LTC2315-12
12-Bit, 5Msps Serial
Sampling ADC in TSOT
FEATURES
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DESCRIPTION
The
LTC
®
2315-12
is a 12-bit, 5Msps, serial sampling A/D
converter that draws only 6.4mA from a wide range analog
supply adjustable from 2.7V to 5.25V. The LTC2315-12
contains an integrated bandgap and reference buffer which
provide a low cost, high performance (20ppm/°C max)
and space saving applications solution. The LTC2315-12
achieves outstanding AC performance of 72.6dB SINAD
and –84dB THD while sampling a 500kHz input frequency.
The extremely high sample rate-to-power ratio makes the
LTC2315-12 ideal for compact, low power, high speed
systems. The LTC2315-12 also provides both nap and
sleep modes for further optimization of the device power
within a system.
The LTC2315-12 has a high-speed SPI-compatible serial
interface that supports 1.8V, 2.5V, 3V and 5V logic. The
fast 5Msps throughput makes the LTC2315-12 ideally
suited for a wide variety of high speed applications.
Complete 14-/12-Bit Pin-Compatible SAR ADC Family
500ksps
14-Bit
12-Bit
2.5Msps
4.5Msps
5Msps
LTC2315-12
LTC2312-14 LTC2313-14 LTC2314-14
LTC2312-12 LTC2313-12
5Msps Throughput Rate
Guaranteed 12-Bit No Missing Codes
Internal Reference: 2.048V/4.096V Span
Low Noise: 73dB SNR
Low Power: 6.4mA at 5Msps and 5V
Dual Supply Range: 3V/5V operation
Sleep Mode with < 1µA Typical Supply Current
Nap Mode with Quick Wake-up < 1 conversion
Separate 1.8V to 5V Digital I/O Supply
High Speed SPI-Compatible Serial I/O
Guaranteed Operation from –40°C to 125°C
8-Lead TSOT-23 Package
APPLICATIONS
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Communication Systems
High Speed Data Acquisition
Handheld Terminal Interface
Medical Imaging
Uninterrupted Power Supplies
Battery Operated Systems
Automotive
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Power 3V/5V 9mW/15mW 14mW/25mW 18mW/31mW 19mW/32mW
TYPICAL APPLICATION
5V Supply, Internal Reference, 5Msps, 12-bit Sampling ADC
5V
2.2µF
2.2µF
REF
GND
ANALOG INPUT
0V TO 4.096V
A
IN
SCK
SDO
OV
DD
2.2µF
LTC2315-12
V
DD
CS
AMPLITUDE (dBFS)
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
–20
–40
–60
–80
–100
–120
231512 TA01
16k Point FFT, f
S
= 5Msps, f
IN
= 500kHz
0
V
DD
= 5V
SNR = 73.1dBFS
SINAD = 72.6dBFS
THD = –84dB
SFDR = 87dBc
DIGITAL OUTPUT SUPPLY
1.8V TO 5V
–140
0
500
2000
1500
FREQUENCY (kHz)
1000
2500
231512 TA01a
231512fa
For more information
www.linear.com/LTC2315-12
1
LTC2315-12
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
V
DD
REF
GND
A
IN
1
2
3
4
8
7
6
5
CS
SCK
SDO
OV
DD
Supply Voltage (V
DD
, OV
DD
) .......................................6V
Reference (REF) and Analog Input (A
IN
) Voltage
(Note 3) ......................................(–0.3V) to (V
DD
+ 0.3V)
Digital Input Voltage (Note 3) .. (–0.3V) to (OV
DD
+ 0.3V)
Digital Output Voltage ............. (–0.3V) to (OV
DD
+ 0.3V)
Power Dissipation ...............................................100mW
Operating Temperature Range
LTC2315C ................................................ 0°C to 70°C
LTC2315I..............................................–40°C to 85°C
LTC2315H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature Range (Soldering, 10 sec)........ 300°C
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 195°C/W
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI)
LTC2315CTS8-12#TRMPBF
LTC2315ITS8-12#TRMPBF
TAPE AND REEL
LTC2315CTS8-12#TRPBF
LTC2315ITS8-12#TRPBF
PART MARKING*
LTFZG
LTFZG
PACKAGE DESCRIPTION
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
