Linear LTC1588CG, LTC1588IG, LTC1589CG, LTC1589IG, LTC1592ACG Schematics

with Programmable Output Range

FEATURES

■

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

U

APPLICATIO S

■

Process Control and Industrial Automation

■

Precision Instrumentation

■

Direct Digital Waveform Generation

■

Software-Controlled Gain Adjustment

■

Automatic Test Equipment

LTC1588/LTC1589/LTC1592

12-/14-/16-Bit SoftSpan DACs

U

DESCRIPTIO

The LTC®1588/LTC1589/LTC1592 are serial input 12-/14­/16-bit multiplying current output DACs that operates
from a single 5V supply. These SoftSpanTM 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.

TYPICAL APPLICATIO

Programmable Output Range 16-Bit SoftSpan DAC

V

REF

5V

5

+

1/2 LT®1469

6

–

1

2

R

R1

9

5V

0.1µF

V

CC

14

CLR

13

CS/LD

12

SCK

11

SDI

10

SDO

COM

R1

16-BIT DAC WITH SPAN ADJUST

C2

150pF

R2

7

LTC1592

U

LTC1592 Integral Nonlinearity

1.0
V

= 5V

REF

0.8

ALL OUTPUT RANGES

0.6

0.4

3

15

16

R2

REF

4

R

R

FB

OFS

I

OUT1

I

OUT2

AGND

GND

1588992 TA01

C1
15pF

5

2

3

6
7
8

15V

8

–

1/2 LT1469

+

4

–15V

0.1µF

0.1µF

1

V

OUT

0.2

0
–0.2
–0.4
–0.6

INTEGRAL NONLINEARITY (LSB)

–0.8
–1.0

0

32768

16384

DIGITAL INPUT CODE

49152

65535

1588992 TA02

1588992fa

1

LTC1588/LTC1589/LTC1592

PACKAGE/ORDER I FOR ATIO

UU

W

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

VCC to AGND, GND ......................................–0.3V to 7V

AGND to GND .............................. –0.3V to (VCC + 0.3V)

GND to AGND .............................. –0.3V to (VCC + 0.3V)

R

to AGND, GND ................................ –0.3V to 12V

COM

REF to AGND, GND ................................................ ±15V

R

, RFB, R1, R2 to AGND, GND .......................... ±15V

OFS

Digital Inputs to AGND, GND ....... –0.3V to (VCC + 0.3V)

I

, I

OUT1

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

to AGND, GND.......... –0.3V to (VCC + 0.3V)

OUT2

ORDER PART

TOP VIEW

1

R

COM

2

R1

3

R

OFS

4

R

FB

5

I

OUT1

6

I

OUT2

7

AGND

8

GND

G PACKAGE

16-LEAD PLASTIC SSOP

T

= 150°C, θJA = 125°C/ W

JMAX

Consult LTC Marketing for parts specified with wider operating temperature ranges.

16

R2

15

REF

14

CLR

13

CS/LD

12

SCK

11

SDI

10

SDO

9

V

CC

NUMBER

LTC1588CG
LTC1588IG
LTC1589CG
LTC1589IG
LTC1592ACG
LTC1592AIG
LTC1592BCG
LTC1592BIG

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = T
VCC = 5V, V

SYMBOL PARAMETER CONDITIONS TEMPERATURE MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
Accuracy

INL Integral (Notes 2, 3) TA = 25°C ±1 ±1 ±2 ±0.3 ±1LSB

DNL Differential Guaranteed T

GE Gain Error All Output Ranges TA = 25°C –0.20 ±3 –1.0 ±4–3±16 –2 ±16 LSB

BZE Bipolar Zero Error All Bipolar Ranges TA = 25°C ±1 ±2.5 ±10 ±5LSB

I

LKG

PSRR Power Supply VCC = 5V ±10% ● ±0.01±0.15 ±0.05 ±0.5 ±2 ±0.2 ±2 LSB/V

= 5V, I

REF

Resolution ● 12 14 16 16 Bits

Nonlinearity T

Nonlinearity Monotonic (Note 3)

Gain Temperature ∆Gain/∆Temperature ● 3 3 3 1 3 ppm/°C
Coefficient (Note 4)

I

Leakage (Note 5) TA = 25°C ±5 ±5 ±5 ±5nA

OUT1

Current T

Rejection

= AGND = GND = 0V.

