Datasheet
2
LTC1257
(Note 1)
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
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
ORDER PART
NUMBER
LTC1257CN8
LTC1257IN8
S8 PART MARKING
T
JMAX
= 125°C, θ
JA
= 100°C/W
T
JMAX
= 125°C, θ
JA
= 150°C/W
LTC1257CS8
LTC1257IS8
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
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
1257
1257I
The ● 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.
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DAC
Resolution ● 12 Bits
DNL Differential Nonlinearity Guaranteed Monotonic (Note 4) ● ±0.5 LSB
INL Integral Nonlinearity LTC1257C (Note 4) ● ±3.5 LSB
LTC1257I (Note 4) ● ±4.0 LSB
OFF Offset Error When Using Internal Reference, LTC1257C ● ±8 LSB
When Using Internal Reference, LTC1257I
● ±10 LSB
When Using External Reference, LTC1257C ● ±4mV
When Using External Reference, LTC1257I
● ±5mV
OFF
TC
Offset Error Tempco When Using Internal Reference (Note 2) ● ±0.02 ±0.066 LSB/°C
When Using External Reference (Note 2)
● ±15 ±30 µV/°C
Gain Error ● 0.5 ±2 LSB
Gain Error Tempco (Note 2) ● ± 0.01 ±0.02 LSB/°C
Reference
Reference Output Voltage I
REF
= 0, LTC1257C ● 2.028 2.048 2.068 V
I
REF
= 0, LTC1257I ● 2.018 2.078 V
Reference Output Tempco I
REF
= 0 ● ±0.06 LSB/°C
Reference Line Regulation I
REF
= 0, LTC1257C ● ±0.4 LSB/V
I
REF
= 0, LTC1257I ● ±0.7 LSB/V
Reference Load Regulation 0 ≤ I
REF
≤ 100µA ● ±1 LSB
Reference Input Range V
CC
> V
REF
+ 2.7V ● 2.475 12 V
Reference Input Resistance ● 81418 kΩ
Reference Input Capacitance (Note 2) 15 pF
Short-Circuit Current V
REF
Shorted to GND ● 90 mA