TEMPERATURE RANGE
0°C to 70°C
–40˚C to 85˚C
–40˚C to 125˚C
LTC2315HTS8-12#TRMPBF
LTC2315HTS8-12#TRPBF
LTFZG
8-Lead Plastic TSOT-23
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on 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/
231512fa
2
For more information
www.linear.com/LTC2315-12
LTC2315-12
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
SYMBOL PARAMETER
V
AIN
V
IN
I
IN
C
IN
Absolute Input Range
Input Voltage Range
Analog Input DC Leakage Current
Analog Input Capacitance
Sample Mode
Hold Mode
(Note 11)
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ELECTRICAL CHARACTERISTICS
CONDITIONS
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MIN
–0.05
0
–1
TYP
MAX
V
DD
+ 0.05
V
REF
1
UNITS
V
V
µA
pF
pF
13
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CONVERTER CHARACTERISTICS
SYMBOL PARAMETER
Resolution
No Missing Codes
Transition Noise
INL
DNL
Integral Linearity Error
Differential Linearity Error
Offset Error
Full-Scale Error
Total Unadjusted Error
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
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MIN
12
12
TYP
MAX
UNITS
Bits
Bits
(Note 6)
V
DD
= 5V (Note 5)
V
DD
= 3V (Note 5)
V
DD
= 5V
V
DD
= 3V
V
DD
= 5V
V
DD
= 3V
V
DD
= 5V
V
DD
= 3V
V
DD
= 5V
V
DD
= 3V
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l
0.33
–1.25
–1.5
–0.99
–0.99
–4
–6
–7
–9
–8
–10
±0.25
±0.3
±0.15
±0.2
±0.5
±1
±1.5
±2
±2
±2.5
1.25
1.5
0.99
0.99
4
6
7
9
8
10
LSB
RMS
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
DYNAMIC ACCURACY
SYMBOL PARAMETER
SINAD
SNR
THD
SFDR
IMD
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. (Note 4)
CONDITIONS
f
IN
= 500kHz, V
DD
= 5V
f
IN
= 500kHz, V
DD
= 3V
f
IN
= 500kHz, V
DD
= 5V
f
IN
= 500kHz, V
DD
= 3V
f
IN
= 500kHz, V
DD
= 5V
f
IN
= 500kHz, V
DD
= 3V
f
IN
= 500kHz, V
DD
= 5V
f
IN
= 500kHz, V
DD
= 3V
f
IN1
= 461kHz, f
IN2
= 541kHz
A
IN1
, A
IN2
= –7dBFS
At 3dB
At 0.1dB
SINAD ≥ 68dB
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MIN
69.5
67.5
70
68
TYP
72.6
69.5
73
70
–84
–84
87
87
–77
–89
130
20
5
1
10
MAX
UNITS
dB
dB
dB
dB
Signal-to-(Noise + Distortion) Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
First 5 Harmonics
Spurious Free Dynamic Range
Intermodulation Distortion
2nd Order Terms
3rd Order Terms
Full Power Bandwidth
–3dB Input Linear Bandwidth
–76
–75
78
77
dB
dB
dB
dB
dBc
dBc
MHz
MHz
MHz
ns
ps
RMS
t
AP
t
JITTER
Aperture Delay
Aperture Jitter
231512fa
For more information
www.linear.com/LTC2315-12
3
LTC2315-12
REFERENCE INPUT/OUTPUT
SYMBOL PARAMETER
V
REF
V
REF
Output Voltage
V
REF
Temperature Coefficient
V
REF
Output Resistance
V
REF
Line Regulation
V
REF
2.048V/4.096V Supply Threshold
V
REF
2.048V/4.096V Supply Threshold Hysteresis
V
REF
Input Voltage Range
(External Reference Input)
2.7V ≤ V
DD
≤ 3.6V
4.75 ≤ V
DD
≤ 5.25V
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The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
2.7V ≤ V
DD
≤ 3.6V
4.75 ≤ V
DD
≤ 5.25V
Normal Operation
Overdrive Condition
(V
REFIN
≥ V
REFOUT
+ 50mV)
2.7V ≤ V
DD
≤ 3.6V
4.75 ≤ V
DD
≤ 5.25V
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MIN
2.040
4.080
TYP
2.048
4.096
7
2
52
2
0.8
4.15
150
MAX
2.056
4.112
20
UNITS
V
V
ppm/°C
Ω
kΩ
mV/V
mV/V
V
mV
V
REF
+ 50mV
V
REF
+ 50mV
V
DD
4.3
V
V
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
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
OZ
C
OZ
I
SOURCE
I
SINK
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
High-Z Output Leakage Current
High-Z Output Capacitance
Output Source Current
