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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 pin-
configurable fully differential (±4.096V), pseudo-differ-
ential unipolar (0V to 4.096V), and pseudo-differential
bipolar (±2.048V) analog input ranges, allowing it to
interface with multiple signal chain formats without re-
quiring 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 considera-
tions. 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
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
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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
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
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 7mm × 7mm Plastic QFN
0°C to 70°C
LTC2389IUK-16#PBF
LTC2389IUK-16#TRPBF LTC2389UK-16
48-Lead 7mm × 7mm Plastic QFN
–40°C to 85°C
LEAD FREE FINISH
TRAY
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2389CLX-16#PBF
LTC2389CLX-16#PBF LTC2389LX-16
48-Lead 7mm × 7mm Plastic LQFP
0°C to 70°C
LTC2389ILX-16#PBF
LTC2389ILX-16#PBF
LTC2389LX-16
48-Lead 7mm × 7mm Plastic LQFP
–40°C to 85°C
LTC2389HLX-16#PBF
LTC2389HLX-16#PBF LTC2389LX-16
48-Lead 7mm × 7mm Plastic LQFP
–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.
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/
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LTC2389-16
Analog Input The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. (Note 4)
SYMBOL
VIN+
VIN–
VIN+ – VIN–
VCM
IIN
CIN
CMRR
VIHCNVST
VILCNVST
IINCNVST
PARAMETER
Absolute Input Range (IN+)
Absolute Input Range (IN)
CONDITIONS
(Note 5)
Fully Differential (Note 5)
Pseudo-Differential Unipolar (Note 5)
Pseudo-Differential Bipolar (Note 5)
Input Differential Voltage Range
Fully Differential
Pseudo-Differential Unipolar
Pseudo-Differential Bipolar
Input Common Mode Voltage Range Fully Differential
Analog Input Leakage Current
C- and I-Grades
H-Grade
Analog Input Capacitance
Sample Mode
Hold Mode
Input Common Mode Rejection Ratio
CNVST High Level Input Voltage
CNVST Low Level Input Voltage
CNVST Input Current
VIN = 0V to VDD
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
–0.1
–0.1
–0.1
VREF/2 – 0.1
–VREF
0
–VREF / 2
VREF/2 – 0.1
–1
–2
1.5
TYP
0
VREF / 2
VREF / 2
45
5
70
–25
MAX
VREF + 0.1
VREF + 0.1
0.1
VREF/2 + 0.1
VREF
VVRREFE/F2
VREF/2 + 0.1
1
2
0.5
–60
UNITS
V
V
V
V
V
V
V
V
µA
µA
pF
pF
dB
V
V
µA
C onverter Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL
PARAMETER
Resolution
No Missing Codes
Transition Noise
INL Integral Linearity Error
DNL Differential Linearity Error
ZSE Zero-Scale Error
Zero-Scale Error Drift
FSE Full-Scale Error
Full-Scale Error Drift
CONDITIONS
Fully Differential
Pseudo-Differential Unipolar
Pseudo-Differential Bipolar
Fully Differential (Note 6)
Pseudo-Differential Unipolar (Note 6)
Pseudo-Differential Bipolar (Note 6)
Fully Differential
Pseudo-Differential Unipolar
Pseudo-Differential Bipolar
Fully Differential (Note 7)
Pseudo-Differential Unipolar (Note 7)
Pseudo-Differential Bipolar (Note 7)
External Reference (Note 7)
Internal Reference (Note 7)
MIN
l 16
l 16
l –1
l –1
l –1
l –0.6
l –0.7
l –0.7
l –3
l –4
l –4
l
TYP
0.19
0.38
0.38
±0.3
±0.3
±0.3
±0.1
±0.1
±0.1
0
0
0
±0.05
±5
MAX UNITS
Bits
Bits
LSBRMS
LSBRMS
LSBRMS
1 LSB
1 LSB
1 LSB
0.6 LSB
0.7 LSB
0.7 LSB
3 LSB
4 LSB
4 LSB
ppm/°C
0.15 %
0.15 %
ppm/°C
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LTC2389-16
Dynamic Accuracy The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. AIN = –1dBFS (Notes 4, 8)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SINAD
Signal-to-(Noise +
Distortion) Ratio
Fully Differential, fIN = 2kHz
Pseudo-Differential Unipolar, fIN = 2kHz
