LTC1657L_15 Datasheet, PDF (1/16 Pages) Linear Technology – Parallel 16-Bit Rail-to-Rail Micropower DAC

FEATURES
s _{16-Bit Monotonic Over Temperature}
s _{Deglitched Rail-to-Rail Voltage Output: 8nV•s}
s _{ICC: 650µA Typ}
s _{Maximum DNL Error: ±1LSB}
s _{Settling Time: 20µs to ±1LSB}
s _{Built-In Reference: 2.048V (LTC1657)}
1.25V (LTC1657L)
s _{Internal Power-On Reset to Zero Volts}
s _{Asynchronous CLR Pin}
s _{Output Buffer Configurable for Gain of 1 or 2}
s _{Parallel 16-Bit or 2-Byte Double Buffered Interface}
s _{Narrow 28-Lead SSOP Package}
s _{Multiplying Capability}
U
APPLICATIO S
s _{Instrumentation}
s _{Digital Calibration}
s _{Industrial Process Control}
s _{Automatic Test Equipment}
s _{Communication Test Equipment}
LTC1657/LTC1657L
Parallel 16-Bit Rail-to-Rail
Micropower DAC
DESCRIPTIO
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.
BLOCK DIAGRA
DATA IN FROM
MICROPROCESSOR
DATA BUS
FROM
MICROPROCESSOR
DECODE LOGIC
FROM
SYSTEM RESET
19 D15 (MSB)
18
17
16
15
14
13
12
D8
11 D7
10
9
8
7
6
5
4 D0 (LSB)
3 CSMSB
1 WR
2 CSLSB
28 LDAC
27 CLR
MSB
8-BIT
INPUT
REGISTER
23
REFOUT
REFERENCE
LTC1657: 2.048V
LTC1657L: 1.25V
LTC1657: 4.5V TO 5.5V
LTC1657L: 2.7V TO 5.5V
22
24
REFHI
V_CC
LSB
8-BIT
INPUT
REGISTER
16-BIT
DAC
REGISTER
POWER-ON
RESET
16-BIT
DAC
GND
20
+
–
R
R
REFLO X1/X2
21
26
V_OUT
LTC1657:
25 _{0V TO 4.096V}
LTC1657L:
0V TO 2.5V
Differential Nonlinearity
vs Input Code
1657 TA01
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
1