OUT2

(Note 3) T

(Note 3) T

MIN

MIN

MIN

MIN

MIN

to T
to T

to T

to T

to T

MAX

MAX

MAX

MAX

MAX

LTC1588 LTC1589 LTC1592B LTC1592A

● ±1 ±1 ±2 ±0.4 ±1LSB

● ±1 ±1 ±1 ±0.2 ±1LSB

● –0.22 ±3 –1.3 ±6–4±24 –3 ±16 LSB

● ±1 ±4.0 ±16 ±8LSB

● ±15 ±15 ±15 ±15 nA

MIN

to T

MAX

,

2

1588992fa

LTC1588/LTC1589/LTC1592

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are TA = T

The ● denotes specifications which apply over the full operating

MIN

to T

, VCC = 5V, V

MAX

REF

= 5V, I

= AGND = GND = 0V.

OUT2

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Input

R

REF

DAC Input Resistance (Unipolar) (Note 6) ● 5710 kΩ

R1, R2 R1, R2 Resistance (Notes 6, 11) ● 10 14 20 kΩ
R

OFS

R

FB

Offset Resistance (Bipolar) ±5V, ±10V, ±2.5V Ranges ● 10 14 20 kΩ

–2.5V to 7.5V Range

● 20 28 40 kΩ

Feedback Resistance (Unipolar) 5V Range ● 5710 kΩ

10V Range

● 10 14 20 kΩ

Feedback Resistance (Bipolar) ±5V and –2.5V to 7.5V Ranges ● 10 14 20 kΩ

±10V Range
±2.5V Range

● 20 28 40 kΩ

● 5710 kΩ

Analog Outputs (Note 4)

C

OUT

Output Capacitance (I

) DAC Load All 1s 160 pF

OUT1

DAC Load All 0s 100 pF

AC Performance (Note 4)

Settling Time 5V Range, 0V to 5V Step with LT1468 (Note 7) 2 µs
Midscale Glitch Impulse (Note 10) 2 nV-s
Multiplying Feedthrough Error V

= ±10V, 10kHz Sine Wave 1 mV

REF

P-P

THD Total Harmonic Distortion (Note 8) Multiplying –108 dB

Output Noise Voltage Density (Note 9) At I

OUT1

11 nV/√Hz

Digital Inputs

V

IH

V

IL

I

IN

C

IN

Digital Input High Voltage ● 2.4 V
Digital Input Low Voltage ● 0.8 V
Digital Input Current ● ±1 µA
Digital Input Capacitance VIN = 0V (Note 4) ● 8pF

Digital Outputs

V

OH

V

OL

Digital Output High Voltage IOH = 200µA ● 4V
Digital Output Low Voltage IOL = 1.6mA ● 0.4 V

Timing Characteristics

t

1

t

2

t

3

t

4

t

5

t

6

t

7

t

8

t

9

t

10

t

11

Serial Input Valid to SCK Setup Time ● 60 ns
Serial Input Valid to SCK Hold Time ● 0ns
SCK Pulse Width High ● 35 ns
SCK Pulse Width Low ● 35 ns
CS/LD Pulse High Width ● 360 ns
LSB SCK High to CS/LD High ● 35 ns
CS/LD Low to SCK High ● 0ns
SCK to SDO Propagation Delay C

= 50pF ● 20 180 ns

LOAD

SCK Low to CS/LD Low ● 35 ns
Clear Pulse Low Width ● 100 ns
CS/LD High to SCK Positive Edge ● 35 ns
SCK Frequency Non-Daisy Chain (Note 12) ● 14.2 MHz

Daisy Chain (Note 13) 4.1 MHz

1588992fa

3

LTC1588/LTC1589/LTC1592

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are TA = T

The ● denotes specifications which apply over the full operating

MIN

to T

, VCC = 5V, V

MAX

REF

= 5V, I

= AGND = GND = 0V.

OUT2

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply

V

CC

I

CC

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
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

Supply Voltage ● 4.5 5 5.5 V
Supply Current, V

CC

Digital Inputs = 0V or V

CC

● 10 µA

Note 9: Calculation from en = √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

, R2 and R

COM

COM

Note 12: If a continuous clock is used with data changing on the rising

, t2) will limit the maximum clock

1

with DAC register loaded to all 0s.

OUT1

edge of SCK, setup and hold time (t
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).

, t1) limit the

8

at 1kHz. DAC register loaded with all 1s. Output

RMS

Note 13: SDO propagation delay and SDI setup time (t
maximum clock frequency for daisy chaining.

.

amplifier = LT1468.

