LTC2320-16
Octal, 16-Bit, 1.5Msps/Ch
Simultaneous Sampling ADC
FEATURES
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DESCRIPTION
The
LTC
®
2320-16
is a low noise, high speed octal 16-bit
successive approximation register (SAR) ADC with
differential inputs and wide input common mode range.
Operating from a single 3.3V or 5V supply, the LTC2320-16
has an 8V
P-P
differential input range, making it ideal for
applications which require a wide dynamic range with high
common mode rejection. The LTC2320-16 achieves ±2LSB
INL typical, no missing codes at 16 bits and 82dB SNR.
The LTC2320-16 has an onboard low drift (20ppm/°C max)
2.048V or 4.096V temperature-compensated reference.
The LTC2320-16 also has a high speed SPI-compatible
serial interface that supports CMOS or LVDS. The fast
1.5Msps per channel throughput with no latency makes
the LTC2320-16 ideally suited for a wide variety of high
speed applications. The LTC2320-16 dissipates only 20mW
per channel and offers nap and sleep modes to reduce the
power consumption to 26μW for further power savings
during inactive periods.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
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1.5Msps/Ch Throughput Rate
Eight Simultaneously Sampling Channels
Guaranteed 16-Bit, No Missing Codes
8V
P-P
Differential Inputs with Wide Input
Common Mode Range
82dB SNR (Typ) at f
IN
= 500kHz
–90dB THD (Typ) at f
IN
= 500kHz
Guaranteed Operation to 125°C
Single 3.3V or 5V Supply
Low Drift (20ppm/°C Max) 2.048V or 4.096V
Internal Reference
1.8V to 2.5V I/O Voltages
CMOS or LVDS SPI-Compatible Serial I/O
Power Dissipation 20mW/Ch (Typ)
Small 52-Pin (7mm × 8mm) QFN Package
APPLICATIONS
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High Speed Data Acquisition Systems
Communications
Optical Networking
Multiphase Motor Control
TYPICAL APPLICATION
10µF
3.3V OR 5V
TRUE DIFFERENTIAL INPUTS
NO CONFIGURATION REQUIRED
IN
ARBITRARY
+
,
IN
–
1µF
1.8V TO 2.5V
A
IN1+
S/H
A
IN1–
A
IN2+
S/H
A
IN2–
A
IN3+
S/H
A
IN3–
A
IN4+
S/H
A
IN4–
A
IN5+
S/H
A
IN5–
A
IN6+
S/H
A
IN6–
A
IN7+
S/H
A
IN7–
A
IN8+
S/H
A
IN8–
REF
V
DD
MUX
GND
GND
OV
DD
32k Point FFT f
SMPL
= 1.5Msps,
f
IN
= 500kHz
SNR = 82.2dB
THD = –91.2dB
–20
SINAD = 81.8dB
SFDR = 94.7dB
–40
–60
–80
–100
–120
–140
0
0.1
0.2 0.3 0.4 0.5
FREQUENCY (MHz)
0.6
0.7
0
16-BIT
SAR ADC
CMOS/LVDS
SDR/DDR
REFBUFEN
IN
V
DD
V
DD
DIFFERENTIAL
0V
0V
LTC2320-16
MUX
16-BIT
SAR ADC
V
DD
BIPOLAR
V
DD
UNIPOLAR
CNV
16-BIT
SAR ADC
SAMPLE
CLOCK
0V
0V
MUX
REFOUT1
REFOUT2 REFOUT3 REFOUT4
232016 TA01a
EIGHT SIMULTANEOUS
SAMPLING CHANNELS
1µF
10µF
10µF
10µF
10µF
AMPLITUDE (dBFS)
MUX
16-BIT
SAR ADC
SDO1
SDO2
SDO3
SDO4
SDO5
SDO6
SDO7
SDO8
CLKOUT
SCK
232016 TA01b
232016fb
For more information
www.linear.com/LTC2320-16
1
LTC2320-16
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
REFBUFEN
DNC/SCK
–
CMOS/LVDS
SCK/SCK
+
40 SDO8/SDOD
–
39 SDO7/SDOD
+
38 GND
37 OV
DD
36 SDO6/SDOC
–
35 SDO5/SDOC
+
53
GND
34
CLKOUTEN/CLKOUT
–
33 CLKOUT/CLKOUT
+
32 GND
31 OV
DD
30 SDO4/SDOB
–
29 SDO3/SDOB
+
28 SDO2/SDOA
–
27 SDO1/SDOA
+
15 16 17 18 19 20 21 22 23 24 25 26
SDR/DDR
REFOUT1
A
IN2+
A
IN1–
A
IN1+
AI
IN2
GND
GND
CNV
V
DD
–
UKG PACKAGE
52-LEAD (7mm
×
8mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2320CUKG-16#PBF
LTC2320IUKG-16#PBF
LTC2320HUKG-16#PBF
TAPE AND REEL
http://www.linear.com/product/LTC2320-16#orderinfo
PART MARKING*
2320UKG-16
2320UKG-16
2320UKG-16
PACKAGE DESCRIPTION
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
LTC2320CUKG-16#TRPBF
LTC2320IUKG-16#TRPBF
LTC2320HUKG-16#TRPBF
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 channels with #TRMPBF suffix.
