LTC1650
Low Glitch 16-Bit
Voltage Output DAC
FEATURES
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DESCRIPTIO
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16-Bit Monotonic Over Temperature
Low Glitch Impulse: 2nV-s
Low Noise: 30nV/√Hz
Buffered Rail-to-Rail Voltage Output
Low Power: 50mW from
±5V
Supplies
Unipolar or Bipolar Output (0V to V
REF
or
±V
REF
)
4-Quadrant Multiplying Capability
Asynchronous Clear to User-Defined Voltage
Power-On Reset
Three-Wire SPI and MICROWIRE
TM
Compatible
Serial Interface
Schmitt Trigger On CLK Input Allows Direct
Optocoupler Interface
16-Pin Narrow SO Package
The LTC
®
1650 is a deglitched rail-to-rail voltage output
16-bit digital-to-analog converter (DAC) available in a
16-pin narrow SO package. It has 16-bit monotonicity
over temperature and includes a rail-to-rail output buffer
amplifier and an easy to use three-wire cascadable serial
interface. The LTC1650 operates with dual
±5V
supplies.
With REFLO = 0V and REFHI = V
REF
, the output will swing
from 0V to V
REF
in unipolar mode or
±V
REF
in bipolar
mode.
The LTC1650 has excellent accuracy over its full operating
temperature range along with very low power dissipation
of 50mW with dual
±5V
supplies. This, along with the
small outline package, makes it the most flexible high
resolution digital-to-analog converter available today.
The LTC1650 has a fast settling time of 4µs to 16 bits and
a low midscale glitch of under 2nV-s. This makes the
LTC1650 ideal for waveform generation or other applica-
tions where output dynamic performance is important.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
APPLICATIO S
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Industrial Process Control
Precision Industrial Equipment
Waveform Generation
Automatic Test Equipment
High Resolution Offset and Gain Adjustment
TYPICAL APPLICATIO
5V
3
CS/LD
CLK
D
IN
8
DV
DD
5V
4.096V
11
REFHI
RSTOUT
10
15
AV
DD
7
5
POWER-ON RESET
SUPPLY SENSE
9
2
CLR
V
RST
DNL ERROR (LSB)
16-BIT SHIFT REGISTER
16-BIT DAC REGISTER
16-BIT DAC
+
1
V
OUT
–
D
OUT
6
16
4
12,13
14
– 5V
AV
SS
UNI/BIP
DGND
REFLO
1650 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
CODE
49152
65535
1650 TA02
U
U
1
LTC1650
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
V
OUT
1
V
RST
2
DV
DD
3
DGND 4
D
IN
5
D
OUT
6
CLK 7
CS/LD 8
N PACKAGE
16-LEAD PDIP
16 UNI/BIP
15 AV
DD
14 AV
SS
13 REFLO S
12 REFLO F
11 REFHI
10 RSTOUT
9
CLR
AV
DD
, DV
DD
to DGND .............................. – 0.5V to 7.5V
TTL Input Voltage .................................... – 0.5V to 7.5V
V
OUT
, V
RST
................................ – 0.5V to (AV
DD
+ 0.5V)
AV
SS
.........................................................0.5V to – 7.5V
Operating Temperature Range
LTC1650C............................................... 0°C to 70°C
LTC1650I ............................................ – 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
ORDER PART
NUMBER
LTC1650ACN
LTC1650AIN
LTC1650ACS
LTC1650AIS
LTC1650CN
LTC1650IN
LTC1650CS
LTC1650IS
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 85°C/ W (N)
T
JMAX
= 125°C,
θ
JA
= 130°C/ W (S)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
AV
DD
= 4.75V to 5.25V, AV
SS
= – 4.75V to – 5.25V, DV
DD
= 4.75V to 5.25V, REFLO = 0V, REFHI = 4.096V, V
OUT
unloaded,
T
A
= T
MIN
to T
MAX
unless otherwise noted.
