FEATURES
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LTC1864/LTC1865
µPower, 16-Bit, 250ksps
1- and 2-Channel
ADCs in MSOP
DESCRIPTION
The LTC
®
1864/LTC1865 are 16-bit A/D converters that
are offered in MSOP and SO-8 packages and operate
on a single 5V supply. At 250ksps, the supply current is
only 850μA. The supply current drops at lower speeds
because the LTC1864/LTC1865 automatically power down
between conversions. These 16-bit switched capacitor
successive approximation ADCs include sample-and-
holds. The LTC1864 has a differential analog input with an
adjustable reference pin. The LTC1865 offers a software-
selectable 2-channel MUX and an adjustable reference pin
on the MSOP version.
The 3-wire, serial I/O, small MSOP or SO-8 package and
extremely high sample rate-to-power ratio make these
ADCs ideal choices for compact, low power, high speed
systems.
These ADCs can be used in ratiometric applications or with
external references. The high impedance analog inputs
and the ability to operate with reduced spans down to
1V full scale, allow direct connection to signal sources
in many applications, eliminating the need for external
gain stages.
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16-Bit 250ksps ADCs in MSOP Package
Single 5V Supply
Low Supply Current: 850μA (Typ)
Auto Shutdown Reduces Supply Current
to 2μA at 1ksps
True Differential Inputs
1-Channel (LTC1864) or 2-Channel (LTC1865)
Versions
SPI/MICROWIRE™ Compatible Serial I/O
16-Bit Upgrade to 12-Bit LTC1286/LTC1298
Pin Compatible with 12-Bit LTC1860/LTC1861
Guaranteed Operation to +125°C (MSOP Package)
APPLICATIONS
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High Speed Data Acquisition
Portable or Compact Instrumentation
Low Power Battery-Operated Instrumentation
Isolated and/or Remote Data Acquisition
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Single 5V Supply, 250ksps, 16-Bit Sampling ADC
1μF
5V
SUPPLY CURRENT (μA)
100
Supply Current vs Sampling Frequency
1000
LTC1864
1
2
ANALOG INPUT
0V TO 5V
3
4
V
REF
IN
+
IN
–
GND
V
CC
SCK
SDO
CONV
8
7
6
5
18645 TA01
10
1
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
0.1
0.01
0.01
0.1
10
100
1
SAMPLING FREQUENCY (kHz)
1000
18645 TA02
18645fb
1
LTC1864/LTC1865
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (V
CC
) .................................................7V
Ground Voltage Difference
AGND, DGND LTC1865 MSOP Package ............ ±0.3V
Analog Input ................ (GND – 0.3V) to (V
CC
+ 0.3V)
Digital Input ................................ (GND – 0.3V) to 7V
Digital Output .............. (GND – 0.3V) to (V
CC
+ 0.3V)
Power Dissipation .............................................. 400mW
Operating Temperature Range
LTC1864C/LTC1865C/
LTC1864AC/LTC1865AC...........................0°C to 70°C
LTC1864I/LTC1865I/
LTC1864AI/LTC1865AI ...................... – 40°C to 85°C
LTC1864H/LTC1865H
LTC1864AH/LTC1865AH ................. – 40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) ..................300°C
PIN CONFIGURATION
LTC1864
V
REF
IN
+
IN¯
GND
1
2
3
4
TOP VIEW
8
7
6
5
V
CC
SCK
SDO
CONV
LTC1865
CONV
CH0
CH1
AGND
DGND
1
2
3
4
5
TOP VIEW
10
9
8
7
6
V
REF
V
CC
SCK
SDO
SDI
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 210°C/W
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 210°C/W
LTC1864
V
REF
1
IN
+
2
IN
–
3
GND 4
TOP VIEW
8 V
CC
7 SCK
6 SDO
5 CONV
LTC1865
CONV 1
CH0 2
CH1 3
GND 4
TOP VIEW
8 V
CC
7 SCK
6 SDO
5 SDI
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 175°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 175°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC1864CMS8#PBF
LTC1864IMS8#PBF
LTC1864HMS8#PBF
LTC1864ACMS8#PBF
LTC1864AIMS8#PBF
LTC1864AHMS8#PBF
LTC1864CS8#PBF
LTC1864IS8#PBF
LTC1864ACS8#PBF
LTC1684AIS8#PBF
LTC1865CMS#PBF
LTC1865IMS#PBF
TAPE AND REEL
LTC1864CMS8#TRPBF
LTC1864IMS8#TRPBF
LTC1864HMS8#TRPBF
LTC1864ACMS8#TRPBF
LTC1864AIMS8#TRPBF
LTC1864AHMS8#TRPBF
LTC1864CS8#TRPBF
LTC1864IS8#TRPBF
LTC1864ACS8#TRPBF
LTC1684AIS8#TRPBF
LTC1865CMS#TRPBF
LTC1865IMS#TRPBF
