LTC1588/LTC1589/LTC1592
12-/14-/16-Bit SoftSpan DACs
with Programmable Output Range
FEATURES
s
DESCRIPTIO
s
s
s
s
s
Six Programmable Output Ranges
Unipolar Mode: 0V to 5V, 0V to 10V
Bipolar Mode:
±5V, ±10V, ±2.5V,
– 2.5V to 7.5V
1LSB Max DNL and INL Over the Industrial
Temperature Range
Glitch Impulse < 2nV-s
16-Lead SSOP Package
Power-On Reset to 0V
Asynchronous Clear to 0V for All Ranges
The LTC
®
1588/LTC1589/LTC1592 are serial input 12-/14-
/16-bit multiplying current output DACs that operates
from a single 5V supply. These SoftSpan
TM
DACs can be
software-programmed for either unipolar or bipolar mode
through a 3-wire SPI interface. In either mode, the voltage
output range can also be software-programmed. Two
output ranges in unipolar mode and four output ranges in
bipolar mode are available.
INL and DNL are accurate to 1LSB over the industrial
temperature range in both unipolar and bipolar modes.
True 16-bit 4-quadrant multiplication is achieved with
on-chip four quadrant multiplication resistors. The
LTC1588/LTC1589/LTC1592 are available in a 16-lead
SSOP package.
These devices include an internal deglitcher circuit that
reduces the glitch impulse to less than 2nV-s (typ).
The asynchronous clear pin resets the LTC1588/LTC1589/
LTC1592 to 0V in unipolar or bipolar mode.
, LTC and LT are registered trademarks of Linear Technology Corporation.
SoftSpan is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Process Control and Industrial Automation
Precision Instrumentation
Direct Digital Waveform Generation
Software-Controlled Gain Adjustment
Automatic Test Equipment
TYPICAL APPLICATIO
V
REF
5V
5
Programmable Output Range 16-Bit SoftSpan DAC
LTC1592 Integral Nonlinearity
7
INTEGRAL NONLINEARITY (LSB)
+
1/2 LT
®
1469
6
–
C2
150pF
2
R1
R1
5V
9
0.1µF
14
13
12
11
10
CLR
CS/LD
SCK
SDI
SDO
V
CC
1
R
COM
R2
16 15
3
4
C1
15pF
15V
8
0.1µF
R2 REF R
OFS
R
FB
16-BIT DAC WITH SPAN ADJUST
I
OUT2
6
AGND
LTC1592
GND
7
8
3
1588992 TA01
+
–
I
OUT1
5
2
1/2 LT1469
4
–15V
1
V
OUT
0.1µF
U
1.0
V
REF
= 5V
0.8 ALL OUTPUT RANGES
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
49152
32768
16384
DIGITAL INPUT CODE
65535
1588992 TA02
U
U
1588992fa
1
LTC1588/LTC1589/LTC1592
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
R
COM
R1
R
OFS
R
FB
I
OUT1
I
OUT2
AGND
GND
1
2
3
4
5
6
7
8
G PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 125°C/ W
16 R2
15 REF
14 CLR
13 CS/LD
12 SCK
11 SDI
10 SDO
9
V
CC
V
CC
to AGND, GND ......................................– 0.3V to 7V
AGND to GND .............................. – 0.3V to (V
CC
+ 0.3V)
GND to AGND .............................. – 0.3V to (V
CC
+ 0.3V)
R
COM
to AGND, GND ................................ – 0.3V to 12V
REF to AGND, GND ................................................
±15V
R
OFS
, R
FB
, R1, R2 to AGND, GND ..........................
±15V
Digital Inputs to AGND, GND ....... – 0.3V to (V
CC
+ 0.3V)
I
OUT1
, I
OUT2
to AGND, GND .......... – 0.3V to (V
CC
+ 0.3V)
Maximum Junction Temperature .......................... 150°C
Operating Temperature Range
LTC1588C/LTC1589C/LTC1592C ........... 0°C to 70°C
LTC1588I/LTC1589I/LTC1592I ........... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC1588CG
LTC1588IG
LTC1589CG
LTC1589IG
LTC1592ACG
LTC1592AIG
LTC1592BCG
LTC1592BIG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= T
MIN
to T
MAX
,
V
CC
= 5V, V
REF
= 5V, I
OUT2
= AGND = GND = 0V.
