Datasheet

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LTC1650

Low Glitch 16-Bit

Voltage Output DAC

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.

–

16-BIT

DAC

16-BIT DAC REGISTER

16-BIT SHIFT REGISTER

POWER-ON RESET

SUPPLY SENSE

CLR

RST

RSTOUT

OUT

UNI/BIP

REFLODGND

1650 TA01

12,13

4.096V5V

–5V

CS/LD

CLK

OUT

REFHI

CODE

–1.0

DNL ERROR (LSB)

–0.8

–0.4

–0.2

1.0

0.4

16384

32768

1650 TA02

–0.6

0.6

0.8

0.2

49152

65535

Differential Nonlinearity

vs Input Code

■

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

Compatible

Serial Interface

■

Schmitt Trigger On CLK Input Allows Direct

Optocoupler Interface

■

16-Pin Narrow SO Package

■

Industrial Process Control

■

Precision Industrial Equipment

■

Waveform Generation

■

Automatic Test Equipment

■

High Resolution Offset and Gain Adjustment

, LTC and LT are registered trademarks of Linear Technology Corporation.

MICROWIRE is a trademark of National Semiconductor Corporation.

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

Summary of content (12 pages)

PAGE 1
LTC1650 Low Glitch 16-Bit Voltage Output DAC U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 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.
PAGE 2
LTC1650 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW AVDD, DVDD to DGND .............................. – 0.5V to 7.5V TTL Input Voltage .................................... – 0.5V to 7.5V VOUT, VRST ................................ – 0.5V to (AVDD + 0.5V) AVSS .........................................................0.5V to – 7.5V Operating Temperature Range LTC1650C .............................................. 0°C to 70°C LTC1650I .............................
PAGE 3
LTC1650 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. AVDD = 4.75V to 5.25V, AVSS = – 4.75V to – 5.25V, DVDD = 4.75V to 5.25V, REFLO = 0V, REFHI = 4.096V, VOUT unloaded, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply Characteristics AVDD Positive Supply Voltage ● 4.75 5.0 5.25 V DVDD Positive Supply Voltage ● 4.75 5.0 5.
PAGE 4
LTC1650 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. AVDD = 4.75V to 5.25V, AVSS = – 4.75V to – 5.25V, DVDD = 4.75V to 5.25V, REFLO = 0V, REFHI = 4.096V, VOUT unloaded, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 0.
PAGE 5
LTC1650 U W TYPICAL PERFOR A CE CHARACTERISTICS Differential Nonlinearity (DNL) vs Input Code 5 1.0 4 0.8 3 0.6 2 0.4 DNL ERROR (LSB) INL ERROR (LSB) Integral Nonlinearity (INL) vs Input Code 1 0 –1 –2 CS/LD 5V/DIV 4.096V 0.2 VOUT 1V/DIV 0 –0.2 –0.4 –3 –0.6 –4 –0.8 –5 Large Signal Settling Time 0V –1.
PAGE 6
LTC1650 U W TYPICAL PERFOR A CE CHARACTERISTICS AVSS Supply Current vs Temperature DVDD Supply Current vs Temperature –4.5 Offset Error vs Temperature 0 25 –4.6 –4.8 –4.9 –5.0 –5.1 –5.2 OFFSET ERROR (LSB) 20 SUPPLY CURRENT (µA) SUPPLY CURRENT (mA) –4.7 15 10 –0.5 –1.0 –1.5 –5.3 5 –5.4 –5.
PAGE 7
LTC1650 U U U PI FU CTIO S CS/LD (Pin 8): The TTL Level Input for the Serial Interface Enable and Load Control. When CS/LD is low, the CLK signal is enabled so the data can be clocked in. When CS/LD is pulled high, data is loaded from the shift register into the DAC register, updating the DAC output. REFLO F/REFLO S (Pins 12, 13): The Force and Sense Pin for the Lower Reference Input. This should nominally be tied to ground. This pin can swing from – 1V to 1V.
PAGE 8
LTC1650 U U DEFINITIONS Resolution (n) Differential Nonlinearity (DNL) Resolution is defined as the number of digital input bits, n. It defines the number of DAC output states (2n) that divide the full-scale range. The resolution does not imply linearity. DNL is the difference between the measured change and the ideal 1LSB change between any two adjacent codes.
PAGE 9
LTC1650 U OPERATIO Serial Interface The data on the DIN input is loaded into the shift register on the rising edge of the clock. Data is loaded as one 16-bit word, MSB first. The DAC register loads the data from the shift register when CS/LD is pulled high. The clock is disabled internally when CS/LD is high. Note: CLK must be low before CS/LD is pulled low to avoid an extra internal clock pulse. The buffered output of the 16-bit shift register is available on the DOUT pin which swings from DGND to DVDD.
PAGE 10
LTC1650 U TYPICAL APPLICATIO 16-Bit Industrial Process Controller 6V TO 30V 5V IN LT1019-4.5 0.1µF 5V 0.1µF 4.5V REFHI AVDD DVDD UNI/BIP CLK DIN CS/LD µP LTC1650 VOUT CLR CONTROL VOLTAGE 0V TO 4.5V (69µV/LSB) RSTOUT DOUT REFLO F/S DGND AVSS VRST –5V 0.
PAGE 11
LTC1650 U PACKAGE DESCRIPTION N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.770* (19.558) MAX 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 0.255 ± 0.015* (6.477 ± 0.381) 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) 0.020 (0.508) MIN 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 0.045 – 0.065 (1.143 – 1.651) ) 0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 (2.
PAGE 12
LTC1650 U TYPICAL APPLICATIO A ±10V Bipolar Output 16-Bit DAC 5V 0.1µF 5V 0.1µF BIPOLAR OUT IN UNIPOLAR IN DVDD AVDD UNI/BIP REFHI 15V LT1019-4.5 CLK DIN 15V CS/LD µP VOUT LTC1650 CLR RSTOUT + LT1468 – REFLO DGND AVSS VRST –15V 110k –5V 0.1µF 0V TO 10V (UNIPOLAR MODE) –10V TO 10V (BIPOLAR MODE) 90k 10pF 1650 TA04 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1257 Single 12-Bit VOUT DAC, Full Scale: 2.048V, VCC: 4.75V to 15.