Pseudo-Differential Bipolar, fIN = 2kHz
l 94.4
l 91.2
l 91.7
96.0
93.2
93.5
Fully Differential, fIN = 2kHz (H-Grade)
Pseudo-Differential
Pseudo-Differential
BUinpioploalra,rf,INfIN==2k2HkHz z(H(H-G-Grardaed)e)
l 94.3
l 91.0
l 91.5
96.0
93.2
93.5
SNR Signal-to-Noise Ratio FPuslelyudDoif-fDeirfefenrteianl,tifaIlNU=n2ipkoHlazr, fIN = 2kHz
Pseudo-Differential Bipolar, fIN = 2kHz
l 95.1
l 91.7
l 92.1
96.0
93.2
93.5
Fully Differential, fIN = 2kHz (H-Grade)
Pseudo-Differential Unipolar, fIN = 2kHz (H-Grade)
Pseudo-Differential Bipolar, fIN = 2kHz (H-Grade)
l 94.9
l 91.5
l 91.9
96.0
93.2
93.5
THD Total Harmonic
Distortion
Fully Differential, fIN = 2kHz, First 5 Harmonics
Pseudo-Differential Unipolar, fIN = 2kHz, First 5 Harmonics
Pseudo-Differential Bipolar, fIN = 2kHz, First 5 Harmonics
l
l
l
–116 –103
–112 –101
–111 –102
FPPussleelyuuddDooif--fDDeiirffeffeenrrteeiannl,ttiifaaIllNBU=inp2iopkloHalraz,,rf,FINfiIrNs=t=25k2HHkHaz,rzmF, iForisnrtsic5ts5H(HaHra-mGrmoranodinceis)cs(H(H-G-Grardaed)e)
l
l
l
–116 –103
–112 –101
–111 –102
SFDR
Spurious-Free
Dynamic Range
Fully Differential, fIN = 2kHz
Pseudo-Differential Unipolar, fIN = 2kHz
Pseudo-Differential Bipolar, fIN = 2kHz
l 104
l 102
l 102
117
113
112
Fully Differential, fIN = 2kHz (H-Grade)
Pseudo-Differential Unipolar, fIN = 2kHz (H-Grade)
Pseudo-Differential Bipolar, fIN = 2kHz (H-Grade)
l 103
l 102
l 102
117
113
112
–3dB Input Bandwidth
50
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
MHz
Aperture Delay
0.5 ns
Aperture Jitter
Transient Response
Full-Scale Step
1 psRMS
70 ns
R eference Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VREFOUT
VREF
Internal Reference Voltage
VREFOUT Tempco
REFOUT Output Impedance
REFOUT Line Regulation
Converter REFIN Voltage
REFIN Input Impedance
REFOUT Tied to REFIN, IOUT = 0µA
IOUT = 0µA (Note 9)
–0.1mA ≤ IOUT ≤ 0.1mA
VDD = 4.75V to 5.25V
4.076
l
4.076
4.096
±10
2.3
0.3
4.096
74
4.116
±20
4.116
V
ppm/°C
mV/ V
V
VCM Output Voltage
IOUT = 0µA
2.08 V
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LTC2389-16
D igital Inputs And Digital Outputs The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIH
VIL
IIN
CIN
VOH
VOL
IOZ
ISOURCE
ISINK
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage Current
Output Source Current
Output Sink Current
VIN = 0V to OVDD
IOUT = –500µA
IOUT = 500µA
VOUT = 0V to OVDD
VOUT = 0V
VOUT = OVDD
l 0.8 • OVDD
l
l –10
0.2 • OVDD
10
5
l OVDD – 0.2
l
0.2
l –10
10
–10
10
V
V
µA
pF
V
V
µA
mA
mA
Power Requirements The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VDD
OVDD
IVDD
Supply Voltage
Supply Voltage
Core Supply Current
l 4.75 5 5.25
l 1.71
5.25
2.5Msps Sample Rate
2.5Msps Sample Rate, Internal Reference Enabled
l
32.5 36
34.1
V
V
mA
mA
IOVDD
IPD
PD
I/O Supply Current
Power Down Current
(IVDD + IOVDD)
Power Dissipation
2.5Msps Sample Rate (CL = 15pF)
Conversion Done, PD = OVDD, Other Digital Inputs
Tied to OVDD or GND
2.5Msps Sample Rate
Conversion Done, PD = OVDD, Other Digital Inputs
Tied to OVDD or GND
l
1.6
15
162.5
75
250
180
1250
mA
µA
mW
µW
Timing Characteristics The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
fSMPL
Sampling Frequency
Parallel Output Modes
Serial Output Mode
l
l
2.5 Msps
2.0 Msps
tCONV
tACQ
tCYC
tCNVSTL
tCNVSTH
tBUSYLH
tRESETH
tSCK
tSCKH
tSCKL
tDSCK
tSSDI
Conversion Time
Acquisition Time
Time Between CNVST
CNVST Low Time
CNVST High Time
CNVSTto BUSY Delay
RESET Pulse Width
SCK Period
SCK High Time
SCK Low Time
SCKDelay From CS
SDI Setup Time From SCK
l 245 280 310
tACQ = tCYC – tCONV – tBUSYLH (Note 10)
l 77
l 400
110
l 20
l 200
CL = 15pF
l
l 200
13
(Notes 5, 11)
l 10
l4
l4
l 10
l2
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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