FEATURES
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LTC2630
Single 12-/10-/8-Bit Rail-to-
Rail DACs with Integrated
Reference in SC70
DESCRIPTION
The LTC
®
2630 is a family of 12-, 10-, and 8-bit voltage-
output DACs with an integrated, high-accuracy, low-drift
reference in a 6-lead SC70 package. It has a rail-to-rail
output buffer and is guaranteed monotonic.
The LTC2630-L has a full-scale output of 2.5V, and
operates from a single 2.7V to 5.5V supply. The
LTC2630-H has a full-scale output of 4.096V, and operates
from a 4.5V to 5.5V supply. Each DAC can also operate in
supply as reference mode, which sets the full-scale output
to the supply voltage.
The parts use a simple SPI/MICROWIRE™ compatible
3-wire serial interface which operates at clock rates up
to 50MHz.
The LTC2630 incorporates a power-on reset circuit. Op-
tions are available for reset to zero or reset to midscale
after power-up.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5396245, 5859606, 6891433 and 6937178.
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Integrated Precision Reference
2.5V Full Scale 10ppm/°C (LTC2630-L)
4.096V Full Scale 10ppm/°C (LTC2630-H)
Maximum INL Error: 1 LSB (LTC2630A-12)
Low Noise: 0.7mV
P-P
, 0.1Hz to 200kHz
Guaranteed Monotonic over Temperature
Selectable Internal Reference or Supply as Reference
2.7V to 5.5V Supply Range (LTC2630-L)
Low Power Operation: 180µA at 3V
Power Down to 1.5µA Maximum (C and I Grades)
Power-on Reset to Zero or Midscale Options
SPI Serial Interface
Double-Buffered Data Latches
Tiny 6-Lead SC70 Package
APPLICATIONS
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Mobile Communications
Process Control and Industrial Automation
Automatic Test Equipment
Portable Equipment
Automotive
TYPICAL APPLICATION
V
CC
INTERNAL
REFERENCE
SDI
CONTROL
DECODE LOGIC
SCK
24-BIT
SHIFT
REGISTER
DACREF
CS/LD
–0.5
INPUT
REGISTER
DAC
REGISTER
DAC
V
OUT
RESISTOR
DIVIDER
INL (LSB)
0.5
Integral Nonlinearity (LTC2630A-LZ12)
1.0
V
CC
= 3V
V
FS
= 2.5V
0
–1.0
GND
2630 BD
0
1024
2048
CODE
3072
4095
2630 TA03
2630f
1
LTC2630
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
CS/LD 1
SCK 2
SDI 3
6 V
OUT
5 GND
4 V
CC
Supply Voltage (V
CC
) ................................... –0.3V to 6V
⎯
C
⎯
S/LD, SCK, SDI .......................................... –0.3V to 6V
V
OUT
.................................. –0.3V to min(V
CC
+ 0.3V, 6V)
Operating Temperature Range
LTC2630C ................................................ 0°C to 70°C
LTC2630I ............................................. –40°C to 85°C
LTC2630H .......................................... –40°C to 125°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
SC6 PACKAGE
6-LEAD PLASTIC SC70
T
JMAX
= 150°C (Note 4),
θ
JA
= 300°C/W
ORDER INFORMATION
LTC2630 A
C
SC6 –L
M
12
#TRM PBF