Output Sink Current
I
O
= –500µA (Source)
I
O
= 500µA (Sink)
V
OUT
= 0V to OV
DD
,
CS
= High
CS
= High
V
OUT
= 0V, OV
DD
= 1.8V
V
OUT
= OV
DD
= 1.8V
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DIGITAL INPUTS AND DIGITAL OUTPUTS
CONDITIONS
MIN
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TYP
MAX
0.2 • OV
DD
UNITS
V
V
μA
pF
V
0.8 • OV
DD
–10
5
OV
DD
–0.2
0.2
–10
4
–20
20
10
10
V
IN
= 0V to OV
DD
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V
µA
pF
mA
mA
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
OV
DD
PARAMETER
Supply Voltage
3V Operational Range
5V Operational Range
Digital Output Supply Voltage
CS
= 0V, SCK = 0V
CONDITIONS
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POWER REQUIREMENTS
MIN
2.7
4.75
1.71
TYP
3
5
3.5
6.4
1.8
0.8
17.5
32
9
4
MAX
3.6
5.25
5.25
4
7.5
5
20
37.5
25
UNITS
V
V
V
mA
mA
mA
µA
mW
mW
mW
µW
Supply Current, Static Mode
I
TOTAL
=
IV
DD +
IOV
DD
Operational Mode
Nap Mode
Sleep Mode
P
D
Power Dissipation, Static Mode
Operational Mode
Nap Mode
Sleep Mode
CS
= 0V, SCK = 0V
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231512fa
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For more information
www.linear.com/LTC2315-12
LTC2315-12
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
SYMBOL
f
SCK
t
SCK
t
CONV
t
ACQ
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
WAKE
_
NAP
t
WAKE
_
SLEEP
PARAMETER
Shift Clock Frequency
Shift Clock Period
Conversion Time
Acquisition Time
Minimum
CS
Pulse Width
SCK Setup Time After
CS↓
SDO Enable Time After
CS↓
SDO Data Valid Access Time after SCK↓
SCLK Low Time
SCLK High Time
SDO Data Valid Hold Time After SCK↓
SDO into Hi-Z State Time After 16th SCK↓
SDO into Hi-Z State Time After
CS↑
CS↑
Setup Time After 14th SCK↓
Latency
Power-Up Time from Nap Mode
Power-Up Time from Sleep Mode
See Nap Mode Section
See Sleep Mode Section
(Notes 7, 8, 9)
(Notes 7, 8, 10)
(Notes 7, 8, 10)
(Note 7)
↔
(Note 7)
(Note 7)
(Notes 7, 8)
(Notes 7, 8, 9)
CONDITIONS
(Notes 7, 8)
(Notes 7, 8)
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ADC TIMING CHARACTERISTICS
f
SAMPLE(MAX)
Maximum Sampling Frequency
MIN
TYP
MAX
5
87.5
UNITS
MHz
MHz
ns
ns
ns
ns
ns
ns
11.4
200
160
40
5
5
10
9.1
4.5
4.5
1
3
3
5
1 Cycle Latency
50
1.1
10
10
t
THROUGHPUT
Minimum Throughput Time, t
ACQ
+ t
CONV
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
Note 1.
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2.
All voltage values are with respect to ground.
Note 3.
When these pin voltages are taken below ground or above V
DD
(A
IN
, REF) or OV
DD
(SCK,
CS,
SDO) they will be clamped by internal
diodes. This product can handle input currents up to 100mA below ground
or above V
DD
or OV
DD
without latch-up.
Note 4.
V
DD
= 5V, OV
DD
= 2.5V, f
SMPL
= 5MHz, f
SCK
= 87.5MHz, A
IN
=
–1dBFS and internal reference unless otherwise noted.
Note 5.
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 6.
Typical RMS noise at code transitions.
Note 7.
Parameter tested and guaranteed at OV
DD
= 2.5V. All input signals
are specified with t
r
= t
f
= 1nS (10% to 90% of OV
DD
) and timed from a
voltage level of OV
DD
/2.
Note 8.
All timing specifications given are with a 10pF capacitance load.
Load capacitances greater than this will require a digital buffer.
Note 9.
The time required for the output to cross the V
IH
or V
IL
voltage.
Note 10.
Guaranteed by design, not subject to test.
Note 11.
Recommended operating conditions.
231512fa
For more information
www.linear.com/LTC2315-12
5
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