LTC1657/LTC1657L
Parallel 16-Bit Rail-to-Rail
Micropower DAC
FEATURES
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DESCRIPTION
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 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 Technology
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.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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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
Multiplying Capability
Narrow 28-Lead SSOP Package
APPLICATIONS
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Instrumentation
Digital Calibration
Industrial Process Control
Automatic Test Equipment
Communication Test Equipment
BLOCK DIAGRAM
23
19 D15 (MSB)
18
17
16
15
14
13
DATA IN FROM
MICROPROCESSOR
DATA BUS
12
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
POWER-ON
RESET
GND
20
REFLO
21
LSB
8-BIT
INPUT
REGISTER
16-BIT
DAC
REGISTER
16-BIT
DAC
MSB
8-BIT
INPUT
REGISTER
REFOUT
REFERENCE
LTC1657: 2.048V
LTC1657L: 1.25V
22
REFHI
LTC1657: 4.5V TO 5.5V
LTC1657L: 2.7V TO 5.5V
24
V
CC
Differential Nonlinearity
vs Input Code
1.0
DIFFERENTIAL NONLINEARITY (LSB)
0.8
0.6
0.4
0.2
0
+
–
R
R
V
OUT
25
LTC1657:
0V TO 4.096V
LTC1657L:
0V TO 2.5V
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
49152
DIGITAL INPUT CODE
65535
1657 TA02
X1/X2
26
1657 TA01
1657lfa
For more information
www.linear.com/LTC1657
1
LTC1657/LTC1657L
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
WR
CSLSB
CSMSB
(LSB) D0
D1
D2
D3
D4
D5
1
2
3
4
5
6
7
8
9
28
LDAC
27
CLR
26 X1/X2
25 V
OUT
24 V
CC
23 REFOUT
22 REFHI
21 REFLO
20 GND
19 D15 (MSB)
18 D14
17 D13
16 D12
15 D11
V
CC
to GND ............................................... –0.5V to 7.5V
TTL Input Voltage, REFHI, REFLO,
X1/X2 ....................................................... –0.5V to 7.5V
V
OUT
, REFOUT ............................. –0.5V to (V
CC
+ 0.5V)
Operating Temperature Range
LTC1657C/LTC1657LC ........................... 0°C to 70°C
LTC1657I/LTC1657LI ......................... –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
D6 10
D7 11
D8 12
D9 13
D10 14
OBSOLETE PACKAGE
GN PACKAGE
N PACKAGE
28-LEAD PLASTIC SSOP
28-LEAD PDIP
T
JMAX
= 125°C,
θ
JA
= 95°C/W (GN)
T
JMAX
= 125°C,
θ
JA
= 58°C/W (N)
ORDER INFORMATION
LEAD FREE FINISH
LTC1657CGN#PBF
LTC1657IGN#PBF
LTC1657LCGN#PBF
LTC1657LIGN#PBF
LTC1657CN#PBF
LTC1657IN#PBF
LTC1657LCN#PBF
LTC1657LIN#PBF
TAPE AND REEL
LTC1657CGN#TRPBF
LTC1657IGN#TRPBF
LTC1657LCGN#TRPBF
LTC1657LIGN#TRPBF
LTC1657CN#TRPBF
LTC1657IN#TRPBF
LTC1657LCN#TRPBF
LTC1657LIN#TRPBF
PART MARKING
1657CGN
1657IGN
1657LCGN
1657LIGN
1657CN
1657IN
1657LCN
1657LIN
PACKAGE DESCRIPTION
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead PDIP
28-Lead PDIP
28-Lead PDIP
28-Lead PDIP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
OBSOLETE PACKAGE
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
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1657lfa
For more information
www.linear.com/LTC1657
LTC1657/LTC1657L
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 4.5V to 5.5V (LTC1657), V
CC
= 2.7V to 5.5V (LTC1657L),
V
OUT
unloaded, REFOUT tied to REFHI, REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted.