SYMBOL PARAMETER
Accuracy
Resolution
INL
DNL
GE
BZE
Integral
Nonlinearity
Differential
Nonlinearity
Gain Error
(Notes 2, 3)
Guaranteed
Monotonic (Note 3)
All Output Ranges
(Note 3)
T
A
= 25°C
T
MIN
to T
MAX
T
MIN
to T
MAX
T
A
= 25°C
T
MIN
to T
MAX
T
A
= 25°C
T
MIN
to T
MAX
q
q
q
CONDITIONS
TEMPERATURE
LTC1588
LTC1589
LTC1592B
LTC1592A
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
12
±1
±1
±1
–0.20
±3
–0.22
±3
±1
±1
3
±5
±15
±0.01±0.15
14
±1
±1
±1
–1.0
±4
–1.3
±6
±2.5
±4.0
3
±5
±15
±0.05 ±0.5
16
±2
±2
±1
–3
±16
–4
±24
±10
±16
3
±5
±15
±2
1
16
±0.3 ±1
±0.4 ±1
±0.2 ±1
–2
±16
–3
±16
±5
±8
3
±5
±15
±0.2 ±2
UNITS
Bits
LSB
LSB
LSB
LSB
LSB
LSB
LSB
ppm/°C
nA
nA
LSB/V
q
q
q
Bipolar Zero Error All Bipolar Ranges
(Note 3)
Gain Temperature
∆Gain/∆Temperature
Coefficient
(Note 4)
I
LKG
PSRR
I
OUT1
Leakage
Current
Power Supply
Rejection
(Note 5)
V
CC
= 5V
±10%
T
A
= 25°C
T
MIN
to T
MAX
q
q
1588992fa
2
U
W
U
U
W W
W
LTC1588/LTC1589/LTC1592
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Reference Input
R
REF
R1, R2
R
OFS
R
FB
DAC Input Resistance (Unipolar)
R1, R2 Resistance
Offset Resistance (Bipolar)
Feedback Resistance (Unipolar)
Feedback Resistance (Bipolar)
(Note 6)
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= T
MIN
to T
MAX
, V
CC
= 5V, V
REF
= 5V, I
OUT2
= AGND = GND = 0V.
CONDITIONS
q
q
q
q
q
q
q
q
q
MIN
5
10
10
20
5
10
10
20
5
TYP
7
14
14
28
7
14
14
28
7
160
100
2
2
1
– 108
11
MAX
10
20
20
40
10
20
20
40
10
UNITS
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
pF
pF
µs
nV-s
mV
P-P
dB
nV/√Hz
V
(Notes 6, 11)
±5V, ±10V, ±2.5V
Ranges
–2.5V to 7.5V Range
5V Range
10V Range
±5V
and –2.5V to 7.5V Ranges
±10V
Range
±2.5V
Range
DAC Load All 1s
DAC Load All 0s
5V Range, 0V to 5V Step with LT1468 (Note 7)
(Note 10)
V
REF
=
±10V,
10kHz Sine Wave
(Note 8) Multiplying
(Note 9) At I
OUT1
Analog Outputs (Note 4)
C
OUT
Output Capacitance (I
OUT1
)
AC Performance (Note 4)
Settling Time
Midscale Glitch Impulse
Multiplying Feedthrough Error
THD
Total Harmonic Distortion
Output Noise Voltage Density
Digital Inputs
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
Digital Input High Voltage
Digital Input Low Voltage
Digital Input Current
Digital Input Capacitance
Digital Output High Voltage
Digital Output Low Voltage
Serial Input Valid to SCK Setup Time
Serial Input Valid to SCK Hold Time
SCK Pulse Width High
SCK Pulse Width Low
CS/LD Pulse High Width
LSB SCK High to CS/LD High
CS/LD Low to SCK High
SCK to SDO Propagation Delay
SCK Low to CS/LD Low
Clear Pulse Low Width
CS/LD High to SCK Positive Edge
SCK Frequency
Non-Daisy Chain (Note 12)
Daisy Chain (Note 13)
C
LOAD
= 50pF
V
IN
= 0V (Note 4)
I
OH
= 200µA
I
OL
= 1.6mA
q
q
q
q
2.4
0.8
±1
8
4
0.4
60
0
35
35
360
35
0
20
35
100
35
14.2
4.1
180
V
µA
pF
V
V
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
MHz
Digital Outputs
q
q
Timing Characteristics
q
q
q
q
q
q
q
q
q
q
q
q
1588992fa
3
LTC1588/LTC1589/LTC1592
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Power Supply
V
CC
I
CC
Supply Voltage
Supply Current, V
CC
CONDITIONS
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= T
MIN
to T
MAX
, V
CC
= 5V, V
REF
= 5V, I
OUT2
= AGND = GND = 0V.