V
DD
Supply Voltage (V
DD
) ..................................................6V
Supply Voltage (OV
DD
) ................................................3V
Analog Input Voltage
A
IN+
, A
IN –
(Note 3) ................... –0.3V to (V
DD
+ 0.3V)
REFOUT1,2,3,4........................ .–0.3V to (V
DD
+ 0.3V)
CNV........................................
–0.3V to (OV
DD
+ 0.3V)
Digital Input Voltage
(Note 3) .......................... (GND – 0.3V) to (OV
DD
+ 0.3V)
Digital Output Voltage
(Note 3) .......................... (GND – 0.3V) to (OV
DD
+ 0.3V)
Operating Temperature Range
LTC2320C ................................................ 0°C to 70°C
LTC2320I .............................................–40°C to 85°C
LTC2320H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
TOP VIEW
REFOUT4
A
IN7+
A
IN7–
A
IN8+
A
IN8–
GND
GND
V
DD
V
DD
52 51 50 49 48 47 46 45 44 43 42 41
A
IN6
–
1
A
IN6+
2
GND 3
A
IN5
A
IN5
–
+
4
5
REFOUT3 6
GND 7
REF 8
REFOUT2 9
A
IN4
10
A
IN4
11
GND 12
A
IN3
13
A
IN3+
14
–
+
–
2
232016fb
For more information
www.linear.com/LTC2320-16
LTC2320-16
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN+
V
IN–
V
IN+
– V
IN–
V
CM
I
IN
C
IN
CMRR
V
IHCNV
V
ILCNV
I
INCNV
PARAMETER
Absolute Input Range (A
IN+
to A
IN–
)
Absolute Input Range (A
IN+
to A
IN–
)
Input Differential Voltage Range
Common Mode Input Range
Analog Input DC Leakage Current
Analog Input Capacitance
Input Common Mode Rejection Ratio
CNV
High Level Input Voltage
CNV
Low Level Input Voltage
CNV
Input Current
f
IN
= 500kHz
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C (Note 4).
CONDITIONS
(Note 5)
(Note 5)
V
IN
= V
IN+
– V
IN–
V
CM
= (V
IN+
– V
IN–
)/2
l
l
l
l
l
MIN
0
0
–REFOUT1,2,3,4
0
–1
TYP
MAX
V
DD
V
DD
REFOUT1,2,3,4
V
DD
1
UNITS
V
V
V
V
μA
pF
dB
V
10
102
1.5
0.5
–10
10
V
μA
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C (Note 4).
SYMBOL PARAMETER
Resolution
No Missing Codes
Transition Noise
Integral Linearity Error
Differential Linearity Error
Bipolar Zero-Scale Error
Bipolar Zero-Scale Error Drift
Bipolar Full-Scale Error
Bipolar Full-Scale Error Drift
CONDITIONS
l
l
CONVERTER CHARACTERISTICS
MIN
16
16
–12
–0.99
–12
–30
TYP
MAX
UNITS
Bits
Bits
INL
DNL
BZE
FSE
(Note 6)
(Note 7)
V
REFOUT1,2,3,4
= 4.096V (REFBUFEN Grounded) (Note 7)
V
REFOUT1,2,3,4
= 4.096V (REFBUFEN Grounded)
l
l
l
l
1.5
±2
±0.4
0
0.01
±10
15
12
0.99
12
30
LSB
RMS
LSB
LSB
LSB
LSB/°C
LSB
ppm/°C
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C and A
IN
= –1dBFS (Notes 4, 8).
SYMBOL PARAMETER
SINAD
SNR
THD
SFDR
CONDITIONS
l
DYNAMIC ACCURACY
MIN
75.5
76.5
TYP
81
81
82
82.5
–90
–91
93
93
55
500
500
1
30
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
MHz
ps
ps
ps
RMS
ns
232016fb
Signal-to-(Noise + Distortion) Ratio f
IN
= 500kHz, V
REFOUT1,2,3,4
= 4.096V, Internal Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 5V, External Reference
Signal-to-Noise Ratio
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 4.096V, Internal Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 5V, External Reference
Total Harmonic Distortion
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 4.096V, Internal Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 5V, External Reference
Spurious Free Dynamic Range
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 4.096V, Internal Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 5V, External Reference
–3dB Input Bandwidth
Aperture Delay
Aperture Delay Matching
Aperture Jitter
Transient Response
Full-Scale Step
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–78
l
78
For more information
www.linear.com/LTC2320-16
3
LTC2320-16
INTERNAL REFERENCE CHARACTERISTICS
SYMBOL
V
REFOUT1,2,3,4
PARAMETER
Internal Reference Output Voltage
V
REF
Temperature Coefficient
REFOUT1,2,3,4 Output Impedance
V
REFOUT1,2,3,4
Line Regulation
I
REFOUT1,2,3,4
External Reference Current
4.75V < V
DD
< 5.25V
REFBUFEN = 0V
REFOUT1,2,3,4 = 4.096V
REFOUT1,2,3,4 = 2.048V
(Notes 9, 10)
CONDITIONS
4.75V < V
DD
< 5.25V
3.13V < V
DD
< 3.47V
(Note 14)
l
l
l
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C (Note 4).
