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PDF LTC1821 Data sheet ( Hoja de datos )
| Número de pieza | LTC1821 | |
| Descripción | Fast Settling Vout DAC | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1821 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
s 2µs Settling to 0.0015% for 10V Step
s 1LSB Max DNL and INL Over Industrial
Temperature Range
s On-Chip 4-Quadrant Resistors Allow Precise 0V to
10V, 0V to –10V or ±10V Outputs
s Low Glitch Impulse: 2nV•s
s Low Noise: 13nV/√Hz
s 36-Lead SSOP Package
s Power-On Reset
s Asynchronous Clear Pin
LTC1821: Reset to Zero Scale
LTC1821-1: Reset to Midscale
U
APPLICATIO S
s Process Control and Industrial Automation
s Precision Instrumentation
s Direct Digital Waveform Generation
s Software-Controlled Gain Adjustment
s Automatic Test Equipment
LTC1821
16-Bit, Ultra Precise,
Fast Settling VOUT DAC
DESCRIPTIO
The LTC®1821 is a parallel input 16-bit multiplying voltage
output DAC that operates from analog supply voltages of
±5V up to ±15V. INL and DNL are accurate to 1LSB over the
industrial temperature range in both unipolar 0V to 10V and
bipolar±10Vmodes.Precise16-bitbipolar ±10Voutputsare
achieved with on-chip 4-quadrant multiplication resistors.
The LTC1821 is available in a 36-lead SSOP package and is
specified over the industrial temperature range.
The device includes an internal deglitcher circuit that reduces
the glitch impulse to less than 2nV•s (typ). The LTC1821
settles to 1LBS in 2µs with a full-scale 10V step. The
combination of fast, precise settling and ultra low glitch make
the LTC1821 ideal for precision industrial control applica-
tions.
The asynchronous CLR pin resets the LTC1821 to zero scale
and resets the LTC1821-1 to midscale.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
16-Bit, 4-Quadrant Multiplying DAC with a
Minimum of External Components
VREF
–VREF
3+
LT®1468
2–
6
15pF
5V
0.1µF
15pF
10 9
R1 RCOM
8 2 11
REF VCC ROFS
12 14
RFB IOUT
16
DATA
INPUTS
R1 R2
LTC1821-1
ROFS RFB
16-BIT DAC
–
+
3 TO 6,
25 TO 36
WR LD CLR
WR 24 23 7
LD
CLR
DNC* DNC* DNC* NC DGND
18 19 21 22
1
AGNDF AGNDS
17 16
*DO NOT CONNECT
V+ 15
13
VOUT
V– 20
15V
0.1µF
VREF
VOUT =
–VREF
–15V
0.1µF
1821 TA01
LTC1821/LTC1821-1
Integral Nonlinearity
1.0
0.8
VREF = 10V
VOUT = ±10V BIPOLAR
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384 32768 49152
DIGITAL INPUT CODE
65535
1821 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1821
Logic Threshold vs VCC Supply
Voltage
3.0
2.5
2.0
1.5
1.0
0.5
0
01234567
SUPPLY VOLTAGE (V)
1821 G07
Integral Nonlinearity vs Reference
Voltage in Unipolar Mode
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6 8 10
REFERENCE VOLTAGE (V)
1821 G10
Differential Nonlinearity vs
Reference Voltage in Bipolar Mode
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6 8 10
REFERENCE VOLTAGE (V)
1821 G13
Integral Nonlinearity (INL)
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
0
16384 32768 49152
DIGITAL INPUT CODE
65535
1821 G08
Integral Nonlinearity vs Reference
Voltage in Bipolar Mode
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
8 10
1821 G11
Integral Nonlinearity vs VCC Supply
Voltage in Unipolar Mode
1.0
0.8
0.6
0.4 VREF = 10V
0.2 VREF = 2.5V
0 VREF = 10V
– 0.2
VREF = 2.5V
– 0.4
– 0.6
– 0.8
– 1.0
2
3 456
SUPPLY VOLTAGE (V)
7
1821 G14
Differential Nonlinearity (DNL)
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
0
16384 32768 49152
DIGITAL INPUT CODE
65535
1821 G09
Differential Nonlinearity vs
Reference Voltage in Unipolar Mode
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6 8 10
REFERENCE VOLTAGE (V)
1821 G12
Integral Nonlinearity vs VCC Supply
Voltage in Bipolar Mode
2.0
1.5
1.0
0.5
0
– 0.5
–1.0
VREF = 10V
VREF = 2.5V
VREF = 10V
VREF = 2.5V
–1.5
– 2.0
2
3456
SUPPLY VOLTAGE (V)
7
1821 G15
5
5 Page 
LTC1821
APPLICATIONS INFORMATION
Bipolar Mode
(4-Quadrant Multiplying, VOUT = – VREF to VREF)
The LTC1821 contains on chip all the 4-quadrant resistors
necessary for bipolar operation. 4-quadrant multiplying
operation can be achieved with a minimum of external
components—a capacitor and a single op amp, as shown
in Figure 2. With a fixed 10V reference, the circuit shown
gives a precision bipolar – 10V to 10V output swing.
VREF
3+
LT1001
2–
6
5V
0.1µF
22pF
16
DATA
INPUTS
10 9
R1 RCOM
R1 R2
LTC1821
8 2 11
REF VCC ROFS
ROFS
12
RFB
RFB
16-BIT DAC
14
IOUT
V+ 15
–
+
13
VOUT
25 TO 36,
3 TO 6
V– 20
WR LD CLR DNC* DNC* DNC* NC
WR 24 23 7 18 19 21 22
LD
CLR
DGND
1
AGNDF AGNDS
17 16
*DO NOT CONNECT
15V
0.1µF
VOUT =
–VREF
TO VREF
–15V
0.1µF
Bipolar Offset Binary Code Table
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
MSB LSB
1111
1000
1000
0111
0000
1111
0000
0000
1111
0000
1111
0000
0000
1111
0000
1111
0001
0000
1111
0000
ANALOG OUTPUT
VOUT
VREF (32,767/32,768)
VREF (1/32,768)
0V
–VREF (1/32,768)
–VREF
1821 F02
Figure 2. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1821.PDF ] | |
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