LEAD FREE DESIGNATOR
TAPE AND REEL
TR = Tape and Reel
TRM = 500-Piece Tape and Reel
RESOLUTION
12 = 12-Bit
10 = 10-Bit
8 = 8-Bit
POWER-ON RESET
M = Reset to Mid-Scale
Z = Reset to Zero-Scale
FULL-SCALE VOLTAGE, INTERNAL REFERENCE MODE
L = 2.5V
H = 4.096V
PACKAGE TYPE
SC6 = 6-Lead SC70
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (–40°C to 85°C)
H = Automotive Temperature Range (–40°C to 125°C)
ELECTRICAL GRADE (OPTIONAL)
A = ±1 LSB Maximum INL (12-Bit)
PRODUCT PART NUMBER
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/
2630f
2
LTC2630
PRODUCT SELECTION GUIDE
PART NUMBER
LTC2630A-LM12
LTC2630A-LZ12
LTC2630A-HM12
LTC2630A-HZ12
LTC2630-LM12
LTC2630-LM10
LTC2630-LM8
LTC2630-LZ12
LTC2630-LZ10
LTC2630-LZ8
LTC2630-HM12
LTC2630-HM10
LTC2630-HM8
LTC2630-HZ12
LTC2630-HZ10
LTC2630-HZ8
V
FS
WITH INTERNAL REFERENCE
2.5V • (4095/4096)
2.5V • (4095/4096)
4.096V • (4095/4096)
4.096V • (4095/4096)
2.5V • (4095/4096)
2.5V • (1023/1024)
2.5V • (255/256)
2.5V • (4095/4096)
2.5V • (1023/1024)
2.5V • (255/256)
4.096V • (4095/4096)
4.096V • (1023/1024)
4.096V • (255/256)
4.096V • (4095/4096)
4.096V • (1023/1024)
4.096V • (255/256)
POWER-ON RESET TO CODE
Mid-Scale
Zero
Mid-Scale
Zero
Mid-Scale
Mid-Scale
Mid-Scale
Zero
Zero
Zero
Mid-Scale
Mid-Scale
Mid-Scale
Zero
Zero
Zero
RESOLUTION
12-Bit
12-Bit
12-Bit
12-Bit
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
12-Bit
10-Bit
8-Bit
V
CC
2.7V–5.5V
2.7V–5.5V
4.5V–5.5V
4.5V–5.5V
2.7V–5.5V
2.7V–5.5V
2.7V–5.5V
2.7V–5.5V
2.7V–5.5V
2.7V–5.5V
4.5V–5.5V
4.5V–5.5V
4.5V–5.5V
4.5V–5.5V
4.5V–5.5V
4.5V–5.5V
MAXIMUM INL
±1LSB
±1LSB
±1LSB
±1LSB
±2LSB
±1LSB
±0.5LSB
±2LSB
±1LSB
±0.5LSB
±2LSB
±1LSB
±0.5LSB
±2LSB
±1LSB
±0.5LSB
2630f
3
LTC2630
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
OUT
unloaded unless otherwise specified.
LTC2630-LM12/-LM10/-LM8/-LZ12/-LZ10/-LZ8, LTC2630A-LM12/-LZ12 (V
FS
= 2.5V)
LTC2630-8
SYMBOL PARAMETER
DC Performance
Resolution
Monotonicity
DNL
INL
ZSE
V
OS
V
OSTC
FSE
V
FSTC
●
LTC2630-10
LTC2630-12
LTC2630A-12
MAX UNITS
Bits
Bits
±1
±0.5
0.5
±0.5
±10
±0.2
±10
±10
±10
0.13
0.256
±0.8
±1
5
±5
LSB
LSB
mV
mV
μV/°C
%FSR
ppm/°C
ppm/°C
ppm/°C
LSB/
mA
Ω
CONDITIONS
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP
8
8
±0.5
±0.05 ±0.5
0.5
±0.5
±10
●
10
10
±0.5
±0.2
0.5
±0.5
±10
±0.2 ±0.8
±10
±10
±10
0.03 0.064
±1
5
±5
12
12
±1
±1
0.5
±0.5
±10
±0.2 ±0.8
±10
±10
±10
0.13 0.256
±2
5
±5
12
12
V
CC
= 3V, Internal Ref. (Note 2)
●
Differential Nonlinearity V
CC
= 3V, Internal Ref. (Note 2)
●
Integral Nonlinearity
V
CC
= 3V, Internal Ref. (Note 2)
●
Zero Scale Error
Offset Error
V
OS
Temperature
Coefficient
Full Scale Error
Full Scale Voltage
Temperature
Coefficient
Load Regulation
V
CC
= 3V, Internal Ref., Code = 0
●
V
CC
= 3V, Internal Ref. (Note 3)
●
V
CC
= 3V, Internal Ref. (Note 3)
V
CC
= 3V, Internal Ref.
