12-/16-bit A/D converters with serial I/O and an internal
reference.
The 8-channel input multiplexer can be configured for
either single-ended or differential inputs and unipolar or
bipolar conversions (or combinations thereof). The ADCs
convert 0V to 2.5V unipolar inputs or ±1.25V bipolar
inputs. The ADCs typically draw only 750µA from a single
2.7V supply. The automatic nap and sleep modes benefit
power sensitive applications.
The LTC1867L’s DC performance is outstanding with a
±3LSB INL specification and 16-bit no missing codes
over temperature.
Housed in a compact, narrow 16-pin SSOP package, the
LTC1863L/LTC1867L can be used in space-sensitive as
well as low power applications.
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.
n
n
n
n
n
n
n
n
n
Sample Rate: 175ksps
16-Bit No Missing Codes and ±3LSB Max INL
8-Channel Multiplexer with:
n
Single Ended or Differential Inputs and
n
Unipolar or Bipolar Conversion Modes
SPI/MICROWIRE Serial I/O
2.7V Guaranteed Supply Voltage
Pin Compatible with LTC1863/LTC1867
True Differential Inputs
On-Chip or External Reference
Low Power: 750µA at 175ksps, 300µA at 50ksps
Sleep Mode
Automatic Nap Mode Between Conversions
16-Pin Narrow SSOP Package
APPLICATIONS
n
n
n
n
n
Industrial Process Control
High Speed Data Acquisition
Battery Operated Systems
Multiplexed Data Acquisition Systems
Imaging Systems
BLOCK DIAGRAM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
1
2
3
4
5
6
7
8
INTERNAL
1.25V REF
ANALOG
INPUT
MUX
LTC1863L/LTC1867L
Integral Nonlinearity vs Output Code
(LTC1867L)
16
15
14
V
DD
GND
SDI
SDO
SCK
CS/CONV
V
REF
2.0
1.5
1.0
INL (LSB)
V
DD
= 2.7V
f
SAMPLE
= 175ksps
+
–
12-/16-BIT
175ksps
ADC
SERIAL
PORT
13
12
11
10
0.5
0
–0.5
–1.0
–1.5
9
1863L7L BD
REFCOMP
–2.0
0
16384
32768
OUTPUT CODE
49152
65536
1863L7L G01
1863l7lfd
For more information
www.linear.com/LTC1863L
1
LTC1863L/LTC1867L
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7/COM 8
16 V
DD
15 GND
14 SDI
13 SDO
12 SCK
11
CS/CONV
10 V
REF
9
REFCOMP
Supply Voltage (V
DD
) ................................... –0.3V to 6V
Analog Input Voltage
CH0-CH7/COM (Note 3) ...........– 0.3V to (V
DD
+ 0.3V)
V
REF
, REFCOMP (Note 4) ......... –0.3V to (V
DD
+ 0.3V)
Digital Input Voltage (SDI, SCK,
CS/CONV)
(Note 4) ................................................. –0.3V to 10V
Digital Output Voltage (SDO) ....... –0.3V to (V
DD
+ 0.3V)
Power Dissipation .............................................. 500mW
Operating Temperature Range
LTC1863LC/LTC1867LC/LTC1867LAC ..... 0°C to 70°C
LTC1863LI/LTC1867LI/LTC1867LAI .....–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
T
JMAX
= 110°C,
θ
JA
= 95°C/W
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
ORDER INFORMATION
LEAD FREE FINISH
LTC1863LCGN#PBF
LTC1863LIGN#PBF
LTC1867LCGN#PBF
LTC1867LIGN#PBF
LTC1867LACGN#PBF
LTC1867LAIGN#PBF
TAPE AND REEL
LTC1863LCGN#TRPBF
LTC1863LIGN#TRPBF
LTC1867LCGN#TRPBF
LTC1867LIGN#TRPBF
LTC1867LACGN#TRPBF
LTC1867LAIGN#TRPBF
PART MARKING*
1863L
1863L
1867L
1867L
1867L
1867L
PACKAGE DESCRIPTION
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
TEMPERATURE RANGE
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
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard 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/
CONVERTER CHARACTERISTICS
PARAMETER
Resolution
