FEATURES
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LTC2320-12
Octal, 12-Bit + Sign,
1.5Msps/Ch Simultaneous
Sampling ADC
DESCRIPTION
The
LTC
®
2320-12
is a low noise, high speed octal 12-bit
+ sign successive approximation register (SAR) ADC with
differential inputs and wide input common mode range.
Operating from a single 3.3V or 5V supply, the LTC2320-12
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 LTC2320-12 achieves
±0.25LSB INL typical, no missing codes at 12 bits and
77dB SNR.
The LTC2320-12 has an onboard low drift (20ppm/°C max)
2.048V or 4.096V temperature-compensated reference.
The LTC2320-12 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 LTC2320-12 ideally suited for a wide variety of high
speed applications. The LTC2320-12 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.
All registered trademarks and trademarks are the property of their respective owners.
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1.5Msps/Ch Throughput Rate
Eight Simultaneously Sampling Channels
Guaranteed 12-Bit, No Missing Codes
8V
P-P
Differential Inputs with Wide Input
Common Mode Range
77dB 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-Lead (7mm × 8mm) QFN Package
APPLICATIONS
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High Speed Data Acquisition Systems
Communications
Remote Data Acquisition
Imaging
Optical Networking
Automotive
Multiphase Motor Control
10µF
3.3V OR 5V
V
DD
MUX
GND
GND
1µF
TYPICAL APPLICATION
TRUE DIFFERENTIAL INPUTS
NO CONFIGURATION REQUIRED
IN
+
,
IN
–
ARBITRARY
DIFFERENTIAL
1.8V TO 2.5V
OV
DD
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
32k Point FFT f
SMPL
= 1.5Msps,
f
IN
= 500kHz
SNR = 78.4dB
THD = –90.9dB
–20 SINAD = 78.2dB
SFDR = 95.2dB
–40
–60
–80
–100
–120
–140
0
0.1
0.2 0.3 0.4 0.5
FREQUENCY (MHz)
0.6
0.7
0
12-BIT
+ SIGN
SAR ADC
CMOS/LVDS
SDR/DDR
REFBUFEN
V
DD
V
DD
0V
0V
LTC2320-12
MUX
12-BIT
+ SIGN
SAR ADC
V
DD
BIPOLAR
V
DD
UNIPOLAR
CNV
12-BIT
+ SIGN
SAR ADC
SAMPLE
CLOCK
0V
0V
MUX
REFOUT1 REFOUT2 REFOUT3 REFOUT4
232012 TA01a
EIGHT SIMULTANEOUS
SAMPLING CHANNELS
1µF
10µF
10µF
10µF
10µF
AMPLITUDE (dBFS)
MUX
12-BIT
+ SIGN
SAR ADC
SDO1
SDO2
SDO3
SDO4
SDO5
SDO6
SDO7
SDO8
CLKOUT
SCK
232012 TA01b
Document Feedback
For more information
www.analog.com
1
Rev B
LTC2320-12
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
REFOUT1
SDR/DDR
CNV
A
IN2+
GND
A
IN1+
A
IN2
A
IN1
GND
–
V
DD
UKG PACKAGE
52-LEAD (7mm
×
8mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 31°C/W
EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2320CUKG-12#PBF
LTC2320IUKG-12#PBF
LTC2320HUKG-12#PBF
TAPE AND REEL
http://www.linear.com/product/LTC2320-12#orderinfo
PART MARKING*
LTC2320UKG-12
LTC2320UKG-12
LTC2320UKG-12
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-12#TRPBF
LTC2320IUKG-12#TRPBF
LTC2320HUKG-12#TRPBF
Consult ADI 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
Rev B
For more information
www.analog.com
LTC2320-12
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
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
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l
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ELECTRICAL CHARACTERISTICS
CONDITIONS
(Note 5)
(Note 5)
V
IN
= V
IN+
– V
IN–
V
CM
= (V
IN+
– V
IN–
)/2
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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
CONVERTER CHARACTERISTICS
SYMBOL PARAMETER
Resolution
No Missing Codes
Transition Noise
INL
DNL
BZE
FSE
Integral Linearity Error
Differential Linearity Error
Bipolar Zero-Scale Error
Bipolar Zero-Scale Error Drift
Bipolar Full-Scale Error
Bipolar Full-Scale Error Drift
(Note 7)
(Note 6)
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
TYP
MAX
UNITS
Bits
Bits
12
12
0.2
–1
–0.99
–1.5
–3
±0.25
±0.4
0
0.005
0
15
1
0.99
1.5
3
LSB
RMS
LSB
LSB
LSB
LSB/°C
LSB
ppm/°C
l
l
l
V
REFOUT1,2,3,4
= 4.096V (REFBUFEN Grounded) (Note 7)
V
REFOUT1,2,3,4
= 4.096V (REFBUFEN Grounded)
l
DYNAMIC ACCURACY
SYMBOL PARAMETER
SINAD
SNR
THD
SFDR
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).