LTC1650CS/CN
LTC1650IS/IN
MIN
TYP
MAX
q
q
SYMBOL
PARAMETER
Resolution
Monotonicity
CONDITIONS
LTC1650ACS/ACN
LTC1650AIS/AIN
MIN
TYP
MAX
16
16
UNITS
Bits
Bits
DAC Characteristics, Unipolar/Bipolar Output Unless Otherwise Noted
16
16
±0.15
±4
±5
q
q
DNL
INL
Differential Nonlinearity
Integral Nonlinearity
Bipolar Zero Error
Bipolar Zero Error
Guaranteed Monotonic (Note 2)
Integral Nonlinearity (Note 2)
T
A
= 25°C
T
A
= T
MIN
to T
MAX
T
A
= T
MIN
to T
MAX
q
q
±0.9
±16
±12
±18
±12
±0.15
±4
±5
±0.5
±0.5
±0.5
±8
±12
±18
±12
V
OS
V
OS
TC
Unipolar Offset Error
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Bipolar Negative
Full-Scale Error
Bipolar Negative
Full-Scale Error Tempco
±0.5
±0.5
µV/°C
±12
LSB
ppm/°C
±12
LSB
ppm/°C
T
A
= T
MIN
to T
MAX
q
±4
±0.5
±18
±4
±0.5
T
A
= T
MIN
to T
MAX
See Definitions Section
See Definitions Section
q
±1
±0.75
±16
±1
±0.75
2
U
W
U
U
W W
W
LSB
LSB
LSB
LSB
LSB
LTC1650
ELECTRICAL CHARACTERISTICS
AV
DD
= 4.75V to 5.25V, AV
SS
= – 4.75V to – 5.25V, DV
DD
= 4.75V to 5.25V, REFLO = 0V, REFHI = 4.096V, V
OUT
unloaded,
T
A
= T
MIN
to T
MAX
unless otherwise noted.
SYMBOL
AV
DD
DV
DD
AV
SS
I
AVDD
I
AVSS
I
DVDD
PSRR
PARAMETER
Positive Supply Voltage
Positive Supply Voltage
Negative Supply Voltage
AV
DD
Supply Current
AV
SS
Supply Current
DV
DD
Supply Current
AV
DD
, DV
DD
Supply Rejection
AV
SS
Supply Rejection
Reference Input
R
IN
Reference Input Resistance
REFHI Range
REFLO Range
Op Amp DC Performance
Short-Circuit Current Low
Short-Circuit Current High
Output Impedance
DAC Output Range
AC Performance
Voltage Output Slew Rate
Voltage Output Settling Time
Midscale Glitch Impulse
Digital Feedthrough
Output Noise Voltage Density
SINAD
Signal-to-Noise + Distortion Ratio
1kHz to 100kHz (Note 6)
REFHI = 1kHz 4V
P-P
Unloaded (Note 4)
q
q
q
q
CONDITIONS
q
q
q
MIN
4.75
4.75
– 4.75
– 7.5
TYP
5.0
5.0
– 5.0
5
–5
0.1
0.5
0.5
MAX
5.25
5.25
– 5.25
7.5
0.25
1.5
1.5
7.5
4.5
1.0
50
50
UNITS
V
V
V
mA
mA
mA
LSB/V
LSB/V
kΩ
V
V
mA
mA
Ω
V
V
V/µs
µs
nV-s
nV-s
nV/√Hz
dB
Power Supply Characteristics
4.75V
≤
AV
DD
≤
5.25V (Note 5)
– 5.25V
≤
AV
SS
≤
– 4.75V (Note 5)
4.75V
≤
DV
DD
≤
5.25V (Note 5)
4.75V
≤
AV
DD
, DV
DD
≤
5.25V
– 5.25V
≤
AV
SS
≤
– 4.75V
q
q
q
q
q
2.5
– 4.0
– 1.0
5
4.0
0
25
25
0.15
0V to V
REF
±V
REF
V
OUT
Shorted to GND
V
OUT
Shorted to V
CC
Measured at Midscale
Unipolar Mode (Note 9)
Bipolar Mode (Note 9)
q
q
0.8
2.0
4
1.8
0.05
30
96
3
LTC1650
ELECTRICAL CHARACTERISTICS
AV
DD
= 4.75V to 5.25V, AV
SS
= – 4.75V to – 5.25V, DV
DD
= 4.75V to 5.25V, REFLO = 0V, REFHI = 4.096V, V
OUT
unloaded,
T
A
= T
MIN
to T
MAX
unless otherwise noted.
