0V
4.096V 0V
4.096V 0V
2.048V
10µF 0.1µF
0.1µF
10µF
VDD OVDD
PARALLEL OR SERIAL INTERFACE
16 BIT
10Ω 49.9Ω IN+
+ 1nF
A0 A1 MODE0 MODE1
LTC2389-16
RESET
– 10Ω 1nF IN–
49.9Ω
PD CS OB/2C PD/FD BUSY
VCM REFOUT REFIN REFSENSE GND
CNVST
SAMPLE CLOCK
10µF
238916 TA01a
1µF
32k Point FFT fSMPL = 2.5Msps, fIN = 2kHz
AMPLITUDE (dBFS)
0 SNR = 96.0dB –20 THD = –116dB
SINAD = 96.0dB –40 SFDR = 117dB
–60
–80
–100
–120
–140
–160
–180 0
250 500 750 1000 1250
FREQUENCY (kHz)
238916 TA01b
238916f
1
LTC2389-16
Absolute Maximum Ratings (Notes 1, 2)
Supply Voltage (VDD , OVDD)........................................6V Analog Input Voltage (Note 3) IN+, IN–, REFIN, CNVST......(GND – 0.3V) to (VDD + 0.3V) 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 LTC2389C................................................. 0°C to 70°C LTC2389I..............................................–40°C to 85°C LTC2389H........................................... –40°C to 125°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) LX Package........................................................ 300°C
Pin Configuration
TOP VIEW
TOP VIEW
48 GND 47 VDD 46 VDD 45 VDD 44 GND 43 IN+ 42 IN– 41 GND 40 VDD 39 REFSENSE 38 REFIN 37 REFOUT
37 REFOUT
38 REFIN
40 VDD 39 REFSENSE
41 GND
IIGNNN–+D
45 VDD
46 VDD
47 VDD
48 GND
44 43 42
GND 1 VDD 2 VDD 3 MODE0 4 MODE1 5 OB/2C 6
A0 7 A1 8 D0 9 D1 10 D2 11 D3 12
36 VCM 35 GND 34 CNVST 33 PD 32 RESET 31 CS 30 PD/FD 29 BUSY 28 D15 27 D14 26 D13 25 D12
GND 1
36 VCM
VDD 2 VDD 3 MODE0 4
35 GND 34 CNVST 33 PD
MODE1 5
32 RESET
OB/2C 6 49 31 CS A0 7 GND 30 PD/FD
A1 8
29 BUSY
D0 9
28 D15
D1 10
27 D14
D2 11
26 D13
D3 12
25 D12
D4 13 D5 14 D6 15 D7 16 GND 17 OVDD 18 VDD 19 GND 20 D8 21 D9/SDI 22 D10/SDO 23 D11/SCK 24
D4 13 D5 14 D6 15 D7 16 GND 17 OVDD 18 VDD 19 GND 20 D8 21 D9/SDI 22 D10/SDO 23 D11/SCK 24
LX PACKAGE 48-LEAD (7mm × 7mm) PLASTIC LQFP
TJMAX = 150°C, θJA = 50°C/W
UK PACKAGE 48-LEAD (7mm × 7mm) PLASTIC QFN
TJMAX = 125°C, θJA = 29°C/W EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2389CUK-16#PBF
LTC2389CUK-16#TRPBF LTC2389UK-16
48-Lead.