CONDITIONS
l
MIN
74
75
TYP
77
77
77
77.5
–90
–91
MAX
UNITS
dB
dB
dB
dB
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
Total Harmonic Distortion
Spurious Free Dynamic Range
–3dB Input Bandwidth
Aperture Delay
Aperture Delay Matching
Aperture Jitter
Transient Response
Full-Scale Step
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 4.096V, Internal Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 5V, External Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 4.096V, Internal Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 5V, External Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 4.096V, Internal Reference
f
IN
= 500kHz, V
REFOUT1,2,3,4
= 5V, External Reference
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–76
dB
dB
dB
dB
MHz
ps
ps
ps
RMS
ns
l
76
93
93
55
500
500
1
30
For more information
www.analog.com
3
Rev B
LTC2320-12
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
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)
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INTERNAL REFERENCE CHARACTERISTICS
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
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
CMOS Digital Inputs and Outputs
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
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
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l
l
l
l
l
DIGITAL INPUTS AND DIGITAL OUTPUTS
CONDITIONS
CMOS/LVDS
= GND
MIN
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
V
IN
= 0V to OV
DD
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l
l
l
l
l
l
LVDS Digital Inputs and Outputs
4
Rev B
For more information
www.analog.com
LTC2320-12
POWER REQUIREMENTS
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
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l
l
l
l
l
l
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
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
51
30
38
2.63
7
6.2
110
130
26.6
355
208
31.2
525
2.63
34
6.2
110
196
60
355
275
68.5
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
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C (Note 4).
SYMBOL
f
SMPL
t
CYC
t
CONV
t
CNVH
t
ACQUISITION
t
WAKE
t
SCK
t
SCKH
t
SCKL
t
HSDO_SDR
t
DSCKCLKOUT
PARAMETER
Maximum Sampling Frequency
Time Between Conversions
Conversion Time
CNV
High Time
Sampling Aperture
REFOUT1,2,3,4 Wake-Up Time
SCK Period
SCK High Time
SCK Low Time
SDO Data Remains Valid Delay from CLKOUT↓
SCK to CLKOUT Delay
C
L
= 5pF (Note 12)
(Note 12)
(Note 11) t
ACQUISITION
= t
CYC
– t
CONV
C
REFOUT1,2,3,4
= 10µF
CMOS/LVDS
= GND,
SDR/
DDR = GND
(Note 13)
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l
l
l
l
ADC TIMING CHARACTERISTICS
CONDITIONS
l
MIN
l
l
l
TYP
MAX
1.5
1000
450
UNITS
Msps
µs
ns
ns
ns
ms
ns
ns
ns
(Note 11) t
CYC
= t
CNVH
+ t
CONV
+ t
READOUT
0.667
30
215
50
9.1
4.1
4.1
0
2
CMOS I/O Mode, SDR
1.5
4.5
ns
ns
For more information
www.analog.com
5
Rev B
