LINEAR TECHNOLOGY LTC1657, LTC1657L Technical data
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FEATURES
LTC1657/LTC1657L
Parallel 16-Bit Rail-to-Rail
Micropower DAC
U
DESCRIPTIO
■
16-Bit Monotonic Over Temperature
■
Deglitched Rail-to-Rail Voltage Output: 8nV•s
■
ICC: 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
U
APPLICATIO S
■
Instrumentation
■
Digital Calibration
■
Industrial Process Control
■
Automatic Test Equipment
■
Communication Test Equipment
The LTC®1657/LTC1657L are complete single supply, railto-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 fullscale 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
D15 (MSB)
19
18
17
16
15
14
13
FROM
12
11
10
28
27
9
8
7
6
5
4
3
1
2
D8
D7
D0 (LSB)
CSMSB
WR
CSLSB
LDAC
CLR
DATA IN FROM
MICROPROCESSOR
DATA BUS
MICROPROCESSOR
DECODE LOGIC
FROM
SYSTEM RESET
W
MSB
8-BIT
INPUT
REGISTER
LSB
8-BIT
INPUT
REGISTER
POWER-ON
RESET
16-BIT
DAC
REGISTER
REFERENCE
LTC1657: 2.048V
LTC1657L: 1.25V
16-BIT
DAC
LTC1657: 4.5V TO 5.5V
LTC1657L: 2.7V TO 5.5V
22 2423
REFHIREFOUT
R
REFLOGND
X1/X2
2120 26
V
CC
+
–
R
V
OUT
1657 TA01
LTC1657:
25
0V TO 4.096V
LTC1657L:
0V TO 2.5V
Differential Nonlinearity
vs Input Code
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
DIFFERENTIAL NONLINEARITY (LSB)
–0.8
–1.0
0 16384 32768 49152 65535
DIGITAL INPUT CODE
1657 TA02
1
LTC1657/LTC1657L
PACKAGE/ORDER I FOR ATIO
UU
W
WWWU
ABSOLUTE AXI U RATI GS
(Note 1)
VCC to GND .............................................. –0.5V to 7.5V
TTL Input Voltage, REFHI, REFLO,
X1/X2....................................................... –0.5V to 7.5V
V
, REFOUT ............................ –0.5V to (VCC + 0.5V)
OUT
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
WR
CSLSB
CSMSB
(LSB) D0
D10
TOP VIEW
1
2
3
4
5
D1
6
D2
7
D3
8
D4
9
D5
10
D6
11
D7
12
D8
13
D9
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
LDAC
CLR
X1/X2
V
OUT
V
CC
REFOUT
REFHI
REFLO
GND
D15 (MSB)
D14
D13
D12
D11
ORDER PART
NUMBER
LTC1657CGN
LTC1657CN
LTC1657IGN
LTC1657IN
LTC1657LCGN
LTC1657LCN
LTC1657LIGN
LTC1657LIN
GN PACKAGE
28-LEAD PLASTIC SSOP
ELECTRICAL CHARACTERISTICS
N PACKAGE
28-LEAD PDIP
T
= 125°C, θJA = 95°C/ W (GN)
JMAX
T
= 125°C, θJA = 58°C/ W (N)
JMAX
Consult factory for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V (LTC1657), VCC = 2.7V to 5.5V (LTC1657L),
V
unloaded, REFOUT tied to REFHI, REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted.
