LTC1821
16-Bit, Ultra Precise,
Fast Settling V
OUT
DAC
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
2µs Settling to 0.0015% for 10V Step
1LSB Max DNL and INL Over Industrial
Temperature Range
On-Chip 4-Quadrant Resistors Allow Precise 0V to
10V, 0V to –10V or
±10V
Outputs
Low Glitch Impulse: 2nV•s
Low Noise: 13nV/√Hz
36-Lead SSOP Package
Power-On Reset
Asynchronous Clear Pin
LTC1821: Reset to Zero Scale
LTC1821-1: Reset to Midscale
APPLICATIO S
s
s
s
s
s
Process Control and Industrial Automation
Precision Instrumentation
Direct Digital Waveform Generation
Software-Controlled Gain Adjustment
Automatic Test Equipment
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
±10V
modes. Precise 16-bit bipolar
±10V
outputs are
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
V
REF
–V
REF
16-Bit, 4-Quadrant Multiplying DAC with a
Minimum of External Components
LTC1821/LTC1821-1
Integral Nonlinearity
1.0
0.8
INTEGRAL NONLINEARITY (LSB)
10
R1
R1
16
DATA
INPUTS
3 TO 6,
25 TO 36
9
R
COM
R2
LTC1821-1
16-BIT DAC
WR LD CLR
WR
LD
CLR
24 23
7
DNC* DNC* DNC* NC
18
19
21
22
DGND
1
AGNDF AGNDS
17
16
1821 TA01
*DO NOT CONNECT
+
–
–
2
+
3
5V
6
0.1µF
LT
®
1468
15pF
15pF
8
2
V
CC
11
R
OFS
R
OFS
R
FB
13
V
OUT
V
–
12
R
FB
14
I
OUT
V
+
15
15V
0.1µF
V
REF
V
OUT
=
–V
REF
–15V
0.1µF
REF
20
U
V
REF
= 10V
V
OUT
=
±10V
BIPOLAR
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
49152
32768
16384
DIGITAL INPUT CODE
65535
1821 TA02
U
U
1
LINER [ LINEAR TECHNOLOGY ]