No Missing Codes
Integral Linearity Error
Differential Linearity Error
Transition Noise
Offset Error
Offset Error Match
Offset Error Drift
Unipolar (Note 8)
Bipolar
Unipolar
Bipolar
Unipolar (Note 7)
Bipolar
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 2.7V, external V
REF
= 1.25V (Notes 5, 6)
LTC1863L
MIN
TYP
MAX
l
l
l
l
l
LTC1867L
MIN
TYP MAX
16
15
LTC1867LA
MIN
TYP
MAX
16
16
UNITS
Bits
Bits
12
12
±1
±1
±1
0.1
±3
±4
±1
±1
±0.5
±4
±4
–2
1.6
±32
±64
±4
±4
±0.5
±0.5
–1
1.6
±3
±3
LSB
LSB
LSB
LSB
RMS
l
l
±32
±64
±3
±3
LSB
LSB
LSB
LSB
ppm/°C
1863l7lfd
2
For more information
www.linear.com/LTC1863L
LTC1863L/LTC1867L
CONVERTER CHARACTERISTICS
PARAMETER
Gain Error
Gain Error Match
Gain Error Tempco
Power Supply Sensitivity
CONDITIONS
Unipolar
Bipolar
Unipolar
Bipolar
Internal Reference
External Reference
V
DD
= 2.7V – 3.6V
±20
±3
±1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 2.7V, external V
REF
= 1.25V (Notes 5, 6)
LTC1863L
MIN
TYP
MAX
±6
±6
±1
±1
±20
±3
±3
LTC1867L
MIN
TYP MAX
±96
±96
±4
±4
±20
±3
±3
LTC1867LA
MIN
TYP
MAX
±64
±64
±3
±3
UNITS
LSB
LSB
LSB
LSB
ppm/°C
ppm/°C
LSB
DYNAMIC ACCURACY
SYMBOL
SNR
S/(N+D)
THD
PARAMETER
Signal-to-Noise Ratio
V
DD
= 3V, external V
REF
= 1.25V (Note 5)
CONDITIONS
1kHz Input Signal
1kHz Input Signal
1kHz Input Signal, Up to 5th Harmonic
1kHz Input Signal
100kHz Input Signal
–3dB Point
LTC1863L
MIN
TYP
MAX
73.1
73
–91.8
–94.8
–100
1.25
LTC1867L/LTC1867LA
MIN
TYP MAX
83.7
83.1
– 92.3
– 95.1
–112
1.25
UNITS
dB
dB
dB
dB
dB
MHz
Signal-to-(Noise + Distortion) Ratio
Total Harmonic Distortion
Peak Harmonic or Spurious Noise
Channel-to-Channel Isolation
Full Power Bandwidth
ANALOG INPUT
SYMBOL
PARAMETER
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
Unipolar Mode (Note 9)
Bipolar Mode
Between Conversions (Sample Mode)
During Conversions (Hold Mode)
l
l
l
LTC1863L/LTC1867L/LTC1867LA
MIN
TYP
MAX
0 to 2.5
±1.25
32
4
2.01
1.68
±1
l
UNITS
V
V
pF
pF
µs
µA
Analog Input Range
C
IN
t
ACQ
Analog Input Capacitance for CH0 to
CH7/COM
Sample-and-Hold Acquisition Time
Input Leakage Current
On Channels, CHX = 0V or V
DD
INTERNAL REFERENCE CHARACTERISTICS
PARAMETER
V
REF
Output Voltage
V
REF
Output Tempco
V
REF
Line Regulation
V
REF
Output Resistance
REFCOMP Output Voltage
CONDITIONS
I
OUT
= 0
I
OUT
= 0
2.7V ≤ V
DD
≤ 3.6V
I
OUT
≤0.1mA
I
OUT
= 0
(Note 5)
LTC1863L/LTC1867L/LTC1867LA
MIN
TYP
MAX
1.235
1.25
±20
0.3
3
2.5
1.265
UNITS
V
ppm/°C
mV/V
kΩ
V
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
PARAMETER
High Level Input Voltage
Low Level Input Voltage
CONDITIONS
V
DD
= 3.6V
V
DD
= 2.7V
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1863L/LTC1867L/LTC1867LA
MIN
TYP
MAX
l
l
UNITS
V
V
1863l7lfd
1.9
0.45
For more information
www.linear.com/LTC1863L
3
LTC1863L/LTC1867L
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
I
IN
C
IN
V
OH
V
OL
I
SOURCE
I
SINK
PARAMETER
Digital Input Current
Digital Input Capacitance
High Level Output Voltage (SDO)
Low Level Output Voltage (SDO)
Output Source Current
Output Sink Current
Hi-Z Output Leakage
Hi-Z Output Capacitance
Data Format
V
DD
= 2.7V, I
O
= –10µA
V
DD
= 2.7V, I
O
= –200µA
V
DD
= 2.7V, I
O
= 160µA
V
DD
= 2.7V, I
O
= 1.6µA
SDO = 0V
SDO = V
DD
CS/CONV
= High, SDO = 0V or V
DD
CS/CONV
= High (Note 10)
Unipolar
Bipolar
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 5)
