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LTC1257CS8#PBF

P1-P3P4-P6P7-P9P10-P12
LTC1257
1
1257fc
TYPICAL APPLICATION
FEATURES DESCRIPTION
Complete Single Supply
12-Bit Voltage Output
DAC in SO-8
The LT C
®
1257 is a complete single supply, 12-bit voltage
output D/A converter (DAC) in an SO-8 package. The
LTC1257 includes an output buffer amplifier, 2.048V volt-
age reference and an easy to use 3-wire cascadable serial
interface. An external reference can be used to override
the internal reference and extend the output voltage
range
to 12V. The power supply current is a low 350µA when
operating from a 5V supply, making the LTC1257 ideal
for battery-powered applications. The space-saving 8-pin
SO package and operation with no external components
provide the smallest 12-bit D/A system available.
Daisy-Chained Control Outputs Differential Nonlinearity
vs Input Code
APPLICATIONS
n
8-Pin SO Package
n
Buffered Voltage Output
n
Built-In 2.048V Reference
n
500µV/LSB with 2.048V Full Scale
n
1/2LSB Max DNL Error
n
Guaranteed 12-Bit Monotonic
n
3-Wire Cascadable Serial Interface
n
Wide Single Supply Range: V
CC
= 4.75V to 15.75V
n
Low Power: I
CC
Typ = 350µA with 5V Supply
n
Digital Offset/Gain Adjustment
n
Industrial Process Control
n
Automatic Test Equipment
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
µP
5V
0.1µF
0.1µF
CONTROL OUTPUT 1
CONTROL OUTPUT 2
V
CC
V
REF
GND
V
OUT
D
IN
CLK
LOAD
D
OUT
LTC1257
V
CC
V
REF
GND
V
OUT
D
IN
CLK
LOAD
D
OUT
LTC1257
TO NEXT DAC
1257 TA01
CODE
0
DNL ERROR (LSBs)
0.5
0.0
–0.5
1024 2048 2560
1257 TA05
512 1536 3072 3584
4098
LTC1257
2
1257fc
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ............................................. –0.5V to 16.5V
TTL Input Voltage
.......................... –0.5V to V
CC
+ 0.5V
V
OUT
................................................ –0.5V to V
CC
+ 0.5V
REF
................................................. –0.5V to V
CC
+ 0.5V
Operating Temperature Range
LTC1257C ................................................ 0°C to 70°C
LTC1257I ............................................. –40°C to 85°C
(Note 1)
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1257CN8#PBF LTC1257CN8#TRPBF LTC1257CN8 8-Lead PDIP 0°C to 70°C
LTC1257IN8#PBF LTC1257IN8#TRPBF LTC1257IN8 8-Lead PDIP –40°C to 85°C
LTC1257CS8#PBF LTC1257CS8#TRPBF 1257 8-Lead Plastic SO 0°C to 70°C
LTC1257IS8#PBF LTC1257IS8#TRPBF 1257I 8-Lead Plastic SO –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature
ranges.
Consult LT C Marketing for information on nonstandard 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/
1
2
3
4
8
7
6
5
TOP VIEW
N8 PACKAGE
8-LEAD PDIP
V
CC
V
OUT
REF
GND
CLK
D
IN
LOAD
D
OUT
T
JMAX
= 125°C, θ
JA
= 100°C/W
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
V
CC
V
OUT
REF
GND
CLK
D
IN
LOAD
D
OUT
T
JMAX
= 125°C, θ
JA
= 150°C/W
PIN CONFIGURATION
Maximum Junction Temperature
Plastic Package
...................................... –65°C to 125°C
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
...................300°C
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= T
MIN
to T
MAX
. V
CC
= 4.75V to 15.75V, internal or external reference
(2.475V ≤ V
REF
≤ V
CC
– 2.7V), unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DAC
Resolution
l
12 Bits
DNL Differential Nonlinearity Guaranteed Monotonic (Note 4)
l
±0.5 LSB
INL Integral Nonlinearity LTC1257C (Note 4)
LTC1257I (Note 4)
l
l
±3.5
±4.0
LSB
LSB
LTC1257
3
1257fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= T
MIN
to T
MAX
. V
CC
= 4.75V to 15.75V, internal or external reference
(2.475V ≤ V
REF
≤ V
CC
– 2.7V), unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
OFF Offset Error When Using Internal Reference, LTC1257C
When Using Internal Reference, LTC1257I
l
l
±8
±10
LSB
LSB
When Using External Reference, LTC1257C
When Using External Reference, LTC1257I
l
l
±4
±5
mV
mV
OFF
TC
Offset Error Tempco When Using Internal Reference (Note 2)
When Using External Reference (Note 2)
l
l
±0.02
±15
±0.066
±30
LSB/°C
µV/°C
Gain Error
l
0.5 ±2 LSB
Gain Error Tempco (Note
2)
l
±0.01 ±0.02 LSB/°C
Reference
Reference Output Voltage I
REF
= 0, LTC1257C
I
RE
F = 0, LTC1257I
l
l
2.028
2.018
2.048 2.068
2.078
V
V
Reference Output Tempco I
REF
= 0
l
±0.06 LSB/°C
Reference Line Regulation I
REF
= 0, LTC1257C
I
REF
= 0, LTC1257I
l
l
±0.4
±0.7
LSB/V
LSB/V
Reference Load Regulation 0µA ≤ I
REF
≤ 100µA
l
±1 LSB
Reference Input Range V
CC
> V
REF
+ 2.7V
l
2.475 12 V
Reference Input Resistance
l
8 14 18 kΩ
Reference Input Capacitance (Note 2)
15 pF
Short-Circuit Current V
REF
Shorted to GND
l
90 mA
Power Supply
V
CC
Positive Supply Voltage For Specified Performance
l
4.75 15.75 V
I
CC
Supply Current 4.75V ≤ V
CC
≤ 5.25V
4.75V ≤ V
CC
≤ 15.75V
l
l
350
800
600
1500
µA
µA
Op Amp DC Performance
Short-Circuit Current Low V
OUT
Shorted to GND
l
60 mA
Short-Circuit Current High V
OUT
Shorted to V
CC
l
60 mA
Output Impedance to GND Input Code = 0
l
250 500 Ω
AC Performance
Voltage
Output Slew Rate 5kΩ in Parallel with 100pF
l
1.0 V/µs
Voltage Output Settling Time To ±1/2LSB, 5kΩ in Parallel with 100pF, V
CC
= 4.75V 6 µs
Digital Feedthrough (Notes 2, 3) 50 nV/s
Digital I/O
V
IH
Digital Input High Voltage
l
2.4 V
V
IL
Digital Input Low Voltage
l
0.8 V
V
OH
Digital Output High Voltage I
OUT
= –1mA, D
OUT
Only
l
V
CC
– 1 V
V
OL
Digital Output Low Voltage I
OUT
= 1mA, D
OUT
Only
l
0.4 V
I
LEAK
Digital Input Leakage V
IN
= GND to V
CC
l
±10 µA
C
IN
Digital Input Capacitance (Note 2)
l
10 pF
Switching (Note 2)
t
1
D
IN
Valid to CLK Setup
l
100 ns
t
2
D
IN
Valid to CLK Hold
l
25 ns
t
3
CLK High Time
l
350 ns
t
4
CLK Low Time
l
350 ns
P1-P3P4-P6P7-P9P10-P12

LTC1257CS8#PBF

Mfr. #:
Buy LTC1257CS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Digital to Analog Converters - DAC 12-bit Vout DAC w/ Internal Reference
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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