MIN
q
TYP
5
MAX
5.5
10
UNITS
V
µA
4.5
Digital Inputs = 0V or V
CC
q
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
±1LSB
=
±0.0015%
of full scale =
±15.3ppm
of full scale
(LTC1592).
±1LSB
=
±0.006%
of full scale =
±61.2ppm
of full scale
(LTC1589).
±1LSB
= 0.024% of full scale =
±244.8ppm
of full scale
(LTC1588).
Note 3:
Using internal feedback resistor.
Note 4:
Guaranteed by design, not subject to test.
Note 5:
I
OUT1
with DAC register loaded to all 0s.
Note 6:
Typical temperature coefficient is 100ppm/°C.
Note 7:
To 0.0015% for a full-scale change, measured from the falling
edge of LD for the LTC1592 only.
Note 8:
REF = 6V
RMS
at 1kHz. DAC register loaded with all 1s. Output
amplifier = LT1468.
Note 9:
Calculation from e
n
=
√4kTRB
where: k = Boltzmann constant
(1.38E-23 J/°K); R = resistance (Ω); T = temperature (°K); B = bandwidth
(Hz).
Note 10:
Midscale transition code: 32767 to 32768 for the LTC1592, 8191
to 8192 for the LTC1589, 2047 to 2048 for the LTC1588.
Note 11:
R1 and R2 are measured between R1 and R
COM
, R2 and R
COM
.
Note 12:
If a continuous clock is used with data changing on the rising
edge of SCK, setup and hold time (t
1
, t
2
) will limit the maximum clock
frequency. If data changes on the falling edge of SCK then the setup time
will limit the maximum clock frequency to 8MHz (continuous 50% duty
cycle clock).
Note 13:
SDO propagation delay and SDI setup time (t
8
, t
1
) limit the
maximum clock frequency for daisy chaining.
TYPICAL PERFOR A CE CHARACTERISTICS
(LTC1588/LTC1589/LTC1592)
Midscale Glitch Impulse
40
30
USING AN LT1468
C
FEEDBACK
= 30pF
V
REF
= 10V
SUPPLY CURRENT (mA)
OUTPUT VOLTAGE (mV)
LOGIC THRESHOLD (V)
20
10
0
–10
–20
– 30
– 40
1nV-s TYPICAL
0
0.2
0.4
0.6
TIME (µs)
4
U W
0.8
1588992 G03
Supply Current vs Input Voltage
5
Logic Threshold vs Supply Voltage
3.0
4
V
CC
= 5V
ALL DIGITAL INPUTS
TIED TOGETHER
2.5
2.0
1.5
1.0
0.5
0
3
2
1
0
1.0
0
1
3
2
INPUT VOLTAGE (V)
4
5
1588992 G09
0
1
5
2
3
4
SUPPLY VOLTAGE (V)
6
7
1588992 G10
1588992fa
LTC1588/LTC1589/LTC1592
TYPICAL PERFOR A CE CHARACTERISTICS
(LTC1588)
Integral Nonlinearity
1.0
1.0
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
800
2400
3200
1600
DIGITAL INPUT CODE
4095
DIFFERENTIAL NONLINEARITY (LSB)
0.8
INTEGRAL NONLINEARITY (LSB)
(LTC1589)
Integral Nonlinearity
1.0
1.0
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
8224
12336
4112
DIGITAL INPUT CODE
16383
1588992 G13
DIFFERENTIAL NONLINEARITY (LSB)
0.8
INTEGRAL NONLINEARITY (LSB)
(LTC1592)
Integral Nonlinearity (INL)
1.0
DIFFERENTIAL NONLINEARITY (LSB)
0.8
INTEGRAL NONLINEARITY (LSB)
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
0
49152
32768
16384
DIGITAL INPUT CODE
65535
1588992 G01
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
0
49152
32768
16384
DIGITAL INPUT CODE
65535
1588992 G02
INTEGRAL NONLINEARITY (LSB)
U W
Differential Nonlinearity
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
800
2400
3200
1600
DIGITAL INPUT CODE
4095
1588992 G11
1588992 G12
Differential Nonlinearity
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
8224
12336
4112
DIGITAL INPUT CODE
16383
1588992 G14
Differential Nonlinearity (DNL)
1.0
0.8
1.0
0.8
0.6
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
Integral Nonlinearity
vs Reference Voltage
in Unipolar Mode
–1.0
–10 – 8 – 6 – 4 – 2 0 2 4 6
REFERENCE VOLTAGE (V)
8
10
1588992 G05
1588992fa
5
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