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Midscale Glitch Impulse

40

USING AN LT1468

= 30pF

C

FEEDBACK

30

V

= 10V

REF

20

10

0

–10

OUTPUT VOLTAGE (mV)

–20

–30

–40

0

1nV-s TYPICAL

0.2 0.4 0.8

TIME (µs)

0.6

1.0

1588992 G03

Supply Current vs Input Voltage

5

VCC = 5V
ALL DIGITAL INPUTS
TIED TOGETHER

4

3

2

SUPPLY CURRENT (mA)

1

0

1

0

INPUT VOLTAGE (V)

3

2

4

(LTC1588/LTC1589/LTC1592)

Logic Threshold vs Supply Voltage

3.0

2.5

2.0

1.5

1.0

LOGIC THRESHOLD (V)

0.5

0

1588992 G09

5

0

234

1

SUPPLY VOLTAGE (V)

576

1588992 G10

4

1588992fa

LTC1588/LTC1589/LTC1592

UW

TYPICAL PERFOR A CE CHARACTERISTICS

(LTC1588)

Integral Nonlinearity Differential Nonlinearity

(LTC1589)

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6

INTEGRAL NONLINEARITY (LSB)

–0.8
–1.0

800

0

DIGITAL INPUT CODE

2400 3200 4095

1600

1588992 G11

Integral Nonlinearity Differential Nonlinearity

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6

INTEGRAL NONLINEARITY (LSB)

–0.8
–1.0

0

4112

8224 12336 16383

DIGITAL INPUT CODE

1588992 G13

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

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

800

1600

DIGITAL INPUT CODE

4112

8224 12336 16383

DIGITAL INPUT CODE

2400 3200 4095

1588992 G12

1588992 G14

(LTC1592)

Integral Nonlinearity (INL)

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6

INTEGRAL NONLINEARITY (LSB)

–0.8
–1.0

0

16384

DIGITAL INPUT CODE

32768

49152

1588992 G01

65535

Differential Nonlinearity (DNL)

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

DIGITAL INPUT CODE

49152

65535

1588992 G02

Integral Nonlinearity
vs Reference Voltage
in Unipolar Mode

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6

INTEGRAL NONLINEARITY (LSB)

–0.8
–1.0

–6

–4

–8 8

–10

–2

0

REFERENCE VOLTAGE (V)

2

4

6

10

1588992 G05

1588992fa

5

LTC1588/LTC1589/LTC1592

UW

TYPICAL PERFOR A CE CHARACTERISTICS

(LTC1592)

Integral Nonlinearity
vs Reference Voltage
in Bipolar Mode

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6

INTEGRAL NONLINEARITY (LSB)

–0.8
–1.0

–6

–4

–8 8

–10

–2

0

REFERENCE VOLTAGE (V)

Differential Nonlinearity
vs Reference Voltage
in Bipolar Mode

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6

DIFFERENTIAL NONLINEARITY (LSB)

–0.8
–1.0

–6

–4

–8 8

–10

–2

0

REFERENCE VOLTAGE (V)

Differential Nonlinearity
vs Reference Voltage
in Unipolar Mode

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6

DIFFERENTIAL NONLINEARITY (LSB)

–0.8

2

4

6

10

1588992 G06

–1.0

–6

–4

–8 8

–10

–2

REFERENCE VOLTAGE (V)

2

4

6

0

10

1588992 G07

Full-Scale Settling Waveform

LD PULSE

5V/DIV

GATED

SETTLING

WAVEFORM

500µV/DIV

500ns/DIV

USING LT1468 OP AMP

= 20pF

C

2

4

6

10

1588992 G08

FEEDBACK

0V TO 10V STEP

1592 G04

U

UU

PI FU CTIO S

R

(Pin 1): Center Tap Point of the Two Bipolar Resis-

COM

tors R1 and R2. Normally tied to the inverting input of an
external amplifier. When these resistors are not used,
connect this pin to ground. The absolute maximum volt­age range on this pin is –0.3V to 12V.

R1 (Pin 2): Bipolar Resistor R1. The main reference input
V

, typically 5V. Accepts up to ±15V. Normally tied to

REF

R

(Pin 3) and the reference input voltage V

OFS

REF

(5V).

When not used connect this pin to ground.

6

R

(Pin 3): Bipolar Offset Network. This pin provides the

OFS

offset of the output voltage range for bipolar modes.
Accepts up to ±15V. Normally tied to R1 and the reference
input voltage V
driven from a different voltage than V

(5V). Alternatively, this pin may be

REF

.

REF

RFB (Pin 4): Feedback Network. Normally tied to the output
of the current to voltage converter op amp. Range limited
to ±15V.

1588992fa