LTC1589_15 Datasheet, PDF (16/16 Pages) Linear Technology – 12-/14-/16-Bit SoftSpan DACs with Programmable Output Range

LTC1588/LTC1589/LTC1592
APPLICATIO S I FOR ATIO
2
V_CC
R1
SCK ^{7.5k 3}
TO
µCONTROLLER
2
V_CC
R2
SDI ^{7.5k 3}
HCPL2300
HCPL2300
OPTIONAL CIRCUIT FOR 2-WIRE INTERFACE.
FOR A 3-WIRE INTERFACE (SPI), ADD A 3RD
OPTOISOLATOR TO DRIVE CS/LD WITH THE
WAVEFORMS OF FIGURE 1
8
5V
7
6
5
74HC161
GND
3
A
4
QA
14
13
ISOLATED
CS/LD
B QB
5
12
C QC
6 _{D QD} 11
2 _CLK
7 _ENP
10 _ENT
9
1
LD
15
CLR RCO
5V
8
5V
7
6
5
ISOLATED SCK
ISOLATED SDI
0.1µF
10µF
12V
7
2_–
0.1µF
6
LT1468
3₊
10µF
4
–12V
0.1µF
150pF
5V REF
+
12V
8
4
LT1027-5
10µF
2
2
1
R1 R_COM
5V
R1
R2
16 15 3
4
R2 REF R_OFS R_FB
9 _VCC
I_{OUT1 5}
14
CLR
13
CS/LD
12
SCK
11
SDI
10
SDO
12-/14-/16-BIT DAC WITH SPAN ADJUST
LTC1588/LTC1589/LTC1592
I_OUT2 6
7
AGND
8
GND
15pF
10µF
12V
2– ⁷
0.1µF _AGND
6
LT1468
3+
10µF
4
–12V
V_OUT
1588992 F04
0.1µF AGND
Figure 4. Optically Isolated 16-Bit SoftSpan System
SCK
SDI
CS/LD
C3
C2
C1
C0
X
D2
D1
D0
Figure 5. Timing Diagram for the Circuit of Figure 4
1588992 F05
RELATED PARTS
PART NUMBER
LTC1591/LTC1597
LTC1595/LTC1596
LTC1599
LTC1821
LTC2600/LTC2610
LTC2620
DESCRIPTION
Parallel 14-/16-Bit Current Output DACs
Serial 16-Bit Current Output DACs
2-Byte, 16-Bit Current Output DAC
Parallel 16-Bit Voltage Outupt DAC
Octal 16-/14-/12-Bit DACs
COMMENTS
On-Chip 4-Quadrant Resistors
Low Glitch, ±1LSB Maximum INL, DNL
On-Chip 4-Quadrant Resistors
Precision 16-Bit Settling in 2µs for 10V Step
Single Supply, µPower in Narrow SSOP16
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX: [phone] ^q www.linear.com
1588992fa
LT/TP 0503 1K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001