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LTC1861LCMS#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1860L/LTC1861L
18601Lf
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
µPower, 3V, 12-Bit, 150ksps
1- and 2-Channel ADCs in MSOP
Single 3V Supply, 150ksps, 12-Bit Sampling ADC
Supply Current vs Sampling Frequency
The LTC
®
1860L/LTC1861L are 12-bit A/D converters that
are offered in MSOP and SO-8 packages and operate on a
single 3V supply. At 150ksps, the supply current is only
450µA. The supply current drops at lower speeds because
the LTC1860L/LTC1861L automatically power down be-
tween conversions. These 12-bit switched capacitor suc-
cessive approximation ADCs include sample-and-holds.
The LTC1860L has a differential analog input with an
external reference pin. The LTC1861L offers a software-
selectable 2-channel MUX and an external reference pin on
the MSOP version.
The 3-wire, serial I/O, 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.
■
12-Bit 150ksps ADCs in MSOP Package
■
Single 3V Supply
■
Low Supply Current: 450µA (Typ)
■
Auto Shutdown Reduces Supply Current
to 10µA at 1ksps
■
True Differential Inputs
■
1-Channel (LTC1860L) or 2-Channel (LTC1861L)
Versions
■
SPI/MICROWIRE
TM
Compatible Serial I/O
■
High Speed Upgrade to LTC1285/LTC1288
■
Pin Compatible with 16-Bit LTC1864L/LTC1865L
■
No Minimum Data Transfer Rate
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
High Speed Data Acquisition
■
Portable or Compact Instrumentation
■
Low Power Battery-Operated Instrumentation
■
Isolated and/or Remote Data Acquisition
MICROWIRE is a trademark of National Semiconductor Corporation.
1
2
3
4
8
7
6
5
V
REF
IN
+
IN
–
GND
V
CC
SCK
SDO
CONV
LTC1860L
1860L TA01
ANALOG INPUT
0V TO 3V
3V
1µF
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
SAMPLING FREQUENCY (kHz)
0.1
SUPPLY CURRENT (µA)
1
10
100
1000
0.01 1 10 1000
1860L/61L TA02
0.1 100
CONV LOW = 1.5µs
T
A
= 25°C
V
CC
= 2.7V
2
LTC1860L/LTC1861L
18601Lf
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution ● 12 Bits
No Missing Codes Resolution ● 12 Bits
INL (Note 3) ● ±1 LSB
Transition Noise 0.13 LSB
RMS
Gain Error ● ±20 mV
Offset Error ● ±2 ±5mV
Input Differential Voltage Range V
IN
= IN
+
– IN
–
● 0V
REF
V
Absolute Input Range IN
+
Input –0.05 V
CC
+ 0.05 V
IN
–
Input –0.05 V
CC
/2 V
V
REF
Input Range LTC1860L S0-8 and MSOP, LTC1861L MSOP 1 V
CC
V
Analog Input Leakage Current (Note 4) ● ±1 µA
C
IN
Input Capacitance In Sample Mode 12 pF
During Conversion 5 pF
Power Dissipation.............................................. 400mW
Operating Temperature Range
LTC1860LC/LTC1861LC......................... 0°C to 70°C
LTC1860LI/LTC1861LI ...................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Supply Voltage (V
CC
) ................................................. 7V
Ground Voltage Difference
AGND, DGND LTC1861L 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)
(Notes 1, 2)
ORDER PART
NUMBER
MS8 PART MARKING
ORDER PART
NUMBER
LTC1860LCMS8
LTC1860LIMS8
LTD2
LTD3
MS PART MARKING
T
JMAX
= 150°C, θ
JA
= 210°C/W
T
JMAX
= 150°C, θ
JA
= 175°C/W
1
2
3
4
V
REF
IN
+
IN¯
GND
8
7
6
5
V
CC
SCK
SDO
CONV
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
LTC1861LCMS
LTC1861LIMS
LTD4
LTD5
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
CC
= 2.7V, V
REF
= 2.5V, f
SCK
= f
SCK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
CO VERTER A D ULTIPLEXER CHARACTERISTICS
U
WU
ORDER PART
NUMBER
S8 PART MARKING
LTC1860LCS8
LTC1860LIS8
1860L
1860LI
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
V
REF
IN
+
IN
–
GND
V
CC
SCK
SDO
CONV
ORDER PART
NUMBER
S8 PART MARKING
LTC1861LCS8
LTC1861LIS8
1861L
1861LI
T
JMAX
= 150°C, θ
JA
= 210°C/W
T
JMAX
= 150°C, θ
JA
= 175°C/W
1
2
3
4
5
CONV
CH0
CH1
AGND
DGND
10
9
8
7
6
V
REF
V
CC
SCK
SDO
SDI
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
CONV
CH0
CH1
GND
V
CC
SCK
SDO
SDI
3
LTC1860L/LTC1861L
18601Lf
The ● denotes specifications which apply
over the full operating temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 2.7V, V
REF
= 2.5V, unless otherwise noted.