SYMBOL
V
IH
V
IL
V
OH
V
OL
I
LK
C
IN
R
ON
PARAMETER
Digital Input High Voltage
Digital Input Low Voltage
Digital Output High Voltage
Digital Output Low Voltage
Digital Input Leakage
Digital Input Capacitance
V
OUT
and V
RST
Switch Resistance
Threshold Voltage for Reset
Switching Characteristics
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
D
IN
Valid to CLK Setup
D
IN
Valid to CLK Hold
CLK High Time
CLK Low Time
CS/LD Pulse Width
LSB CLK to CS/LD
CS/LD Low to CLK
D
OUT
Output Delay
CLK Low to CS/LD Low
CLR Pulse Width
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
C
LOAD
= 100pF
(Note 3)
q
q
q
q
q
q
q
q
q
q
CONDITIONS
q
q
MIN
2.4
TYP
MAX
UNITS
V
Digital I/O Characteristics
0.8
V
CC
– 1.0
0.4
±10
10
q
q
q
V
V
V
µA
pF
Ω
V
V
ns
ns
ns
ns
ns
ns
ns
I
OUT
= –1mA, D
OUT
Only
I
OUT
= 1mA, D
OUT
Only
V
IN
= GND to V
CC
(Note 3)
V
RST
= 0.5V (Note 7)
AV
DD
or DV
DD
(Note 8)
AV
SS
(Note 8)
q
q
q
Reset Characteristics
200
1.5
1.5
40
0
40
40
50
40
20
5
20
50
45
150
2.5
2.5
500
3.2
3.2
ns
ns
ns
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Nonlinearity is defined from code 0 to code 65535 (full scale)
(end point INL, see Definitions section).
Note 3:
Guaranteed by design. Not subject to test.
Note 4:
To
±1LSB.
Unipolar mode. DAC switched between all 1s and all 0s.
Note 5:
Digital Inputs at 0V or DV
DD
.
Note 6:
Measured at V
OUT
. REFHI = REFLO = 0V, unipolar mode.
Note 7:
When part powers up or when it is reset, the output is connected
to V
RST
through this switch.
Note 8:
Reset is active when any supply goes below this threshold.
Note 9:
REFLO = 0V, REFHI = V
REF
. For REFLO
≠
0V see Operation section.
4
LTC1650
TYPICAL PERFOR A CE CHARACTERISTICS
Integral Nonlinearity (INL) vs
Input Code
5
4
3
DNL ERROR (LSB)
INL ERROR (LSB)
2
1
0
–1
–2
–3
–4
–5
0
16384
32768
CODE
49152
65535
1650 G01
Large Signal Settling Time
CS/LD
5V/DIV
4.096V
V
OUT
1V/DIV
0V
1µs/DIV
Minimum Supply Headroom for
Full Output Swing vs Load Current
1.0
0.9
0.8
0.7
V
CC
– V
OUT
0.6
0.5
0.4
0.3
0.2
0.1
0
0
5.0
10.0
LOAD CURRENT (mA)
15.0
1650 G07
SUPPLY CURRENT (mA)
∆
V
OUT
< 1LSB
V
OUT
= 4.096V
CODE: ALL 1’s
ATTENUATION (dB)
U W
1650 G04
Differential Nonlinearity (DNL) 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
CODE
49152
65535
1650 G02
Large Signal Settling Time
CS/LD
5V/DIV
4.096V
V
OUT
1V/DIV
0V
1µs/DIV
1650 G03
Mid-Scale Glitch
Broadband Noise
CS/LD
5V/DIV
V
OUT
10mV/DIV
50µV/DIV
REFERRED
TO DAC
OUTPUT
BW = 100kHz
200µs/DIV
1650 G06
500ns/DIV
1650 G05
Reference Feedthrough
100
90
80
70
60
50
40
AV
DD
Supply Current vs
Temperature
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
1
100
10k
1M
FREQUENCY (Hz)
100M
1650 G08
4.5
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1650 G09
5