MIN
4.078
2.034
TYP
4.096
2.048
3
0.25
0.3
385
204
MAX
4.115
2.064
20
UNITS
V
V
ppm/°C
Ω
mV/V
μA
μA
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL PARAMETER
CMOS Digital Inputs and Outputs
CMOS/LVDS
= GND
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
OZ
I
SOURCE
I
SINK
V
ID
V
IS
V
OD
V
OS
V
OD_LP
V
OS_LP
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
LVDS Differential Input Voltage
LVDS Common Mode Input Voltage
LVDS Differential Output Voltage
LVDS Common Mode Output Voltage
Low Power LVDS Differential Output Voltage
Low Power LVDS Common Mode Output Voltage
I
O
= –500μA
I
O
= 500μA
V
OUT
= 0V to OV
DD
V
OUT
= 0V
V
OUT
= OV
DD
V
IN
= 0V to OV
DD
CONDITIONS
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C (Note 4).
MIN
l
l
l
l
l
l
l
l
l
TYP
MAX
UNITS
V
0.8 • OV
DD
0.2 • OV
DD
–10
5
OV
DD
– 0.2
0.2
–10
–10
10
240
1
220
0.85
100
0.85
350
1.2
200
1.2
600
1.45
600
1.4
350
1.4
10
10
V
μA
pF
V
V
μA
mA
mA
mV
V
mV
V
mV
V
LVDS Digital Inputs and Outputs
CMOS/LVDS
= OV
DD
100Ω Differential Termination
OV
DD
= 2.5V
100Ω Differential Termination
OV
DD
= 2.5V
100Ω Differential Termination
OV
DD
= 2.5V
100Ω Differential Termination
OV
DD
= 2.5V
100Ω Differential Termination
OV
DD
= 2.5V
100Ω Differential Termination
OV
DD
= 2.5V
l
l
l
l
l
l
4
232016fb
For more information
www.linear.com/LTC2320-16
LTC2320-16
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C (Note 4).
SYMBOL
V
DD
IV
DD
CMOS I/O Mode
OV
DD
I
OVDD
I
NAP
I
SLEEP
P
D_3.3V
P
D_5V
PARAMETER
Supply Voltage
Supply Current
CMOS/LVDS
= GND
Supply Voltage
Supply Current
Nap Mode Current
Sleep Mode Current
Power Dissipation
1.5Msps Sample Rate (C
L
= 5pF)
Conversion Done (I
VDD
)
Sleep Mode (I
VDD
+ I
OVDD
)
V
DD
= 3.3V, 1.5Msps Sample Rate
Nap Mode
Sleep Mode
V
DD
= 5V, 1.5Msps Sample Rate
Nap Mode
Sleep Mode
l
l
l
l
l
l
l
l
l
l
POWER REQUIREMENTS
CONDITIONS
5V Operation
3.3V Operation
1.5Msps Sample Rate (IN
+
= IN
–
= 0V)
l
l
l
MIN
4.75
3.13
TYP
MAX
5.25
3.47
UNITS
V
V
mA
V
mA
mA
µA
mW
mW
µW
mW
mW
µW
V
mA
mA
µA
mW
mW
µW
mW
mW
µW
31
1.71
4.4
5.3
20
102
18
20
162
27
30
2.37
26
5.3
20
151
52
80
214
52
30
39
2.63
8
6.9
110
133
22.7
355
210
34.4
525
2.63
38
6.9
110
248
61.5
355
300
73
525
Power Dissipation
LVDS I/O Mode
OV
DD
I
OVDD
I
NAP
I
SLEEP
P
D_3.3V
P
D_5V
CMOS/LVDS
= OV
DD
, OV
DD
= 2.5V
Supply Voltage
Supply Current
Nap Mode Current
Sleep Mode Current
Power Dissipation
1.5Msps Sample Rate (C
L
= 5pF, R
L
= 100Ω)
Conversion Done (I
VDD
)
Sleep Mode (I
VDD
+ I
OVDD
)
V
DD
= 3.3V, 1.5Msps Sample Rate
Nap Mode
Sleep Mode
V
DD
= 5V, 1.5Msps Sample Rate
Nap Mode
Sleep Mode
l
l
l
l
l
l
l
l
l
l
Power Dissipation
232016fb
For more information
www.linear.com/LTC2320-16
5
编程基础