V
CC
= 3V, Internal Ref. (Note 8)
C-Grade
I-Grade
H-Grade
V
CC
= 3V ±10% or 5V ±10%,
Internal Ref., Midscale,
–5mA ≤ I
OUT
≤ 5mA
●
5
±5
±0.2 ±0.8
±10
±10
±10
0.008 0.016
R
OUT
DC Output Impedance V
CC
= 3V ±10% or 5V ±10%,
Internal Ref., Midscale,
–5mA ≤ I
OUT
≤ 5mA
●
0.08 0.156
0.08 0.156
0.08 0.156
0.08
0.156
SYMBOL PARAMETER
V
OUT
PSR
I
SC
DAC Output Span
Power Supply Rejection
Short Circuit Output Current (Note 4)
Sinking
Sourcing
Power Supply Voltage
Supply Current (Note 5)
CONDITIONS
Supply as Reference
Internal Reference
V
CC
= 3V ±10% or 5V ±10%
V
FS
= V
CC
= 5.5V
Zero Scale; V
OUT
Shorted to V
CC
Full Scale; V
OUT
Shorted to GND
For Specified Performance
Midscale
V
CC
= 3V, Supply as Reference
V
CC
= 3V, Internal Reference
V
CC
= 5V, Supply as Reference
V
CC
= 5V, Internal Reference
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
0V to V
CC
0V to 2.5
–80
27
–28
MAX
UNITS
V
V
dB
50
–50
5.5
mA
mA
V
μA
μA
μA
μA
μA
μA
V
V
Power Supply
V
CC
I
CC
2.7
160
180
180
190
0.36
0.36
2.4
2.0
0.8
0.6
±1
2.5
220
240
250
260
1.5
3
I
SD
Supply Current in Shutdown Mode (Note 5) V
CC
= 5V, C-Grade, I-Grade
V
CC
= 5V, H-Grade
Digital Input High Voltage
Digital Input Low Voltage
Digital Input Leakage
Digital Input Capacitance
V
CC
= 3.6V to 5.5V
V
CC
= 2.7V to 3.6V
V
CC
= 4.5V to 5.5V
V
CC
= 2.7V to 4.5V
V
IN
= GND to V
CC
(Note 6)
Digital I/O
V
IH
V
IL
I
LK
C
IN
V
V
μA
pF
2630f
4
LTC2630
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
AC Performance
t
S
Settling Time
V
CC
= 3V (Note 7)
±0.39% (±1LSB at 8 Bits)
±0.098% (±1LSB at 10 Bits)
±0.024% (±1LSB at 12 Bits)
3.2
3.9
4.4
1.0
500
At Midscale Transition
At f = 1kHz, Supply as Reference
At f = 10kHz, Supply as Reference
At f = 1kHz, Internal Reference
At f = 10kHz, Internal Reference
0.1Hz to 10Hz, Supply as Reference
0.1Hz to 10Hz, Internal Reference
0.1Hz to 200kHz, Supply as Reference
0.1Hz to 200kHz, Internal Reference
2
140
130
160
150
20
20
650
700
μs
μs
μs
V/μs
pF
nV•s
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
μV
P-P
μV
P-P
μV
P-P
μV
P-P
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
OUT
unloaded unless otherwise specified.
LTC2630-LM12/-LM10/-LM8/-LZ12/-LZ10/-LZ8, LTC2630A-LM12/-LZ12 (V
FS
= 2.5V)
CONDITIONS
MIN
TYP
MAX
UNITS
Voltage Output Slew Rate
Capacitive Load Driving
Glitch Impulse
e
n
Output Voltage Noise Density
Output Voltage Noise
TIMING CHARACTERISTICS
SYMBOL
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
10
PARAMETER
SDI Valid to SCK Setup
SDI Valid to SCK Hold
SCK High Time
SCK Low Time
⎯
C
⎯
S/LD Pulse width
SCK High to
⎯
C
⎯
S/LD High
⎯
C
⎯
S/LD Low to SCK High
⎯
C
⎯
S/LD High to SCK Positive Edge
SCK Frequency
The
●
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V. (See Figure 1) (Note 6).
LTC2630-LM12/-LM10/-LM8/-LZ12/-LZ10/-LZ8, LTC2630A-LM12/-LZ12 (V
FS
= 2.5V)
CONDITIONS
●
●
●
●
●
●
●
●
MIN
4
4
9
9
10
7
7
7
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
50% Duty Cycle
●
50
MHz
2630f
5
51单片机
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