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LTC1427CS8-50#TRPBF

P1-P3P4-P6P7-P8
1
LTC1427-50
Micropower, 10-Bit Current
Output DAC with SMBus
Serial Interface
1
2
3
4
8
7
6
5
1427 TA02
C1
1µF
1µF
1
2
56
4
3
4700pF
V
CC
3.3V
V
OUT
*
*V
OUT
= 12.7V TO 24V IN 11mV STEPS
15mA (2 CELLS)
35mA ( 3 CELLS)
L1 =10 µH SUMIDA CD43
MURATA-ERIE LQH3C
OR COILCRAFT DO1608
D1 =MBR0530
100k
D1
2 TO 4
CELLS
L1
LTC1427-50
R1
226k
1%
R2
12.1k
1%
SHDN
AD1
AD0
GND
V
CC
I
OUT
SCL
SDA
P1.2
P1.1
P1.0
V
IN
V
C
GND
LT1317
SW
FB
SHDN
SHDN
µPU
(e.g., 8051)
TYPICAL APPLICATION
U
Digitally Controlled LCD Bias Generator
FEATURES
DESCRIPTION
U
■
LCD Contrast and Backlight Brightness Control
■
Power Supply Voltage Adjustment
■
Battery Charger Voltage/Current Adjustment
■
GaAs FET Bias Adjustment
■
Trimmer Pot Elimination
The LTC
®
1427-50 is a micropower, 10-Bit current output
DAC with an output range of 0µA to 50µA. The DAC output is
guaranteed monotonic and DNL is less than 0.9LSB under all
operating conditions. Full-scale accuracy is ±2.5% over
the commercial temperature range. The LTC1427-50 oper-
ates with power supply voltages from 2.7V to 5.5V and the
DAC current source output can be biased from (V
CC
– 1.3V)
to –15V.
The LTC1427-50 communicates with external circuitry by
using the SMBus serial interface. It acts as an SMBus slave
device using one of four selectable SMBus addresses set by
the two address pins AD0 and AD1 .
On power-up, the DAC output assumes midrange or zero
scale, depending on the logic state of the two address pins.
The LTC1427-50 can be shut down through the SHDN pin or
by setting the SHDN bit = 1 in the SMBus command byte.
Digital data for the DAC output is retained internally and the
supply current drops to 10µA typically when in shutdown.
The LTC1427-50 is available in an 8-pin SO package.
APPLICATIONS
U
■
Precision 50
µ
A,
±
1.5% Initial Full-Scale Output
Current,
±
2.5% Over Temperature
■
Wide Output Voltage DC Compliance: –15V to
(V
CC
– 1.3V)
■
Wide Supply Range: 2.7V ≤ V
CC
≤ 5.5V
■
Supply Current in Shutdown: 10µA Typ
■
Low Supply Current: 115µA Typ
■
Available in 8-Pin SO
■
SMBus Serial Interface
■
Four Selectable SMBus Addresses
■
DAC Powers Up at Zero or Midscale
■
DAC Contents Are Retained in Shutdown
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LTC1427-50
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
ELECTRICAL CHARACTERISTICS
T
A
= operating temperature range unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage ● 2.7 5.5 V
I
CC
Supply Current V
SHDN
= V
SCL
= V
SDA
= V
CC
= 3.3V ● 115 225 µA
V
SHDN
= 0V ● 10 25 µA
DAC Resolution ● 10 Bits
I
FS
DAC Full-Scale Current V
CC
= 3.3V, V(I
OUT
) = 0V 49.25 50 50.75 µA
● 48.75 50 51.25 µA
I
ZS
DAC Zero-Scale Current V
CC
= 3.3V, V(I
OUT
) = 0V ● ±0.1 ±200 nA
DNL DAC Differential Nonlinearity V
CC
= 3.3V, Monotonicity Guaranteed, V(I
OUT
) = 0V ● ±0.15 ±0.9 LSB
Supply Voltage Rejection V
CC
= 2.7V to 5.5V, V(I
OUT
) = 0V ● ±8 LSB
Output Voltage Rejection V
CC
= 3.3V, Full-Scale Current, – 15V ≤ V(I
OUT
) ≤ 2V ● ±5 LSB
I
IN
Logic Input Current 0V ≤ V
IN
≤ V
CC
● ±1 µA
V
IH
High Level Input Voltage AD0, AD1 ● V
CC
– 0.3 V
SHDN
● 2.4 V
SCL, SDA
● 1.4 V
V
IL
Low Level Input Voltage SHDN, AD0, AD1 ● 0.8 V
SCL, SDA
● 0.6 V
V
OL
Low Level Output Voltage I
OUT
= 3mA, SDA Only ● 0.4 V
Consult factory for Industrial and Military grade parts.
T
JMAX
= 125°C, θ
JA
= 190°C/ W
TOP VIEW
V
CC
I
OUT
SCL
SDA
SHDN
AD1
AD0
GND
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
S8 PART MARKING
LTC1427CS8-50
14275
(Note 1)
Total Supply Voltage (V
CC
) ........................................ 7V
Input Voltage (All Inputs)............. –0.3V to (V
CC
+ 0.3V)
DAC Output Voltage ...................... –15V to (V
CC
+ 0.3V)
DAC Output Short-Circuit Duration .................. Indefinite
Operating Ambient Temperature Range....... 0°C to 70°C
Junction Temperature.......................................... 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
3
LTC1427-50
RECO E DED OPERATI G CO DITIO S
UUUUWW
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
CODE
0
INL (LSB)
512 1024
1247 G02
6
4
2
0
–2
–4
–6
–8
–10
INL vs Code
CODE
0
DNL (LSB)
512 1024
1247 G01
1.0
0.5
0
–0.5
–1.0
DNL vs Code
V
CC
= 3.3V, T
A
= operating temperature range unless otherwise specified.
Note 2: All values are referenced to V
IH
and V
IL
levels.
Note 3: These parameters are guaranteed by design and are not tested.
Refer to the Timing Diagrams for additional information.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SMBus Timing (Notes 2, 3)
f
SMB
SMB Operating Frequency ● 10 100 kHz
t
BUF
Bus Free Time Between Stop and Start Condition ● 4.7 µs
t
HD:STA
Hold Time After (Repeated) Start Condition ● 4.0 µs
t
SU:STA
Repeated Start Condition Setup Time ● 4.7 µs
t
SU:STO
Stop Condition Setup Time ● 4.0 µs
t
HD:DAT
Data Hold Time ● 300 ns
t
SU:DAT
Data Setup Time ● 250 ns
t
LOW
Clock Low Period ● 4.7 µs
t
HIGH
Clock High Period ● 4.0 50 µs
t
f
Clock/Data Fall Time ● 300 ns
t
r
Clock/Data Rise Time ● 1000 ns
The ● denotes specifications that apply over the full operating temperature
range.
Note 1: Absolute Maximum Ratings are those beyond which the life of the
device may be impaired.
P1-P3P4-P6P7-P8

LTC1427CS8-50#TRPBF

Mfr. #:
Buy LTC1427CS8-50#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Digital to Analog Converters - DAC uP, 10-B C Out DAC w/ SMBus Serial Int
Lifecycle:
New from this manufacturer.
Delivery:
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