OUT
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DAC (Note 2)
Resolution ● 16 Bits
Monotonicity ● 16 Bits
DNL Differential Nonlinearity Guaranteed Monotonic (Note 3) ● ±0.5 ±1 LSB
INL Integral Nonlinearity (Note 3) ● ±4 ±12 LSB
ZSE Zero Scale Error ● 02mV
V
OS
VOSTC Offset Error Tempco ±5 µV/°C
Power Supply
V
CC
I
CC
Offset Error Measured at Code 200 (LTC1657) ● ±0.3 ±3mV
Measured at Code 200 (LTC1657L)
Gain Error ● ±2 ±16 LSB
Gain Error Drift LTC1657 0.5 ppm/°C
LTC1657L 1.0 ppm/°C
Positive Supply Voltage For Specified Performance (LTC1657) ● 4.5 5.5 V
For Specified Performance (LTC1657L)
Supply Current (Note 4) ● 650 1200 µA
● ±0.4 ±4mV
● 2.7 5.5 V
2
LTC1657/LTC1657L
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V (LTC1657), VCC = 2.7V to 5.5V (LTC1657L),
V
unloaded, REFOUT tied to REFHI, REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted.
OUT
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Op Amp DC Performance
Short-Circuit Current Low V
Short-Circuit Current High V
Output Impedance to GND Input Code = 0 (LTC1657) ● 40 120 Ω
Output Line Regulation Input Code = 65535, LTC1657: VCC = 4.5V to 5.5V ● 4 mV/V
AC Performance
Voltage Output Slew Rate (Note 5) ● ±0.3 ±0.7 V/µs
Voltage Output Settling Time (Note 5) to 0.0015% (16-Bit Settling Time) 20 µs
Digital Feedthrough (Note 6) 0.3 nV•s
Midscale Glitch Impulse DAC Switch Between 8000H and 7FFF
Output Voltage Noise Using X1/X2 Tied to V
Internal Reference at 1kHz LTC1657 165 nV/√Hz
Output Voltage Noise Using X1/X2 Tied to V
External Reference at 1kHz
Output Voltage Noise Density Using X1/X2 Tied to V
Internal Reference from 0.1Hz to 10Hz
Refererence Input Multiplying BW 700 kHz
Reference Output (REFOUT)
Reference Output Voltage LTC1657 ● 2.036 2.048 2.060 V
Reference Output 15 ppm/°C
Temperature Coefficient
Reference Line Regulation LTC1657: VCC = 4.5V to 5.5V ● ±1.5 mV/V
Reference Load Regulation Measured at I
Short-Circuit Current REFOUT Shorted to GND ● 50 100 mA
Reference Output Voltage Noise at 1kHz LTC1657 150 nV/√Hz
Reference Output Voltage Noise Density 6 µV
from 0.1Hz to 10Hz
Reference Input
REFHI, REFLO Input Range (Note 7) See Applications Information
REFHI Input Resistance LTC1657 ● 16 25 kΩ
Shorted to GND ● 70 120 mA
OUT
Shorted to V
OUT
Input Code = 0 (LTC1657L)
Input Code = 65535, LTC1657L: V
(Note 5) to 0.012% (13-Bit Settling Time) 10 µs
LTC1657L 105 nV/√Hz
LTC1657L
LTC1657L: V
Measured at I
LTC1657L 90 nV/√Hz
X1/X2 Tied to V
X1/X2 Tied to GND
LTC1657L (Relative to REFLO)
CC
= 2.7V to 5.5V ● 3 mV/V
CC
H
(Notes 8, 9)
OUT
(Notes 8, 9, 10) 50 nV/√Hz
OUT
(Notes 8, 9) 8 µV
OUT
= 2.7V to 5.5V ● ±1.0 mV/V
CC
= 100µA (LTC1657) ● 5 mV/A
OUT
= 100µA (LTC1657L) ● 3 mV/A
OUT
OUT
● 80 140 mA
● 120 275 Ω
8nV•s
P-P
● 1.240 1.250 1.260 V
P-P
● 0V
● 0V
● 16 23 kΩ
– 1.5 V
CC
/2 V
CC
3
LTC1657/LTC1657L
ELECTRICAL CHARACTERISTICS
temperature range TA = T
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Digital I/O
V
IH
V
IL
I
LEAK
C
IN
Switching Characteristics
t
CS
t
WR
t
CWS
t
CWH
t
DWS
t
DWH
t
LDAC
t
CLR
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: External reference REFHI = 2.2V. V
Note 3: Nonlinearity is defined from code 128 to code 65535 (full scale).