CONDITIONS
V
IN
= 0V to V
DD
l
LTC1863L/LTC1867L/LTC1867LA
MIN
TYP
MAX
±10
2
23
2.68
2.65
0.05
0.15
–9.7
6
±10
15
Straight Binary
Two’s Complement
0.4
UNITS
µA
pF
V
V
V
V
mA
mA
µA
pF
POWER REQUIREMENTS
SYMBOL
V
DD
I
DD
P
DISS
PARAMETER
Supply Voltage
Supply Current
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1863L/LTC1867L/LTC1867LA
CONDITIONS
(Note 9)
f
SAMPLE
= 175ksps, Internal REF
NAP Mode
SLEEP Mode
f
SAMPLE
= 175ksps
l
l
l
MIN
2.7
TYP
0.75
170
0.2
2
MAX
3.6
1
3
2.7
UNITS
V
mA
µA
µA
mW
Power Dissipation
TIMING CHARACTERISTICS
SYMBOL
f
SAMPLE
t
CONV
t
ACQ
f
SCK
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
PARAMETER
Maximum Sampling Frequency
Conversion Time
Acquisition Time
SCK Frequency
CS/CONV
High Time
SDO Valid After SCK↓
SDO Valid Hold Time After SCK↓
SDO Valid After
CS/CONV↓
SDI Setup Time Before SCK↑
SDI Hold Time After SCK↑
SLEEP Mode Wake-Up Time
Bus Relinquish Time After
CS/CONV↑
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1863L/LTC1867L/LTC1867LA
CONDITIONS
l
l
l
MIN
175
TYP
3.2
MAX
3.7
20
UNITS
kHz
µs
µs
MHz
ns
ns
ns
ns
ns
ns
ms
2.01
40
5
15
15
1.68
100
22
17
20
–6
6
80
30
50
40
47
Short
CS/CONV
Pulse Mode
C
L
= 25pF (Note 11)
C
L
= 25pF
C
L
= 25pF
l
l
l
l
l
l
C
REFCOMP
= 10µF, C
VREF
= 2.2µF
C
L
= 25pF
l
ns
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 GND (unless otherwise
noted).
Note 3:
When these pin voltages are taken below GND or above V
DD
, they
will be clamped by internal diodes. This product can handle input currents
up to 100mA without latchup.
4
1863l7lfd
For more information
www.linear.com/LTC1863L
LTC1863L/LTC1867L
TIMING CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
measured from –1/2LSB when output code flickers between 0000 0000
0000 0000 and 1111 1111 1111 1111 for LTC1867L, and between
0000 0000 0000 and 1111 1111 1111 for LTC1863L.
Note 9:
Recommended operating conditions. The input range of ±1.25V
for bipolar mode is measured with respect to V
IN–
= 1.25V. For unipolar
mode, common mode input range is 0V to V
DD
for the positive input and
0V to 1.5V for the negative input. For bipolar mode, common mode input
range is 0V to V
DD
for both positive and negative inputs.
Note 10:
Guaranteed by design, not subject to test.
Note 11:
t
2
of 47ns maximum allows f
SCK
up to 10MHz for rising capture
with 50% duty cycle and f
SCK
up to 20MHz for falling capture (with 3ns
setup time for the receiving logic).
Note 4:
When these pin voltages are taken below GND, they will be
clamped by internal diodes. This product can handle input currents up to
100mA below GND without latchup. These pins are not clamped to V
DD
.
Note 5:
V
DD
= 2.7V, f
SAMPLE
= 175ksps and f
SCK
= 20MHz at 25°C,
t
r
= t
f
= 5ns and V
IN–
= 1.25V for bipolar mode unless otherwise specified.
Note 6:
Linearity, offset and gain error specifications apply for both
unipolar and bipolar modes. The INL and DNL are tested in bipolar mode.
Note 7:
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 8:
Unipolar offset is the offset voltage measured from +1/2LSB
when the output code flickers between 0000 0000 0000 0000 and
0000 0000 0000 0001 for LTC1867L and between 0000 0000 0000
and 0000 0000 0001 for LTC1863L. Bipolar offset is the offset voltage
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