Final Electrical Specifications
LTC1657L
Parallel 16-Bit Rail-to-Rail
Micropower DAC
FEATURES
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DESCRIPTION
April 2000
16-Bit Monotonic Over Temperature
3V Single Supply Operation
Deglitched Rail-to-Rail Voltage Output: 8nV 鈥?s
I
CC
: 650碌A(chǔ) Typ
Maximum DNL Error:
鹵1LSB
Settling Time: 20碌s to
鹵1LSB
Internal or External Reference
Internal Power-On Reset to 0V
Asynchronous CLR Pin
Output Buffer Configurable for Gain of 1 or 2
Parallel 16-Bit or 2-Byte Double Buffered Interface
Narrow 28-Lead SSOP Package
5V Version Available (LTC1657)
The LTC
廬
1657L is a complete single supply, rail-to-rail
voltage output, 16-bit digital-to-analog converter (DAC) in
a 28-pin SSOP or PDIP package. It includes a rail-to-rail
output buffer amplifier, an internal 1.25V reference and a
double buffered parallel digital interface.
The LTC1657L operates from a 2.7V to 5.5V supply. It has
a separate reference input pin that can be driven by an
external reference. The full-scale output can be 1 or 2
times the reference voltage depending on how the X1/X2
pin is connected.
The LTC1657L is similar to Linear Technology Corporation鈥檚
LTC1450 12-bit V
OUT
DAC family allowing an easy up-
grade path. It is the only buffered 16-bit parallel DAC in a
28-lead SSOP package and includes an onboard reference
for stand alone performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
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Instrumentation
Industrial Process Control
Automatic Test Equipment
Communication Test Equipment
BLOCK DIAGRA
19 D15 (MSB)
18
17
16
15
14
13
12
DATA IN FROM
MICROPROCESSOR
DATA BUS
D8
11 D7
10
9
8
7
6
5
4 D0 (LSB)
3 CSMSB
FROM
MICROPROCESSOR
DECODE LOGIC
1 WR
2 CSLSB
28 LDAC
FROM
SYSTEM RESET
27 CLR
2.7V TO 5.5V
23
REFOUT
REFERENCE
1.25V
MSB
8-BIT
INPUT
REGISTER
1.0
22
REFHI
24
V
CC
16-BIT
DAC
REGISTER
16-BIT
DAC
+
鈥?/div>
V
OUT
25 0V TO
2.5V
DNL ERROR (LSB)
LSB
8-BIT
INPUT
REGISTER
R
R
POWER-ON
RESET
GND
20
REFLO
21
X1/X2
26
1657 TA01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
W
U
Differential Nonlinearity
vs Input Code
0.8
0.6
0.4
0.2
0
鈥?0.2
鈥?0.4
鈥?0.6
鈥?0.8
鈥?1.0
0
16484
32768
CODE
49152
65535
1657 TA02
1
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