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LTC1657L_15

Description
Parallel 16-Bit Rail-to-Rail Micropower DAC
File Size203KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1657L_15 Overview

Parallel 16-Bit Rail-to-Rail Micropower DAC

LTC1657/LTC1657L
Parallel 16-Bit Rail-to-Rail
Micropower DAC
FEATURES
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
16-Bit Monotonic Over Temperature
Deglitched Rail-to-Rail Voltage Output: 8nV•s
I
CC
: 650µA Typ
Maximum DNL Error:
±1LSB
Settling Time: 20µs to
±1LSB
Built-In Reference: 2.048V (LTC1657)
1.25V (LTC1657L)
Internal Power-On Reset to Zero Volts
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
Multiplying Capability
The LTC
®
1657/LTC1657L are complete single supply, rail-
to-rail voltage output, 16-bit digital-to-analog converters
(DAC) in a 28-pin SSOP or PDIP package. They include a
rail-to-rail output buffer amplifier, an internal reference
and a double buffered parallel digital interface.
The LTC1657/LTC1657L have separate reference input
pins 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 LTC1657
operates from a 4.5V to 5.5V supply and has an onboard
2.048V reference. The LTC1657L operates from a 2.7V to
5.5V supply and has an onboard 1.25V reference.
The LTC1657/LTC1657L are similar to Linear Technol-
ogy Corporation’s LTC1450/LTC1450L 12-bit V
OUT
DAC
family, allowing an upgrade path. They are the only
buffered 16-bit parallel DACs in a 28-lead SSOP package
and include an onboard reference for stand alone
performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Instrumentation
Digital Calibration
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
LTC1657: 4.5V TO 5.5V
LTC1657L: 2.7V TO 5.5V
23
REFOUT
REFERENCE
LTC1657: 2.048V
LTC1657L: 1.25V
MSB
8-BIT
INPUT
REGISTER
22
REFHI
24
V
CC
16-BIT
DAC
REGISTER
16-BIT
DAC
+
V
OUT
25
LTC1657:
0V TO 4.096V
LTC1657L:
0V TO 2.5V
DIFFERENTIAL NONLINEARITY (LSB)
LSB
8-BIT
INPUT
REGISTER
R
R
POWER-ON
RESET
GND
20
REFLO
21
X1/X2
26
1657 TA01
U
Differential Nonlinearity
vs Input Code
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
1657 TA02
W
U
1

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