PART MARKING
LTHQ
LTHQ
LTHQ
LTHQ
LTHQ
LTHQ
1864
1864I
1864A
1864AI
LTHS
LTHS
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
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LTC1864/LTC1865
ORDER INFORMATION
LEAD FREE FINISH
LTC1865HMS#PBF
LTC1865ACMS#PBF
LTC1865AIMS#PBF
LTC1865AHMS#PBF
LTC1865CS8#PBF
LTC1865IS8#PBF
LTC1865ACS8#PBF
LTC1865AIS8#PBF
LEAD BASED FINISH
LTC1864CMS8
LTC1864IMS8
LTC1864HMS8
LTC1864ACMS8
LTC1864AIMS8
LTC1864AHMS8
LTC1864CS8
LTC1864IS8
LTC1864ACS8
LTC1684AIS8
LTC1865CMS
LTC1865IMS
LTC1865HMS
LTC1865ACMS
LTC1865AIMS
LTC1865AHMS
LTC1865CS8
LTC1865IS8
LTC1865ACS8
LTC1865AIS8
TAPE AND REEL
LTC1865HMS#TRPBF
LTC1865ACMS#TRPBF
LTC1865AIMS#TRPBF
LTC1865AHMS#TRPBF
LTC1865CS8#TRPBF
LTC1865IS8#TRPBF
LTC1865ACS8#TRPBF
LTC1865AIS8#TRPBF
TAPE AND REEL
LTC1864CMS8#TR
LTC1864IMS8#TR
LTC1864HMS8#TR
LTC1864ACMS8#TR
LTC1864AIMS8#TR
LTC1864AHMS8#TR
LTC1864CS8#TR
LTC1864IS8#TR
LTC1864ACS8#TR
LTC1684AIS8#TR
LTC1865CMS#TR
LTC1865IMS#TR
LTC1865HMS#TR
LTC1865ACMS#TR
LTC1865AIMS#TR
LTC1865AHMS#TR
LTC1865CS8#TR
LTC1865IS8#TR
LTC1865ACS8#TR
LTC1865AIS8#TR
PART MARKING
LTHS
LTHS
LTHS
LTHS
1865
1865I
1865A
1865AI
PART MARKING
LTHQ
LTHQ
LTHQ
LTHQ
LTHQ
LTHQ
1864
1864I
1864A
1864AI
LTHS
LTHS
LTHS
LTHS
LTHS
LTHS
1865
1865I
1865A
1865AI
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
TEMPERATURE RANGE
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
18645fb
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LTC1864/LTC1865
CONVERTER AND MULTIPILEXER CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= 5V, V
REF
= 5V, f
SCK
= f
SCK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
LTC1864/LTC1865
PARAMETER
Resolution
No Missing Codes Resolution
INL
Transition Noise
Gain Error
Offset Error
LTC1864 SO-8 and MSOP LTC1865 MSOP
,
LTC1865 SO-8
IN
+
Input
IN
–
Input
LTC1864 SO-8 and MSOP
,
LTC1865 MSOP
(Note 4)
In Sample Mode
During Conversion
l
l
l
l
l
LTC1864A/LTC1865A
MIN
16
15
TYP
MAX
UNITS
Bits
Bits
±6
±6.5
1.1
±20
±2
±3
0
–0.05
–0.05
1
±5
±7
V
REF
V
CC
+ 0.05
V
CC
/2
V
CC
±1
12
5
LSB
LSB
LSB
RMS
mV
mV
mV
V
V
V
V
μA
pF
pF
CONDITIONS
l
l
l
l
MIN
16
14
TYP
MAX
(Note 3)
H-Grade (Note 3)
±8
±8.5
1.1
±20
±2
±3
0
–0.05
–0.05
1
±5
±7
V
REF
V
CC
+ 0.05
V
CC
/2
V
CC
±1
12
5
Input Differential Voltage Range V
IN
= IN
+
– IN
–
Absolute Input Range
V
REF
Input Range
Analog Input Leakage Current
C
IN
Input Capacitance
DYNAMIC ACCURACY
T
A
= 25°C. V
CC
= 5V, V
REF
= 5V, f
SAMPLE
= 250kHz, unless otherwise noted.
LTC1864/LTC1865
SYMBOL
SNR
S/(N + D)
THD
PARAMETER
Signal-to-Noise Ratio
Signal-to-Noise Plus Distortion Ratio
Total Harmonic Distortion Up to 5th Harmonic
Full Power Bandwidth
Full Linear Bandwidth
S/(N+D) ≥ 75dB
10kHz Input Signal
100kHz Input Signal
10kHz Input Signal
100kHz Input Signal
CONDITIONS
MIN
TYP
87
83
76
88
77
20
125
MAX
UNITS
dB
dB
dB
dB
dB
MHz
kHz
18645fb
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LTC1864/LTC1865
DIGITAL AND DC ELECTRICAL CHARACTERISTICS
SYMBOL
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
I
OZ
I
SOURCE
I
SINK
I
REF
I
CC
PARAMETER
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage
Output Source Current
Output Sink Current
Reference Current (LTC1864 SO-8 and MSOP
,
LTC1865 MSOP)
Supply Current
CONDITIONS
V
CC
= 5.25V
V
CC
= 4.75V
V
IN
= V
CC
V
IN
= 0V
V
CC
= 4.75V, I
O
= 10μA
V
CC
= 4.75V, I
O
= 360μA
V
CC
= 4.75V, I
O
= 1.6mA
CONV = V
CC
V
OUT
= 0V
V
OUT
= V
CC
CONV = VCC
f
SMPL
= f
SMPL(MAX)
CONV = V
CC
After Conversion
CONV = V
CC
After Conversion, H-Grade
f
SMPL
= f
SMPL(MAX)
f
SMPL
= f
SMPL(MAX)
●
●
●
●
●
l
l
l
l
l
l
●
●
The
●
denotes specifications which apply
over the full operating temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 5V, V
REF
= 5V, unless otherwise noted.
LTC1864/LTC1865
MIN
2.4
0.8
2.5
–2.5
4.5
2.4
4.74
4.72
0.4
±3
–25
20
0.001
0.05
0.001
0.001
0.85
4.25
3
0.1
3
5
1.3
TYP
MAX
UNITS
V
V
μA
μA
V
V
V
μA
mA
mA
μA
mA
μA
μA
mA
mW
P
D
Power Dissipation
18645fb
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嵌入式系统
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