T
A
= 25°C. V
CC
= 3V, V
REF
= 3V, f
SAMPLE
= 150kHz, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SNR Signal-to-Noise Ratio 72 dB
S/(N + D) Signal-to-Noise Plus Distortion Ratio 1kHz Input Signal 72 dB
THD Total Hamonic Distortion Up to 5th Harmonic 1kHz Input Signal 86 dB
Full Power Bandwidth 10 MHz
Full Linear Bandwidth S/(N + D) ≥ 68dB 30 kHz
DY A IC ACCURACY
UW
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
U
The ● denotes specifications which apply over the
full operating temperature range, otherwise specifications are T
A
= 25°C.
RECO E DED OPERATI G CO DITIO S
UUUUWW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
CC
= 3.3V ● 1.9 V
V
IL
Low Level Input Voltage V
CC
= 2.7V ● 0.45 V
I
IH
High Level Input Current V
IN
= V
CC
● 2.5 µA
I
IL
Low Level Input Current V
IN
= 0V ● –2.5 µA
V
OH
High Level Output Voltage V
CC
= 2.7V, I
O
= 10µA ● 2.3 2.6 V
V
CC
= 2.7V, I
O
= 360µA ● 2.1 2.45 V
V
OL
Low Level Output Voltage V
CC
= 2.7V, I
O
= 400µA ● 0.3 V
I
OZ
Hi-Z Output Leakage CONV = V
CC
● ±3 µA
I
SOURCE
Output Source Current V
OUT
= 0V –6.5 mA
I
SINK
Output Sink Current V
OUT
= V
CC
6.5 mA
I
REF
Reference Current (LTC1860L SO-8, MSOP CONV = V
CC
● 0.001 3 µA
and LTC1861L MSOP) f
SMPL
= f
SMPL(MAX)
● 0.01 0.1 mA
I
CC
Supply Current CONV = V
CC
After Conversion ● 0.5 10 µA
f
SMPL
= f
SMPL(MAX)
● 0.45 1.0 mA
P
D
Power Dissipation f
SMPL
= f
SMPL(MAX)
1.22 mW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage 2.7 3.6 V
f
SCK
Clock Frequency ● DC 8 MHz
t
CYC
Total Cycle Time 12 • SCK + t
CONV
µs
t
SMPL
Analog Input Sampling Time (Note 5) LTC1860L 12 SCK
LTC1861L 10 SCK
t
suCONV
Setup Time CONV↓ Before First SCK↑, 60 ns
(See Figure 1)
t
hDI
Holdtime SDI After SCK↑ LTC1861L 30 ns
t
suDI
Setup Time SDI Stable Before SCK↑ LTC1861L 30 ns
t
WHCLK
SCK High Time f
SCK
= f
SCK(MAX)
45% 1/f
SCK
t
WLCLK
SCK Low Time f
SCK
= f
SCK(MAX)
45% 1/f
SCK
t
WHCONV
CONV High Time Between Data t
CONV
µs
Transfer Cycles
t
WLCONV
CONV Low Time During Data Transfer 12 SCK
t
hCONV
Hold Time CONV Low After Last SCK↑ 26 ns
P1-P3P4-P6P7-P9P10-P12

LTC1861LCMS#PBF

Mfr. #:
Buy LTC1861LCMS#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Analog to Digital Converters - ADC 12-bit, 3V, 2-ch. 150ksps ADC
Lifecycle:
New from this manufacturer.
Delivery:
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