See Applications Information.
Note 4: Digital inputs at 0V or V
Note 5: DAC switched between all 1s and all 0s. V
Digital Input High Voltage ● 2.4 2.0 V
Digital Input Low Voltage ● 0.8 0.6 V
Digital Input Leakage VIN = GND to V
Digital Input Capacitance (Note 7) ● 10 10 pF
CS (MSB or LSB) Pulse Width ● 40 60 ns
WR Pulse Width ● 40 60 ns
CS to WR Setup ● 00ns
CS to WR Hold ● 00ns
Data Valid to WR Setup ● 40 60 ns
Data Valid to WR Hold ● 00ns
LDAC Pulse Width ● 40 60 ns
CLR Pulse Width ● 40 60 ns
External reference REFHI = 1.3V. V
MIN
to T
CC
. VCC = 5V (LTC1657), VCC = 3V (LTC1657L), unless otherwise noted.
MAX
= 5V (LTC1657).
CC
= 3V (LTC1657L).
CC
.
= 4.096V.
FS
The ● denotes specifications which apply over the full operating
LTC1657 LTC1657L
CC
● ±10 ±10 µA
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).
4
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1657/LTC1657L
LTC1657 Differential Nonlinearity
2.0
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
DIFFERENTIAL NONLINEARITY (LSB)
–1.6
–2.0
0 16384 32768 49152 65535
5
4
3
2
1
0
–1
–2
–3
INTEGRAL NONLINEARITY (LSB)
–4
–5
0
DIGITAL INPUT CODE
16384
32768
DIGITAL INPUT CODE
49152
1657 G01
65535
1657 G04
LTC1657L Differential Nonlinearity
2.0
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
DIFFERENTIAL NONLINEARITY (LSB)
–1.6
–2.0
16384
0
32768
DIGITAL INPUT CODE
49152
65535
1657 G02
LTC1657 Minimum Supply
Headroom for Full Output Swing
vs Load CurrentLTC1657L Integral Nonlinearity
2.0
CODE ALL 1s
(V)
OUT
– V
CC
V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
≤ 1LSB
∆V
OUT
= 4.096V
V
OUT
125°C
25°C
–55°C
0
0510
LOAD CURRENT (mA)
1657 G05
LTC1657 Integral Nonlinearity
5
4
3
2
1
0
–1
–2
–3
INTEGRAL NONLINEARITY (LSB)
–4
–5
0 16384 32768 49152 65535
DIGITAL INPUT CODE
1657 G03
LTC1657L Minimum Supply
Headroom for Full Output Swing
vs Load Current
2.0
CODE ALL 1s
(V)
OUT
– V
CC
V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
≤ 1LSB
∆V
OUT
= 2.5V
V
OUT
125°C
25°C
–55°C
0510
LOAD CURRENT (mA)
1657 G06
LTC1657 Minimum Output
Voltage vs Output Sink Current
1.2
CODE ALL 0s
≤ 1LSB
∆V
OUT
1.0
0.8
0.6
0.4
0.2
OUTPUT PULL-DOWN VOLTAGE (V)
0
0
51015
OUTPUT SINK CURRENT (mA)
125°C
25°C
–55°C
1657 G07
LTC1657L Minimum Output
Voltage vs Output Sink Current
0.6
125°C 25°C –55°C
0.4
0.2
OUTPUT PULL-DOWN VOLTAGE (V)
0
0
51015
OUTPUT SINK CURRENT (mA)
CODE ALL 0s
≤ 1LSB
∆V
OUT
1657 G08
LTC1657 Full-Scale Voltage
vs Temperature
4.110
4.105
4.100
4.095
4.090
FULL-SCALE VOLTAGE (V)
4.085
4.080
–55 –25 5 35 65 95 125
TEMPERATURE (°C)
1657 G09
5
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