SYMBOL
DAC (Note 2)
Resolution
Monotonicity
DNL
INL
ZSE
V
OS
V
OS
TC
Differential Nonlinearity
Integral Nonlinearity
Zero Scale Error
Offset Error
Offset Error Tempco
Gain Error
Gain Error Drift
Power Supply
V
CC
I
CC
Positive Supply Voltage
Supply Current
Short-Circuit Current Low
Short-Circuit Current High
Output Impedance to GND
Output Line Regulation
AC Performance
Voltage Output Slew Rate
Voltage Output Settling Time
Digital Feedthrough
Midscale Glitch Impulse
Output Voltage Noise Using
Internal Reference at 1kHz
Output Voltage Noise Using
External Reference at 1kHz
Output Voltage Noise Density Using
Internal Reference from 0.1Hz to 10Hz
Reference Input Multiplying BW
(Note 5)
(Note 5) to 0.0015% (16-Bit Settling Time)
(Note 5) to 0.012% (13-Bit Settling Time)
(Note 6)
DAC Switch Between 8000H and 7FFFH
X1/X2 Tied to V
OUT
(Notes 8, 9)
LTC1657
LTC1657L
X1/X2 Tied to V
OUT
(Notes 8, 9, 10)
X1/X2 Tied to V
OUT
(Notes 8, 9)
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ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
16
16
TYP
MAX
UNITS
Bits
Bits
Guaranteed Monotonic (Note 3)
(Note 3)
Measured at Code 200 (LTC1657)
Measured at Code 200 (LTC1657L)
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±0.5
±4
0
±0.3
±0.4
±5
±2
0.5
1.0
±1
±12
2
±3
±4
±16
LSB
LSB
mV
mV
mV
µV/°C
LSB
ppm/°C
ppm/°C
LTC1657
LTC1657L
For Specified Performance (LTC1657)
For Specified Performance (LTC1657L)
(Note 4)
V
OUT
Shorted to GND
V
OUT
Shorted to V
CC
Input Code = 0 (LTC1657)
Input Code = 0 (LTC1657L)
Input Code = 65535, LTC1657: V
CC
= 4.5V to 5.5V
Input Code = 65535, LTC1657L: V
CC
= 2.7V to 5.5V
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4.5
2.7
650
70
80
40
120
5.5
5.5
1200
120
140
120
275
4
3
V
V
µA
mA
mA
Ω
Ω
mV/V
mV/V
V/µs
µs
µs
nV•s
nV•s
nV/√Hz
nV/√Hz
nV/√Hz
µV
P-P
kHz
Op Amp DC Performance
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±0.3
±0.7
20
10
0.3
8
165
105
50
8
700
1657lfa
For more information
www.linear.com/LTC1657
3
LTC1657/LTC1657L
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 4.5V to 5.5V (LTC1657), V
CC
= 2.7V to 5.5V (LTC1657L),
V
OUT
unloaded, REFOUT tied to REFHI, REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted.
SYMBOL
PARAMETER
Reference Output Voltage
Reference Output
Temperature Coefficient
Reference Line Regulation
Reference Load Regulation
Short-Circuit Current
Reference Output Voltage Noise at 1kHz
Reference Output Voltage Noise
Density from 0.1Hz to 10Hz
Reference Input
REFHI, REFLO Input Range
(Note 7) See Applications Information
X1/X2 Tied to V
OUT
X1/X2 Tied to GND
LTC1657
LTC1657L (Relative to REFLO)
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ELECTRICAL CHARACTERISTICS
Reference Output (REFOUT)
LTC1657
CONDITIONS
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MIN
2.036
1.240
TYP
2.048
1.250
15
MAX
2.060
1.260
UNITS
V
V
ppm/°C
LTC1657L
LTC1657: V
CC
= 4.5V to 5.5V
LTC1657L: V
CC
= 2.7V to 5.5V
Measured at I
OUT
= 100µA (LTC1657)
Measured at I
OUT
= 100µA (LTC1657L)
REFOUT Shorted to GND
LTC1657
LTC1657L
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±1.5
±1.0
5
3
50
150
90
6
100
mV/V
mV/V
mV/A
mV/A
mA
nV/√Hz
nV/√Hz
µV
P-P
0
0
16
16
25
23
V
CC
– 1.5
V
CC
/2
V
V
kΩ
kΩ
REFHI Input Resistance
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1657lfa
For more information
www.linear.com/LTC1657
LTC1657/LTC1657L
The
l
denotes the specifications which apply over the full operating
temperature range T
A
= T
MIN
to T
MAX
, V
CC
= 5V (LTC1657), V
CC
= 3V (LTC1657L), unless otherwise noted.
LTC1657
SYMBOL
Digital I/O
V
IH
V
IL
I
LEAK
C
IN
t
CS
t
WR
t
CWS
t
CWH
t
DWS
t
DWH
t
LDAC
t
CLR
Digital Input High Voltage
Digital Input Low Voltage
Digital Input Leakage
Digital Input Capacitance
CS
(MSB or LSB) Pulse Width
WR
Pulse Width
CS
to
WR
Setup
CS
to
WR
Hold
Data Valid to
WR
Setup
Data Valid to
WR
Hold
LDAC
Pulse Width
CLR
Pulse Width
V
IN
= GND to V
CC
(Note 7)
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ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
LTC1657L
MAX
MIN
2.0
0.8
±10
10
0.6
±10
10
60
60
0
0
60
0
60
60
TYP
MAX
UNITS
V
V
µA
pF
ns
ns
ns
ns
ns
ns
ns
ns
MIN
2.4
TYP
Switching Characteristics
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40
40
0
0
40
0
40
40
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
External reference REFHI = 2.2V. V
CC
= 5V (LTC1657).
External reference REFHI = 1.3V. V
CC
= 3V (LTC1657L).
Note 3:
Nonlinearity is defined from code 128 to code 65535 (full scale).
See Applications Information.
Note 4:
Digital inputs at 0V or V
CC
.
Note 5:
DAC switched between all 1s and all 0s. V
FS
= 4.096V.
Note 6:
D0 to D15 toggle between all 0s and all 1s with REFHI = 0V,
CSMSB
=
CSLSB
=
WR
=
LDAC
=
High
Note 7:
Guaranteed by design. Not subject to test.
Note 8:
DAC inputs all 1s.
Note 9:
X1/X2 tied to GND, the voltage noise will be a factor of 2 greater.
Note 10:
Using 2.048V (1.25V) external reference with 3nV/√Hz noise at
1kHz for LTC1657/(LTC1657L).
1657lfa
For more information
www.linear.com/LTC1657
5
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